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All Journal Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Dharmakayana: Journal of scientists, engineers, educators and scientific activists related to society development
Yovan Witanto
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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PELATIHAN TEKNIK PENGELASAN BAGI MASYARAKAT USIA PRODUKTIF UNTUK PRODUK REAL ESTATE, KANTOR PEMERINTAHAN DAN PELAYANAN MASYARAKAT Anizar Indriani; Yovan Witanto
DHARMA RAFLESIA Vol 13, No 2 (2015): DESEMBER
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v13i2.4246

Abstract

Welding process become a major part for small and large industries. Large industries using welding processes for cutting process plates, connecting plates, connecting pipelines and other components of the repair process. For small industries, welding process is used to maintenance and repair the automotive components industry that damaged, the manufacture of household appliances, office or public billboards. The demand for the product  of the welding process is increasing depend of area developing such as for home appliances, office or public billboard is very high demand due to the increase of residential property, real eastate, development and other areas of the city. The demand of the welding process product can not much utilized in Central Bengkulu district, where orders for the manufacture of a product housing, offices or billboards only mastered by a few workshops. High demand, the availability of garages or welding industries is few that make employment opportunities are very high. But this demand needs to be supported by human resources capable of using a welding machine. In this community service given basic training in welding techniques to help people in Central Bengkulu especially Talang Empat and Taba Terunjam in exploiting existing this opportunities. Training provided is use of the welding machine to make a trellis, fence or a seat with the type of welding machine capable of TIG or MIG welding. The results of welding training shows that people who can not follow the formal and informal education has a high desire for this training. This is to improve they skill, economy and living standards by utilizing the welding knowledge to create new jobs or working with existing workshops. Keywords: Fence, Trellis, Welding, Productive Age, Training  
MAINTENANCE KERUSAKAN CHECK VALVE POMPA DRAINAGE PUMP Ariska Purnama; Yovan Witanto; Afdhal Kurniawan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2023): Oktober 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v7i2.34065

Abstract

A drainage pump function is to pump water from the sump pit to the tail race. The drainage pump has a check valve to operate optimally. A check valve is a type of valve used in a piping system to prevent backflow, contamination between fluids, and isolating low-pressure areas or systems from high-pressure ones. One of the problems is the occurrence of blockages which result in damage to the check valve on the drainage pump. The purpose of this obsevation is to be able to find out the corrective maintenance process on the check valve in the Tes's Hydroelectric Power Plant, and to find out the effect of check valve damage on the reduction of electric power in the Hydroelectric Power Plant generator unit. At the time before maintenance was carried out on the check valve of the drainage pump, it made a decrease in electric power, thus corrective maintenance was carried out on the check valve on the drainage pump to maximize the electric power from the generator unit.
ANALISA KOEFISIEN UJUK KERJA MESIN PENDINGIN (CHILLER) UNIT 1 PADA POWER HOUSE Julianto Sinaga; Yovan Witanto; Agus Nuramal
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25454

Abstract

Each refrigerant has different characteristic properties which affect the refrigeration effect and the resulting coefficient of performance (COP). A refrigeration machine that works by cooling water is called a refrigeration machine chillers. Chiller is an air conditioner with no cooling system direct. In this indirect cooling system, the refrigeration engine does not instantly cools the air in every room. Refrigeration machine cools water demin first, then this cold demin water is used for cool the air in the room. Cold demin water as cooling medium to reduce the temperature of a wide room at power house (PH) PLTA Musi. The method used in working on this practical work report is:by making observations or observations in the field, conducting interviews (interview) with supervisors and practical work supervisors regarding theoretical data (specification data). In this study, the Cooling Performance Coefficient (COP) was analyzed On Power House (PH) PT PLN (PERSERO) UL PLTA Musi The results of this study get the conclusion, namely: The coefficient of performance (COP) on the machine chiller unit 1 in Power House PLTA Musi by 4.22 is smaller than specification coefficient. This indicates that the cooling system is working properly optimal.
PENGARUH VARIASI INFILL DAN SPEED PRINTING TERHADAP SIFAT MEKANIK ADDITIVE MANUFACTURING Fernando Desfriandi Saragih; A. Sofwan FA; Yovan Witanto
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25459

Abstract

Additive Manufacturing (AM) is a production process that does not remove or remove some of the material in the production process but adds material. The added material is extruded by means of Fused Deposition Modeling (FDM) technique. The way it works is to create a number of layers or layers one on top of the other. The software application used is Inventor to create 3D models in the form of STL files. Then the STL file is opened in the Ultimaker Cura (UC) application, to create a Numerical Code in G-Code which is used as a control on a 3D printing machine. The filler material used to produce molds is Polylatic Acid (PLA). PLA filament is very widely used in the manufacturing process, because this PLA can produce strong and very neat prints. The general print temperature of PLA is between 180oC to 220oC. The purpose of this test is to find out the steps for implementing the AM process and to analyze the mechanical properties of the AM product using the FDM technique. In this study, the printed material was based on ASTM D638 type IV. This research was conducted to determine the effect of variations in infill and printing speed on printed results, with a horizontal orientation of the printing angle of 0o. The infill variations are line infill and concentric infill with printing speeds of 50mm/s and 60mm/s. The research procedure is to make a 3D printing model, the manufacturing process, and the testing process. The results showed that the choice of infill and speed printing variations had an effect on the mechanical properties. The mechanical properties of printing products differ according to the mode and speed. The infill line mode provides greater mechanical strength than that produced in concentric infill. At a speed of 60 mm/s, the product strength of the infill line mode is 32.5 MPa greater than the 27 MPa strength of the printed product from the concentric infill mode.
Technology Transfer of Compost Briquette Production from Household Organic Waste in Sawah Lebar Baru Sub-District: Alih teknologi pembuatan briket kompos dari limbah organik rumah tangga di kelurahan sawah lebar baru Yovan Witanto; Agus Nuramal; Helmizar
Dharmakayana Vol 2 No 1 (2025): Mei : Dharmakayana: Journal of scientists, engineers, educators and scientific ac
Publisher : Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dk.v2i1.41604

Abstract

Compost produced by economically non-productive residents in Sawah Lebar Baru Subdistrict has remained underutilised, leading to accumulation and limited economic benefit. This community service activity aimed to introduce Seed Briquette Technology as an innovative solution to enhance the value and usability of household compost. The programme involved knowledge dissemination and hands-on training on how to produce seed briquettes using existing compost. The compost was compacted into Soil Blocks—pressed blocks with a central hole—using a manual moulding tool. This tool was introduced and distributed to local residents during a technology transfer session conducted by the Faculty of Engineering in RT 29. The participants responded with strong interest and demonstrated the ability to apply the technique successfully. Community members were able to convert their compost into functional seed briquettes, showcasing both skill development and successful adoption of the technology. As a result, the participants gained valuable technical skills which are expected to support future income generation. The activity highlights the potential of simple, locally adapted technologies to improve waste management and economic empowerment in urban communities.  
Co-Authors A. Sofwan FA Afdhal Kurniawan Agus Nuramal Anizar Indriani Ariska Purnama Fernando Desfriandi Saragih Helmizar Julianto Sinaga