JTT (Jurnal Teknologi Terapan)
Not a member yet
238 research outputs found
Sort by
Perbandingan Kekuatan Tarik dan Kekerasan Vickers Pada Pengelasan FCAW Multipass Baja EH36 dan Grade A dengan Variasi Shielding Gas
No full textThis study aims to investigate the influence of shielding gas composition on the mechanical behavior of multipass Flux Cored Arc Welding (FCAW) joints in low-carbon steels EH36 and Grade A. Welding was conducted at a current of 200 A and a gas flow rate of 10 L/min using two types of shielding gases: 100% CO₂ and an Ar 80%–CO₂ 20% mixture. Two welded coupons were produced for each condition and subsequently subjected to tensile testing in accordance with ASME Section IX standards and micro vickers hardness testing. The tensile test results revealed that the highest tensile strength was achieved with the Ar 80%–CO₂ 20% shielding gas, with values of 455.02 MPa and 456 MPa, showing a slight improvement compared to 454.04 MPa and 453.06 MPa obtained with 100% CO₂. The difference in tensile strength between shielding gases was relatively small, at 0.22% for the first specimen and 0.65% for the second specimen. The micro vickers hardness results indicated an increase in hardness within the weld metal, ranging from 193–238 HVN (100% CO₂) and 213–235 HVN (Ar 80%–CO₂ 20%), both exceeding the base metal hardness. The findings extend previous research by providing a comparative assessment of two low-carbon steels welded using multipass FCAW under controlled shielding gas conditions
PENGARUH VARIASI TEMPERATUR INTERCRITICAL ANNEALING TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA AISI 1020 DENGAN MEDIA PENDINGIN AIR GARAM
Full text linkThe development of technology in enhancing the mechanical properties of materials, such as hardness in metals, has progressed rapidly, particularly in steel. Based on its carbon content, carbon steel is classified into three categories: high-carbon steel, medium-carbon steel, and low-carbon steel. Low-carbon steel contains carbon in the range of 0.04% to 0.30%, one of which is AISI 1020 steel. This study aims to determine the effect of varying intercritical annealing temperatures on the microstructure and hardness of AISI 1020 steel using a saltwater cooling medium. The heating process was conducted using a furnace for 3 hours at different temperatures of 673°C, 723°C, 773°C, 823°C and 873°C. The tests performed included microstructure analysis and hardness testing. The hardness test was conducted using a hardness tester with the Vickers method, while the microstructure analysis was carried out using a trinocular metallurgical microscope. The results showed that the formed phases remained the same as in the initial specimen, consisting of ferrite and pearlite. The highest hardness value was obtained from the specimen heated at 823°C, reaching 243.49 HVN, while the lowest hardness value of 184.33 HVN was recorded in the initial specimen without heat treatment
RANCANG BANGUN MESIN PENCETAK TUSUK SATE MENGGUNAKAN TEKNOLOGI DOUBLE ROLL UNTUK MENINGKATKAN PRODUKSI TUSUK SATE DI DESA KRASAK
No full textThe expansion of the market or need for satay skewers has resulted in micro, small and medium enterprises producing satay skewers, especially in Krasak Kualahan village, to meet consumer needs. In Krasak village, micro, small and medium businesses still use traditional methods to process bamboo into skewers. However, this method requires a long time. Therefore, this machine was created to help skewer production businesses speed up the production process. By making a skewer printing machine using Double Roll technology, it will help businesses to increase production results. Double Roll technology is a technology that utilizes two rolls that are close together to produce thrust. The way this skewer molding machine works is by inserting bamboo pieces 50mm wide and 0.8mm thick, 22 cm long between the rollers that coincide with each other. This machine has 2 knife functions, namely flattening and forming uses an AC electric motor as a driver with specifications 1Phase 1HP 1400RPM
Analisis Pengaruh Temperatur Udara Lingkungan Terhadap Performa Sistem Gas Turbine Unit 1 di PT PLN Indonesia Power UBP Cilegon
No full textThe performance of Gas and Steam Power Plants (PLTGU) is significantly influenced by ambient air temperature and production load levels. This study thermodynamically analyzes the impact of these variables on the gas turbine performance of PLTGU Unit 1 at PT. PLN Indonesia Power UBP Cilegon. Variables investigated include ambient air temperature from 25°C to 32°C and production loads of 72 MW and 129 MW. Parameters evaluated are compressor and turbine isentropic efficiency, thermal efficiency, and net power output. Results indicate that increasing ambient air temperature negatively correlates with gas turbine performance. For instance, at a 129 MW load, a temperature rise from 25.13°C to 32.05°C decreased compressor efficiency (from 78.63%), turbine efficiency (from 90.71%), and thermal efficiency (from 36.58%), while increasing compressor power consumption, causing net power to drop from 162,401.2 kJ/s to 159,889.7 kJ/s. Furthermore, operating at a 129 MW load yielded more optimal gas turbine performance compared to 72 MW. These findings highlight the crucial role of both factors in optimizing PLTGU operations and efficiency
Analisis Kinerja Evaporator AC Split yang Dimodifikasi untuk Cold Storage Puree Mangga
No full textThe use of dedicated refrigeration systems for cold storage typically requires high investment costs; therefore, a split air conditioner (AC) is selected as an alternative to reduce installation expenses. However, the narrow spacing of the evaporator fins in split AC units often leads to frost accumulation, which reduces system performance. For this reason, the evaporator fins were modified to improve the cooling performance. This study aims to determine the cooling time required to reduce the product temperature to 4°C and to evaluate the overall performance of the modified system. The research method includes system design, cooling load calculation of 5036.54 W, selection of a 2 HP cooling unit, and experimental testing under controlled load conditions. The results indicate that the product temperature of 4°C can be achieved within 5 hours and 50 minutes, with a system efficiency of 52% and an average power consumption of 1031.05 W. The estimated monthly energy consumption is 180.3 kWh, with an operational electricity cost of IDR 260,479.41. These results demonstrate that the modified evaporator in a split AC system can serve as a cost-effective and functional solution for small-scale cold storage application
Bug Tracking pada Pengembangan Software Menggunakan Metode Support Vector Machine (SVM)
No full textThis study aims to optimize the classification of bug severity levels in software bug reports using the Support Vector Machine (SVM) algorithm, supported by the Synthetic Minority Oversampling Technique (SMOTE). The data imbalance in severity classes often leads to machine learning model bias towards the majority class. Therefore, SMOTE is applied to balance the number of samples in each class. Feature extraction is conducted using the TF-IDF method on the bug report summaries. Evaluation results show that applying SMOTE significantly improves classification performance, with more balanced predictions across High, Medium, and Low classes. This study employs the Knowledge Discovery in Database (KDD) framework to ensure a systematic approach to data processing
INVESTIGASI KUALITAS UDARA RUANG PERKULIAHAN DI KOTA BANDUNG MENGGUNAKAN VENTILASI PASIF
Full text linkIndoor air quality has become a critical concern due to its significant impact on human health, as 80%-90% of human activities are conducted indoorsThis study aims to assess the air quality in a university classroom in Bandung City that utilizes passive ventilation, focusing on CO₂ concentration, temperature, and humidity parameters. A quantitative approach involving observational and experimental methods was employed by varying the opening levels of passive ventilation into three conditions: fully open, half-open, and fully closed. The results indicate that fully open ventilation effectively maintains good air quality with stable CO₂ concentration, temperature, and humidity. Conversely, under fully closed ventilation conditions, there is a significant increase in CO₂ concentration, temperature, and humidity, which can reduce comfort and pose health risks.The findings emphasize the importance of managing passive ventilation to ensure a healthy and comfortable classroom environment
SIFAT FISIKA PAPAN SEMEN DARI CAMPURAN LIMBAH BATANG SAWIT
No full textThis study investigates the physical properties of cement boards made from oil palm trunk waste and evaluates the effect of varying cement-to-palm trunk waste ratios (70:30, 75:25 and 80:20). The independent variable is the cement-to-waste ratio, and the dependent variables include density, moisture content, thickness swelling, and water absorption. Results show that the density of the boards ranges from 0.70 g/cm³ to 1.02 g/cm³, moisture content from 6.79% to 14.49%, thickness swelling after 24 hours of immersion from 17.50% to 70.00%, and water absorption from 40.41% to 68.04%. Ratio 70:30 and 75:25 meet Indonesian National Standard (SNI) criteria for density and moisture content, but thickness swelling exceeds the standard, indicating poor dimensional stability. Increasing cement content improves density and reduces moisture content, but challenges remain in achieving dimensional stability and water resistance. These findings suggest that while oil palm trunk waste can be used in cement board production, further optimization, such as additive incorporation or feedstock modification, is needed to enhance water resistance and stability
Perancangan dan Analisis Statik Elemen Transmisi untuk Mobil Desa Berpenggerak Four Wheel Drive (4WD)
No full textThe design of a transmission system for a village car is important to fulfil the need for a vehicle that is capable of travelling through rough terrain such as rocky, sandy roads and steep climbs. Village cars are designed with a four-wheel drive (4WD) system to ensure optimal traction in various road conditions. This research aims to design and analyse manual transmission elements consisting of bevel gears, transmission shafts, bearings, and splines, with a design engineering approach based on finite element analysis with SolidWorks software. The stages begin with a literature study and determination of design specifications based on DIN standards, followed by calculating the dimensions of the main components using the machine element formula. The 3D model of each component was created in SolidWorks, then statically analysed by setting boundary conditions according to actual working conditions, including the provision of torque loads and reaction forces, as well as the Meshing process to produce accurate simulation results. The design results indicate that the transmission system can withstand a maximum torque of 17,012 kg.mm at the first Gear level with a rotational speed of 726.47 rpm. The main material used is S45C carbon steel for the Gears and shafts, with a minimum shaft diameter of 40 mm. Bearings used are adjusted to serial numbers 6208 for the input shaft and 30308 for the counter and output shafts. Static analysis shows that the designed dimensions and materials meet safety criteria, with maximum stress, deflection, and safety factors within permissible limits. This research produces a transmission system design to village cars with 4WD, contributing to the development of vehicle technology for rural areas
Pengaruh Pembersihan Modul PV Terhadap Efisiensi dan Kinerja di PLTS Terapung
No full textSolar Power Plants are a potential source of renewable energy in Indonesia, especially the Cirata Floating Photovoltaic with a capacity of 192 MWp/145 MWac. This study aims to analyse the comparison of efficiency and performance of photovoltaic (PV) modules before and after cleaning, as well as to examine the influence of dust, dirt, and environmental factors on module performance. The methods used include direct measurements using the IV Curve Tracer tool. Results showed an increase in average efficiency from 14.69% to 17.62% after cleaning, with a reduction in power losses due to dust and dirt of 15.61%. A decrease in module performance was recorded at -11.96% before cleaning and improved to -7.90% after cleaning in August 2024. In February 2025, the module performance improved from -9.73% to -2.39% after cleaning. Environmental factors such as high temperature, rainfall, and dust accumulation also affect the module performance. Regular cleaning every 5-6 months is essential to maintain the efficiency and durability of the modules and support environmental management at Cirata Floating Solar Power Plant