Jurnal Inovasi Teknologi Terapan

Apparent Source-Level Efficiency of Internal Electric and External LPG Heating in a Laboratory Vacuum Evaporator

2026-08-04T16:10:03+07:00

Background: Vacuum evaporation lowers boiling temperature, but performance depends on heat-source power and location, vacuum level, auxiliary demand, and the analytical boundary. This study compared an internally coupled electric resistance heater with an external LPG burner in the same laboratory vacuum evaporator using one non-replicated Water Boiling Test per configuration and 40 kg of water. Temperature, gauge pressure, water mass, reservoir temperature, and electrical variables were recorded every minute. The electric run lasted 367 min at 0.548 kW average source power; the LPG run lasted 300 min, consumed 0.80 kg fuel, and averaged 2.049 kW. LPG reached 65 °C at 35 min and evaporated 7.8 kg (0.0260 kg/min), whereas the electric heater reached 55 °C near the end and evaporated 2.4 kg (0.00654 kg/min). Apparent source-level efficiencies from a common sensible-plus-latent balance were 78.2% for electricity and 62.7% for LPG. A ±1 °C sensitivity changed these estimates by about ±1.39 and ±0.45 percentage points, respectively. Including vacuum-pump electricity reversed the system-level ordering. Because power, pressure, duration, and endpoints were not matched, the results describe two operating states rather than a causal heater-location effect.

Assessment of Carbon Black Weight Fraction on the Shear Strength of Polyurethane Adhesive Joints

2026-07-24T15:16:04+07:00

Adhesive bonding has become one of the most widely used joining techniques in engineering due to its ability to provide uniform stress distribution, minimize structural weight, and avoid the thermal distortion during welding processes. This study examines the effect of carbon black weight fraction on the shear strength of aluminum single-lap joints bonded with polyurethane adhesive. Aluminum 6061 specimens were prepared following ASTM D1002 standards and were reinforced with carbon black at weight fractions of 0, 8, 16, and 24 wt%. Fourier Transform Infrared (FTIR) spectroscopy was conducted to identify any chemical interactions, and lap shear testing was performed using a Universal Testing Machine (UTM). The results indicated that increasing the weight fraction of carbon black enhanced the shear strength and gradually shifted the failure mode from adhesive failure to cohesive failure. The specimen containing 24 wt% of carbon black exhibited the highest shear strength of 2.81 MPa, with 88% of the failures occurring cohesively. FTIR analysis revealed that carbon black did not introduce any new functional groups but functioned as a physical reinforcing filler within the polyurethane matrix. Therefore, carbon black is an effective reinforcing material for improving the mechanical performance of polyurethane adhesive-bonded aluminum single-lap joints.

Impact of Palm Frond Particle Size on the Characteristics of Biodegradable Particleboard

2026-07-24T15:09:59+07:00

Particleboard is a composite material based on lignocellulose that can be produced from agricultural waste, serving as an alternative to traditional wood products. This study utilized waste from oil palm fronds and empty fruit bunches as raw materials for the production of particleboard. The oil palm fronds were processed into filler particles of varying sizes: 80-mesh, 60-mesh, and 35-mesh. The composition of the raw materials included 50% oil palm frond particles, 15% empty fruit bunch fiber, 20% PVAc adhesive, and 15% epoxy resin. The particleboard was manufactured using a single-punch cold-press process at a pressure of 0.30 MPa for 120 minutes, followed by curing at 150°C for 60 minutes. Various characteristics of the particleboard were tested, including density, water content, thickness swelling, modulus of rupture (MOR), and modulus of elasticity (MOE). The results indicated that the particle size of 80-mesh yielded the best properties, with a density of 0.88 g/cm³, a water content of 5.51.6%, thickness swelling of 1.13%, a MOR of 19.79 MPa, and a MOE of 1.08 GPa. All specimens met the standards set by SNI 03-2105-2006 for density, water content, thickness swelling, and MOR; however, the MOE value did not meet the required standards.

Kelayakan Komposit rPET-Aerosil Sebagai Filamen 3D: Studi Eksperimental Terhadap Sifat Mekanik

2025-12-03T08:52:36+07:00

This study evaluated the feasibility of aerosil-reinforced recycled PET (rPET) plastic composite as a filament raw material for 3D printing. Experiments were conducted by varying the aerosil concentration to analyze its effect on mechanical properties based on tensile tests (ASTM D638) and impact tests (ASTM D256). The results showed that the addition of 3 g of aerosil resulted in the highest tensile strength of 10.3 MPa, while the optimal elastic modulus was achieved at the addition of 1.5 g (1993 MPa). Although the overall tensile and elongation properties were still below the standard for commercial PETG filaments, the material's impact toughness actually increased. The addition of 2.25 g of aerosil resulted in the highest impact strength of 145 J/m², which exceeds the standard PETG. It was concluded that the rPET-aerosil composite is worthy of consideration as an environmentally friendly alternative filament, especially for applications that prioritize impact resistance, with the optimum aerosil composition ranging from 2.25-3 grams.

Analisis Perlakuan Asap Cair Pada Serat Ampas Batang Sagu (Metroxylon Sago) terhadap Morfologi Dan Kekuatan Tarik Serat Tunggal

2026-07-31T07:43:04+07:00

Metroxylon sago is a palm that grows widely in tropical wetlands and has high economic and ecological value. The sago stem pulp waste contains cellulose fibers that have potential as reinforcement in composite materials. However, the hydrophilic nature and surface impurities of natural fibers limit their mechanical performance. Therefore, this study aims to analyze the effect of liquid smoke treatment on the morphology and tensile strength of single fibers from sago stem pulp. This study used an experimental method. The fibers were soaked in coconut shell liquid smoke for 1, 2, and 3 hours, followed by drying in an oven at 40°C for 30 minutes. Morphological observations were performed using a JEOL JCM 6000 Scanning Electron Microscope, and single fiber tensile tests were conducted according to ASTM D3379-02 standard. The results were compared with untreated fibers as control. The results showed that liquid smoke treatment altered the fiber morphology in all treatment variations. The most optimal surface morphology was obtained at 1 hour of treatment, characterized by a cleaner and rougher surface due to the removal of hemicellulose and impurities. In terms of mechanical properties, liquid smoke treatment increased the tensile strength of single fibers. The highest tensile strength was achieved at 1 hour of treatment with a value of 49.232 MPa, while the lowest was at 2 hours of treatment with 16.694 MPa. Prolonged soaking beyond 1 hour caused fiber degradation and a decrease in tensile strength. It can be concluded that 1 hour of liquid smoke treatment is the optimum duration to improve the morphology and tensile strength of single sago stem pulp fibers. This treatment can be used as an environmentally friendly alternative to enhance the quality of natural fibers for composite reinforcement applications.

Pembuatan Komposit Matrik Resin Fenolik Di Perkuat Paduan Logam Dan Bagasse Ash Menggunakan Metode Metalurgi Serbuk

2025-12-03T08:51:49+07:00

This study aims to develop phenolic resin-based composite materials with the addition of aluminum, brass, silica, and bagasse ash powders as reinforcing materials, using powder metallurgy methods. The specimen manufacturing process was carried out through mixing stages using a ball mill, hot compaction with pressure variations of 5000 psi, 53 00 psi, and 5600 psi, and sintering at a temperature of 130°C for 10 minutes. The tests were conducted at the Mechanical Engineering Laboratory of the Bangka Belitung State Polytechnic, including hardness tests (ASTM E110-14) and density tests (ASTM B962-17). The results showed that the pressing pressure and composition variations had a significant effect on the mechanical properties of the composite. The highest hardness value was obtained at a composition of 35% with a pressure of 5600 psi, while the optimal density was obtained at a composition of 31% with a pressure of 5300 psi. Overall, the combination of the right process parameters proved to be able to improve the quality of the composite, so that this material has the potential to be used as an alternative to asbestos-based brake pads.

Rancang Bangun Alat Perajang Singkong Dengan Pisau Horizontal Menggunakan Pendorong Pegas

2026-07-24T15:08:12+07:00

Cassava (Manihot esculenta Crantz), also known as tapioca or cassava, is one of the main tuber crops cultivated in humid tropical regions. In addition to being a staple food source, cassava is also used to produce tapioca flour and cassava chips through a shredding process. Cassava shredding can be done manually with traditional tools or made easier by using technology in the form of a shredding machine. However, the use of shredding machines still faces obstacles such as relatively long time and uneven shredded results. This machine is designed to increase the quantity and quality of shredded results. Horizontal knives and spring-shaped pushers are used in the machine. The way this machine works is by rotating the blade using a 125 watt electric motor, using 2 blades and machine dimensions of 60 cm long x 30 cm wide x 40 cm high. The results of this study were carried out 3 times, obtaining an average yield of 886 grams and an average time of 80.41 seconds with a production capacity of 40.636 kg / hour and a production efficiency of 88.6%.

Kekuatan Bending Rangka H-Beam Komposit Sandwich Menggunakan Core Polimer Produk 3D Printing dan Skin Serat Karbon

2026-07-24T15:23:30+07:00

Additive manufacturing (AM) has emerged as an effective fabrication approach for producing lightweight structural components with high geometric flexibility; however, its relatively limited mechanical performance restricts its direct application in load-bearing structures. In contrast, carbon fiber-reinforced composite structures offer superior stiffness-to-weight and strength-to-weight characteristics, but conventional composite manufacturing processes are often labor-intensive, time-consuming, and less adaptable to complex structural profiles. To address these limitations, this study proposes an integrated fabrication strategy for composite H-beam structures that combines the design flexibility of fused deposition modeling (FDM) with the mechanical efficiency of carbon fiber reinforcement. The proposed method utilizes FDM to fabricate H-beam cores using PLA+ and ABS materials, which are subsequently reinforced with carbon twill fabric and carbon prepreg layers through a vacuum bagging process. A controlled curing process is conducted at 70 °C for 240 min to improve composite consolidation and achieve optimal mechanical performance. The effects of material selection and reinforcement configuration are evaluated through bending tests to assess structural strength and rigidity. The results demonstrate that integrating 3D printing with vacuum-assisted composite fabrication enables the production of lightweight H-beam structures with enhanced mechanical performance and improved manufacturing flexibility compared with conventional approaches.

Modifikasi Sistem Buka-Tutup Dan Struktur Tulangan Kap Mesin Purwarupa Kendaraan Listrik

2026-07-30T15:16:52+07:00

The engine hood of the prototype electric vehicle, developed in a previous study, still uses a permanent mounting system, which limits access for inspection and maintenance of the vehicle’s front compartment. This study aims to implement an opening-closing system and a reinforcement structure for the hood using 1 mm-thick Steel Plate Cold Commercial (SPCC). The research was conducted through the following stages: design using SolidWorks 2022; fabrication of the hood panel and reinforcement structure; assembly of the opening-closing mechanism components; and evaluation of the implementation results. The opening-closing mechanism consists of a hood hinge, a hood latch, and a hood support rod, while the reinforcement structure was fabricated using a 25 × 25 × 2 mm hollow square profile. The results of the study indicate that the opening-closing system and the reinforcement structure were successfully implemented according to the design, forming a single structural unit with the hood panel. The reinforcement structure serves to strengthen the panel while also acting as a mounting bracket for the hood hinge and hood latch, whereas the implementation of the opening-closing system improves ease of access to the vehicle’s front compartment for inspection and maintenance compared to the previous design, which used a permanent mounting system. Furthermore, the development of the hood enhances functionality without altering the primary dimensions or the basic concept of the front body of the prototype car.

Pengaruh Putaran Terhadap Hasil Pengepresan Kaleng Aluminium Bekas

2026-07-27T17:39:56+07:00

One of the factors influencing the performance of the can-pressing machine is the motor speed. This study aimed to determine the effect of machine rotational speed variations on the final height of compressed aluminum cans and the pressing time required. The experiments were conducted using a can-pressing machine powered by a 1 HP electric motor with rotational speed variations of 1200 rpm, 1300 rpm, and 1400 rpm. Each rotational speed was tested in three trials using 10 used aluminum cans as test specimens. The observed parameters were the final height of the cans after pressing and the time required for the pressing process. The results showed that the machine rotational speed significantly affected both the compression height and the pressing time. At 1200 rpm, the average final can height was 18.87 mm with an average pressing time of 36.67 seconds. At 1300 rpm, the average final can height decreased to 17.47 mm with an average pressing time of 20.67 seconds. Meanwhile, at 1400 rpm, the average final can height was 17.02 mm with an average pressing time of 16.67 seconds. These findings indicate that increasing the machine rotational speed results in a lower final can height and a shorter pressing time. Compared with the manual pressing method, which produced a final can height of approximately 30 mm and required about 70 seconds, the machine-assisted pressing process proved to be more effective and efficient. Based on the results of this study, it can be concluded that a rotational speed of 1400 rpm is the optimal operating condition, as it produced the smallest final can height and the shortest pressing time. Therefore, increasing the machine rotational speed within the tested range can improve the quality of the compression results and enhance the efficiency of the used aluminum can pressing process.

Rancang Bangun Aplikasi Web Pojok Literasi Statistik Sebagai Media Litarasi Statistik Di BPS Provinsi Kepulauan Bangka Belitung

2025-12-03T01:15:48+07:00

The high number of students or university students as users of statistical data recorded by the Central Statistics Agency (BPS) is not matched by adequate understanding. These data are widely processed and used as a basis for research. Although data information is widely available, many people still cannot understand and utilize the data effectively. In today's digital era, it is imperative for BPS to undergo digital transformation, especially in terms of disseminating statistical products to remain relevant to the times. The purpose of this study is to design and develop a digital innovation in the form of a website-based statistical literacy media application to improve statistical literacy and the dissemination of statistical products. The methods in this research consist of five stages, namely collection and analysis of requirements, prototyping, prototyping evaluation, coding, testing, and system evaluation. The results of the research in the form of system testing using blackbox testing show that the application with main features such as educational content, interactive tools, monthly quizzes and challenges, as well as internship and research programs for students is running and functioning as expected.

Analisis Sifat Termal Dan Kuat Impak Green-Sandwich Composite Berdasarkan Variasi Susunan Lapisan (Stacking Sequence)

2026-08-04T06:42:08+07:00

The use of environmentally friendly composite materials has been increasingly developed as an alternative to conventional materials for automotive components. This study aimed to investigate the effect of stacking sequence variations on the thermal insulation performance and impact strength of Green Sandwich Composites reinforced with coconut coir fiber, woven fiberglass, a balsa wood core, and polyester resin. The specimens were fabricated using the hand lay-up method combined with vacuum bagging, followed by thermal insulation and Charpy impact testing. The data were analyzed using One-Way ANOVA. The results showed that the GF–NF–C–NF–GF configuration exhibited the best performance, achieving a thermal insulation efficiency of 40.65% and an impact strength of 198.98 kJ/m². However, the One-Way ANOVA results indicated that stacking sequence variations had no statistically significant effect on either parameter at a 5% significance level. Nevertheless, the GF–NF–C–NF–GF configuration is recommended as the optimum stacking sequence because it provides the best combination of thermal and mechanical performance for environmentally friendly automotive bumper applications.

Prediksi Harga Pangan di Kota Pangkalpinang Menggunakan Algoritma XGBoost

2025-12-23T09:55:49+07:00

Food price fluctuations are a strategic issue affecting food security and regional inflation stability. Pangkalpinang City experiences significant inflationary pressure in the food sector, highlighting the need for accurate predictive models. This study aims to develop a time series–based price prediction model for strategic food commodities using the Extreme Gradient Boosting (XGBoost) algorithm. The dataset consists of daily prices of 40 food commodities obtained from the Pangkalpinang City Trade Information System, covering the period from January 1, 2024, to May 28, 2025. The research methodology includes data preprocessing, feature engineering, time series–based data splitting, hyperparameter optimization using Optuna, and model evaluation. Feature engineering incorporates price lag features, statistical features, calendar features, and national holiday indicators. Model performance is evaluated using Mean Absolute Percentage Error (MAPE), Root Mean Square Error (RMSE), and the R-Squared (R²). The results indicate that XGBoost achieves high prediction accuracy for most commodities, particularly those with stable price patterns, while still capturing fluctuation trends in highly volatile commodities. The findings suggest that commodity-specific modeling provides better performance than a single global model and can support regional inflation control policies.

Rancang Bangun Jig and Fixture Pembengkok Pipa Baja ST37 untuk Rangka Kursi Kelas

2026-07-28T13:20:35+07:00

Designing a pipe bending jig and fixture by applying the stages of the VDI 2222 method, so that a design suitable for the production process of class chairs is obtained. At this stage, written data regarding the bending of ST37 pipes and research results using the VDI 2222 research method are collected from reputable sources such as journals, books, research reports, scientific papers, and articles. From the bending results, it can be concluded that the ST37 pipe responds quite well when bent using this tool, producing good bends and only experiencing slight ovalization compared to other pipes. Therefore, this 1.4 mm diameter ST37 pipe becomes the best product choice compared to other ½-inch pipes. Based on the analysis of the tool I designed and built, it can be concluded that the tool using the VDI 2222 method is capable of bending ST37 pipe with a diameter of 1.4 mm shows quite good bending results, only experiencing slight ovalization.

Pengaruh Panjang Serat Pelepah Kelapa Sawit dan Persentase Serbuk Cangkang Telur terhadap Kekuatan Impak Komposit Bermatriks Polyester

2026-08-04T06:40:02+07:00

Utilising oil palm frond fibre and eggshell powder provides an opportunity to convert plantation and food waste into functional composite constituents. This study examined the effects of fibre length and eggshell-powder content on the Charpy impact strength of a polyester-matrix composite. A 3 × 3 full-factorial design was applied using fibre lengths of 60, 70, and 80 mm and eggshell-powder contents of 3, 6, and 9 wt.%. Three specimens were prepared for each combination by hand lay-up, giving 27 specimens, and were tested with reference to ISO 179-1. The highest mean impact strength was 50.72 kJ/m² for the 80 mm–9% combination, whereas the lowest was 15.52 kJ/m² for the 80 mm–6% combination. Two-way ANOVA indicated significant effects of fibre length, eggshell-powder content, and their interaction (p < 0.001). The interaction confirms that a longer fibre does not automatically improve impact strength unless it is accompanied by an appropriate filler content. The investigated composite is therefore positioned as an initial candidate for car bumper components.

Aplikasi Hallotem Platform Konsultasi Dan Layanan Pengaduan Teknisi Elektro Medis Berbasis Mobile

2025-12-10T01:05:18+07:00

The advancement of information and communication technology has driven digital transformation across various sectors, including healthcare. RSUD Dr. Ir. H. Ibnu Saleh, MM, in Bangka Belitung faces challenges in managing medical equipment due to a limited number of technicians and a manual reporting system for equipment malfunctions. This leads to delays in repairs and impacts the quality of healthcare services. This study aims to design and develop the HalloTEM mobile application using the Prototipe method to address these issues. The application enables real-time reporting of medical equipment malfunctions, direct consultation with technicians, and efficient management of complaint data by administrators. Developed using the Flutter framework and supported by Laravel and MySQL technologies, the application offers features such as real-time notifications via WhatsApp or in-app, complaint status tracking, and periodic reporting. The results demonstrate that HalloTEM significantly improves efficiency, accuracy, and documentation in the medical equipment repair process, thereby enhancing the overall quality of healthcare services in the hospital.

Analisis Hubungan Getaran dan Kualitas Kebulatan Pada Proses Pembubutan Baja ST60

2026-01-05T14:38:54+07:00

This study aims to analyze the relationship between machine vibration and roundness quality in the turning process of ST 60 steel. An experimental method was conducted by varying three main cutting parameters: depth of cut (2 mm and 3 mm), spindle speed (700 RPM and 995 RPM), and feed rate (0.7 mm/rev and 1 mm/rev). Vibration was measured using a vibrameter (VibraPort 80), while roundness quality/surface roughness (Ra) was measured using a micrometer and a surface roughness tester. The results indicated that the increase in vibration intensity is directly proportional to the increase in surface roughness/roundness values, with vibration acting as a mediator that degrades the quality of the turning results. Feed rate was identified as the most dominant parameter affecting both vibration and roundness quality. Increasing the feed rate from 0.7 to 1 mm/rev expanded the tool path markers, resulting in a coarser surface. Conversely, higher spindle speeds tended to produce a more stable cutting process and dampen vibrations, although extreme RPMs could trigger chatter. The conclusion shows that vibration control through parameter optimization, particularly the use of low feed rates and stable high RPMs, is crucial for achieving precision in ST 60 steel turning with an optimal Ra value below 1.5 μm.

Pembuatan Website Untuk Sistem Keamanan Loker Dengan Fingerprint ID dan RFID Berbasis Website

2025-12-23T09:52:43+07:00

Lockers commonly used in daily life, both in public and private spaces, are generally still conventional and rely on metal keys for security. However, physical keys often cause problems such as being lost or misplaced. With the rapid advancement of technology, many devices can now be integrated with digital systems, including lockers frequently used by the public. Therefore, this project aims to develop a locker security system based on fingerprint and RFID technology integrated with a website, in order to enhance both security and user convenience. The system utilizes a fingerprint sensor for user authentication and RFID as an additional access card. The ESP32 microcontroller serves as the data processor and transmits information to the website. The website is developed using PHP as the main backend language and Bootstrap as the frontend framework to create a responsive and visually appealing interface. The development process applies the waterfall model, consisting of requirement analysis, design, implementation, and testing stages. Testing is carried out using the black-box method. The test results show that the system successfully improves security and convenience through dual-layer protection using fingerprint and RFID. In addition, the integrated website allows administrators and users to monitor user data and locker usage history efficiently.

Pengaruh Kecepatan Pemotongan, Feed Rate Dan Depth Of Cuth Terhadap Kekasaran Permukaan Pada Benda Kerja Material S45C Pada Proses CNC Milling

2025-12-23T09:40:13+07:00

Surface quality is an important aspect in machining processes because it affects the performance and service life of components. S45C steel is widely used in the automotive and manufacturing industries, thus optimization of cutting parameters is required to obtain the best surface quality. Each machining parameter has a different level of influence on machining results. Therefore, this study was conducted to analyze the effects of cutting speed, feed rate, and depth of cut on surface roughness as well as to determine the optimum parameter combination in the CNC milling of S45C steel. The Response Surface Methodology (RSM) with a Box–Behnken design was used to develop the experimental plan consisting of 15 combinations. Surface roughness measurements were carried out using a Mitutoyo SJ-210. Analysis of variance (ANOVA) showed that depth of cut significantly affected surface roughness with a P-value < 0.05, while cutting speed and feed rate did not exhibit a statistically significant effect. The developed second-order regression model resulted in a saddle point characteristic, indicating that the optimum value was not located at either the lower or upper limit of the parameters. The optimization results indicate optimum conditions at a cutting speed of 82.85 m/min, feed rate of 298 mm/min, and depth of cut of 0.87 mm with a predicted surface roughness of 2.56 µm. These findings can serve as a reference for setting machining parameters to improve the surface quality of S45C steel.

Kelayakan Komposit Rpet -Karbon Aktif Sebagai Filamen 3D Studi Eksperimental Terhadap Sifat Mekanik

2025-12-03T02:31:40+07:00

The accumulation of plastic waste, particularly polyethylene terephalate (PET), has become a serious environmental issue due to its widespread use and long degradation period. Although recycling PET waste offers environmental and economic benefits, its limited mechanical properties restrict its potential application in advanced manufacturing such as 3D printing. Previous studies have shown that reinforcement with carbon-based fillers can improve the performance of recycled PET;however, research on the mechanical characterization of recycled PET composites reinforced with activated carbon remains limited. This study aims to examine the feasibility of polymer composites made from recycled PET reinforced with activated carbon as a raw material for 3D filament production. Recycled PET was mixed with various amounts of activated carbon and mechanically tested according to ASTM D638 (tensile test) and ASTM D256 (impact test). The results showed that the addition of activated carbon affected the tensile strength, elastic modulus, and impact toughness. The optimum composition was obtained at 2.25 g of activated carbon, which provided the best impact resistance. However, the low elongation indicated brittle behavior, suggesting that further modification is required. This study provides an alternative approach for utilizing recycled PET plastic waste as a sustainable and functional material for 3D printing filament

Implementasi Sistem Hybrid Verifikasi Kehadiran Berbasis Embedded untuk Monitoring Distribusi MBG

2026-08-10T10:04:32+07:00

Attendance-data validity was essential to support accurate distribution of the Free Nutritious Meals Program. This study designed and implemented a Raspberry Pi 4-based hybrid attendance-verification system with selectable facial and fingerprint recognition. Experimental engineering was applied through device design, dataset preparation, software integration, and subsystem and integrated-system testing. Facial recognition used YOLOv5n as a trigger, MediaPipe for face detection, MobileFaceNet for embedding extraction, and cosine similarity for identity matching. The dataset produced 1,172 valid embeddings from 30 students. Testing achieved 100% fingerprint success, 100% face-detection success, and 94.7% facial-recognition accuracy. All five storage and web-dashboard functions operated as designed. The system supported local, automatic, and integrated attendance recording; however, facial-recognition performance decreased under low illumination.

Uji Coba Sistem Pneumatik pada Hand Trainer Berbahan TPU untuk Meningkatkan Fungsi Motorik Tangan Pasien Strok

2026-01-05T14:50:21+07:00

This study focuses on designing and testing a Pneumatic Hand Trainer using 3D printing technology to support hand rehabilitation for post-stroke patients. The device employs a soft actuator made of Thermoplastic Polyurethane (TPU) driven by compressed air through a pneumatic system. The experimental process included design using SolidWorks, 3D printing fabrication, assembly, and performance testing. The results showed that the device operated effectively at a pressure range of 0.39–0.45 MPa, with an average of 0.4 MPa, providing stable and responsive motion during grip and release movements. Minor pressure variations were within acceptable limits, influenced by air supply and material elasticity. Overall, the system is efficient, safe, and capable of simulating natural finger motion, indicating its potential as a cost-effective rehabilitation tool based on additive manufacturing and pneumatic actuation.

Rancang Bangun Jig and Fixture Pembengkok Pipa Baja Untuk Pembuatan Rangka Meja Kelas

2026-07-28T13:18:41+07:00

The process of bending steel pipes in making classroom table frames in many workshops is still carried out manually, resulting in less precise bending angles, inconsistent product quality, and low work efficiency. This study aims to design and make a jig and fixture for bending steel pipes as a tool to assist in the classroom table frame manufacturing process by applying the VDI 2222 method. The research stages include literature review, needs analysis, concept design, selection of design alternatives, making the tool, and testing the tool's performance. The testing was conducted on several types of steel pipes, namely galvanized pipes with thicknesses of 0.9 mm and 1.7 mm, as well as ST37 pipes with thicknesses of 1.4 mm and 1.7 mm. The results show that the designed jig and fixture can bend steel pipes up to a 90° angle while keeping the pipe stable during the bending process. The material and thickness of the pipe affect the quality of the bending results, where the thicker the pipe, the greater the force required and the higher the potential for wrinkles to form on the inside of the bend. A 1.4 mm thick ST37 steel pipe produces bending quality that is most suitable for making classroom table frames. Overall, the designed tool has fulfilled its function as a steel pipe bending aid, although further development is still needed on the forming and holding system to reduce bending defects and lower the operating force.

Inovasi Administrasi Kehadiran Santri di TPA: Solusi Cerdas dengan Teknologi Sidik Jari dan Firebase

2026-01-01T14:40:24+07:00

Student attendance administration is a crucial process at Al-Quran Education Parks (TPA). In reality, many TPAs still conduct manual administration, as in the three TPAs surveyed in Bangka, making them vulnerable to data loss, inaccurate recording, and slow processing. The solution is to design an intelligent, integrated website attendance system using fingerprint sensors, ESP 8266, and Firebase. The collaboration between biometric technology and Firebase is expected to replace manual administration, improve discipline and accuracy of student attendance data, and increase efficiency. The results demonstrate the system's effectiveness in supporting the attendance process.

Analisis Risiko Kegagalan Mesin Thresher Menggunakan Metode Failure Mode and Effect Analysis (FMEA) dan Risk Priority Number (RPN) di Pabrik Kelapa Sawit PT. MAS

2026-01-14T02:51:35+07:00

The thresher machine plays a critical role in separating palm fruits from bunches in palm oil mills. Failures in the thresher machine can lead to increased downtime, production losses, and reduced Crude Palm Oil (CPO) output. This study aims to identify potential failure modes of the thresher machine and determine the most critical components using Failure Mode and Effect Analysis (FMEA) and Risk Priority Number (RPN). This research employs a quantitative descriptive approach with a case study conducted at PT. MAS Palm Oil Mill from January to December 2024. Data were collected through field observations, structured interviews, and operational record analysis. The results show that the thresher machine operated for 5,384 hours with a total downtime of 37 hours due to 11 failure events. Based on the RPN calculation, the V-belt has the highest risk level with an RPN value of 128, followed by the spider component with an RPN value of 126. These components are identified as critical and should be prioritized in maintenance planning. The implementation of FMEA and RPN can support effective maintenance decision-making, reduce downtime, and improve the reliability of the thresher machine.

Analisis Pengaruh Parameter Pemesinan CNC Milling terhadap Material Removal Rate pada Dudukan Cetakan Kampas Rem

2026-01-05T08:29:31+07:00

This study investigates the influence of CNC Milling parameter variations on the Material Removal Rate (MRR) of S45C steel brake lining mold holders using the Taguchi method. Three parameters—spindle speed, feed rate, and depth of cut—were tested at three levels through an L9 experimental design. Data were analyzed using the signal-to-noise ratio, ANOVA, and normality testing. Results indicate that none of the parameters significantly affect MRR at the 5% level (Fcount < Ftable = 19.00). Depth of cut showed the highest relative contribution (7.39%), while spindle speed and feed rate contributed negatively. A high error value (92.99%) suggests unobserved external factors. The optimal combination is 2388 rpm, 191 mm/min, and 2.67 mm, yielding a predicted MRR of 90.0766 (CI ±0.4126). Normality assumptions were met (p > 0.150).

Analisis Jenis Kerusakan Alat Berdasarkan Diagram Pareto

2025-12-23T09:45:44+07:00

Offshore tin mining operations rely heavily on the performance of Production Suction Dredgers as the main production units. The reliability of mechanical production equipment plays a crucial role in maintaining operational continuity and achieving production targets. Recurrent equipment failures can lead to increased downtime, reduced operating hours, and decreased vessel productivity. This study aims to analyze the most dominant types of mechanical equipment failures on KIP Timah 07 using the Pareto Diagram as a basis for determining maintenance priorities. The research method employed is descriptive quantitative with a case study approach. The analyzed data consist of secondary data obtained from daily logsheets, technician work reports, machine operating hour records, and downtime reports during the observation period. Failure data were classified based on failure types, and their frequency, percentage, and cumulative percentage were calculated and presented using a Pareto Diagram. The results indicate that gearbox failure is the most dominant type of failure, contributing 58.88% of the total failure occurrences. In addition, failures in the soil pump bearing block and cutter hydraulic pump also contribute significantly, resulting in a cumulative contribution of 79.44%. Based on these findings, maintenance activities should be prioritized on the dominant components to reduce downtime and improve the reliability and operational productivity of KIP Timah 07.

Monitoring Alat Ukur Kecepatan Arus Air Laut Berbasis Internet of Things (IoT)

2025-12-23T09:51:15+07:00

Abstract

This final study focuses on the development of a sea current speed measuring device designed using Internet of Things (IoT) technology, allowing it to be monitored in real-time via mobile devices. The system integrates several core components, including the ESP32 microcontroller, the LM393 infrared speed sensor, and a disk encoder. It utilizes MIT App Inventor as the interface between the device and the user. The sea current speed data is displayed in RPM and cm/s units, both on an LCD screen and within an Android application. Device testing was conducted over three consecutive days at three different locations to evaluate system performance under real-world environmental conditions. The results showed that the system was capable of delivering accurate data readings, with an average accuracy rate of 93,09%. With these capabilities, the system is expected to provide a practical, affordable, and efficient solution for monitoring sea current speeds, particularly for fishermen and other users who require direct and continuous oceanographic data

Prototype Smart Charging Untuk Sepeda Listrik Berbasis Internet of Things

2026-01-12T09:34:35+07:00

The increase in the use of electric bicycles has led to the need for an efficient and safe charging system. This study designed a prototype of a smart charging system for electric bicycles based on the Internet of Things (IoT) to facilitate real-time and remote monitoring of charging. This system uses an ESP32 microcontroller, a 24V 15A power supply, 400W and 1200W step-up converters, and ACS712 30A voltage and current sensors. Charging data is displayed through the Blynk application to facilitate user monitoring. Test results show that the voltage increases until it stabilizes, while the current decreases over time during charging, indicating that the system works safely and efficiently (voltage 45–57 V, current approximately 2 A to nearly 0 A, time 0 to 353 minutes). Electricity consumption increases at the start of charging and then decreases, while charging costs continue to accumulate, indicating that the system is capable of calculating energy and estimating costs in real-time (maximum energy approximately 0.0018 kWh, cost approximately Rp1,200–Rp1,300).

Analisis Perbandingan Pengaruh Media Pendingin Dromus dan Air Radiator Terhadap Kekasaran Permukaan Baja S45C Pada Proses CNC Miliing

2026-01-05T15:02:45+07:00

This study aims to analyze the comparative effect of Dromus and radiator water cooling media on the surface roughness of S45C steel in the CNC Milling machining process. The quality of the machined surface is a critical indicator in the manufacturing industry, necessitating parameter optimization to achieve maximum efficiency. The Taguchi method with an L9 orthogonal array experimental design was used to evaluate the influence of three process parameters: spindle speed, depth of cut, and feed rate. Tests were conducted with three replications for each combination, and data were analyzed using the Signal-to-Noise (S/N) ratio calculation with the "smaller-is-better" category and ANOVA to determine the contribution of each factor. The results showed that Dromus cooling media consistently provided lower and more stable surface roughness values compared to radiator water. The optimal parameter combination found was a spindle speed of 1910 rpm, a depth of cut of 0.2 mm, and a feed rate of 330 mm/min. Contribution analysis revealed that when using Dromus, the depth of cut was the most dominant factor (63.40%), whereas with radiator water, spindle speed was the primary factor influencing surface roughness (45.67%).

Peningkatan Keakurasian Produk Cetak 3D Printing Menggunakan Filamen PLA+

2025-12-03T02:30:04+07:00

This study aims to improve the dimensional accuracy of printed products in the 3D Printing process using the Fused Deposition Modeling (FDM) method with PLA+ filament material. The research employed the Taguchi L9 (3²) experimental design to evaluate the influence of printing speed and layer height on the dimensional precision of the printed objects. Cube-shaped specimens measuring 20×20 mm were fabricated using an Ender 3 Pro printer and measured with a digital caliper of 0.02 mm accuracy. The results showed that the combination of a 0.10 mm layer height and 85 mm/s print speed produced the highest accuracy, with a minimal dimensional deviation of approximately ±0.05 mm from the nominal size. The Signal-to-Noise (S/N) Ratio analysis indicated that both parameters contributed equally to print quality. Therefore, optimizing printing parameters and utilizing PLA+ material effectively enhances dimensional precision, process stability, and geometric quality of 3D printed products. These findings can serve as a practical guideline for optimizing additive manufacturing processes based on the FDM technique.

Analisis Aliran Cetakan Paving Block Menggunakan Material Polypropylene (PP)

2025-12-03T03:53:48+07:00

This study presents the design and flow analysis of a polypropylene (PP) injection mold for paving block production as a cost-efficient and lightweight alternative to conventional metal molds. The research consists of a field survey at Tacon company, product geometry evaluation, mold design using SolidWorks, and flow simulation to assess mold performance. Simulation results indicate that the two-plate mold with a 2 mm wall thickness can withstand loads up to two stacked paving blocks (40 N) without deformation. The filling time was recorded at 1.6491 seconds, with a maximum injection pressure of 49.03 MPa, and cooling time ranging between 5.14–10.64 seconds. The sink mark value was very small (0.0031 mm) and located in non-critical areas, while air traps appeared only at the cavity edges. These findings confirm that PP can be effectively used as a mold material for paving blocks, providing stable melt flow behavior, good product quality, and efficient cooling cycles. This research contributes to the development of polymer-based mold technology for affordable, lightweight, and locally manufacturable paving block production.

Analisis Hubungan Getaran dan Kekasaran Permukaan pada Proses Pembubutan Baja ST60

2026-01-01T14:35:01+07:00

This study aims to analyze the relationship between vibration and surface roughness in the turning process of ST 60 steel. The turning process was carried out by varying machining parameters, namely depth of cut, spindle speed, and feed rate. An experimental method was employed using eight combinations of cutting parameters. The material used was cylindrical ST 60 steel. Vibration measurements were performed using a VibraPort 80, while surface roughness measurements were conducted using a Mitutoyo SJ-210 surface roughness tester. The results show that workpiece number 1 produced the best surface quality with a surface roughness (Ra) value of 1.42 µm. In contrast, workpiece number 8 exhibited the poorest surface quality with an Ra value of 3.12 µm. The differences in surface quality were influenced by the combination of turning parameters that led to increased vibration during the cutting process. These results indicate that vibration plays an important role in determining the final surface quality. Therefore, proper control of turning parameters is required to minimize vibration and achieve optimal surface quality in the turning of ST 60 steel.

Analisa DFA Terhadap Rancangan Body Mesin Pencacah Plastik

2025-12-03T03:10:29+07:00

Efficient product design not only focuses on functionality and structural strength but also emphasizes the ease of the assembly process. This study aims to analyze the application of the Design for Assembly (DFA) method in the body design process of a product to achieve a more efficient and easily assembled structure. The DFA method is used to evaluate the number of components, assembly sequence, assembly time, and the level of difficulty in installing each component. The analysis compares several body design alternatives based on criteria such as manufacturability, ease of maintenance, and assembly efficiency. The results show that the application of DFA principles can reduce unnecessary components, minimize assembly time, and improve structural efficiency by more than 20%. Therefore, implementing the Design for Assembly concept at the design stage can produce a simpler, more economical, and easily assembled product body without compromising its strength or functionality.

Game Edukasi Berhitung Gorgon Adventure

2025-12-10T00:45:44+07:00

Gorgon Adventure is an interactive educational game designed to support third-grade elementary students in understanding basic arithmetic concepts. This application integrates gameplay elements with mathematics learning materials, creating an engaging learning experience capable of increasing students’ motivation and interest. The development process uses the Rapid Application Development (RAD) method, which emphasizes fast cycles of design, construction, and evaluation. Based on the results of testing, the application performs optimally, as demonstrated by black-box testing that verifies all features function properly. In terms of content validity, teacher assessment indicates a 100% score categorized as highly valid, while the User Acceptance Testing (UAT) achieved 84%, categorized as highly feasible. The effectiveness of the application is also reflected in the improvement of student learning outcomes, with the average score rising from 57.33 in the pretest to 89.33 in the post-test, showing a significant enhancement in basic arithmetic skills. With its attractive interface, interactive features, and strong testing results, Gorgon Adventure can serve as an innovative, effective, and enjoyable alternative learning media for elementary school students.

Analisa DFA Terhadap Rancangan Body Mesin Pencacah Plastik Kemasan 220ml Portable

2025-12-03T02:39:28+07:00

Complex problems in machine assembly processes are often caused by inefficient product designs, such as excessive component count and long assembly time. This study aims to analyze the application of the Design for Assembly (DFA) method to the design of a plastic shredder machine body to improve assembly efficiency and manufacturing ease. The research method includes component analysis, assembly feasibility evaluation using DFA parameters, and assembly efficiency index calculation based on the Boothroyd and Dewhurst approach. The analysis results show that the redesigned body using DFA reduced the number of components by 25% and decreased estimated assembly time by 32% compared to the initial design. Moreover, the assembly efficiency increased from 45% to 66%, indicating a simpler, more ergonomic, and cost-effective design. Thus, the DFA method proved effective in optimizing the design of the plastic shredder machine body, making it easier to assemble and manufacture without reducing its structural strength.

Analisis Intensitas Cahaya terhadap Voc dan Isc Panel Surya

2026-07-24T15:17:30+07:00

Due to Indonesia's year-round abundance of sunlight, solar energy is one of the renewable energy sources with substantial development potential. Photovoltaic panel output characteristics, particularly open circuit voltage (Voc) and short circuit current (Isc), are impacted by variations in solar irradiation. The purpose of this study is to examine how solar irradiation affects a 50 WP monocrystalline solar panel's Voc and Isc values. Direct measurements were made every five minutes between 10:00 and 11:30 in the morning as part of an experimental approach. Solar irradiance, open circuit voltage, and short circuit current were among the parameters that were measured. The results showed that increasing irradiance significantly affected the Isc value, while Voc tended to remain relatively stable. The highest irradiance value was 982 W/m² with a Voc value of 20.6 V and an Isc value of 3.21 A. The findings indicate that the output current of the photovoltaic panel is more sensitive to irradiance changes than the output voltage

Perancangan Tempat Sampah Pintar Berbasis IoT Pada Rumah Sakit Umum Sungailiat

2025-12-23T09:54:16+07:00

This study presents the implementation of an IoT-based smart waste bin designed for hospital environments to monitor waste capacity and detect hazardous medical waste (B3). Effective waste management in hospitals is critical to prevent contamination and ensure environmental safety. The proposed system integrates ultrasonic sensors to measure waste capacity and an MQ-135 gas sensor to detect hazardous gases, controlled by an ESP32 microcontroller. Waste status data are transmitted in real time to a mobile monitoring application via an IoT platform, enabling automatic notifications when waste reaches critical capacity levels. Experimental results show that the system can measure waste levels with an accuracy of ±2 cm and deliver notifications with an average latency below 2 seconds. The proposed system demonstrates potential to improve efficiency, safety, and responsiveness in hospital waste management.

Analisis Kompensasi Daya Reaktif terhadap Faktor Daya Motor Induksi Menggunakan Bank Kapasitor

2026-08-19T10:07:55+07:00

Induction motors are the most widely used electrical machines in industry and are classified as inductive loads that absorb significant reactive power, resulting in a low power factor. A low power factor increases line current, causes greater distribution losses, and may incur penalty charges from utility companies. This study experimentally analyzes the effect of a switchable capacitor bank on the power factor and line current of a three-phase slip-ring induction motor under three loading conditions (M = 1.6 Nm, 1.8 Nm, and 2 Nm) at a supply voltage of 380 V / 50 Hz. Eight capacitor bank switching levels ranging from 0 to 1,350 VAR were tested. The results show that the power factor improved significantly from 0.23–0.28 (no compensation) to 0.53–0.55 at the optimal level (1+2+3+4), while the line current decreased by up to 53% from 1.57–1.72 A to 0.73–0.82 A. The motor current remained unaffected by compensation, confirming that capacitive compensation only reduces reactive current on the supply side. Over-compensation was also observed when excessive capacitance was applied, causing the power factor to deteriorate. These findings confirm that proper capacitor bank sizing is critical and must match the reactive power demand at each load condition.

Analisis Kompensasi Daya Reaktif pada Motor Slip-Ring Tiga Fasa Dengan Beban 1,6 Nm dan 2,1 Nm

2026-08-19T10:05:23+07:00

Induction motors are widely used in industrial applications due to their favorable operating characteristics and ease of speed control. However, they exhibit a relatively low power factor caused by a high demand for inductive reactive power. This study aims to improve the power factor of a three-phase slip-ring induction motor through reactive power compensation using a capacitor bank. Tests were conducted at load conditions of 1.6 Nm and 2.1 Nm, utilizing a capacitor bank with eight activation levels and a total capacitance range of 0–30 μF. The results indicate that without compensation, the power factor was 0.29 and 0.33 for the respective load conditions. Optimal compensation was achieved using a combination of switches 2, 3, and 4 (total capacitance of 28 μF), which improved the power factor to 0.83 at a 1.6 Nm load and 0.89 at a 2.1 Nm load, while simultaneously reducing the line current to near-minimum values. Conversely, activating all switches (30 μF capacitance) resulted in over-compensation, causing the load characteristics to become capacitive; consequently, the power factor dropped to 0.50 and 0.43, accompanied by an increase in line current. The findings demonstrate that selecting the appropriate capacitor bank capacity can effectively improve the power factor and reduce line current in slip-ring induction motors.