R.E.M. (Rekayasa Energi Manufaktur) Jurnal
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Analysis of Damage to the Induce Draft Fan Component at PLTU PT. XYZ
Full text linkDamage to the Induce Draft Fan (IDF), will impact to the combustion system which serves to provide Secondary Air to meet the air needs of the combustion system in the furnace in the boiler. There are 2 IDFs in the generating unit which are operated simultaneously or alternately. The purpose of this research is to determine the damage to the IDF so that there is no decrease in power supply to PLN generators. The method used in this study used fishbone analysis. Based on the analysis, the IDF damage occurs due to abrasion on the fan blade which is caused by the blade surface in contact with the abrasive material (Fe2O3) on the flue gas. The malfunctioning of the Electrostatic Precipitator (ESP) causes the abrasive material (Fe2O3) in the flue gas to not flow to the IDF, thus damaging the blad
Chemical Modification of Petung Bamboo Fiber to Hybrid Composites: Modifikasi Kimia Serat Bambu Petung terhadap Komposit Hibrida
No full textThis study evaluates the effect of alkali treatment using NaOH solution on the mechanical properties and microstructure of hybrid composites based on epoxy resin reinforced with petung bamboo fiber and fiberglass. Bamboo fibers were immersed in five NaOH concentration variations (0%, 3%, 6%, 9%, 12%) before composite fabrication using the hand lay-up method. Tensile testing was performed according to ASTM D-638 standard and microstructural characterization using Scanning Electron Microscope (SEM). The results showed that 9% alkali treatment produced the best mechanical performance with a tensile strength of 58.68 MPa, elongation of 4.15%, and elastic modulus of 1413.49 MPa. SEM analysis indicated improved fiber-matrix adhesion due to removal of lignin and hemicellulose. Optimal alkali concentration enhanced composite performance, making it a potential candidate for eco-friendly vehicle interior applications
The Effect of Variations in the Composition of Cocoa Shell Charcoal and Peanut Shell Charcoal on Briquette Characteristics
Full text linkAgricultural biomass such as cocoa husks and peanut shells have great potential as raw materials for briquettes to support the provision of sustainable alternative energy. This study aims to evaluate the effect of variations in the composition of these two materials on the characteristics of briquettes, including calorific value, moisture content, ash content, and burning time. The study was conducted using a completely randomized design (CRD) with five treatment compositions (KC1=100:0, KC2=70:30, KC3=50:50, KC4=30:70, KC5=0:100) and three replications. Data were analyzed using Analysis of Variance (ANOVA), and if significant effects were found, the analysis was continued with Duncan’s Multiple Range Test (DMRT) at the 5% level. The results showed that a high proportion of cocoa husk resulted in higher moisture content (15.78%) and lower calorific value (3867 kcal/g), while a high proportion of peanut husk increased the calorific value to 5340 kcal/g and burning time to 84.8 minutes, but was accompanied by higher ash content (17.57%). The balanced mixture of KC3 (50:50) and KC4 (30:70) proved to offer the best compromise, with moisture content <10%, calorific value >4400 kcal/g, burning time >78 minutes, and ash content still within an acceptable range. Thus, although pure peanut shell briquettes (KC5) offer the highest performance, the combination of KC3 and KC4 is more worthy of consideration for improving briquette quality while optimizing the utilization of abundant cocoa shell waste. 
Design and Build Prototype of Field Soil Shear Test Equipment: Perancangan dan Pembuatan Prototipe Alat Uji Geser Tanah
No full textShear strength analysis testing is a fundamental test in the field of civil engineering. The shear strength of the soil is greatly influenced by the parameters present in the soil, the higher the value of the obtained parameters, the higher the soil strength. To obtain these parameters, we need to conduct one of the soil shear strength tests. The soil shear test that has been conducted in the laboratory involves taking soil samples from the field, transporting them, and then conducting the tests. During the journey from the field to the laboratory, it is highly likely that the sample will undergo changes due to vibrations, shaking, or temperature. Some innovations that have been implemented weigh a maximum of 10kg, are portable and easy to carry, produce accurate test results, and are tested directly in the field. The design of the tool is made in a prototype before the assembly of the tool. The design of the direct shear test tool is made by referring to the standardized testing principles. After the device is assembled, a test is conducted on a soil sample using the standard procedure of the shear test apparatus
Simulation of Waste Load Variations on Stress Analysis Results of Incinerator Wheel
Full text linkAn incinerator is a high-temperature waste-burning device with a closed, insulated combustion chamber, designed to minimize environmental impact [1]. Modern incinerators aim to reduce inorganic waste and smoke emissions, particularly in Metro City, Lampung Province [2]. A key component is the wheel, which reduces friction and enhances mobility [3]. This study focuses on designing the incinerator wheel, determining its geometry and material, and analyzing stress, strain, and deformation through simulation [4]. The design process used Autodesk Inventor Professional, while simulations were performed in SolidWorks [5]. Tests were conducted under three load conditions: no load, 250 kg, and 500 kg. The final wheel design measures 150 mm in diameter, 50 mm in width, and 10 mm in thickness, using cast iron. Simulation results show stress, strain, and deformation remain below material limits, even at 500 kg load, confirming the wheel’s safety and reliability for optimal incinerator performance
Analysis of the Effect of CVT Spring Variation on the Performance of Beat Deluxe Motorcycles
No full textAutomatic motorcycles are popular due to their efficiency and flexibility in urban areas. CVT spring modifications are often done to improve performance. This research tested the effect of 1000 RPM (standard), 1500 RPM, and 2000 RPM CVT springs on a Beat Deluxe using a dynotest, observing torque, power, fuel consumption, CVT wear, and engine temperature on 68 kg and 134 kg riders. The results showed that at 3000 RPM, the highest torque was achieved by the 2000 RPM spring (14.04 Nm for 68 kg, 12.84 Nm for 134 kg). The highest power at 4000 RPM was also by the 2000 RPM spring (6.6 HP for 68 kg, 5.9 HP for 134 kg) but with the highest fuel consumption (0.021 l/km for 68 kg, 0.030 l/km for 134 kg). The 1500 RPM spring showed a moderate performance increase with wear and temperature between the 1000 RPM and 2000 RPM springs. The 1000 RPM spring produced the lowest temperature (76.5 ℃), followed by 1500 RPM (79.7 ℃) and 2000 RPM (84.1 ℃), indicating a correlation between spring stiffness and operating temperature
Optimization of Packaging Design for Bumbu Pecel Putri Srikandi Using the Quality Function Deployment (QFD) Method
Full text linkMicro, Small, and Medium Enterprises (MSMEs) play a vital role in the Indonesia economy, contributing over 60% to GDP and employing nearly 97% of the workforce. Competitiveness can be improved through packaging that protects product, strengthens brand identity, and attracts consumers. Putri Srikandi, a traditional peanut sauce (bumbu pecel) producer, still uses simple plastic packaging, limiting its market appeal. This study redesigns the packaging using Quality Function Deployment (QFD) through House of Quality (HoQ) to translate consumer preferences into technical specifications. Data from 112 respondents identify 13 key attributes, with readable font color (A3) and eco-friendly packaging (A5) scoring the highest (4.13), while attractive packaging design (A1) and hygiene (A12) scored the lowest (3.96). Benchmarking shows the product underperforms compared to competitors. HoQ analysis produces 13 technical responses, with top priorities are clear producer information (A6, RW = 7.75; NRW = 9%), and brand/logo visibility (A8, RW = 7.71; NRW = 8%). The final design integrates modern aesthetics, local identity, spiciness-based color coding, and eco-friendly materials to enhance competitiveness and consumer trust
Efficiency and Electrical Power Consumption of Prototype-2 Gasification Stove Fueled by Used Cooking Oil
Full text linkAbstract. Currently, society and the business still rely on 3 kg and 12 kg LPG gas stoves for cooking. And the supply of LPG in Indonesia is 6.7 million tons, or about 77%; it is still imported from abroad. On the other hand, used cooking oil (Used Cooking Oil/UCO) produced in Indonesia is around 1.2 million kiloliters per year, which proves that Indonesia has a fairly abundant supply of used cooking oil. This used cooking oil, if still used for frying, can be harmful to health, and if disposed of in the environment, will pollute water and soil. Therefore, an innovation arose to create a gasification stove by utilizing waste-used cooking oil that is no longer used as fuel for the stove as a form of appropriate technology that is sourced from renewable energy that is environmentally friendly. This study aims to analyze the efficiency of used cooking oil stoves using the Water Boiling Test (WBT) method, where testing and analysis were carried out using 3 samples of 1 liter of water volume. The test and analysis results showed that the average thermal efficiency was 54.4%, exceeding the minimum requirement of 50%, according to the SNI 8660:2018 standard. The average Fuel Consumption Rate (FCR) value was 0.44 liters/hour, and the average input power (Pin) was 3.58 kW, exceeding the average input power for LPG gas stoves of 2.37 kW. Meanwhile, the electrical power required to operate the stove was 430.1 Watts
Windshield Damage Analysis on ATR 42/72-600 Aircraft at PT. DEF
Full text linkWindshield damage on ATR 42/72-600 aircraft at PT. DEF has caused operational disruptions, including flight delays, increased maintenance costs, and potential safety risks. Repeated damage to the Windshield is caused by various factors, namely inspection and maintenance errors, improper installation procedures, damage to the heating system or pressure distribution, glass material degradation, and exposure to extreme weather and UV rays. In this study, the analysis was carried out using a quantitative method with a fishbone diagram to identify the main causes of damage and appropriate mitigation steps. The results of the analysis showed that the main factors contributing to the damage were errors in inspection, installation errors, and material degradation. After implementing mitigation steps such as improving technician training, revising maintenance procedures, and improving material selection, there was a significant decrease in the frequency of Windshield damage. An indication of the success of these mitigation steps can be seen from the repairs carried out during January to June 2024 which succeeded in reducing damage and rejects on the Windshield by 40% compared to 2023, improving the quality of maintenance, inspection and material durability. In terms of maintenance costs for spare parts, there is a decrease in spending on purchasing spare windshields, namely USD 15,375 (PPG Inc.) x 10 units = USD 153,750 in 2023 to USD 21,915 (Saint Gobain) x 3 units = USD 65,745 in 2024 (June), which is 42% until mid-2024. This step increases operational reliability, cost efficiency, flight safety, and employee productivity, customer satisfaction also increases along with reduced flight delays and cancellations due to technical problems. Overall, the study succeeded in reducing Windshield damage and increasing the company's operational efficiency and reliabilit
Observe The Response a Finite Element Linear Static Analysis Simulation Was Conducted On The Fire Extinguisher Refill Frame.
Full text linkThe apar refill machine consists of several components so that the frame of the apparatus requires a strength analysis of the frame. The problem that arises to make a portable apparatus is that there are 2 main components that depend and 1 component that does not depend, so the purpose of this study is with the process of finite element linear static analysis, the results of the frame design can show the reactions that arise due to the existing load, whether the frame is safe to use or not. This research method begins with design, material input, mesh input, boundary condition input and force input. The results show that the reactions that occur are the highest stress of 18,882 N, disspacement 2,450E + 00 mm, strain of 8,182E-05 and safety factor 3,6383 + 12. From these results, according to the mechanical properties reference static linear threshold, the value is still safe at the maximum force threshold