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All Journal Jurnal Energi Dan Manufaktur Jurnal Teknik Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN INTEKNA Jurnal Bisnis, Manajemen, dan Informatika Turbo : Jurnal Program Studi Teknik Mesin Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Jurnal Teknik Mesin Electrician : Jurnal Rekayasa dan Teknologi Elektro Finger : Jurnal Ilmiah Teknologi Pendidikan TEKNOSIA Jurnal Polimesin Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Dharmakayana: Journal of scientists, engineers, educators and scientific activists related to society development
Helmizar -
Teknik Mesin-Universitas Bengkulu, Bengkulu, 38371, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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PROSES MANUFAKTUR UNTUK PEMBUATAN PART SPOILER PESAWAT Hibatullah, Fauzi; A. Sofwan F Alqap; Helmizar
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.v7i2.34060

Abstract

Manufacture is an activity or process to change the form of material from raw into semi or finished goods. The process begins with designing the product, determining the specifications of the material from which the product is made. A series of manufacturing processes may include cutting, forming, thermal treating, inspection, and finishing. Inspection duties are of the Quality Control section tasks. These duties include visual inspection and measurement that takes place before, during and after the production process. CNC machines that are operated for the cutting processes still use memory in the form of punched paper as a medium for transferring G and M codes to the control system. There are two programming methods in CNC machines, namely incremental method and absolute one. The first is where the reference point is always changing, i.e. the last point is to be used as a new reference for the next. The second is where the reference point is fixed, i.e. the first position is used as a reference for all steps. Spoilers are panels mounted on the upper surface of the wing that, when extended, both increase drag and decrease lift by disrupting the airflow over the wing. Manufacturing steps of the spoiler actuator are material verification, turning processes, removing burs, precipitation hardening, hardness checking, turning for surface finishing, grinding, honing, hole surface finishing, flaw inspection, and packing
MAINTENANCE PADA POMPA SENTRIFUGAL KEWPUMP Ginting, Zefanya Karsten; Helmizar; Puspawan, Angky
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2024): April 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v8i1.36550

Abstract

Kewpump centrifugal pump is a very important pump in PT. Incasi Raya Edible Oil, West Sumatra Province. Where the efficiency of this pomp greatly affects the performance of PT. Incasi Raya. The use of this centrifuga pump is to move CPO (Crude Palm Oil). This practical work report conveys information on kewpump centrifugal pump maintenance management. This pump works for 24 hours without stopping. Things that need to be done before maintenance are checking into the field, looking for the source of damage, recording the recurrence of the damage, taking data, asking for maintenance schedules. Usually damage to the pump in PT. Incasi Raya occurs due to mechanical seals, damaged bearings, impeller jams that will affect pump performance, so maintenance is carried out using the corrective maintenance method. Based on the maintenance activities carried out, the results were obtained that damage to the pump occurred in the mechanical seal, with moderate damage that was inspected periodically. Then it is necessary to carry out maintenance in accordance with the procedures that have been made.
PREVENTIVE MAINTENANCE PADA COAL PREVENTIVE MAINTENANCE PADA COAL MILL (PULVERIZER) ISMAEL , ALIF RAHMAN PELDIANSYAH; Witanto, Yovan; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2025): April 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i1.40176

Abstract

Coal mill (pulverizer) is used to grind coal into micro-sized particles suitable for combustion. This study aims to analyze the preventive maintenance applied to the coal pulverizer to prevent damage and improve operational efficiency. Preventive maintenance procedures include routine tasks such as visual inspection, lubrication, cleaning, and component tightening. During the process, problems such as hydraulic pipe leakage and other component malfunctions are identified and immediately addressed to prevent further impacts. Preventive maintenance has proven effective in minimizing the risk of unplanned downtime, supporting sustainable production, and improving the efficiency of the coal pulverizer. The operational principle of the pulverizer involves grinding coal between the grinding roller and the grinding table, assisted by airflow from the primary air fan to produce coal powder with a size of 200 mesh, ready for combustion in the burner. In conclusion, preventive maintenance is very important to maintain equipment performance, reduce potential damage, and ensure smooth production processes.
AnalisisEffect of Ethanol–LPG Dual Fuel on Output Voltage Stability of a Four-Stroke Generator Witanto, Yovan; Nuramal, Agus; Pratama, Samuel Yoga; Helmizar, Helmizar; Rosa, Khairul Amri
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 1 (2025): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i1.3767

Abstract

 This study aims to analyze the effect of load variation on the output voltage of a modified four-stroke generator using a dual-fuel system consisting of ethanol and liquefied petroleum gas (LPG). Ethanol 96% was used as the primary fuel, while LPG was injected through an ideal mixture screw with the aid of a converter kit, pressure regulator, and flowmeter to control gas flow. The test subject was a modified Yasuka 1500DC gasoline generator. Experiments were conducted using incandescent lamp loads ranging from 200 to 1000 watts, in 200-watt intervals, each applied for 2 minutes at a constant engine speed. The observed parameters included fuel consumption and output voltage. The LPG flow rates tested were 0.2, 0.4, 0.6, and 0.8 liters per minute. The results showed that the ethanol–LPG combination at a flow rate of 0.8 l/min produced the highest and most stable voltage output, remaining above the safe threshold of 198 volts. Compared to pure ethanol or gasoline, the dual-fuel system was more effective in maintaining voltage under high load conditions. This is attributed to LPG’s high calorific value and its ease of mixing with air, which enhances combustion quality. 
Design of an Off-Grid Solar PV System for a Renewable Energy-Based Home in Bengkulu Rinaldi, Reza Satria; Herawati, Afriyastuti; Anggraini, Ika Novia; Helmizar, Helmizar
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 7 No 3 (2025): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/motivection.v7i3.449

Abstract

Bengkulu Province has a solar energy potential of 3,475 MW, with an average daily solar irradiance duration of 5.9 hours in 2022 and 8.3 hours in 2023. This study designs an off-grid solar PV system for a renewable energy-based home (REH) model in the coastal area of Bengkulu City. The REH is a home with electrical energy independence that utilizes renewable energy systems to generate electricity. This study focuses on the REH powered by solar energy, intended for a modest home with a power capacity equivalent to a 900 VA PLN customer classification. The data on solar energy potential in the coastal area of ​​Bengkulu City used in this study is from the Global Solar Atlas. The data analysis confirmed the need for the REH model to generate electricity from solar energy, requiring 12 units of 120Wp PV modules in a PV array. An appropriate solar charge controller for this REH model is the MPPT SCC with a rating of 48 V 30 A. Based on the selected PV modules and the daily load of the REH model, the required 48 V battery capacity is 300 Ah, and the PSW Inverter 2,000 VA 48 V.
Experimental study on a laboratory-scale archimedes screw turbine using pitch-to-diameter ratio for low-head hydropower Helmizar Helmizar; Nurcholish Windiharto; Yovan Witanto; Afdhal Kurniawan Mainil; Rahmat Iman Mainil; Khotso Sai
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6690

Abstract

The Archimedes screw is a hydropower technology well-suited for low-head applications This study investigates the performance of a laboratory-scale Archimedes screw turbine for low-head hydropower applications by varying pitch-to-diameter ratio (P/D = 0.3, 0.38, 0.45, 0.52) and inclination angle (β = 22°, 25°, 27°). Experiments were conducted in a controlled water flow environment to evaluate torque, power output, and efficiency at different rotational speeds. Results indicate that both P/D and β significantly influence energy conversion. The highest performance was achieved at P/D = 0.45 and β = 22°, producing a peak torque of 0.36 Nm, a power output of 2.4 W, and a maximum efficiency of 52.37%. Lower inclination angles contributed to improved hydraulic energy capture due to better water filling and reduced slippage. These findings highlight the importance of optimizing geometric parameters to enhance turbine performance in small-scale, sustainable energy systems. The results offer design guidance for implementing Archimedes screw turbines in rural or off-grid low-head hydropower scenarios.
Needs Analysis for the Development of Intelligent Wheelchair Assistant Technology to be Integrated into Hybrid Classes for Students with Disabilities Risdianto, Eko; Helmizar, Helmizar; Kurniawan, Adhadi; Nazry, Nor Nazrina Mohamad
FINGER : Jurnal Ilmiah Teknologi Pendidikan Vol. 3 No. 3 (2024): Finger : Jurnal Ilmiah Teknologi Pendidikan
Publisher : CV. Media Inti Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58723/finger.v3i3.328

Abstract

This study aims to analyze students' needs for the development of intelligent wheelchair assistant technology to be integrated into hybrid classes for students with disabilities. This research is motivated by the importance of creating a foundation for developing more inclusive and effective technology in the world of education. The use of intelligent wheelchair assistant technology is expected to improve the learning experience of students with disabilities and enable more equitable and inclusive education. The research is part of quantitative research conducted in March 2024. The population in this study consisted of 124 students from several universities. The instrument used in this study was a needs analysis questionnaire sheet consisting of 19 statements with answer choices following the Likert scale guidelines. The results of the needs questionnaire analysis showed that students needed the development of intelligent wheelchair assistant technology to be integrated into hybrid classes for students with disabilities as evidenced by the results of the needs analysis questionnaire of 81.39% in the strongly agree category.
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.  
Socialization of New and Renewable Energy for Community of Sawah Lebar Baru Sub-District, Ratu Agung District, Bengkulu City: Sosialisasi Sumber Energi Baru dan Terbarukan untuk Masyarakat Kelurahan Sawah Lebar Baru, Kecamatan Ratu Agung, Kota Bengkulu Angky Puspawan; Afdhal Kuniawan Mainil; Helmizar; Fepy Supriani; Hardiansyah; Hendri Hestiawan; Khairul Amri; Makmun Reza Razali; Nurul Iman Supardi
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.v2i1.41616

Abstract

Pertumbuhan ekonomi dan kemajuan teknologi akan menyebabkan tingginya penggunaan energi. Sebagian besar energi di dunia menggunakan sumber energi berbasis fosil, dimana penggunaannya menghasilkan emisi gas rumah kaca yang berdampak buruk pada lingkungan, seperti pemanasan global dan dampak negatif terhadap kesehatan manusia. Karenanya beberapa negara maju dan berkembang melakukan aksi dalam pembatasan penggunaan energi fosil dan mendorong pemanfaatan energi baru dan terbarukan yang lebih ramah lingkungan dan lebih berkelnajutan (sustainable). Diantara aksi tersebut adalah Paris Agreement pada tahun 2015 yang mendorong setiap negara melakukan kegiatan untuk menurunkan iklim global setidaknya 1,5°C – 2°C. Energi baru dan terbarukan adalah sumber daya energi alami yang dapat digunakan secara bebas, terus diperbaharui, tak terbatas, dan terus berkelanjutan. Hal-hal terpenting adalah terkait jenis, sumber, dan manfaat dari energi baru dan terbarukan. Kebutuhan manusia akan sumber daya energi tidak dapat diabaikan, karena setiap aktivitas memerlukan sumber daya, baik itu terbarukan maupun tidak. Namun, penggunaan sumber daya energi yang tidak dapat diperbaharui berlebihan telah menyebabkan kerusakan lingkungan alam yang serius dan akhirnya menghasilkan polusi yang berbahaya bagi Kesehatan manusia dan lingkungan. Dalam menghadapi keterbatasan sumber daya energi yang tak terbarukan, para ilmuwan dari berbagai negara telah mulai mengembangkan sumber daya energi baru dan terbarukan. Kegiatan pengabdian ini tidak hanya bertujuan untuk memperkenalkan konsep energi baru dan terbarukan, tetapi juga memberikan solusi konkret terhadap masalah sampah yang telah menjadi ancaman serius bagi lingkungan dan kesehatan masyarakat. Masalah sampah, khususnya limbah anorganik, telah menjadi salah satu isu utama yang dihadapi masyarakat modern. Setiap hari, tumpukan sampah kian menggunung, menciptakan dampak negatif yang signifikan, terutama ketika musim hujan tiba. Krisis ini tidak hanya berdampak pada keindahan lingkungan, tetapi juga berpotensi menyebabkan banjir yang melanda daerah pemukiman. Sampah anorganik, seperti plastik, tidak dapat terurai secara alami, sehingga memerlukan intervensi yang inovatif dan berkelanjutan. Sebagai respons terhadap tantangan tersebut, tim pengabdi mengembangkan teknologi mesin pencacah sampah anorganik yang revolusioner. Teknologi ini mampu mengubah limbah plastik menjadi serbuk atau biji plastik, sehingga memfasilitasi proses daur ulang yang lebih efisien. Dengan inovasi ini, kita tidak hanya mengurangi volume sampah, tetapi juga memberikan nilai tambah pada limbah yang selama ini dianggap sebagai masalah. Proses distilasi merupakan salah satu cara atau solusi untuk menghasilkan minyak hasil proses distilasi dengan metode pirolisis untuk bahan bakar cair dan ini menjadi salah satu sumber energi alternatif. Energi alternatif ini diperoleh dari sampah berbagai macam atau tipenya. Karena bahan bakunya berlimpah maka selain menjadi bahan bakar alternatif juga mampu menyelesaikan masalah sampah anorganik yang nyata tidak dapat diperbaharui dan dapat merusak tanah dan lingkungan.
PREVENTIVE MAINTENANCE CLOSED COOLING WATER PUMP TURBINE PADA PLTU PRIAMANAYA ENERGI KEBAN AGUNG LAHAT 2 X 135 MW Satria, Miko; Nuramal, Agus; Mainil, Afdhal Kurniawan; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 2 (2025): Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i2.39688

Abstract

Preventive maintenance is a maintenance and care activity carried out to prevent unexpected damage and to find conditions or circumstances that can cause production facilities to experience damage during the production process. The purpose of the research conducted by the author is to determine the implementation of preventive maintenance on the closed cooling water pump turbine at the Priamanaya Energi Keban Agung Lahat 2 x 135 MW PLTU, this research was conducted using the observation method or going directly to the field. This research resulted in that by carrying out preventive maintenance regularly and effectively on the closed cooling water pump at this PLTU, the company can ensure that they not only maintain smooth and efficient operations, but also reduce the risk of damage that can disrupt production.
Co-Authors Adhadi Kurniawan Afdhal Kuniawan Mainil Afdhal Kurniawan Maini Afdhal Kurniawan Mainil Agus Nuramal Agus Suandi Agustian, Alvin Bayu Alqap, A. Sofwan F Andang Wijanarko Anggraini, Ika Novia Angky Puspawan Bismantolo, Putra Chossy Aulia Prasetyo Dedi Suryadi Eko Risdianto Fauzan Andreas FEPY SUPRIANI Firmansyah Adam Permana Agustian Ghozali, Syaiful Ginting, Zefanya Karsten Hamdan Rizal Maulana Hardiansyah Hendi Gunawan Hendri Hestiawan Hendri van Hoten Herawati, Afriyastuti Hery Suhartoyo Hibatullah, Fauzi Ichsan, Muhammad Ibrahim ISMAEL , ALIF RAHMAN PELDIANSYAH Khairul Amri Khotso Sai M.Hapis Apmarwansahrowi Makmun Reza Razali Mochammad Yusa Muhammad Khairul Amri Rosa Nazry, Nor Nazrina Mohamad Nurbaiti Nurbaiti Nurbaiti Nurcholish Windiharto Nurul Hidayati Nurul Iman Supardi Pratama, Samuel Yoga Rahmat Iman Mainil Reza Satria Rinaldi Rijalul Rahman Hakim Rosa, Khairul Amri Satria, Miko Setiawan, Yudi Sulistrionio, Sulistriono Wiranto, Imam Yovan Witanto Yovan Witanto Yudi Setiawan