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All Journal TEKNIK Jurnal Teknik Mesin Community Development Journal: Jurnal Pengabdian Masyarakat Suara Teknik : Jurnal Ilmiah International Journal of Industrial Innovation and Mechanical Engineering Majalah Teknik Mesin
Apri Rahmadi
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Humanities Astronomy Automotive Engineering Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health

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STUDI KOMPARASI PERUBAHAN TIPE KARBURATOR TERHADAP UNJUK KERJA MESIN MOBIL MATARAM PROTO Rahmadi, Apri
Jurnal Teknik Mesin Vol 2, No 1 (2014): Edisi Desember 2014
Publisher : Jurnal Teknik Mesin

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Abstract

This research done to determine the effect of changes in the type of carburetor on the engine performance Mataram Proto. Proto Mataram car is energy-efficient three-wheel vehicle made for the purpose of energy-saving vehicles competition. In this study, the two carburetor is used, the first is Keihin carburetor venturi diameter of 16 mm and the second is the carburetor carburetor venturi Honda GX35 with a diameter of 8 mm. This research was conducted in the automotive laboratory, Institute of Science & Technology AKPRIND Yogyakarta.Testing the engine performance and exhaust emissions done twice, first using 16mm Keihin carburetor and the second using a carburetor Honda GX35. Both tests are done at 2000 rpm up to 6000 rpm interval 500 rpm intervals and retrieval of data in the form of power, torque, fuel consumption and exhaust gas emsisi done at the same time on each test.The result is the use of carburetor Honda GX35 lower the average power of 3.47%, 3.43% torque, specific fuel consumption by 14.2%, CO by 28.96%, and 21.02% for HC . However, there was an average increase in the concentration O2and CO2 respectively 35.71% and 0.75%.
Prototype of Laboratory Scale Centrifuge for Gum Crude Palm Oil (CPO) Separate Solehudin An Nur; Mursalin Mursalin; Rahmadi, Apri; Irawan, Doddy; Julianto, Eko
International Journal of Industrial Innovation and Mechanical Engineering Vol. 2 No. 1 (2025): February: International Journal of Industrial Innovation and Mechanical Enginee
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/ijiime.v2i1.117

Abstract

This study concentrates on the design and construction of a laboratory-scale centrifuge for the separation of gum from crude palm oil (CPO). The extraction of gum from CPO is essential in the palm oil sector to guarantee that the finished product adheres to quality standards and is safe for consumption. We engineered the prototype centrifuge to accommodate six 600-mL bottles and achieve a maximum rotational speed of 1400 rpm. The design procedure utilised Autodesk Inventor software for CAD modelling and computations to ascertain the centrifugal force, power capacity, and shaft diameter. The process of manufacturing entailed cutting and shaping stainless steel into the necessary components, subsequently followed by drilling and milling operations for mounting points and interfaces. We implemented surface treatment to augment corrosion resistance and elevate visual appeal. The assembling procedure encompassed component integration, motor incorporation, and control system configuration. The experimental configuration involved centrifugal testing utilising 600-mL glass bottles with time intervals of 10, 20, 30, and 40 minutes at an average rotational speed of 924 rpm. The experiment showed that the centrifuge worked well to separate the gum and other contaminants from the CPO. The best separation happened after 40 minutes of centrifugation.
Comparison of Standard, Tubular, and Banana Swing Arm Designs for Converting Scooter-Type Motorcycles into Electric Vehicles Rahmadi, Apri; Mursalin, Mursalin; Ahmad Bustami, Riyan
TEKNIK Vol 45, No 3 (2024): December 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i3.60146

Abstract

The percentage of motorcycle population in Indonesia reaches 82% of the total number of motorized vehicles. Almost all of these motorcycles are gasoline-powered vehicles, which ultimately consume a significant amount of fossil fuels and contribute to approximately 5% of greenhouse gas emissions. In addressing this issue, the government is promoting a motor vehicle electrification program. Motorcycles are predominantly automatic scooter types, presenting a significant opportunity for the vehicle electrification program. This research aims to design a swing arm used in converting automatic scooter-type motorcycles into electrically powered ones. In this study, three different swing arm designs were created: standard type, tubular type, and banana type. Stress analysis was conducted on these three swing arms under a load of 180 kg. The results indicate that the banana-type swing arm is the best design due to its superior strength and lighter weight. The designed banana swing arm has a weight of only 4.37 kg, experiences von Mises stress of 73.58 MPa, displacement of 0.46 mm, and a safety factor of 2.81
DESIGN AND ANALYSIS OF CHASSIS FRAME FOR CHOPPER-STYLE MOTORCYCLE Rahmadi, Apri; Mursalin, Mursalin
Media Mesin: Majalah Teknik Mesin Vol. 25 No. 1 (2024)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v25i1.3224

Abstract

Other than being a means of transportation, motorcycles represent a lifestyle for automotive enthusiasts. One way these enthusiasts express their passion is by customizing motorcycles. One common modification involves altering the motorcycle's original form, known as a custom-built motorcycle. There are several types of custom-built motorcycles, including cafe racers, street trackers, scramblers, bobbers, and choppers. Of these types, chopper-style motorcycles typically use a frame chassis which is built from scratch. This research aims to design and analyze the frame of a custom chopper-style motorcycle. The process involves creating a 3D model and analyze the strength of chassis frame using the Finite Element Method (FEM) by using Autodesk Inventor Professional 2022 software. The engine mass supported by the frame is assumed to be 30 kg. The frame is assumed to be ridden solo and with a passenger, resulting in total rider weights of 70 kg, 90 kg, 140 kg, and 180 kg. The result of this research is a chopper motorcycle frame design made of steel, weighing 11.74 kg, capable of supporting a rider's load of up to 140 kg, with a safety factor value of 3.20.
HYDROGEN GAS PRODUCTIVITY FROM PEAT WATER ELECTROLYSIS WITH DISTILLED WATER INJECTED INTO AN INTERNAL COMBUSTION ENGINE (ICE) Julianto, Eko; Binyamin, Binyamin; Gunarto, Gunarto; Rahmadi, Apri; Iwan, Muhammad
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 1 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i1.5419

Abstract

Hydrogen gas is one of the alternative fuels that is currently being widely researched. HHO generator is a tool with the working principle of water electrolysis and is used to produce hydrogen gas. In some studies, peat water has been considered to be used as an electrolyte. This research uses experimental methods to obtain hydrogen gas results from peat water electrolysis. The electrolysis reactor used can handle as much as 400 ml of peat water. The electrodes are stainless steel (SS) with a large cross-sectional area of 0.01884 m2. The electric power used was 12 Volts DC and the time in the electrolysis process was 1 minute. Based on the results of the research that has been done, among others, where the increase in HC in the exhaust gas in Aquades water looks very efficient at the initial rotation at 2000 rpm which produces a thermal efficiency of 60% While in peat water the increase in HC in the exhaust gas in Aquades water looks very efficient at the initial rotation at 2000 rpm which produces a thermal efficiency of 90%. The influence of rpm and the unstable rotation of rpm causes the CO value in the exhaust gas of the vehicle to be unstable where at low rotation readings 223. 24 ppm, middle 634.94 ppm and top 606.89 ppm, it can be seen that in the upper round the value even decreases from the middle round, while in HHO peat water when the low round reading is 104.4 ppm, middle 101.94 ppm and top 121.29 ppm, it can be seen that in the upper round the value increases from the initial round to the top.
Perancangan Mesin Screw Press Kelapa Sawit Dengan Kapasitas 150 Kg/Jam Mursalin, Mursalin; Rahmadi, Apri; Iwan, Muhammad; Julianto, Eko
Suara Teknik : Jurnal Ilmiah Vol 14 No 2 (2023): Suara Teknik: Jurnal Ilmiah
Publisher : Fakultas Teknik UM Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29406/stek.v14i2.6233

Abstract

Penelitian ini bertujuan untuk merancang mesin screw press untuk pengolahan kelapa sawit menjadi minyak CPO ( Crude Palm Oil) dengan cara melumatkan dan pengepresan buah sawit yang sudah disteam dalam bentuk brondol buah. Mesin ini dirancang untuk meningkatkan efesiensi ekstraksi minyak kelapa sawit pada skala kecil, khususnya untuk pengusaha lokal dan petani sawit mandiri. Metode perancangan melibatkan studi literatur Pemilihan bahan , perhitungan komponen mesin, perancangan konsep desain mesin  mesin screw press. Pada tahap awal, dilakukan pemahaman mendalam terhadap proses ektrasi minyak sawit secara umum dan karakteristik bahan baku yang diolah. Berdasarkan pemahaman tersebut dikembangkan konsep mesin Screw Press yang mampu menghasil CPO. Rancangan yang dihasil : spesifikasi  mesin  screw  press (PxLxT) 175x51x111 (cm) Dengan kapasitas pengolahan 150 kg / jam, daya mesin penggerak sebesar 8 HP, rasio Transmisi V-Belt Dan Pulley 3:1, Rasio Transmisi Gear box Speed Reducer 20: 1, rasio Transmisi total sebesar 60:1, diameter Poros  31,75 mm, Diameter Screw 100 mm, pitch Screw 80mm, Panjang screw 554 mm, diameter luar (OD) rumah Screw 114,3 mm (Sch 40, Ø 4 inch),diameter dalam (iD) rumah Screw 102,26 mm, tebal Screw 10 mm. 
PEMANFAATAN TEKNOLOGI BIOFILTER ANAEROB - AEROB SEBAGAI INSTALASI PENGOLAHAN AIR LIMBAH (IPAL) PADA KLINIK PRATAMA PKU ‘AISYIYAH SINTANG Mursalin, Mursalin; Rahmadi, Apri; Hudzaifah, Yasir; Susilo, Joko
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 5 No. 5 (2024): Vol. 5 No. 5 Tahun 2024
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v5i5.35990

Abstract

Pengabdian masyarakat ini bertujuan untuk membuat instalasi pengolahan air limbah (IPAL) di Klinik PKU Pratama "Aisyiyah Sintang" dengan menggunakan teknologi biofilter anaerobik-aerobik. Pertama, limbah cair dari klinik Pratama ditandai dengan penentuan kualitas air limbah yang harus diolah. Kemudian, teknologi biofilter anaerobik-aerobik digunakan untuk membangun instalasi pengolahan air limbah (IPAL). Proses aerobik mengoksidasi sisa senyawa organik menjadi produk akhir yang lebih aman, sedangkan proses anaerobik menguraikan zat organik kompleks menjadi senyawa yang lebih sederhana. Metode pelaksanaan pengabdian ini diawali dengan observasi permasalahan di Klinik PKU Pratama "Aisyiyah Sintang", pengembangan dan pembuatan alat teknologi praktis, sosialisasi dan uji coba alat yang dibuat. Media drum plastik digunakan dalam sistem instalasi untuk mengumpulkan dan mengolah air limbah. Dengan menggunakan teknologi biofilter anaerobik-aerobik sebagai instalasi pengolahan air limbah (IPAL) di Klinik Pratama PKU "Aisyiyah Sintang" diharapkan limbah dapat diolah dengan baik sehingga dapat membantu menjaga kebersihan lingkungan dan kesehatan masyarakat sekitar.
Co-Authors Ahmad Bustami, Riyan Binyamin Binyamin, Binyamin Doddy Irawan Eko Julianto Gunarto Gunarto Iwan, Muhammad Joko Susilo Mursalin . Solehudin An Nur Yasir Hudzaifah