Jurnal Teknik Mesin

Pengaruh Variasi Jumlah Blade Impeller Pada Waterjet Thruster Terhadap Gaya Dorong

2025-06-13T17:29:09+07:00

Waterjet thruster is a boat propulsion system that produces thrust as a replacement for conventional propellers. Waterjet thruster has an impeller as the main driver to move the boat in the waters. In this study, a waterjet thruster prototype will be tested with a diameter of 1 inch with variations in the number of impeller blades, variations of 3 blades, 4 blades and 5 blades, each 1. While the inlet and outlet with a variation of 9 blades, the filament used is ST-PLA filament with a diameter of 1.75 to print the prototype outlet, inlet and impeller, the thrust force is obtained with different variations in the number of blades. So that the variation in the number of impeller blades affects the thrust force produced. The variation in the number of impeller blades with the highest thrust force is produced by the variation of 3 blades 1.4960255 N, and the lowest thrust force results in the variation of 6 blades 0.613125 N. This means that the fewer impeller blades used, the less friction occurs between the blade and the fluid so that the thrust force produced can be maximized.

Reverse Engineeirng Karakteristik Geometri dan Analisis Fungsi Konfigurasi Golok Koleksi Museum Situs Kepurbakalaan Banten Lama

2025-06-13T17:29:11+07:00

The research refers to the civilization of manufacturing technology during the Banten Sultanate which carried out metal trade with foreign countries. One of them exported a copper ore to Keling Country and imported scrap iron from Europe. By obtaining the results of the research, it is hoped that it can reveal what manufacturing technology was used, what materials were used in making machete samples and get the usefulness of the research results that can be used. The purpose of this research is to identify the manufacturing process used when making the machete and determine the effect of the configuration on the function of the machete and the strength of the material, determine the effect of the comparison between the modern machete and the museum collection machete and identify the nature of research on the museum collection machete. The method used is a reverse assessment method of a sample of the museum collection's golok. The results obtained are the function of the machete which tends to be in a combination function (attack and control) with a CoG percentage of 35.45 - 41.42% of the overall length of the machete and the manufacturing process used on one of the machetes in the form of casting (cast) with reference to the results of metallographic testing getting nodular cast iron results, with the results of simulations using solidworks giving loading in the lateral and axial directions experiencing stress of 2.936x108 N/m² and 1.541x108 N/m² and a lateral safety factor of 1.2 and axial 2.3.

Optimisasi Jarak Titik Spot welding Terhadap Tensile Strength Sambungan Stainless Steel

2025-06-13T17:29:13+07:00

Spot welding is a metal joining technique that can produce high joint strength according to the desired design. Spot welding, using current through the weld point with two electrodes to melt the metal and combine it. In joining two plates, if you want to produce a better joint, more than one welding point can be done, but the distance between one and the other needs to be considered in order to produce a joint that has high tensile strength. Therefore, in the study, the distance of the point connection was varied with the aim of finding the optimal connection point to produce high tensile strength. The study was conducted using a spot-welding machine in the Mechanical Engineering Study Program laboratory, stainless steel plate material was connected with a current voltage of 1.75 V and 2.20 V, and variations in the distance of the welding point were 10, 20 and 30 mm. The welding specimens were tested for tensile strength using a tensile test in the engineering materials laboratory. The results of the study showed that the highest tensile strength value of 3835.08 MPa was obtained at a current voltage of 2.20 V and a welding point distance of 10 mm. The further the welding point, the greater the electrical resistance, which causes the distribution of heat and current to be uneven. As a result, not all parts required for the formation of the joint will be optimally affected by heat and pressure.

Perancangan Mesin Perontok Padi Dengan Sistem Rotari

2025-06-13T17:29:14+07:00

Rice is one of the staple foods consumed by the people of Indonesia, including the Bangka Belitung Islands Province, more precisely in Bangka Regency, Riau Silip District, Banyu Asin Village. Newly harvested rice is usually not yet separated from the straw/panicle. The rice harvesting process still uses traditional tools or also called gebotan. One example is the rice threshing machine in Banyu Asin Village which has not been able to maximize the threshing results, which results in a long threshing process. The machine is only capable of threshing 30 kg/hour of rice that is put into the machine. Based on these needs, a rice threshing machine design was made to facilitate the threshing process. The design of the rice threshing machine refers to the design method, namely: planning, conceptualizing, designing, and finishing, then assessed based on technical and economic aspects. The designed machine uses a rotary system to thresh rice from its stalks, uses a combustion engine as a driving system, pulleys and belts as transmission elements, and the machine can be moved because it is lighter than existing machines. From the design results, this rice threshing machine has a minimum capacity of 80 kg/hour.

Analisis Distribusi Termal Model Tabung Rheology Test Apparatus Sebagai Media Pengujian Ultrafine Bubbles (UFBs)

2025-06-13T17:29:16+07:00

The Fukushima Daiichi nuclear reactor accident has become a major concern in the development of safety design for advanced nuclear reactors. The reactor coolant system is part of the passive safety system, including the containment or reactor building cooling system. This system is designed to prevent damage to the reactor vessel structure and concrete building materials due to excessive heat release into the environment. The coolant flow is designed to move naturally without the help of a pump, utilizing the difference in fluid density as the main driver. The type of coolant plays a major role in generating the flow, especially in terms of its density properties. Fluids with a lower density than water can produce faster flow. One method to reduce the density of water is to insert fine bubbles known as ultrafine bubbles (UFB). To study the thermal characteristics of the fluid when heated, the Rheology Test Apparatus device is used. This study specifically examines the Rheology tube model. Analysis of temperature distribution in the tube is carried out using Computational Fluid Dynamics (CFD) simulations to understand the heat transfer mechanism. The validation process was carried out through experiments at a fluid temperature of 90°C, with a comparison of the temperatures at two points in the height of the tube, namely 0.16m and 0.8m, which are the locations of the heater and show the highest temperature.

Analisis Perawatan Mesin Bubut CD6250C Dengan Metode Reliability Centered Maintenance (RCM) di PT. XYZ

2025-06-13T17:29:19+07:00

PT XYZ is one of the industries engaged in the manufacturer of agricultural, plantation, industrial equipment / machinery that can make / engineer tools / machines. Conventional lathe is one of the production machines in PT XYZ. Lathe machines are often damaged so they require maintenance. This study aims to provide maintenance proposals for conventional lathe machines through the application of the RCM approach in order to get a more effective and efficient maintenance strategy, the application of RCM starts from identifying system functions and malfunctions, Intermediate Decision Tree (IDT) analysis and Logic Tree Analysis (LTA), Failure Mode and Effect Analisys (FMEA) analysis, Mean Time Between Failure (MTBF) and Mean Time To Repair (MTTR) analysis and selection of maintenance proposals. From the results of the RCM analysis of conventional lathe machines, it is obtained that the components that have the largest Risk Priority Number (RPN) are Lathe Chisels 54 RPN, Chuck / Chamfer 30 RPN, V-Belt & Pulley 20 RPN. The results of the proposed maintenance for lathe machines are Preventive Maintenance, component maintenance is carried out before experiencing damage such as chuck before 1112.5 hours of use, Lathe Chisel before 185.08 hours of use, V-Belt + Pulley must be repaired before 2226 hours according to MTBF calculations.

Pembuatan Referensi Praktik Dasar Perancangan Progressive Die pada Perangkat Lunak Siemens NX

2025-06-13T17:29:21+07:00

As a continuous improvement through state-of-the-art discovery and uniqueness for the learning material of the Progressive Die Design practical lecture, it is necessary to update it by reviewing 2 aspects, namely "knowledge of how to design progressive die" and "its application to Siemens NX software". Knowledge is obtained by comparing design methods from several selected sources and producing logical progressive die design operation guidelines in sequence. The application on Siemens NX uses the Siemens NX feature optimization method to produce the best design in a relatively short time, with the guidance of design knowledge that previously obtained. An example of a fairly complex sheet metal product is selected as an object for progressive die design. This design requires the selection and combination of Siemens NX features to produce the stages of operation planning, strip development and die designing. The difference sheet metal geometric complexity will result a different number of stages due to the uniqueness of the alternative features selection and combinations. The knowledge and application of design process are documented into a tutorial reference book and tested on students with a feasibility result above 90%. Eligibility data was obtained by filling out a questionnaire after studying the reference book.

Analisis Coefficient of Performance (COP) dengan Pemanfaatan Energi Panas Discharge Kompresor Sistem Heat Exchanger Double Tube pada AC 1 PK untuk Pemanas Air

2025-06-13T17:29:23+07:00

Hot water has become an important part of everyday life. Utilization of waste heat is increasingly relevant in the modern era, due to very significant technological advances. One of them is the refrigeration system which regulates temperature by transferring heat energy from inside to outside the room. Basically, this heat can be used to heat water by absorbing heat before it reaches the condenser. Reusing waste heat from the condenser can save the electricity needed to heat water, making it an efficient way to utilize wasted energy. This research aims to determine the effect of variations in HE (heat exchanger) pipe length on the performance of the Coefficient of Performance COP, and the required electrical power consumption using heat exchanger calculation analysis for the CoolPack application. This research uses an experimental method on a 1 PK split AC with variations without a heat exchanger and with a 3 pass, 5 pass double tube heat exchanger. The results of this research show that without a heat exchanger the average COP is 3.68 and the electric power is 0.063 kWh, with a 3 pass heat exchanger the average COP is 4.1 with an increase of 11.4% from the data without using a heat exchanger and an electric power of 0.054 kWh, with a 5 pass heat exchanger the average COP is 4.66 with an increase of 26.6% from the data without using a heat exchanger and an electric power of 0.052. kWh. This shows that the better the heat dissipation in the condenser, the greater the heat absorbed by the evaporator, making the COP higher and the compressor work lower. Therefore, the use of electrical power is lower and the performance of an Air Conditioning system is more efficient.

Rancang Bangun Cetakan Alat Press Pelepah Pinang Menjadi Wadah Makanan Ramah Lingkungan untuk UMKM

2025-06-13T17:29:24+07:00

The issue of plastic waste has become a global concern that urgently needs to be addressed. On the other hand, agricultural waste also poses its own challenges. Indonesia is an agrarian country where the agricultural sector plays a significant and vital role in the national economy. One of the major agricultural products in Indonesia, particularly in West Sumatra, is areca nut (betel nut). The areca palm sheath is largely underutilized by farmers, often left unused or burned, which in turn leads to another issue—air pollution. The transformation of organic solid waste into eco-friendly products is still rarely implemented. This study aims to design, assemble, and test a simple press mold to process areca palm sheaths into environmentally friendly food containers. The results show that the mold was successfully designed with dimensions of 140 mm x 140 mm x 20 mm, using ST 42 material. Mold testing with temperature variations (100°C, 150°C, and 175°C) and durations (1 minute, 2 minutes, and 5 minutes) indicated that a temperature of 150°C produced the best results in terms of color and shape accuracy. This innovation is expected to support small and medium enterprises (SMEs) in reducing plastic waste and utilizing areca palm sheath waste.

Analisis Gaya Drag Pada Mobil Sedan dengan Penambahan Komponen Drag Reduction

2025-06-19T09:04:20+07:00

The aerodynamic design of a vehicle body plays a critical role in reducing air resistance (drag), thereby contributing to improved fuel efficiency. Aerodynamic resistance in vehicles is influenced by several parameters, including body geometry, auxiliary elements, and the orientation of the vehicle relative to the airflow. This study aims to analyze the effects of body shape variations and the addition of a spoiler on drag force reduction in a sedan-type vehicle. The methodology employed in this research is numerical simulation using Ansys Fluent software. Simulation results indicate that the model with a more streamlined geometry (Model C) produces a lower drag force compared to the model equipped with a spoiler. The drag coefficients obtained for each configuration are as follows: Sedan A — 0.780, Sedan B with a spoiler — 0.775, and Sedan C with an improved body geometry — 0.647. These findings suggest that optimizing body shape is more effective in enhancing the aerodynamic performance of a vehicle than the addition of external aerodynamic elements such as a spoiler.

Analisis Efektivitas Thermal Insulation pada Sekat Ruang (Bulkhead) Bus untuk Mengurangi Panas Mesin

2025-06-19T16:39:08+07:00

This study aims to evaluate the effectiveness of two types of thermal insulation materials, namely polyurethane (PU) foam and basaltwool, in reducing heat transfer from the engine compartment to the passenger cabin through the bus bulkhead structure. Optimal thermal insulation is essential to maintain cabin thermal comfort and enhance safety within the vehicle interior. The testing methods included measurements of thermal conductivity and evaluations of each material’s resistance to extreme temperatures. The results indicate that PU foam exhibits lower thermal conductivity (±0.020–0.028 W/m·K) and achieves heat retention efficiency of 95–98% at temperatures around 100°C. On the other hand, basaltwool shows slightly higher thermal conductivity (±0.035–0.040 W/m·K) with efficiency ranging from 90–95%, but significantly outperforms in terms of heat resistance, withstanding temperatures as high as 600–1000°C. Based on these findings, PU foam is considered more suitable for applications that require thermal efficiency at moderate temperatures, while basaltwool is better suited for environments exposed to continuous high temperatures. Therefore, the appropriate selection of insulation material should be based on specific operational conditions to optimize both thermal comfort and cabin safety.

Studi Perbandingan Emisi dan Kinerja Motor Bensin dengan Bahan Bakar Campuran Etanol

2025-06-24T21:39:19+07:00

The rapid development of transportation can have an impact on the surrounding environment such as congestion, air pollution, noise pollution, accidents, delays, and increased fuel consumption. Alternative fuels are very necessary and needed to minimize the dangers of the impact of increased motorized vehicles, especially air pollution and increased fuel consumption. Ethanol is one of the alternative fuel sources to replace or as a fuel mixture that is classified as biofuel. The purpose of this study is to determine the impact of ethanol-blend use on exhaust emissions and engine performance in gasoline motorcycles. The ethanol-blend variations used as fuel start from pure pertalite (PE0), pertalite + 5% ethanol (PE5), pertalite + 10% ethanol (PE10), pertalite + 15% ethanol (PE15), and pertalite + 20% ethanol (PE20). The results of this study show that the use of ethanol-blend has an impact on engine performance and exhaust emissions of gasoline motorcycles. PE5 fuel is the best fuel variation with CO exhaust emissions of 0.13% and HC of 26.7 ppm at 4000 rpm engine speed. Meanwhile, the highest torque engine performance was achieved with PE5 fuel with a torque of 114.9 Nm, and the engine power reached 71.6 HP with PE20 fuel. Compared to the use of pure pertalite fuel of 113.6 Nm at 2500 rpm engine speed and 69.0 HP at 5000 rpm engine speed, respectively.

Pengaruh Secondary Skin Dengan Variasi Kemiringan Sudut Fasad Terhadap Efisiensi Energi Dan Kenyamanan Termal Ruangan

2025-06-25T08:22:31+07:00

This study examines the effect of applying secondary skin with varying slope angles on the facade on energy efficiency and indoor thermal comfort. Facades with varying slope angles are designed to respond adaptively to external environmental conditions, such as solar radiation intensity, air temperature, and wind movement, with the aim of minimizing the building's thermal load and improving overall thermal performance. An experimental approach is used to evaluate the effectiveness of secondary skin with varying slopes. The thermal comfort parameters measured include air temperature, relative humidity, lighting intensity, and energy requirements for cooling, all of which are analyzed based on ASHRAE standards. The results of the study indicate that the use of facades with opening slopes of 10°, 20°, and 30° can reduce the room cooling load by 11.05%, 10.95%, and 10.80%, respectively. In addition, there was a decrease in the average Predicted Mean Vote (PMV) value of 0.059 (5.03%) at a slope of 10°, 0.073 (6.29%) at a slope of 20°, and 0.078 (7.20%) at a slope of 30°. These findings indicate that secondary skin with variations in the slope angle of the facade is an innovative and sustainable approach in passive cooling strategies, which contributes to reducing energy consumption.

Analisa Pengaruh Penggunaan Oli Pelumas 15W-40 dan 10W-40 Terhadap Performa Mesin Motor Matic 110 CC

2025-06-26T08:41:34+07:00

This study aims to analyze the impact of using lubricating oils with SAE 10W-40 and SAE 15W-40 viscosities on the performance of 110cc automatic motorcycle engines. The tests focus on the effects of both types of oil on engine power, torque, and air-fuel ratio (Air Fuel Ratio/AFR). This research employs an experimental method involving laboratory tests and road tests to obtain accurate data. The viscosity tests show that SAE 10W-40 oil has lower viscosity at low and medium temperatures compared to SAE 15W-40, which has higher viscosity and is more stable at high temperatures. The power and torque tests indicate that SAE 10W-40 oil produces more stable maximum power within the medium RPM range, while SAE 15W-40 has a sharper peak power but within a more limited RPM range. The torque tests also show that SAE 10W-40 performs better in maintaining torque over a longer range. Additionally, AFR analysis indicates that SAE 10W-40 oil approaches the ideal ratio for efficient combustion, while SAE 15W-40 tends to produce a richer mixture at high RPM, which improves performance but reduces fuel efficiency. The results suggest that the selection of oil with the appropriate viscosity significantly affects engine performance, especially in terms of fuel efficiency, power, and torque in a 110cc automatic motorcycle.

Perancangan Kalkulator Elemen Mesin untuk Perencanaan Poros

2025-06-26T09:06:10+07:00

To design a transmission shaft requires quite complicated calculations, the calculation time is also quite long and the calculations must be careful because they are done manually, as has been done so far. The calculation results must also be accurate because the size of the shaft that does not meet the requirements can result in failure. To meet these needs, calculations in shaft design can be done with a tool, namely a software application that is run on a computer. The purpose of this study is to produce a software application or machine element calculator for shaft planning using the Matlab GUI, and to increase the efficiency of shaft planning in terms of time. This machine element calculator is designed by selecting the Matlab GUI menus according to the calculation formulas for the torsional load shaft diameter, namely Edit Text, Static Text, Panel and Push Button. Then arrange and edit the GUI menus through the Property Inspector and create a program (Matlab Code) for calculating the shaft diameter through the Callback menu. With this calculator, calculations in transmission shaft planning can be accelerated, which is an average of 24.8 minutes faster than manual calculations, which is an average of 34.8 minutes.

Identifikasi Root Cause Produk NG Master Cylinder di PT X

2025-06-26T09:20:01+07:00

The braking system is a crucial component in vehicles, responsible for reducing speed or halting the vehicle safely. However, several technical issues, such as brake fluid leakage, can compromise braking performance. Leaks can occur in hydraulic lines, the master cylinder, or brake calipers, leading to reduced hydraulic pressure and ineffective braking. Other issues like wear on components, excessive heat causing fading, and corrosion or contamination of brake fluid further degrade braking performance. The master cylinder plays a vital role in converting mechanical pressure into hydraulic pressure to operate the brake caliper. Damages such as fluid leaks, wear, corrosion, or contamination can impair this function, increasing the risk of accidents. Factors contributing to failures include poor material quality, machine setting errors, and inadequate maintenance. Regular inspection and maintenance of these components are essential to ensure vehicle safety and optimal braking performance.

Analisis Aplikasi System Ai Robotnisasi pada Kualitas Permesinan Mesin CNC di PT Evergrown Technology Batam

2025-06-28T02:34:30+07:00

This study aims to analyze the application of Artificial Intelligence (AI) and robotization systems on the machining quality of CNC machines at PT Evergrown Technology Batam. The research focuses on two primary indicators of machining quality: surface roughness and product cylindricity, which were experimentally measured in a controlled laboratory environment. Additionally, production process efficiency was examined through indicators such as production time, production costs, defect rates, and tool wear. Data were collected from 25 observation units selected through purposive sampling and analyzed using a quantitative approach with the assistance of SPSS version 2.3. The analytical methods employed include descriptive statistics, simple linear regression, one-way ANOVA, and comparative analysis to evaluate pre- and post-implementation conditions of AI and robotization systems. The results indicate that the implementation of AI and robotization has a significant impact on improving machining quality and production efficiency, as evidenced by a significance value of p < 0.05. These findings suggest that integrating AI and automation into production processes is a strategic move for advancing modern manufacturing industries.

Perancangan Alat Pengolah Limbah Plastik Jenis PET (Polyethylene Terephthalate) Kapasitas 3 kilogram dengan Menggunakan Kompor Oli Bekas

2025-06-30T19:24:16+07:00

Plastic is one of the materials widely used in society, one of which is PET (Polyethylene Terephthalate) plastic. Plastic is basically formed from petroleum, so it can be returned to its original form by the pyrolysis process. The pyrolysis process converts organic material at high temperatures and breaking down into smaller molecular bonds. Research and design of pyrolysis have been extensively studied before, with variations in the types of plastic waste burned or the type of fuel used to achieve the optimal heating rate. The fuel used in previous studies included fuels such as charcoal, LPG gas, and bicket from certain waste. In this study, the combustion process uses a jet stove with used oil fuel so that automotive waste can be used as fuel. The design method used in the manufacture of this plastic waste processing tool is the Pahl & Beitz design method, which begins with identifying problems, developing and planning concepts until the required concept is selected. In this design, the results of the 3 kg capacity pyrolysis design were obtained with the main components, namely a reactor tube with specifications of ∅250 mm and a height of 320 mm, a smoke conductor pipe using a galvanized pipe type with ∅25.4 mm, a copper spiral condenser pipe with ∅1/4 in, a condenser tube with specifications of ∅230 mm and a height of 250 mm, a tool frame using 30 mm × 30 mm × 3 mm angle iron made of carbon steel. In testing using Computational Fluid Dynamics simulation in the Solidwork application, a smoke temperature of 400 ℃ was obtained.