Jurnal Teknik Terapan

Pengaruh Pengetahuan Bidang Otomotif Terhadap Minat Beralik ke Kendaraan Sepeda Motor Hybrid

Arif Wahyudiono, Azamataufiq Budiprasojo, Yuana Susmiati — Mon, 27 Apr 2026 00:00:00 +0000

This study aims to analyze the effect of automotive knowledge on public interest in switching to hybrid motorcycles. The research is motivated by the growing need for low-emission vehicles and the importance of consumer understanding in the adoption of hybrid technology. A quantitative research method was employed by distributing questionnaires to 100 respondents using an incidental sampling technique. The research instrument was tested for validity and reliability, and the collected data were analyzed using normality tests, homogeneity tests, Spearman Rank correlation, and the Mann–Whitney U-Test. The results indicate a strong and significant relationship between automotive knowledge and interest in hybrid motorcycles (ρ = 0.761; Sig. = 0.000). However, no significant difference in interest was found between respondents with high and low levels of automotive knowledge (Sig. = 0.554). Thus, automotive knowledge does not have a significant effect on public interest. These findings suggest that the decision to adopt hybrid vehicles is influenced more strongly by other factors, such as perceived usefulness, affordability, and infrastructure readiness.

Pemanfaatan Limbah Kotoran sapi Menjadi Biogas Sebagai Sumber Energi Listrik di Dusun Tegalmulyo, Kecamatan Bungatan, Situbondo

MOH MUFID, Ellya, Jerry, Nurul, Oni, Dafit, Dety Oktavia, Azam — Mon, 27 Apr 2026 00:00:00 +0000

Electricity is a basic need, but access to electricity in remote areas remains limited due to geographic and infrastructure constraints. Tegalmulyo Hamlet, dominated by cattle farming, has traditionally disposed of manure waste without optimal utilization, thereby polluting the environment. This community service activity aims to process cow dung waste into electrical energy through a community-based Biogas Power Plant (PLTBg). The approach used is Participatory Rural Appraisal (PRA), which actively involves the community in the planning, construction, and management of the system. A 1 m³ digester installation produces a potential biogas of 8.65 m³/day, with a theoretical electrical energy of approximately 96.6 kWh per day. In implementation, energy utilization is adjusted to the capacity of a 1 kW generator, thus meeting the electricity needs of 1,866 Wh per day for street lighting, livestock pens, and one resident's home. This program not only provides renewable energy but also reduces environmental pollution and produces organic fertilizer from biogas residue.

Analisis Kinerja Mesin Pencuci Ubi Jalar dengan Metode Rotary Berkapasitas 25 Kg pada UMKM Grubi Manis

Cahyo Cahyo sejati, Sigit Iswahyudi, Rany Puspita Dewi — Mon, 27 Apr 2026 00:00:00 +0000

Sweet potato (Ipomoea Batatas) is an agricultural commodity with high economic value that is widely used as a raw material for processed products by Micro, Small, and Medium Enterprises (MSMEs), including the sweet potato industry. In the processing process, the washing stage plays an important role in determining the level of cleanliness of the raw materials and product quality. However, at the MSME scale, sweet potato washing is generally still done manually using human power through the gejruk method, which is soaking the sweet potatoes in water accompanied by repeated mechanical force using foot treads. This method has limitations such as relatively long processing time, dependence on the operator, non-uniform levels of cleanliness, and the potential for low hygiene of the washing results. This study aims to design, build, and test the performance of a rotary-based sweet potato washing machine as an alternative to manual washing. The research methods include mechanical design, component manufacturing, and machine performance testing. The sweet potato washing machine is designed to work horizontally using a rotating tube system equipped with an internal screw, driven by a 5.5 hp gasoline motor, with a washing capacity of 25 kg in one wash, and a processing time of 7 minutes, which obtained excellent cleanliness results. The test results show that the rotary method machine is able to increase the efficiency of washing time and produce sweet potatoes that are cleaner and more hygienic than the manual method.

Perancangan dan Pembuatan Prototype Sistem Pemadaman Api Otomatis Berbasis Mikrokontroler Pada Ruang Baterai Bus Listrik

hendrik setiawan, Sigit Iswahyudi, Sigit Joko Purnomo — Mon, 27 Apr 2026 00:00:00 +0000

This study aims to design and develop a prototype of a fire suppression system for electric bus bateery compartments to mitigate the risk of thermal runway, shich can lead to catastrophic battery fires. The desin integrates an Arduino uno base controller eith themal and MQ-2 smoke sensors, connected to a fire suppression installation utilizing dry powder as the extinguishing agent. Testing results demonstrate that the system operates responsively and systematically the cooling fa activates 40℃ for thermal management, while the emergency fire suppression via a solenoid valve triggers automatically when the temperature reaches 60℃ or smoke density hits 200 ppm. The primary advantage of this prototype lies in its multi layered protection, combining proactive battery temperature conditioning with an automated fire extinguishing mechanism. This system significantly enhances the operational safety standards for electric vehicles by providing a reliable defense against battery relates hazards.

Studi Kinetika dan Isoterm Adsorpsi Ion Logam Berat Cr(VI) pada Arang Aktif

Dinda Novia Rahayu Putri, Hilman Imadul Umam, Teguh Pambudi — Mon, 27 Apr 2026 00:00:00 +0000

Heavy metal pollution in aquatic systems has become an increasingly significant environmental issue alongside the expansion of industrial activities. Effluents generated from electroplating, leather tanning, metal finishing, and pigment production industries often contain various hazardous heavy metals that pose serious threats to both the environment and human health. One of the heavy metals frequently detected in industrial wastewater is hexavalent chromium (Cr(VI)), which exhibits high toxicity and considerable mobility in aquatic enviroments. This study aimed to evaluate the effectiveness of activated carbon as an adsorbent for the removal of Cr(VI) ions from aqueous solutions using a batch adsorption method. Operational parameters analyzed included solution pH, adsorbent dosage, and contact time. Chromium concentrations were determined using a UV-Vis spectrophotometer, while the adsorption mechanism was investigated through kinetic and isotherm models. The results indicated that adsorption efficiency increased significantly under acidic conditions, reaching an optimum at pH 2 with an adsorbent dosage of 0.25 g and a contact time of 60 minutes. Kinetic analysis revealed that the adsorption process followed a pseudo-second-order model, suggesting the involvement of chemical interactions between the metal ions and the adsorbent surface. Isotherm analysis demonstrated that the Langmuir model provided a better fit than the Freundlich model, indicating that adsorption occurred in a monolayer configuration on the adsorbent surface. These findings suggest that activated carbon has high potential as an adsorbent material for treating wastewater containing heavy metals, particularly hexavalent chromium.

Analisis Kinerja dan Efisiensi Alat Uji Nozzle Injector Diesel Berbasis Limbah Hydraulic Jack

Julianro Elvis Sunbanu, Damianus Manesi, Wofrid E Bianome — Mon, 27 Apr 2026 00:00:00 +0000

The limited availability of affordable and reliable diesel nozzle injector testing devices remains a significant constraint in small-scale workshops and mechanical engineering laboratories. In fact, the performance of a nozzle injector plays a critical role in determining fuel atomization quality, which directly affects combustion efficiency and exhaust emissions. This study aims to develop and evaluate the performance of a diesel nozzle injector testing device based on a recycled hydraulic jack as a cost effective and appropriate technology solution. The research employed a Research and Development (R&D) method with an experimental approach, including system design using SketchUp software, prototype fabrication and assembly, and performance testing. Experiments were conducted in five repetitions for each parameter, measuring maximum pressure, pressure stability after 10 seconds (P10s), and spray characteristics in terms of angle and width. The data were analyzed quantitatively using mean, standard deviation, coefficient of variation, as well as efficiency and effectiveness calculations. The results show that the device achieved an average pressure of 257 kg/cm² with a coefficient of variation below 20% and a pressure drop of approximately 7%, which falls within the standard operating range of conventional diesel nozzles (200-300 kg/cm²). The spray pattern exhibited a fan shape with an average angle of 19.67° and a width of 10.4 cm, indicating stable atomization performance. The system efficiency reached 93%, while the effectiveness was 33.3%, suggesting the need for improvement in pressure control.

Retrofitting Alternatif Refrigeran Ramah Lingkungan R-290 dengan R-134a pada Trainer Unit Instalasi Sistem Refrigerasi

Rizki Muliawan, Muhammad Akmal, Parisya P Rosulindo, Annisa S Kurniasetiawati — Mon, 27 Apr 2026 00:00:00 +0000

R-134a refrigerant has been widely used in industrial and commercial refrigeration systems; however, its high global warming potential (GWP) of up to 1430 has driven the search for more environmentally friendly alternatives. R-290 (propane) is considered a promising candidate due to its zero ozone depletion potential (ODP) and very low GWP of only 3, along with thermodynamic properties that are relatively comparable to those of R-134a. This study aims to evaluate the performance of a refrigeration system retrofitted from R-134a to R-290 using two types of expansion devices, namely a thermostatic expansion valve (TXV) and a capillary tube. The experimental method was conducted by varying the refrigerant charge based on equal mass and maintaining similar evaporator temperature conditions under no-load operation. The results indicate that the system using R-290 is capable of delivering cooling performance comparable to that of R-134a for both types of expansion devices. Furthermore, the use of R-290 results in lower energy consumption, with energy savings ranging from 8% to 9% compared to R-134a. This comparable performance suggests that the thermodynamic properties of R-290 are sufficiently compatible to replace R-134a in the same system without requiring significant modifications to the main components. The observed performance differences are primarily influenced by flow characteristics and the expansion process associated with each type of expansion device. Therefore, R-290 demonstrates strong potential as an environmentally friendly and energy-efficient alternative refrigerant, particularly for retrofit applications in existing refrigeration systems.

Simulasi Distribusi Tegangan dan Deformasi pada Sasis Truk Light Duty dengan Variasi Panjang Rangka Sisi Menggunakan Metode Elemen Hingga

Ethys Pranoto, Gunawan, Rifano, Ery Muthoriq, Siti Shofiah — Mon, 27 Apr 2026 00:00:00 +0000

: In the field of freight transportation, changes to vehicle structures, particularly in the chassis length dimension, are commonly carried out to increase load-carrying capacity. One form of such change involves extending the frame length and adjusting the wheelbase in commercial vehicles with a 1.2 axle configuration. Although this approach can increase the volume of cargo that can be transported, alterations in structural dimensions have the potential to affect the load distribution contour on the vehicle frame. An uneven load distribution may lead to increased stress in certain areas, greater deformation, and a reduction in the structural safety level, which can ultimately affect the reliability and operational safety of the vehicle. This study aims to examine the effect of chassis length variations on the characteristics of the load distribution contour in freight transport vehicles with a 1.2 axle configuration. The analysis focuses on evaluating changes in stress, deformation, and the safety factor of the frame structure resulting from variations in chassis length and wheelbase adjustments. The approach used is a numerical simulation based on the Finite Element Method, utilizing software to model and evaluate the structural response of the chassis frame under loading conditions. The simulation results show that an extension of the chassis length, accompanied by changes in wheelbase position, leads to higher displacement and stress distribution in the chassis frame. The extension of the chassis side frame structure leads to an increase in stress values, which even exceed the material’s yield strength, with a maximum value reaching approximately 3709 MPa. In addition, the displacement reaches up to 81 mm, indicating increased frame deflection. Therefore, any changes in chassis dimensions must be designed by carefully considering load distribution and overall structural strength in order to maintain the reliability and safety of freight vehicles.

Analisis Kinerja Heat Exchanger Tipe Shell and Tube Berdasarkan Nilai Fouling Factor, Efesiensi, dan Pressure Drop sebagai Indikator Kinerja Operasional

Mon, 27 Apr 2026 00:00:00 +0000

The oil and gas industry heavily relies on the efficiency of shell-and-tube heat exchangers to maintain operational stability, optimize energy consumption, and preserve product quality. However, the performance of these units is often degraded by fouling, which increases thermal resistance. This study aims to evaluate the actual performance of a heat exchanger unit in the oil and gas industry by analyzing operational data over a specific period. The research methodology involved direct field observation and quantitative analysis based on key performance parameters, including the overall heat transfer coefficient, fouling factor, thermal efficiency, and pressure drop. The fouling factor was calculated as the difference between the clean and dirty heat transfer coefficients, while thermal efficiency was determined as the ratio of the actual heat transferred to the maximum possible heat transfer. Pressure drop analysis was conducted on both the shell and tube sides using friction factor correlations and fluid hydrodynamic parameters to evaluate flow characteristics. The results indicate a fouling factor of 0.2076 hr·ft²·°F/Btu, which significantly exceeds the standard threshold proposed by Kern (0.002–0.005 hr·ft²·°F/Btu). This high level of fouling results in a heat transfer efficiency of only 64.62%, well below the ideal operational standard of 75%. Hydrodynamic analysis shows that the pressure drop is very low (0.0003–0.0006 psi), indicating that the flow is in the laminar regime (Re < 2100). This laminar condition reduces heat transfer effectiveness due to the dominance of conduction and accelerates the deposition of solid particles on the heat transfer surface. Although the unit is still considered operable, the evaluation results highlight the need for immediate cleaning and flow rate optimization to restore the equipment’s performance to optimal levels and prevent further energy losses

Pengaruh Modifikasi Burner dan Variasi Campuran Bahan Bakar Pirolisis Limbah Polipropilena terhadap Efisiensi Termal dan Karakteristik Pembakaran

Mon, 27 Apr 2026 00:00:00 +0000

This study presents the optimization of burner design and experimental evaluation using liquid fuel derived from polypropylene (PP) waste pyrolysis to achieve high thermal efficiency. The increasing accumulation of plastic waste and rising energy demand have driven the development of alternative fuels and more efficient combustion systems. In this work, polypropylene waste was converted into liquid fuel through a pyrolysis process and subsequently utilized as the primary fuel in a modified burner system. The optimization focused on key design parameters, including nozzle diameter, air–fuel mixing configuration, and combustion chamber geometry to enhance atomization quality, flame stability, and heat transfer performance.Experimental tests were conducted under various operating conditions to evaluate combustion characteristics, fuel consumption rate, flame temperature, and thermal efficiency. The results show that the optimized burner configuration produced a stable blue–orange flame with improved atomization and more complete combustion compared to the initial design. The maximum thermal efficiency achieved was 105.54%, indicating a significant improvement due to better air–fuel mixing and reduced heat losses during the combustion process. Furthermore, the pyrolysis oil demonstrated strong potential as an alternative liquid fuel for small-scale thermal applications.This study provides a practical contribution to waste-to-energy technology by integrating burner design optimization with plastic waste-derived fuel utilization, offering an effective approach to enhance thermal system performance while supporting sustainable and scalable small-scale energy solutions.

The Free Fatty Acid Reduction Using Cacao (Theobroma cacao L) Bean Husk Charcoal In Used Cooking Oil

Dafit Ari Prasetyo, Dicky Adi Tyagita, Cahyaning Nur Karimah, Umi Sholikah — Mon, 27 Apr 2026 00:00:00 +0000

Used cooking oil if not well-maintained will give some problems to drainage system or surface water. Used cooking oil has the potential to be processed into energy. However, the high free fatty acid (FFA) as a result of the use of cooking oil makes the process into energy more difficult. Because the high free fatty acid content will cause the saponification reakction in making used cooking oil into energy. Cocoa bean husk charcoal (Theobroma cacao L) has a K₂CO₃ content that similar to its commercial product, and also contains some traces of silicates and sulfates so that it can increase the efficiency of free fatty acids removal in used cooking oil. In this study, tests were carried out to reduce FFA levels in used cooking oil using charcoal from cocoa bean husks activated with 10M of hydrochloric acid, varying the concentrations of 5, 7.5, and 10%-m/v, as well as the temperature treatment during the process of mixing used cooking oil with activated charcoal adsorbent, which was 75, 100, and 150°C. The best FFA reduction results were found in the C2T2 reactor which reached 75% of FFA removal, where the best concentration of cocoa bean husk charcoal as an adsorbent were 7.5%m/v and the temperature of the mixing process was 100°C which can remove FFA content from 2.72 to 0.64