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Murtalim
UNIVERSITAS BUANA PERJUANGAN KARAWANG
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PENGARUH CAMPURAN BENSIN DAN MINYAK JAHE PADA GETARAN MESIN SEPEDA MOTOR Riyan Ariyansah; Murtalim; Adhes Gamayel; Ade Sunardi; Fitria Efendy
Jurnal Teknik Mesin Mechanical Xplore Vol 1 No 2 (2021): Jurnal Teknik Mesin Mechanical Xplore
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.13 KB) | DOI: 10.36805/jtmmx.v1i2.1391

Abstract

Motor bakar adalah suatu mesin knversi energi yang digunakan untuk alat transportasi yang banyak digunakan oleh berbagai lapisan masyarakat. Menyadari akan hal itu telah banyak dilakukan penelitian dan pengembangan untuk mengefesiensikan energi yang digunakan oleh motor bakar, salah satunya adalah pencampuran bahan bakar bensin dengan minyak jahe. Hal ini tentunya akan memberi hasil kinerja pada mesin tersebut. Penelitian ini dilakukan utuk mengetahui pengaruh pencampuran bahan bakar bensin dengan minyak jahe pada getaran mesin, torsi dan emisi gas buang pada kendaraan sepeda motor tersebut. Dengan variasi campuran minyak jahe 5 %, 10% dan 15% pada putaran mesin 1000 Rpm dan 2000 Rpm. Hasil penelitian menunjukkan bahwa semakin besar campuran minyak jahe maka semakin besar getaran pada mesin, torsi yang dihasilkan oleh mesin semakin rendah dan hasil emisi gas buang semakin tinggi
ANALISIS KINERJA EVAPORATOR PADA VAPORS COMPRESSION REFRIGERATION SYSTEM MENGGUNAKAN REFRIGERANT R410A Sukarman Sukarman; Khoirudin Khoirudin; Murtalim Murtalim; Ahmad Fauzi; Ricko Valderama; Amri Abdulah; Anwar Ilmar Ramadhan
Jurnal Teknologi Vol 14, No 1 (2022): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.14.1.127-138

Abstract

VCR system  is an energy conversion device that uses a mechanical vapour compression cycle in the process. The performance of the VCR system using environmentally friendly refrigerants is a significant issue, and much research is still underway to evaluate and improve the efficiency of the systems used. Therefore, this paper presents an experimental investigation of the performance of the refrigeration cycle. A VCR system was used as a test tool. The coefficient of performance (CoP) was studied using a VCR system  design with varying evaporator loads. Variation of an evaporator load is done by intervening fan rpm at five rpm levels. The VCR system uses a compressor with a capacity of 365 watts using R410A refrigerant. Refrigerant R410A is one of the alternative refrigerants to replace R22 which is not environmentally friendly. Experimental data was validated using Genetron Properties 1.1 software. Experimental analysis data showed that the highest CoP was obtained at the lowest rpm with a value of 3.17. Meanwhile, the lowest CoP is 3.02, obtained at the highest rpm. Loading the evaporator with fan rpm produces a CoP value indirectly proportional to the fan rpm value. Genetron 1.1 software validation results produce a higher CoP value of about 2%-3% than experimental data.
Analysis of Pressure Vessel Design on Radiator Cooling System Using Low Carbon Steel Material Nana Rahdiana; Sukarman Sukarman; Murtalim Murtalim; Khoirudin Khoirudin; Dodi Mulyadi; Amir Amir; Tito Chaerul Pratama; Ahmad Hidayat
Journal of Applied Sciences and Advanced Technology Vol 3, No 3 (2021): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jasat.3.3.81-90

Abstract

This study discusses the analysis of a pressure vessel's design in the Radiator Cooling 1000 (RC-1000) system, which operates at a design temperature of 100oC. A pressure vessel is a container of gaseous, solid, or liquid material subjected to internal or external pressure and can withstand various other load variations. The pressure vessel on the RC-1000 system has a diameter of 85.4 mm or 3.36 inches and will experience an internal pressure of about 143.7 kPa or 20.84 psi, so it must be designed safely. This research method uses analytical and experimental methods. The analytical method is used to calculate the thickness of the pressure vessel material, the maximum allowable working pressure, and the hydrostatic test calculation. While the experimental method was carried out on the hydrostatic test process, the evaluation was based on the prevailing regulations in the Republic of Indonesia. Using the SPCC-SD material (JIS 3141), it was found that the minimum thickness of this pressure vessel is 1.15 mm or 0.0452 inches on the shell side and 1.10 mm or 0.0434 inches on the head/dome side. The thickness of the material used on the shell side and head/dome is 1.2 mm or 0.0472 inches in practice. This pressure vessel has passed the hydrostatic test at 1600 kPa or 232.1 psi. The test pressure is given around seven psi higher because it makes it easier to read the scale on the pressure gauge.
An Energy Evaluation in a Vapor Compression Refrigeration System Utilizing R32 Refrigerant Hasanudin Hasanudin; Ananda Duta Suhendar; Amri Abdulah; Renata Lintang Azizah; Khoirudin; Karyadi; Murtalim; Abduh Al Afgani
Jurnal Teknik Mesin Mechanical Xplore Vol 3 No 2 (2023): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v3i2.3065

Abstract

This article reports the results of a study into the efficiency of refrigeration systems. The efficiency of the refrigerant-based cooling system is a significant issue due to its connection to global warming. Vapour compression refrigeration (VCR) systems utilise the inverted Rankine cycle to provide cooling process. Existing systems are evaluated and controlled, and their efficacy is either maintained or improved. A VCR device explores evaporator load variations at five different rpm levels as test equipment for measuring the performance coefficient of R32 refrigerant. A 365-watt compressor drives the VCR system. R32 is a more eco-friendly alternative to R22 as a refrigerant. Interpolation and extrapolation were utilized and adapted to convert the system's experimental enthalpy value to total performance. Genetron was chosen to evaluate enthalpy alongside other factors, such as VCR performance. Genetron properties was used to double-check the experiment's findings. The highest CoP was found and evaluated at a speed of 400 rpm (1st level) with the result about 3.17. The lowest value for CoP was found and achieved at the maximum attainable rpm, which was 2.53. The association between CoP and fan speed is inversely proportional during evaporator loading. Genetron properties software validation results produced an average CoP value of less than 10% compared to experimental data. In addition, this work significantly contributes to the study of VCR performance through the development of test devices for the provided VCR system
ANALISIS PENGARUH PROSES STRESS RELEIVING PADA MATERIAL BAJA STRUKTUR SETELAH PROSES PENGELASAN SMAW Murtalim Murtalim
Jurnal Teknik Mesin Mechanical Xplore Vol 1 No 1 (2020): Jurnal Teknik Mesin Mechanical Xplore
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (968.631 KB) | DOI: 10.36805/jtmmx.v1i1.1280

Abstract

Dalam suatu proses pengelasan logam yang dipanaskan akan memuai dan mencoba memaksa pelat terpisah, akan tetapi ditahan sampai sejumlah besar oleh bahan sekelilingnya yang dingin. Begitu las berlangsung logam las mulai berkontraksi dan mempengaruhi gaya-gaya penyusutan untuk menarik pelat bersama-sama. Gaya ini dikombinasikan dengan temperature yang tinggi dari logam yang berdekatan sehingga bahan menjadi mulur (yield) dan mengubah bentuk secara plastis pada daerah yang dipengauruhi panas (distorsi). Hal ini menyebabkan dimulainya tegangan dalam (internal stress) yang disebut tegangan sisa.. Tegangan sisa yang terjadi sangat mempengaruhi sifat dan kekutan dari sambungan, salah satu cara yang paling banyak diterapkan untuk mengurangi tegangan sisa adalah dengan perlakuan panas stress relieving. Penelitian ini dimaksudkan untuk mengetahui pembentukan tegangan sisa serta perubahan sifat mekanik. Hasil lasan dengan variasi parameter arus pengelasan, sehingga akan diketahui hasil pengelasan dengan parameter pengelasan yang tepat. Kata Kunci: pengelasan, tegangan sisa, sifat mekanik In a welding process the heated metal will expand and try to force the plates apart, but is held to a large amount by the cold surrounding material. As the welding progresses the weld metal starts to contract and influence the shrinkage forces to pull the plates together. This force is combined with the high temperature of adjacent metals so that the material becomes stretched and changes its shape plasticly in areas affected by heat (distortion). This causes an internal stress which is called a residual stress. The residual stress that occurs greatly affects the nature and strength of the joint, one of the most widely applied methods to reduce residual stress is by stress relieving heat treatment. This research is intended to determine the formation of residual stress and changes in mechanical properties. The results of welds with variations in the welding current parameters, so that the welding results will be known with the right welding parameters. Keywords: welding, residual stress, mechanical properties
Co-Authors Abduh Al Afgani Ade Sunardi Adhes Gamayel Ahmad Fauzi Ahmad Hidayat Amir Amir Amri Abdulah Ananda Duta Suhendar Anwar Ilmar Ramadhan Dodi Mulyadi Fitria Efendy Hasanudin Hasanudin Karyadi Khoirudin Khoirudin Khoirudin Nana Rahdiana Renata Lintang Azizah Ricko Valderama Riyan Ariyansah Sukarman Sukarman Tito Chaerul Pratama