Article Per Year (5 Year)
p-Index From 2020 - 2025
0.983
P-Index
This Author published in this journals
All Journal Teknik Mesin "TEKNOLOGI" INJECTION: Indonesian Journal of Vocational Mechanical Engineering
Hairian Rahmadi
Politeknik Ketapang, Kalimantan Barat
Control & Systems Engineering Economics, Econometrics & Finance Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

Published : 6 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 6 Documents
Search

 1 
Pengaruh Variasi Campuran Solar Dan Biodiesel Dari Minyak Jelantah Terhadap Sudut Injeksi Dan Dinamika Pembakaran Rahmadi, Hairian; Soeparman, Sudjito; Pratikto, .
Teknik Mesin "TEKNOLOGI" Vol 12, No 4 Okt (2010)
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The development of the world today that require the use of renewable energy as fuel non-renewable fossil fuels in particular. Because fossil fuels are declining in number, then needed alternative energy sources as a substitute fuels. As one alternative fuel is biodiesel which is often added in fossil fuels such as biodiesel mixed with diesel fuel. With increasing biodiesel in diesel fuel will increase nilat viscosity, increasing the value of the viscosity of biodiesel in diesel fuel injection will allegedly spreading angle narrows and the dynamics of combustion is expected to affect the dynamics of combustion. This research was conducted with a mix of diesel fuel and biodiesel, with a mixture of 0 *, 20, 40, 60, 80, 100% biodiesel, tested using agricultural machinery YANMAR brand with 10.5 bar pump injector, nozzle 7.5 bar with a diameter of 1 mm , using a dynamo to drive a knock-as to pump injection pump. Angle spread, the dynamics of combustion using a video camera. The results showed that the angle spread narrowed as the increasing percentage of biodiesel in diesel fuel ie from 13.650 to 12.370 on pure biodiesel. fire and high velocity will increase with the addition of biodiesel in diesel fuel. High growth speed of the fire and flames on the percentage of  biodiesel blend showed the highest high-fire reached with kecepatan 101 cm, 1,3 cm / s, which approximates the high heat and speed of the diesel fuel fire that reached 95 cm and a speed of fire 1.2 cm / sec. Keywords: Biodiesel, diesel fuel, angle of injection, combustion dynamics.
PENGGUNAAN KARBON ARANG KAYU BELIAN DAN ARANG KAYU AKASIA PADA PROSES KARBURASI PADAT BAJA KARBON RENDAH Fajar Setiawan, Bayu; Helanianto, Helanianto; Rahmadi, Hairian
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 1 No 1 (2021)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v1i1.1347

Abstract

Low carbon steel has a wide use in the construction sector and is classified into steel that can be processed by machinery (machinery steel). The salient disadvantage of this material is the type of failure in the form of chipping, and breaking. The purpose of this study was to determine the effect of the addition of belian and acacia wood charcoal on low carbon steel. This solid carburizing process uses a mixture of belian wood charcoal with calcium carbonate and acacia wood charcoal with calcium carbonate, and heattreatment at a temperature of 900oC, holding time of 30 minutes followed by quenching, with the Rockwell hardness test method. The test results show that the hardness of carbon steel that undergoes treatment is higher when compared to raw material of low carbon steel = 50.34HRB, where carburizing with acacia wood charcoal = 50.5HRB with a lower value when compared to belian wood charcoal = 50.94HRB. Judging from these results, the solid carburizing process with different types of charcoal will increase the hardness of low carbon steels.
PENGARUH PERBANDINGAN CAMPURAN 50% LIMBAH SAWIT DAN 50% KOTORAN SAPI TERHADAP PROSES TERJADINYA BIOGAS Rahmadi, Hairian
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 1 No 1 (2021)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v1i1.1350

Abstract

This gas comes from the mixing of liquid waste oil and cow dung, liquid waste oil and animal waste into energy that can be utilized through the process of anaerobic digestion. Making biogas from waste oil, especially oil and cow effluent has the potential as an environmentally friendly alternative energy, because in addition to utilizing waste oil and cattle, the rest of the biogas production in the form of slurry can be used as organic fertilizer rich in elements which are needed by plants. biogas very much. The purpose of this study was to determine the effect of mixing liquid waste oil and cow dung on the length of time the process of biogas and the color of the flame. Testing of this study using a gouge and medium pressure gas stove. In the biogas test results on day 10 but not significant, after day 15 to 20 days there was an increase in the reaction to the occurrence of biogas. For the color of the flame produced, the color of the flame was blue.
PROSES KARBURASI PADAT PADA BAJA KARBON RENDAH DENGAN TEMPERATUR 900 C, 1000 C, DAN 1100 C Helanianto, Helanianto; Rahmadi, Hairian
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 3 No 1 (2023)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v3i1.1489

Abstract

This study aims to determine the effect of temperature on the solid carburizing on increasing the hardness value of ST37 steel. This solid carburizing uses temperature variations of 9000C, 10000C and 11000C, with a holding time of 30 minutes. The material used is a mixture of CaCO3 and coconut shell charcoal with mineral water as a cooling medium. The test carried out was the Rockwell hardness test which was carried out in the Mechanical Engineering Materials Testing Lab of Politeknik Negeri Ketapang. From the test results for ST37 steel, the average hardness obtained in the raw material = 48.3 HRB, then in each carbonation treatment at a temperature of 9000C = 48.6 HRB, a temperature of 10000C = 48.9 HRB, a temperature of 11000C = 49.1 HRB. Carburized steel plates with a temperature of 9000C, 10000C and 11000C the test results are harder than the raw material.
PENGARUH VARIASI AIR SEBAGAI MEDIA PENDINGIN TERHADAP KEKERASAN HASIL PENGELASAN PADA BAJA ST- 37 Putra, Bagoes Handika; Rahmadi, Hairian; Nurmayasari, Dewi; Helanianto, Helanianto
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 3 No 2 (2023)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v3i2.1502

Abstract

This research will provide testing of low carbon steel, namely ST-37 Steel, through a welding process using cooling media with variations in water on the hardness of the steel resulting from welding. The important point in this research is to be able to determine the effect of the cooling medium on the hardness of the welded steel in order to obtain maximum hardness and obtain good weld hardness. Welding is carried out using the shielded metal ac welding (SMAW) welding method, so testing is required on test objects resulting from shielded metal ac welding (SMAW). The research method that the researcher took was an experimental research method, namely research to determine the consequences of the treatment given to the thing being researched by carrying out Rockwell Hardness (HR) testing. From the tests, differences were found in each specimen using 4 different water samples. The 4 water samples used were sea water, salt water, water with a pH of 6.1, and water with a pH of 7.4. Variations in cooling media influence the test results, namely at 10 specimen points tested from 4 cooling media samples, it was found that the specimen with the highest level of hardness was the specimen using a water sample with a pH of 6.1, namely with an average value of 49.3 (HR), and the specimen with the lowest level of hardness was the specimen with the salt water sample, with an average value of 46.95 (HR).
ALAT PEMOTONG PLAT SISTEM GESER Ismael Marjuki; Polonia, Betti Ses Eka; Rahmadi, Hairian
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 4 No 1 (2024)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v4i1.1671

Abstract

The process of cutting steel plates is often found in small and large industries. Cutting is also a process of separating and reducing one solid object into two or more that are directed, modifying, forming, and removing unnecessary parts using cutting tools. Some common problems when using a hand grinder are user safety from sparks and dust. In addition, physical injury factors due to misuse and broken discs or grinding wheels can also occur during operation. Based on this, the author designed a tool that can cut plates safely and neatly. This tool's advantage is that it is safer and more efficient because it uses a sliding system. A plate-cutting tool with a sliding system has dimensions of 126.5 cm frame length, 50 cm width, and 20 cm frame height. Process the plate-cutting tool frame using a hollow iron measuring 40x40 mm and a grinding machine with a speed of 12,000 rpm.
Co-Authors . Pratikto Fajar Setiawan, Bayu Helanianto, Helanianto Ismael Marjuki NURMAYASARI, DEWI Polonia, Betti Ses Eka Putra, Bagoes Handika Sudjito Soeparman