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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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Literasi Pemanfaatan Olahan Sampah Organik Rumah Tangga pada Kelompok Mangga RT 30 Kelurahan Sawah lebar Baru Hoten, Hendri Van; Nurbaiti; Helmizar
DHARMA RAFLESIA Vol 22 No 1 (2024): JUNI (ACCREDITED SINTA 5)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v22i1.30207

Abstract

As we all know, waste is a problem in daily life. The problem of waste that often occurs is the mixing or not being separated between organic and non-organic waste. The variety of organic waste is abundant and rich in minerals needed for soil fertility and by plants. Therefore, the management of organic waste is strived to become a culture at the smallest environmental level. There are two types of organic waste, solid and liquid. Organic waste is useful for composting planting media, while liquid waste is useful for liquid organic fertilizer (POC). Working alone often causes boredom, no sharing environment causes monotonous knowledge, lack of motivation, no mutual cooperation and mutual reinforcement. Therefore, a systems approach is needed through the formation of groups for the utilization of the organic waste. Through the 2021 FT Unib Development Service, the formation of Environmental Organic Waste Utilization Group among neighbors is an effort that is raised so that members of this group will manage household waste in at least one type, namely the manufacture of POCs and socialization of the processing of the waste.
FLOW CHARACTERISTIC OF HEAD DIFFERENCE PUMP AS ARRANGED IN SERIES AND PARALLEL Helmizar, Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9933

Abstract

Pump is a device used to move fluid. The pump moved the fluid from a lower pressure place to a place with higher pressure. If the head or pump capacity needed cannot be achieved using only one pump, it can use two pumps or even more which can be arranged either in series or in parallel. The research objective for pumps arranged in series and in parallel is to determine the characteristics of the circuit of two pumps each of which has different characteristics. In this study, data retrieval is done by measuring the pressure on suction and discharge using pressure gauge at pumps 1 and 2. Whereas to measure the flow rate of a pump arranged in series and parallel using a flowmeter installed on the discharge side of the circuit. This research was done by varied the valve openings on the pump discharge side 2 namely 2x1800, 4x1800, 6x1800, 8x1800 and full openings. From the results of tested the characteristics of the pump used water fluid on the series arrangement, the highest head value at valve opening 2 x 1800 is 30.99 m at discharge 0 LPM and the lowest head at valve opening 10 x 1800 (full) is 23.99 m at discharge 0 LPM. In parallel circuits, the highest head obtained is 16.99 m with 0 LPM discharge at 8 x 1800 valve openings and lowest head 14.99 at 0 LPM discharge occurs at full valve openings
PROSES REBENDING MENGGUNAKAN ROLL FORMING PADA PLAT SS 400/ JIS G3101 DI DALAM PEMBUATAN CORRUGATION STEEL PLATE MODEL 47J9-1C Bismantolo, Putra; Helmizar, Helmizar; Wiranto, Imam; Hoten, Hendri Van; Nurbaiti, Nurbaiti
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 1 (2020): April 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i1.13276

Abstract

Roll Forming Machine adalah produk teknis yang mengintegrasikan teknologi mekanik. Mesin ini menggunakan teknologi canggih dan sangat meningkatkan efisiensi produk. Alat ini dapat secara otomatis melokalisasi, menjepit, menyesuaikan, mengeroll, mengangkut hingga menyelesaikan pekerjaan. Mode otomatis dari jalur ini sangat menghemat biaya pembuatan, dan mesin ini menggunakan metode bending Roll Forming. Metode ini adalah proses bending yang menggunakan Up Roller dan Driven Roller yang berputar menggulirkan plat sehingga terbentuklah profil dan kelengkungan benda kerja. Dari metode Roll Forming akan didapatkan hasil dengan radius yang masih cukup besar. Standar radius pada alat ini yaitu dengan ukuran 9000mm.Jika ingin memperkecil ukuran radius maka diperlukan proses pengulangan bending (Rebending). Dengan proses Rebending maka diperlukan lagi waktu untuk pengecilan ukuran radius yang diinginkan.Cepat lambatnya proses Rebending tergantung dari bebrapa langkah yang akan dilakukan dalam menurunkan radius yang diinginkan.dengan variasi jarak penurunan up roller 3mm dan 4mm tentu akan membuat waktu pengerjaan yang berbeda. Dari variasi jarak penurunan up roll tersebut menghasilkan kurva perbandingan pengerjaan waktu total. Jarak penurunan up roller 3mm meghasilkan waktu 16,01 menit sedangkan jarak penurunan up roller 4mm lebih cepat yaitu 13,59 menit.
PENGOPERASIAN MESIN CMM UNTUK PENGUKURAN KEBULATAN BENDA KERJA BAJA S45-C Helmizar, Helmizar; Ichsan, Muhammad Ibrahim; Alqap, Sofwan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 2 (2020): Oktober 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i2.18394

Abstract

Coordinate Measuring Machine (CMM) adalah sebuah alat pengukur multi fungsi dengan kamampuan kecepatan mengukur yang tinggi dan mampu menghasilkan nilai akurasi pengukuran dan efisiensi pengukuran yang tinggi. Pada pengoperasiannya alat ini membutuhkan operator yang memiliki keterampilan khusus dalam menjalankannya.Hal ini dikarenkan dalam pengoperasian Coordinate Measuring Machine (CMM) operator harus membuat program pengukuran terlebih dahulu agar alat dalam digunakan untuk mengukur benda kerja yang diinginkan. Pada pengujiankali ini dilakukan pengoperasian Coordinate Measuring Machine (CMM) serta pembuatan program pengukuran Benda kerja Baja S45-C dengan ukuran diameter dimensi atas 159.76 mm dengan arah ukur CW, dan diameter dimensi bawah 169,76 mm dengan arah ukur CCW, yang mana pada tiap dimensi dilakukan pengukuran berulang sebanyak 5 kali pengukuran dengan tiap sekali pengukuran dilakukan sebanyak 128 titik sampel ukur. Dari hasil pengoperasian yang telah dilakukan didapatkancara mengoperasikan mesin CMM dari awal dihidupkan hinggaselesai pengoperasian. Dan dari hasil pengukuran program yang telah dibuat didapat nilai error benda kerja Baja S45-5 pada diameter atas 159,79 dengan arah probe CW untuk tiap sekali pengukuran dilakukan sebanyak 128 titik ukur sebagai sampel ukur didapatkan nilai error secara berurutan yaitu 0,1933 mm, 0,1936 mm, 0,1933 mm, 0,1940 mm, dan 0,1939 mm. Pada diameter bawah 169,76 dengan arah probe CCW untuk tiap sekali pengukuran dilakukan sebanyak 128 titik ukur sebagai sampel ukur didapatkan nilai error secara berurutan yaitu 0,1606 mm, 0,1608 mm, 0,1606 mm, 0,1612 mm, dan 0,1608 mm.
MAINTENANCE KOMPRESOR SENTRIFUGAL CENTAX CC 700 MX 3HP Nurbaiti, Nurbaiti; Hoten, Hendri Van; Helmizar, Helmizar; Bismantolo, Putra; Sulistrionio, Sulistriono
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 2 (2020): Oktober 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i2.18400

Abstract

PT. Pertamina (Persero) Refinery Unit III (RU III) is one of the Refinery Unit Pertamina that it main activity is process crude oil and intermediate product (Alkylfeed, HSDC,slop oil, LOMC, Long residue, Raw PP) into finished product. One of the important tools is Centrifugal Compressor (CENTAX CC 700 MX 3HP). The problem in the compressor is temperature of the fluida is increase but it pressure is decrease.To solve this problem, sandblasting and coating is used in inspection stage. The result from the inspection was compressor had a leak because the O ring was not functioning optimally and the surface was eroded To overcome this matter, coating is done to prevent the compressor surface from corrosion and replacing the O ring according to size.
PENGUKURAN KESALAHAN GERAK SUMBU X DAN SUMBU Z BERDASARKAN HASIL CUTTING TEST MESIN BUBUT CNC INOVASI MENGGUNAKAN COORDINATE MEASURING MACHINE (CMM) Helmizar, Helmizar; Agustian, Alvin Bayu; Alqap, A Sofwan F
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 1 (2021): April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i1.20150

Abstract

The innovation CNC lathe is one of the machine tools with two axis. The X and Y axis are very influential in producing precision products the axis on the lathe because the axis on the lathe is as a tool for driving the chisel. To determine the precision or not of the motion of the axis, it is necessary to do a cutting test (Cutting Test) then the results of the cutting test are measured for precision using a Coordinate Measuring Machine (CMM). In the cutting test, the ISO 13041-6-M4 Series is used. In this cutting test, a radius of 50 mm is used, the test object can be reused, but the programmed radius should not be more than ± 10% of the nominal radius. The circle deviation tolerance is 0.025 mm. From the measurements made, the largest error value is 1.825056 mm in the first measurement in the CW direction, while the smallest error value is 1.824025 mm in the three-way CCW measurement, the resulting deviation continues to increase along with the cutting direction. The magnitude of the deviation, and the motion between the X-axis and the Z-axis are not collaborating with each other and not constant. This is because from the starting point of the cut on the X axis to the Z axis the deviation is getting bigger. resulting in inaccurate results from the cutting test. From the cutting test and measurements made, it can be concluded that it is necessary to make improvements to the Z axis motion.
Loss of Guide Vane Disposition on Francis Turbine of Unit 6 of the Hydroelectric Power Plant PLTA Ghozali, Syaiful; Alqap, A Sofwan F; Helmizar, Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 2 (2021): Oktober 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i2.20167

Abstract

Hydropower is a power plant (PLTA) that is very environmentally friendly because it is clean and does not pollute the environment compared to other plants. PLTA, one of which is located in Bengkulu Province, is a power plant that utilizes the potential energy of water. Where the source of the water propulsion produced for the process of generating electricity is from the Tes lake which is sourced from the Air Ketahun river and the Air Pauh river, Lebong Bengkulu. Where this PLTA uses a Francis type turbine with a horizontal position. PLTA has 7 turbine units, with units 1 and 2 being old units producing 2 x 600 KW of power, while units 3 – 7 producing 5 x 4400 KW of power, so the total installed power is 23,200 KW. One of the problems that often occurs in PLTA is the occurrence of disposition of the guide vane on the turbine, where this time we will find out the cause of the disposition and how to overcome it so that there is no disposition and find out the loss of disposition of the guide vane on the Francis unit 6 turbine at PLTA. With this research done, the disposition occurs, it is necessary to take corrective action so that the unit will stop operating and can affect the level of profitability of the company. So that the results of the unit's work if it operates 24 hours are approximately 82 million rupiah, repairs are carried out for 16 hours with a loss of approximately 55 million rupiah. The occurrence of disposition is caused by damage to the transrack so that large waste enters the turbine section. In order to prevent disposition, it is necessary to repair or replace the transrack at the inlet.
ANALISA RESPON GETARAN PADA TURBIN FRANCIS DENGAN MENGGUNAKAN SINYAL SUARA M.Hapis Apmarwansahrowi; Dedi Suryadi; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25450

Abstract

Damage is very common in the PLTA Hydroelectric francis turbine, usually appearing on parts, clutches, gears, bearings, or other drive components. Proper fault diagnosis can help to reduce or even prevent breakdowns. To identify damage to the turbine can use sound signal analysis. This method analyzes using sound signals. By analogizing vibrations as sound waves produced by mechanical vibrations, it is hoped that the sound signal can be used as a parameter to determine the condition of the turbine. In this study, to get the best signal, a microphone is used as a sensor to capture sound signals which are placed on the guide bearing of the hydropower test turbine. The sound signal in the time domain is then transferred to a signal in the frequency domain using Fast Fourier Transform (FFT). The results of the test showed that there were 2 active frequencies, 1x rpm and 2x rpm at a turbine rotation of 500 rpm for 6 days of testing. These characteristics indicate the identification of the problem of the bent shaft on the turbine.
PENGARUH PEMBEBANAN TERHADAP ARUS EKSITASI PADA GENERATOR Hamdan Rizal Maulana; Agus Suandi; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25458

Abstract

The generator in the hydropower system is used to convert mechanical energy originating from the turbine rotation into electrical energy by producing an electromotive force. Excitation is one of the most crucial parts of the Generator system, where excitation plays a role in forming/producing electromagnetic flux, resulting in an induced emf. The amplifying current is used to adjust the magnitude of the output voltage according to the applied load. The tool used to regulate the excitation current is the Automatic Voltage Regulator (AVR). The differential loading on the generator changes every time. Therefore a power plant must be able to generate electricity in accordance with the magnitude of the changing load. In power generation, these loading fluctuations can be overcome by adjusting the water valve opening and the excitation current flowing to the electromagnet coil on the generator rotor with constant rotor rotation by the AVR so that electric power is generated according to the applied load. The purpose of this study is to analyze the effect of the load on the excitation current. The results obtained are the load has an effect on the excitation current.
PERAWATAN MESIN CUTTING RETURN BENDS Gunawan, Hendi; Puspawan, Angky; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 1 (2023): April 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v7i1.30101

Abstract

The cutting return bend machine itself adopts a programmable logic controller for the interface control center between man and machine for its operation. With the characteristics of high-level optimization, speed, comfortable operation, high precision, reliable performance and attractive appearance. For the use of the cutting return bend machine itself, which is used for the production of u-shaped tubes which will later be used for the manufacture of evaporators and condensors. Maintenance also includes all necessary actions to be able to maintain and maintain product quality so that there is no damage or disruption to the machine so that producing products can achieve the targets as desired by the company. From the observations made, it is found that the problems that occur in the cutting return bend machine at PT. Panasonic Manufacturing Indonesia are damage to the mandrell, stripper,and problem with the bending mechanism. The solution of these problems are need to maintenance of the machine, which is corrective maintenance, preventive maintenance, predictive maintenance, and even emergency maintenance.
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 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