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All Journal Jurnal Teknik Sipil Rekayasa Mesin Media Mesin: Majalah Teknik Mesin ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Rekayasa Material, Manufaktur & Energi RELE: Rekayasa Elektrikal dan Energi Jurnal Teknik Elektro Martabe : Jurnal Pengabdian Kepada Masyarakat Vocatech : Vocational Education and Technology Journal Jurnal Ilmiah Teknik Mesin "MEKANIK" Jurnal Pendidikan Teknik Mesin Undiksha Motor Bakar : Jurnal Teknik Mesin Ihsan: Jurnal Pengabdian Masyarakat Jurnal Surya Teknika Jurnal Koridor Budapest International Research in Exact Sciences (BirEx Journal) International Journal Of Science, Technology & Management (IJSTM) Jurnal MESIL (Mesin Elektro Sipil) Poltekita: Jurnal Pengabdian Masyarakat Journal of Innovation and Community Engagement ABDI SABHA (Jurnal Pengabdian kepada Masyarakat) Proceeding International Seminar of Islamic Studies Prosiding Seminar Nasional Teknik UISU (SEMNASTEK) International Journal of Economic, Technology and Social Sciences (Injects) Jurnal Polimesin Sinonim : Journal of Language and Literature
Sudirman Lubis
Universitas Muhammadiyah Sumatera Utara
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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.
Studi Eksperimental Kekuatan Struktur Atap Berongga Berbahan Komposit Serat Alam Sudirman Lubis; Munawar A Siregar; Edi Sarman Hasibuan; Irpansyah Siregar
JURNAL SURYA TEKNIKA Vol. 9 No. 2 (2022): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v9i2.4306

Abstract

Komposit adalah suatu bahan yang terbentuk dari gabungan dua bahan atau lebih sehingga bahan komposit yang dihasilkan memiliki sifat dan karakteristik mekanik yang berbeda dengan bahan penyusunnya, serat yang digunakan dalam komposit matrik dibedakan menjadi dua yaitu serat alam dan serat sintetik. Sedangkan padi dan nanas merupakan tumbuhan yang banyak dijumpai di seluruh nusantara khususnya indonesia, sehingga hasil alam seperti beras dan nanas di indonesia sangat melimpah. Sekam padi merupakan bahan alternatif yang dapat digunakan dalam pembuatan material komposit, demikian pula serat daun nanas yang akan digunakan sebagai bahan atap merupakan cara yang baik untuk mengurangi evolusi limbah alam seperti sekam padi dan serat daun nanas. . Pada penelitian ini, penulis akan melakukan percobaan kekuatan mesin berbasis komposit menggunakan sekam padi dan serat daun nanas khususnya pada pembuatan atap hollow. Dari uji tarik yang telah dilakukan pada komposit serat sekam padi dan serat daun nanas dengan perbandingan komposisi resin 70% : 30% sekam padi dan daun nanas, 80% : 20% dan 90% : 10%. Terlihat komposisi bahan 90% : 10% mendapatkan nilai lebih tinggi yaitu 101,4 kgf/mm2, sedangkan untuk uji perbandingan perbandingan komposisi resin adalah 70% : 30% sekam padi dan serat daun nanas 80% : 20% dan 90% : 10%. Terlihat bahwa komposisi material 90% : 10% mendapatkan nilai yang lebih tinggi yaitu 1246,26 kgf/mm2.
Perlakuan Post Weld Heat Treatment (PWHT)) Baja SS400 Terhadap Kekerasan Dan Struktur Mikro: Post Weld Heat Treatment (PWHT) of SS400 Steel on Hardness and Microstructure Hazazi, M.Izza; Lubis, Sudirman
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.94547

Abstract

Write the abstract in English here. If articles in English, abstract in Indonesia language do not need to be included. Writing abbreviations and mathematical formulas in the abstract needs to be avoided. The abstract consists of summary of the research objectives, approaches or methods used, important results and conclusionsPost weld heat treatment (PWHT) has a significant influence on the mechanical properties and microstructure of low carbon steel, especially in the Base Metal, Heat-Affected Zone (HAZ), and Weld Area regions. This study aims to analyze changes in hardness and microstructure due to PWHT at 400°C, 500°C, and 600°C. The hardness test results show that at 400°C there was an increase of 24.5 HV in the Base Metal, 8.9 HV in the HAZ, and a decrease of 5.4 HV in the Weld Area. At 500°C, the increase in hardness was more significant with a value of 28.7 HV in the Base Metal, 19.8 HV in the HAZ, and a decrease of 15 HV in the Weld Area. However, at 600°C, the Base Metal decreased in hardness by 21.6 HV, the HAZ remained stable without change, and the Weld Area decreased by 17 HV. Microstructure analysis shows that PWHT at 500°C produces more significant changes than other temperatures, with greater growth of ferrite and pearlite phases. This is in line with the increase in hardness in the Base Metal and HAZ areas. In addition, observations showed that a welding current of 130A provided optimal penetration, resulting in a good metallurgical bond between the weld metal and the base metal. Thus, this study confirms that PWHT can be utilized to control the hardness and microstructure of materials to improve the quality of welded joints in low carbon steel
Pengaruh Variasi Post Weld Heat Treatment (Pwht) Terdadap Sifat Mekanik Baja Aisi 1045 Hasil Pengelasan Gmaw: The Effect of Post Weld Heat Treatment (PWHT) Variations on the Mechanical Properties of AISI 1045 Steel from GMAW Welding Results Martdiansyah, Dico; Lubis, Sudirman
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.96072

Abstract

The paper is written fully in Bahasa Indonesia (except the abstract is written in English) using Times New Roman font type, 12 font size and single row space. The paper size is A4 (21 × 29.7 cm) and the author is recommended not to write more than 10 pages. The main article content covers abstract, introduction, literature review, method, result, and conclusion. Pictures, tables and equations can be included in the article. Top, bottom, and right / left margin of the paper are 2.54 cm, respectively. The number of words in the abstract is around 200 words. The abstract should mention briefly the background, objectives, method, and main conclusions. Following the abstract, write down five keywords for indexing. An unusual abbreviation should be defined clearly after the first mentionThis study examines the effect of Post Weld Heat Treatment (PWHT) on the mechanical properties of AISI 1045 steel, particularly tensile strength and hardness, at various treatment temperatures. The tensile test results show that increasing the PWHT temperature tends to decrease the tensile strength of the material. At 600°C, the tensile strength reached 632.62 N/mm², yield strength 408.08 N/mm², and elongation 5.76%. At 700°C, the tensile strength decreased to 551.89 N/mm², the yield strength increased to 433.74 N/mm², and the elongation increased to 7.45%. Meanwhile, at 800°C, the tensile strength continued to decrease to 518.86 N/mm², the yield strength dropped significantly to 306.35 N/mm², and the elongation decreased to 4.8%. Hardness testing showed that the lowest hardness value occurred at 600°C with Base Metal (200.7 HV), Weld Area (220.4 HV), and HAZ (206.9 HV). Meanwhile, the highest hardness value was recorded at 800°C with Base Metal (214.3 HV), Weld Area (240.3 HV), and HAZ (223 HV). The highest hardness value in the Weld Area was obtained at 700°C (263.5 HV). Overall, the higher the PWHT temperature, the hardness of the material increased, but the tensile strength decreased, indicating an increasing trend in material brittleness. This study confirms that PWHT has a significant effect on the mechanical properties of AISI 1045 steel, where the increase in treatment temperature increases hardness but decreases tensile strength. Therefore, the selection of the optimal PWHT temperature needs to be considered to maintain a balance between hardness and toughness of the material in engineering applications.
Naratif Trauma dan Memori Kolektif: Pembacaan Psikoanalitik pada Novel Pasca-Konflik Lubis, Sudirman
Sinonim : Journal of Language and Literature Vol. 2 No. 02 (2024): Sinomim Journal of Language and Literature
Publisher : Cattleya Darmaya Fortuna

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54209/sinonim.v2i02.441

Abstract

Penelitian ini mengkaji naratif trauma dalam novel pasca-konflik dengan pendekatan psikoanalitik untuk mengungkap bagaimana trauma individu dan kolektif digambarkan serta dibangun dalam teks sastra. Fokus penelitian ini adalah pada bagaimana teknik naratif, seperti fragmentasi waktu, pergeseran fokalisasi, dan penggunaan arsip, digunakan oleh penulis untuk menggambarkan pengalaman traumatik yang sering kali terpecah, terputus, dan tidak dapat disampaikan dengan cara yang linear. Memori kolektif berfungsi sebagai mekanisme penting dalam proses rekonsiliasi dan pemulihan pasca-konflik, dan narasi ini berperan dalam memfasilitasi komunikasi antara trauma individu dan ingatan sosial yang lebih luas. Dengan menganalisis tiga novel pasca-konflik yang berlatar perang dan krisis sosial di Asia Tenggara, penelitian ini menemukan bahwa teknik-teknik seperti fragmentasi waktu dan fokalisasi berganda menciptakan ruang bagi pembaca untuk memahami bagaimana ingatan kolektif dibangun melalui kesaksian bersama. Penggunaan arsip (seperti foto, dokumen, dan surat) dalam teks menggambarkan bagaimana memori dapat dikonstruksi melalui materi yang dapat diakses dan diperbarui secara sosial. Sementara itu, kesunyian dalam teks—baik melalui ruang kosong dalam narasi maupun ketidakmampuan untuk menggambarkan pengalaman kekerasan secara verbal—menjadi simbol dari trauma yang tidak dapat sepenuhnya diungkapkan, namun tetap hadir dalam bentuk yang tersembunyi. Penelitian ini juga menyarankan bahwa naratif trauma pasca-konflik berfungsi bukan hanya sebagai rekonstruksi kekerasan masa lalu, tetapi juga sebagai mekanisme berduka yang memungkinkan masyarakat untuk bernegosiasi dengan ingatan kolektif yang sering kali penuh dengan ketegangan. Dengan demikian, temuan ini memberikan wawasan baru tentang bagaimana sastra pasca-konflik berperan dalam menciptakan ruang untuk rekonsiliasi memori dan membantu masyarakat untuk merawat trauma bersama yang dihadapi oleh individu dan kelompok.
Penerapan Teknologi Skimming dan Bioremediation pada Instalasi Pengelolaan Air Limbah di PT. Waruna Shipyard Indonesia Siregar, Munawar Alfansury; Damanik, Wawan Septiawan; Lubis, Sudirman; Nasutioon, Arya Rudi; Arif, Arfian
Poltekita: Jurnal Pengabdian Masyarakat Vol. 4 No. 3 (2023): Juli-September
Publisher : Pusat Penelitian & Pengabdian Masyarakat Poltekkes Kemenkes Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33860/pjpm.v4i3.1806

Abstract

Water pollution causes environmental damage and is very detrimental to living things. This activity aims to improve the performance of the Wastewater Management Installation (WWTP) which functions to reduce pollutant levels in the waters. Through the collaboration of the UMSU Faculty of Engineering with PT. Waruna Shipyrad Indonesia (WSI), collaboration was also carried out to improve the performance of the wastewater management system. Wastewater management methods are carried out by applying skimming machine technology, and several sensors for the physical properties and composition of water, as well as using remediation of good bacteria from the laboratory. 6 WWTP ponds were implemented, each with dimensions of 3.7x2.8x2.17 m. The skimming machine is designed to use a drum, and the bacteria from the remediation process will suppress the growth of bacteria that damage the environment. The volume of water entering the reservoir is around 207,200 kg/m3 perweek or 207.2 Liters/week. The results of applying this technology obtained an average amount of oil taken every 2 days reaching 600 mL. The average water quality is 6-8 with a pH standard of 6-9, a COD value of 47.8 mg/L with a quality standard of 100 mg/L, and a BOD value of 21.1 mg/L with a quality standard of 30 mg/L.
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.
PEMBERDAYAAN MASYARAKAT PASCA COVID 19 MELALUI BUDIDAYA JAMUR TIRAM Alridiwirsah, Alridiwirsah; Alqamari, Muhammad; Cemda, Abdul Rahman; Siregar, Muhammad Said; Lubis, Sudirman
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 5, No 4 (2022): Martabe : Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v5i4.1254-1259

Abstract

Jamur tiram merupakan bahan makanan bernutrisi dengan kandungan protein tinggi, kaya vitamin dan mineral, rendah karbohidrat, lemak dan kalori. Jamur ini memiliki kandungan nutrisi seperti vitamin, fosfor, besi, kalsium, karbohidrat, dan protein. Media yang umum dipakai untuk membiakkan jamut tiram adalah serbuk gergaji kayu. Permasalahan pada mitra mempunyai kendala usaha pada kapasitas produksi hanya 120 baglog/hari dan ini belum maksimal untuk memenuhi permintaan pasar baglog di sekitar Jepara. Selain itu proses pembuatannya masih sangat konvensional baik pada proses pemadatan, sterilisasi tanpa kontrol suhu uap panas, dan proses inokulasi kurang steril karena dilakukan pada ruang terbuka serta tempat penyimpanan baglog yang tidak efisien karena hanya ditaruh dilantai rumah tinggal. Solusi dan target luaran yang diberikan untuk mitra adalah penyuluhan manajemen usaha yang baik, pembuatan alat pemadatan baglog mekanis, pembuatan alat sterilisasi yang lebih besar kapasitasnya dan dilengkapi dengan kontrol suhu otomatis, dan ruangan steril untuk inokulasi. Tujuan Program pengabdian ini adalah pengabdi membantu usaha budidaya jamur tiram ditengah pandemi covid 19 di Kelurahan Denai, Kecamatan Medan Denai, Kota Medan. Kegiatan pelatihan ini dilakukan dengan pembekalan, demonstrasi cara budidaya jamur tiram putih dimulai dengan persiapan media tanam, pencampuran media, fermentasi, pengisian media dalam baglog, sterilisasi, inokulasi bibit, inkubasi, pemeliharaan dan panen serta pemberian alat produki baglog.
Co-Authors - Nurhayati ., Andri Ahmad Marabdi Siregar Alqamari, Muhammad Alridiwirsah Arfis A Arif, Arfian Arya Rudi Nasution Balisranislam, Balisranislam Benny Oktrialdi C A Siregar Candra A Siregar Cemda, Abdul Rahman Chandra A Siregar Chandra A. Siregar Chandra A. Siregar Cholish Cholish Edi Sarman Hasibuan Faisal Irsan Pasaribu Faisal Lubis Faisal Lubis Farel H Napitupulu Harahap, Partaonan Hasrudy Tanjung, Hasrudy Hazazi, M.Izza Herawati, Henny Ilmi Abdullah Indra R Harahap Irfan Nofri Irpansyah Siregar Irpansyah Siregar Khairul Umurani Martdiansyah, Dico Muhammad Arif Muhammad Firza Alpi, Muhammad Firza Muhammad Said Siregar Munawar A Siregar Munawar A Siregar Munawar A Siregar Munawar A Siregar Munawar A Siregar Munawar A. Siregar Munawar Alfansury Airegar Nasutioon, Arya Rudi Pane, Rafsanzani Partaonan Harahap Puja Rizqy Ramadhan Rafsanzani Pane Rahmatullah . Rimbawati Rini Astuti RITONGA, RAHMAT Saragi, Jandri Fan HT Siregar, C A Siregar, Chandra A Siregar, Irpansyah Siregar, Irpansyah Siregar, Munawar Alfansury Siregar, Rahmad Syukur Tulus Burhanuddin Sitorus Wawan S Damanik Wawan S Damanik Wawan S Damanik Wawan S. Damanik Wawan Septiawan Damanaik Wawan Septiawan Damanik Zulkifli Siregar Zulkifli, Zulkilfli Siregar