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All Journal Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Polimesin
Siregar, Irpansyah
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Aerospace Engineering Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Kajian Eksperimen Kemampuan Penyerapan Energi Pada Struktur Sarang Lebah Yang Diuji Secara Statis Lubis, Sudirman; Siregar, Ahmad Marabdi; Siregar, C A; Siregar, Irpansyah
Rekayasa Material, Manufaktur dan Energi Vol 4, No 1: Maret 2021
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v4i1.6697

Abstract

The honeycomb structure is a natural or man-made structure (material) that has a honeycomb geometry, which is aimed at lightweight construction material companies, also getting a quality level from the material selection. The purpose of this study was to analyze the energy absorption ability of the statistical pressure tester. Energy absorption is a method of how an object attenuates due to external pressure. The energy absorption test was carried out by means of a statistical press test, the test object made from aluminum plates in the form of a honeycomb structure with different hexagonal size variations. This section will compare the results of the stress-strain and energy absorption data on each tested specimen to see which one is more efficient among the three specimens with different hexagonal sizes. The final result of this tester will use a graph of vertical stress - strain and energy absorption capability by horizontal and vertical testing. Therefore the results of the greatest energy absorption are in the horizontal test position with a hexagonal size of 2 mm, and the energy placement is in a vertical test position with a hexagonal size of 6 mm.
Karakteristik Unjuk Kerja 2 Pompa Sentrifugal Dengan Susunan Seri Sebagai Turbin Pat Lubis, Sudirman; Siregar, Irpansyah; Siregar, Ahmad Marabdi
Rekayasa Material, Manufaktur dan Energi Vol 3, No 2: September 2020
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v3i2.5270

Abstract

The pump is a device used to move fluid from one place to another through a media pipe or channel. The energy in the fluid is produced from the impeller which converts the kinetic energy (velocity) of the liquid into potential (dynamic) energy. Besides being used to move fluid (fluid) at this time the pump can also be used as a turbine by changing the working principle of the pump by giving a drop of water at an altitude to rotate the impeller on the pump so that the pump can operate upside down or called a pump as turbine), in this study the impeller on the pump as a turbine is driven by a water flow or water pressure that is large enough, the water flow is sourced from two centrifugal pumps with a series arrangement that functions as a driving force or fluid distributor which is assumed to be a high water fall or head. The use of centrifugal pumps with a series arrangement is so as to produce a large head to get a high water fall or a maximum head for turning a pump as a turbine. This study uses an experimental method that is using two centrifugal pumps as a fluid distributor and one pump that is used as a turbine and uses a variation of 5 watt and 10 watt light bulb. From the calculation of the suction pump and pump as a turbine without using a light bulb pump speed namely 920.5 rpm and the specific speed of the turbine produced is 76.61 rpm. by using a 5 watt light bulb load the pump rotation speed is 553 rpm and the specific turbine speed produced is 44.24 rpm, using a 10 watt light bulb load the pump rotation speed is 335 rpm and the specific turbine speed produced is 26.8 rpm. The greater the value of the pump head, the resulting water discharge will be smaller and vice versa, the size and size of the pump head obtained is also influenced by the presence of load on theturbine.
Sosialisasi Implementasi Energi terbarukan (PLTS) untuk Meningkatkan Hasil Pertanian di Kelurahan Berngam Kecamatan Binjai Kota Binjai Sumatera Utara Sihombing, Gunawan; Siregar, Irpansyah; Lubis, Kurniawan; Hasibuan, Edi Sarman; Lubis, Hariyati; Sari Nasution, Devi Maiya; Sianturi, Josten
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 2 (2025): Jurnal Pengabdian kepada Masyarakat Nusantara Edisi April - Juni
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v6i2.6144

Abstract

Pemanfaatan energi terbarukan, khususnya Pembangkit Listrik Tenaga Surya (PLTS), menjadi solusi strategis untuk meningkatkan keberlanjutan dan efisiensi di sektor pertanian. Program pengabdian masyarakat ini bertujuan untuk mensosialisasikan implementasi PLTS kepada petani di Kelurahan Berngam, Kecamatan Binjai, Kota Binjai, Sumatera Utara, sebagai upaya meningkatkan hasil pertanian sekaligus mengurangi ketergantungan pada energi fosil yang mahal dan tidak ramah lingkungan. Kegiatan pengabdian meliputi studi awal untuk memetakan kebutuhan energi petani, sosialisasi konsep dan manfaat PLTS, serta pelatihan teknis pemasangan dan perawatan sistem PLTS. Hasil kegiatan menunjukkan bahwa 75% peserta memahami konsep dasar PLTS dan menyadari manfaatnya untuk menghemat biaya energi hingga 50%. Selain itu, terjadi peningkatan produktivitas pertanian sebesar 20–25% berkat efisiensi penggunaan energi pada sistem irigasi dan penerangan lahan. Analisis biaya menunjukkan bahwa investasi awal PLTS dapat kembali dalam 2–3 tahun, dengan potensi keuntungan jangka panjang yang signifikan serta pengurangan emisi karbon. Meski demikian, masih terdapat tantangan berupa biaya awal pemasangan dan keterbatasan pemahaman teknis petani. Oleh karena itu, diperlukan dukungan tambahan berupa subsidi atau bantuan teknis agar pemanfaatan PLTS dapat diperluas, terutama bagi petani kecil, guna mendorong ketahanan energi, kesejahteraan, dan keberlanjutan lingkungan di sektor pertanian.
Impact of welding steel rod rotor bars on ripple mill efficiency and cost-effectiveness at Sumatera Jaya Agro Lestari Sawit Coconut Plant Lubis, Sudirman; Pane, Rafsanzani; Siregar, Irpansyah
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4507

Abstract

PT. Sumatera Jaya Agro Lestari is an industry that is moving in the field of Coke Processing, some long processes that include Loading Ramp, Sterilizer,Trheser, Digester, Pressing, Clarification, and Kernel Plant stations, some problems that occur in the kernel stations mainly to Efficiency results on the Ripple Mill machine, not out of the Operation and Maintenance Standards performed by Using the achievement of the target of the Cernel by the efficiency standard of 96%, on Ripple mill machines often occur cworn outes on Stell Rod due to the input of the ripple Mill Too Over Load, and the amount of nut less mature, for that was done a study on Stel Rod that has already Worn out by performing the Rewelding Method, i.e. the addition of the meat of the steel Rod to 5 mm of the surface of the Rotor-Disc to obtain the maximum Effectiveness result. The steel rod is the most important part of the mill ripple machine consisting of stone mills that move automatically so that it will not reach the maximum efficiency result at mill mills ripple rod. With the welding method, the surface of the welded meat is applied to a steel rod with a thickness of 5mm to 7mm using the MWH 500 type electrode to form the return of the base of the new steel rods surface where the strength of the electrodes and the formation of the surface are correct. The results can be inferred from the efficiency of the impact of welding steel Rod averages 93.38% achieving a very high efficiency.
Co-Authors Ahmad Marabdi Siregar Hariyati Lubis, Hariyati Hasibuan, Edi Sarman Lubis, Kurniawan Pane, Rafsanzani Sari Nasution, Devi Maiya Sianturi, Josten Sihombing, Gunawan Siregar, C A Sudirman Lubis