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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

Author-ID : 5305802

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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Pengeringan Kopi Arabica Sistim Terintegrasi Penyimpanan Termal Dengan dan Tanpa Desikkan Parulian Siagian; Richard A M Napitupulu; Siwan P Peranginangin
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 1 (2022): Edisi Agustus 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Penelitian ini mengkaji dan meniliai keefektifan pengering surya yg kontiniu dan terintegrasi dengan pengeringan penyimpanan panas dikombinasikan dengan molekuler13 (Na86 [(AlO2)86 (SiO2)106] 264H2O) sebagai penahan kelembapan. Hasil menunjukkan pada kondisi terik matahari, temperature didalam ruang pengering cenderung berbeda antara 42.100C-46.600C dan rata rata 6.700C -11.180C diatas tempratur ambient, rata rata kelembapan 68.94% dengan rata rata kecepatan udara 1.16m/s. Pengeringan konvensional membutuhkan waktu selama 5 hari dengan temperatur maksimum 35.420C pada rata rata kecepatan angin 0.7m/s. Waktu pengeringan dengan menggunakan desikkan dan tanpa menggunakan desikkan adalah 35 jam dimana bobot 8.207.kg pakai desikkan dan bobot 8.370.kg tanpa desikkan dengan kadar air 13%, sementara pengeringan konvensional membutuhkan waktu 120 jam atau 5 hari dengan suhu maksimum 35.420C dan suhu rata rata 29.700C. Mutu aroma kopi oleh tim teaster bahwa yang memakai desikkan cenderung aroma aromatic better dan coklat, caramel serta rasa pahit yang kuat, sementara tanpa desikkan ada rasa pahit agak lemah dan rasa defect

Proses Pack Carburizing Baja Karbon Dengan Arang Kayu dan Arang Tulang Sapi Richard A. M. Napitupulu; Surianto Lumbantobing; Charles SP Manurung
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 9 No 1 (2023)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2023.v09.i01.p02

Karburisasi adalah salah satu proses yang paling banyak dilakukan pada perlakuan pengerasan di daerah permukaan baja. Proses ini selain meningkatkan kadar karbon juga sebagai langkah awal dari proses pengerasan pada permukaan sehingga material baja memiliki kombinasi sifat keras di bagian luar dan tetap ulet di bagian dalam. Penelitian ini dilakukan untuk meningkatkan kadar karbon pada baja dengan sumber karbon yang berasal dari arang kayu dan arang tulang sapi. Pada kondisi awal, spesimen memiliki kekerasan pada bagian diameter terluar 187,909 HV, komposisi karbon sebesar 0,18%C. Spesimen dipanaskan hingga temperatur 9000C dengan variasi waktu penahanan 30, 45 dan 60 menit dan masing-masing variabel diberi sumber karbon dari arang kayu dan arang tulang sapi yang diharapkan dapat berdifusi di permukaan baja. Kekerasan yang paling meningkat adalah pada spesimen dengan waktu penahanan 45 menit dan sumber karbon dari arang kayu dengan angka kekerasan 734,38 HV dan kadar karbon 0,201 % C. Secara umum terjadi peningkatan kekerasan dan kadar karbon akibat adanya difusi atom C yang berasal dari arang, namun juga terdapat adanya penurunan kadar karbon di permukaan yang dapat disebabkan oleh karena waktu penahanan yang berlebih atas dimensi spesimen. Carburizing is one of the most widely used processes in hardening treatments in the steel surface area. This process in addition to increasing the carbon content is also the first step of the surface hardening process so that the steel material has a combination of hard properties on the outside and remains ductile on the inside. This research was conducted to increase the carbon content of steel with carbon sources derived from wood charcoal and beef bone charcoal. In the initial conditions, the specimen has a hardness at the outer diameter of 187.909 HV, the carbon composition is 0.18%C. The specimens were heated to a temperature of 9000C with variations in holding times of 30, 45 and 60 minutes and each variable was given a carbon source from wood charcoal and beef bone charcoal which were expected to diffuse on the steel surface. The most increased hardness was in specimens with a holding time of 45 minutes and carbon source from wood charcoal with a hardness number of 734.38 HV and a carbon content of 0.201 % C. In general, an increase in hardness and carbon content was due to the diffusion of C atoms from charcoal, but there is also a decrease in the carbon content on the surface which can be caused by excessive holding time on the dimensions of the specimen.

Optimization of Nickel Electroplating on Low Carbon Steel for Corrosion Resistance using Immersion Corrosiontest with 3.5% NaCl Parulian Siagian; Richard A.M. Napitupulu; Eko Yohanes Setyawan; Muhammad Fakhri Amadika
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3270

This research studied the corrosion resistance of low carbon steel that has been coated with nickel in NaCl solution by the Immersion Corrosion method with 3.5% NaCl liquid. Coating is done to increase the wear resistance of low carbon steel. The coating is done by electroplating process, with various voltages of 3V, 3.5V, 4V and 5V and the liquid is heated to a temperature of 44-60oC in the immersion time range of 30 minutes, 40 minutes and 50 minutes for each voltage variation. From the results of the study, it was found that the longer the immersion time in the electroplating process, the thicker the resulting layer with the addition of about 4 - 8µm for each difference in immersion time.

Cara pemakaian mesin cara dan perawatan Mesin Pengupas Gabah Padi kepada Masyarakat Desa Amborgan Kecamatan Porsea Kabupaten Tobasa Richard A.M Napitupulu; Perangin angin, siwan
Jurnal Visi Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2024): Jurnal Visi Pengabdian Kepada Masyarakat : Edisi Agustus 2024
Publisher : LPPM Universitas HKBP Nommensen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51622/pengabdian.v5i2.2447

Abstract Rice is an agricultural product that is the main consumption of the Indonesian people, especially the people of the province of North Sumatra and especially in the TOBASA area and the Amborgan Village Community, Porsea District. In an area there is usually only one unit of rice hulling machine. For the rice hulling process, most farmers do the milling at that place and often have to queue because of the many farmers who will hull the rice. Therefore, with the help of a rice hulling machine, it can make it easier for the community, especially the home industry, to speed up the rice hulling process. Therefore, the Mechanical Engineering Study Program, HKBP Nommensen University, carried out community service to the village of Amborgan Village, Porsea District, TOBASA Regency by donating and providing training on operating a rice hulling machine. The result is that the community and the district government, especially the TOBASA Regency DPRD, are very happy with this program. And the community there is helped by the tools donated by the UHN Mechanical Engineering Study Program because they can helpis the essence of all parts of a complete paper that contains 75-200 with 10pt font size and protrudes 1cm from the left margin and right margin. The abstract is written in less than half a page. Abstract written in English and Indonesian.

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

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.

PENGARUH HOT DIP GALVANIZING BAJA KARBON RENDAH TERHADAP KETEBALAN STRUKTUR MIKRO DAN KEKERASAN Napitupulu, Richard A M; Perangin angin, Siwan E A; Sihaloho, Wandipu P
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2025): Edisi Agustus
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v6i2.2478

Baja ST41 merupakan baja karbon rendah yang banyak digunakan sebagai material komponen mesin, namun memiliki kelemahan berupa nilai kekerasan yang rendah. Salah satu metode untuk meningkatkan kekerasan baja karbon rendah adalah dengan proses Hot Dip Galvanizing. Penelitian ini bertujuan untuk mengetahui pengaruh variasi waktu pencelupan terhadap nilai kekerasan dan komposisi kimia pada baja ST41. Proses galvanisasi dilakukan pada temperatur 440°C, 450°C, dan 460°C dengan variasi waktu pencelupan selama 30, 45, dan 60 detik. Pengujian meliputi uji kekerasan menggunakan mikrometer Vickers, uji ketebalan lapisan, struktur mikro, dan uji komposisi kimia. Hasil penelitian menunjukkan bahwa proses hot dip galvanizing dapat meningkatkan kekerasan baja ST41, dengan nilai tertinggi sebesar 223,80 VHN pada suhu 460°C dan waktu pencelupan 60 detik. Ketebalan lapisan seng yang terbentuk masing-masing adalah 12,10 µm, 13,93 µm, dan 13,69 µm. Pengamatan struktur mikro menunjukkan pembentukan lapisan yang merata, yang terdiri dari fasa eta, zeta, delta, dan gamma sebagai hasil dari proses difusi antara seng dan baja.

Pengaruh Material Reflektor Terhadap Kinerja Kompor Energi Surya Napitupulu, Richard A M; Manurung, Charles S.P; Naibaho, Waldemar; Sihombing, Suriady
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 3 No 2 (2022): Edisi Februari 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

The use of solar energy in Indonesia is the right choice as an alternative energy for energy needs in industry or to meet daily energy needs in households. To utilize solar energy for cooking purposes, a solar cooker can be used. Factors that affect the performance of this solar cooker in addition to the length of time it shines and the intensity of thermal radiation from the sun are the reflexivity of the collector material, the surface area of the collector, the geometric shape and location of the focal point of the collector, the normal direction of the collector surface to the incoming sunlight, and the amount of heat loss to the surroundings. The materials used as reflectors in the research on this solar cooker are zinc (aluminum and galvanized) AL-Zn and black paint back ground mirror glass. This material is re-glued on top of a ready-made parabolic dish from the market. Then look for the focal point that corresponds to the diameter of the parabola. From the results of the study, it can be concluded that the back ground mirror glass material with black paint is better to use than the AL-Zn zinc plate if it is used as a raw material for the surface material (reflector) of solar cooker. Likewise, the efficiency of the solar oven in terms of the amount of heat that is converted into energy for heating the pot is better for a solar oven than a reflector with black paint back ground mirror glass material. And the efficiency of the solar cooker from the black paint back ground mirror on the first day is 16.4% to 25.7% on the second day, while the efficiency of the solar cooker from the AL-Zn zinc plate on the first day is 16.4% to second day 22.8%. The emissivity of the solar stove with AL-Zn zinc plate reflector on the first day was 0.02906 and on the second day 0.02892, while the emissivity of the solar cooker with black paint back ground mirror reflector on the first day was 0.01812 and the second day was 0 0.02544.

Rancangan Fasilitas Pembangkit Listrik Tenaga Sampah: Studi Kasus di Kota Medan Sumatera Utara Simanjuntak, J P; Napitupulu, Richard A M; Lumbangaol, Partahi
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 3 No 2 (2022): Edisi Februari 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

In planning a power generation system using waste as an energy source, it is necessary to conduct an initial analysis of the potential local waste available. Not all waste can be used as the source of thermal energy by burning in an incinerator. Therefore, the selection is required to obtain the suitable waste and characterization to determine the potential thermal energy content in the waste. This article aims to obtain the electrical capacity produced from local waste to generate electricity in some regions of the city of Medan. The analysis is carried out on the availability of the waste and its potential for thermal energy generated. The selected incinerator of the fixed bed type with a two-stage air supply was explained comprehensively. Minimum pollution, high thermal conversion, and ease of operation are the critical point considered for the selected incinerator. The results revealed that 50 kWe was generated from a power plant system using waste. This amount of electricity can provide electricity for 25 households in the area where the case is located. This study is expected to provide sustainable waste management to the city of Medan in converting the waste into the household electricity supply.

Analisa Kebutuhan Energi Termal Pada Kotak Pengering Biji Kopi Arabica yang di Isolasi dengan Aluminium Foil Siagian, Parulian; Napitupulu, Richard A. M.; Tampubolon, Miduk; Siagian, Lestina
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.946

The experiment test was carried out to obtain the composition of the caloric quality needed to determine the water content and the mass amount of coffee beans when they were dried by utilizing the sun's heat. Heat transfer processes by convection, conduction and radiation play an important role in the drying process with heat quality. Ambient temperature data of 350C with a constant fan rotation speed of 1.0m/s. The duration of the test is 5 days where the initial sample weight is 5000gr with the final result being a water content of 12-15%, with a duration of testing per day for 10 hours starting at 08.00-18.00Wib. The final drying weight of coffee beans for 5 days is: 2500.21gr with an initial weight of 5000kg. The temperature difference around the box is 31,110C. heat weight to evaporate water content Qh= 65.6058.kJ. and the heat required in heating the Coffee beans is 72,839 kJ. The ability to dry 5000gr of coffee beans requires total heat: 138.43kJ with a drying box volume of 8.88m3.

ANALISIS TEKNO EKONOMI ATAP SURYA STUDI KASUS DI KOTA MEDAN, INDONESIA Nababan, Wilson Sabastian; Sihombing, Suriady; Peranginangin, Siwan Ediamanta; Napitupulu, Richard A.M
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.v5i1.1197

Indonesia has released its pledge on reducing Greenhouse Gas (GHG) emissions. Mitigation measures include increasing the use of renewable energy. Solar roofs are one potential mitigation measure to meet GHG emission reduction and renewable energy targets. As more attention is being focused on developing this renewable energy resource globally, the technical and economic assessment of this resource is critical to ascertain its feasibility. In this study, a technological and economic analysis of solar roof tops is presented. The analysis was carried out based on solar irradiation in the city of Medan, Indonesia. Solar irradiation over several days was measured. The measured data and the solar photovoltaic module panels available in the Indonesian market are used to carry out the technical analysis. Based on the technical analysis and economic analysis carried out, the economic analysis of the results of the visualization of the power produced by the PV system which was carried out for 1 year resulted in a total value of electricity of IDR 3,672,895 for the city of Medan. It is expected to provide the necessary information to build cities with low emissions. Keywords: Solar Roof, Photovoltaics, Technoeconomics

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 Manihuruk 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 Yogie Probo Sibagariang Yohanes Hutahaean Yong Song Chen

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