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Alfeus Sunarso
Politeknik Negeri Pontianak
Mechanical Engineering

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Pengaruh Kedalaman Pencelupan Sudu Kincir Terhadap Unjuk Kerja Kincir Air Ignatius Gunawan Widodo; Alfeus Sunarso; Agato Agato; Halasan Sihombing; Dominikus Sulistiono
Jurnal Rekayasa Mesin Vol 13, No 2 (2018): Volume 13, Nomor 2, Agustus 2018
Publisher : Jurusan Teknik Mesin - Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.729 KB) | DOI: 10.32497/rm.v13i2.1246

Abstract

Penelitian ini bertujuan untuk mendukung pengembangan Pembangkit Listrik Tenaga arus sungai, untuk mendapatkan kedalaman sudu kincir yang paling optimal pada berbagai kecepatan arus sungai. Penelitian ini dilakukan pada skala laboratorium dengan menggunakan peralatan  uji unjuk kerja kincir air di Laboratorium Teknik Mesin Politeknik Negeri Pontianak. Peralatan uji unjuk kerja kincir air ini  menggunakan saluran eksperimen yang dialiri air dari bak penenang atas, yang diisikan dengan menggunakan dua buah pompa, dimana air dihisap dari bak penampung bawah. Kecepatan air yang melalui saluran eksperimen dapat diatur dengan merubah volume air yang dialirkan, dengan cara menaikan kecepatan pompa air. Penelitian dilakukan dengan mengambil data dari beberapa kecepatan air dalam saluran eksperimen antara lain kecepatan terendah 1,4 m/dt sampai dengan 2,0 m/dt. Data penelitian diperoleh dengan melakukan pengereman sebagai beban pada puli yang berputar dengan pembebanan bervariasi dari 0.2 kg s/d beban maksimal saat kincir  berhenti. Hasil pengujian  diperoleh  data kecepatan putaran (rpm), beban (kg). Hasil perhitungan dan analisa diolah dalam bentuk grafik antara beban, daya dan efisiensi.Hasilnya menunjukan bahwa semakin dalam pencelupan sudu kincir  akan diperoleh daya yang makin besar, sedangkan efisiensinya akan naik juga namun  pada kedalaman  tertentu  efisiensinya  akan mengalami penurunan kembali.
PENGARUH TINGGI CELAH ALIRAN PADA SLUICE GATE TERHADAP KINERJA KINCIR AIR JENIS SUDU MELENGKUNG Ridho Dwi Syahrial; Rudy Soenoko; Teguh Dwi Widodo; Alfeus Sunarso
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1095

Abstract

This study aimed to determine the effect of adding the sluice gate and the optimal width of the sluice gate on the waterwheel performance. Tests have been carried out experimentally on a laboratory scale. In the test, this study used an open channel waterwheel with variations in the flow gap width gate width of 25mm, 35mm, and 40mm. Each variation of the flow gap width will be tested at a flow rate of 12 liters/second. Parameters such as mill power, turbine torque, and efficiency will be determined based on the measurement results of the rotational speed of the waterwheel wheel, water level, and braking load. The results showed that the width of the sluice gate flow gap affects the performance of the waterwheel. The highest performance was obtained at a flow gap of 25mm followed by a flow gap width of 35mm, and the lowest performance was obtained at a variation of the slit width of 40mm. The maximum performance of the waterwheel is obtained at variations in the width of the flow gap of 25mm at 50 rpm rotation conditions with a discharge of 12 liters/second where liters were generated 15.06 watts and the efficiency 29.82%.
PENGARUH TEMPERATUR CETAKAN TERHADAP STRUKTUR MIKRO DAN KEKERASAN PISTON HASIL PENGECORAN MENGGUNAKAN 3D PRINTING Devi Andriani; Wahyono Suprapto; Yudy Surya Irawan; Alfeus Sunarso
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1136

Abstract

Motorcycle users in 2019 reached 133,617,012 units in Indonesia. The impact of a large number of motorcycle certainly attracts the interest of the industry to produce two-wheeled automotive vehicles. The piston is part of the engine that functions as a compression barrier in the combustion chamber, the piston material is aluminum alloy. Therefore, research was carried out on making pistons with investment casting methods, physical and mechanical patterns from 3D printers on pistons. This research starts from drawing the piston using CAD (computer-aided design), making a printed pattern from a 3D Printer machine with PLA (polylactide acid) material. The mold pattern is coated with a mixture of gypsum cement and silica powder. The casting process with a pouring temperature of 750ᵒC and a mold temperature of 200 ᵒC, 250 ᵒC, 300 ᵒC, 350 ᵒC, and 400 ᵒC. The results showed the largest grain size at a mold temperature of 400ᵒC. The highest hardness at 200 ᵒC mold temperature is 47.00 HRB and the lowest hardness at 400 ᵒC mold temperature is 40.56 HRB. The higher the temperature of the mold used, the level of porosity of a material will decrease. This is due to the temperature difference when pouring the molten metal and the lower mold temperature. This makes the metal solidification time longer. The higher the mold temperature, the slower the solidification time, the larger the grain structure, and the decreased hardness.
Co-Authors . Agato Devi Andriani Dominikus Sulistiono Halasan Sihombing Ignatius Gunawan Widodo Ridho Dwi Syahrial Rudy Soenoko Teguh Dwi Widodo Wahyono Suprapto Yudy Surya Irawan