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All Journal Rekayasa Mesin Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Sprocket : Journal of Mechanical Engineering Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Visi Pengabdian Kepada Masyarakat Dinamis Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Jurnal Polimesin
Richard A M Napitupulu
Program Studi Teknik Mesin Universitas HKBP Nommensen
Arts Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Transportation

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Simulasi CFD Distribusi Temperatur pada Pengering Biji Kopi dengan Sistem Konveksi Paksa Pasaribu, Humisar; Lumbangaol, Partahi; Napitupulu, Richard A.M; Siagian, Parulian; Siagian, Horas S; Setyawan, Eko Yohanes
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1214

Abstract

Drying is a mass transfer and heat transfer process that is strongly influenced by temperature and air velocity. The importance of analyzing the temperature distribution and air velocity is expected to be used as a reference to optimize the drying process to be faster and better. This study aims to analyze the temperature distribution and air velocity that occurs in a coffee bean dryer with a forced convection system using CFD simulation. CFD simulations are carried out using ANSYS Fluent software. with steady conditions, and using a pressure-based solver method. The obtained temperature distribution occurs with an estimated absorber temperature difference with the drying chamber is 31% during the day.
PENGARUH PARAMETER PEMESINAN TERHADAP KEKASARAN PERMUKAAN AI6061BE PADA PEMESINAN CNC MINI 500 WATT MENGGUNAKAN PAHAT KARBIDA STRAIGHT ENDMILL Napitupulu, Richard A. M.; Perangin angin, Siwan E.A.
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1812

Abstract

The role of automatic machining with the help of computer programming such as Computer Numerically Controlled (CNC) has become commonplace today in both large and small industrial sectors or micro industry. CNC is a manufacturing process where previously programmed computer software is converted into code that can automate machining movements, one of which is the milling or lathe process. CNC performance is determined by machining output power. For micro industrial or laboratory scale, CNC with low power is usually used to cut soft materials such as wood, acrylic, aluminum and others. This is the basis for this research to look at the influence of machining parameters such as speed, depth of cut and feed rate on the surface roughness (Ra) of AI6061BE aluminum workpieces in the dry machining process on a mini CNC unit with a maximum spindle power of 500 watts. This research uses an experimental design based on the Taguchi method and takes the form of an L16 (43)  orthogonal matrix. The chisel used is a Straight End Mill 2 fluke carbide chisel. The experiment was carried out 4 times cutting in the positive x-axis direction and 4 times in the negative x-axis direction for each variation of machining parameters. From the test results, surface roughness, feed rate is a parameter that is more influential than speed and depth of cut.
Experimental Test of the Effect of PCM Volume as Thermal Energy Storage Solar Power in Solar Cooking Units Napitupulu, Richard A.M.; Peranginangin, Siwan E.A.; Siagian, Parulian
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4266

Abstract

One solution that can be taken to reduce GHG emissions is to reduce consumption of fossil fuels and replace them with renewable energy sources. Indonesia is rich in renewable energy sources, and one that has potential to be developed is solar energy. In line with Indonesia's development into a developed country, energy consumption is increasing. One of the activities that contributes to the largest energy use is cooking. The need for energy for cooking in Indonesia is large because the population and households are very large, No. 4 in the world. Solar Cooker is an alternative to reduce the use of fossil or traditional energy for cooking activities. Previous research has shown how the performance of a Solar Cooker can be improved if it is integrated with PCM thermal energy storage, making it possible to speed up cooking time, cook with low solar intensity and even make it possible to cook at night. However, the quantitative influence of the number of PCMs in a solar cooker has not been specifically explained or studied. A low quantity of PCM results in reduced performance, while a high quantity will increase the thermal load, and thus overheating. This research tested 4 units of Simple Tube type Solar Cooker with different quantities of PCM for each unit. From the results of testing the Solar Cooker with the PCM thermal Energy Storage TEST with variations in PCM volume, it showed performance in storing heat for longer even in conditions of high rainfall day and night conditions. This is shown from all observation results during the 6 days of the experiment. As evidenced by the low ambient air temperature and high humidity, especially at night, the temperature drop in the cooking vessel water is quite low. This applies to every variant. From the experimental results, it can also be seen that variants number 1 and 3, especially number 3, have quite good performance, in absorbing heat and storing heat with an outer diameter of 350 mm
The Effect of Machining Parameters of Water Surface Tool Wear 6061be on 500 Watt Mini Cnc Machining Using Straight Endmill Carbide Tool With the Taguchi Method Napitupulu, Richard; Perangin Angin, Siwan; Voice Sihombing, Hendrik
DINAMIS Vol. 12 No. 2 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i2.18697

Abstract

In today’s world in the manufacturing sector, turning plays a vital role among all other cutting methods. The cutting technique of the material is one of the important things that determine the quality of the product, while the cutting parameters and conditions also play an important role in the machining process. Selecting effective cutting condition parameters is very important to ensure product quality, extend tool life, reduce production costs, reduce carbon emissions, and improve production efficiency. In the turning operation of CNC Router 3 Axis Mach 3, machining parameters and tool geometry play an important role, Optimization of machining parameters increases the economic value of machining and also increases the value of the product. In this study, Taguchi method with fuzzy logic is used as an efficient approach to determine the optimal machining parameters for CNC Router 3 Axis Mach 3 lathe parts for optimizing Tool Wear on Workpiece. Experimental design using L16 43 OA orthogonal array for 2 controllable factors, namely, cutting speed and depth of cut, each at three levels to find the optimal combination of factors and levels in high-speed CNC Router 3 Axis Mach 3 turning of Aluminum Alloys 6061. From Taguchi analysis, it is known that the order of parameters that affect the tool life is the first variable Cutting Speed , second Feed, third Depth of Cut
Pemanfaatan Sistem Cold Storage Dengan Pembangkit Tenaga Surya Sebagai Pendingin Ikan Hasil Tangkapan Nelayan Pantai Sialang Buah siwan; Manurung, Charles S P Manurung; Napitupulu, Richard A M; Pardede, Erika
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 7 No. 1 (2026): Edisi Januari - April
Publisher : Lembaga Dongan Dosen

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

Abstract

Program pengabdian kepada masyarakat ini bertujuan untuk memperkenalkan dan menerapkan sistem cold storage berbasis pembangkit listrik tenaga surya (PLTS off-grid) sebagai solusi penyimpanan hasil tangkapan ikan bagi nelayan Pantai Sialang Buah, Kabupaten Serdang Bedagai. Permasalahan utama nelayan adalah keterbatasan fasilitas pendinginan dan ketergantungan terhadap listrik PLN yang tidak stabil. Sistem yang dikembangkan menggunakan dua modul panel surya 250 Wp, baterai 12 V–100 Ah, dan inverter 1 kW untuk mengoperasikan unit pendingin konvensional dengan efisiensi energi tinggi. Hasil implementasi menunjukkan bahwa cold storage mampu menjaga suhu 0–4 °C selama 12–15 jam operasi harian dengan sumber daya listrik sepenuhnya dari energi surya. Kegiatan ini juga memberikan pelatihan teknis kepada kelompok nelayan tentang penggunaan dan perawatan sistem PLTS. Hasil pengabdian menunjukkan peningkatan efisiensi energi sebesar 32% dan peningkatan pendapatan nelayan hingga 20%
Co-Authors Alberto Hutauruk Charles Manurung Charles S.P Manurung Charles S.P Manurung Charles S.P. Manurung Charles SP Manurung Chossi Sembiring Eko Yohanes Setyawan Erika Pardede Frince Marbun Jesayas Sembiring Jonner Togatorop Jusuf Halawa Lestina Siagian Libianko Sianturi Lumbangaol, Partahi Manurung, Charles S P Manurung Manurung, Charles S.P Miduk Tampubolon Muhammad Fakhri Amadika Nababan, Wilson Sabastian Naibaho, Waldemar Parulian Siagian Pasaribu, Humisar Perangin angin, siwan Perangin angin, Siwan E.A. Perangin-angin, Siwan E. Ricky Therisno Rokki Manurung Samar Tan Septiani Silitonga Septiani Silitonga Setyawan, Eko Yohanes Siagian, Horas S Siagian, Lestina Sibuk Ginting Sihaloho, Wandipu P Sihombing, Suriady Simanjuntak, J P Siwan siwan edi amanta Perangin angin Suriady Sihombing Surianto Lumbantobing Sutan Simanjuntak Tampubolon, Miduk Voice Sihombing, Hendrik Wandro Siregar Yohanes Hutahaean Yong Song Chen