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All Journal Rekayasa Mesin Journal of Mechanical Engineering Science and Technology Jurnal Elemen JTAM ROTARY
Putra, Muhammad Rezki Fitri
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Kecepatan Pengadukan Proses Rheocasting terhadap Struktur Mikro dan Fluiditas Paduan Al-Cu Putra, Muhammad Rezki Fitri; Suprapto, Wahyono; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.6

Abstract

Rheocasting with the aim of developing and offering solutions to problems related to the casting process. Rheocasting is a casting process that utilizes solidification agitation to change the dendritic structure to non-dendrite (globular) by giving a variation of the stirring speed. Al-Cu is a metal material that has high strength-to-weight ratio characteristics from steel, good fatigue resistance, and heat-treatable. But fluidity is low, this triggers casting defects such as shrinkage and miss-run. The defect occurs because the cooling process of liquid metal is not uniform or there is gas trapped in molten metal. Defects in casting can significantly reduce material mechanical properties. The results show morphological changes in the dendrites to rosette to globular with increased stirring speed and grain diameter decreasing with increasing stirring speed. Increasing the stirring speed also produces a positive trend of the fluidity value of Al-Cu alloys in each mold thickness.
PENGARUH DIAMETER PIPA NOZZLE PADA KINERJA TURBIN AIR PELTON SKALA LABORATORIUM Syaief, Adhiela Noer; Isworo, Hajar; Ivana, reza Taufiqi; Putra, Muhammad Rezki Fitri; Yasin, Muhammad Noor
ELEMEN : JURNAL TEKNIK MESIN Vol. 11 No. 1 (2024)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v11i1.276

Abstract

Pelton turbine is an energy conversion medium that utilizes flow performance as a driver and produces electrical energy due to the conversion of turbine rotation. The turbine works when the turbine nozzle injects flow towards the tip of the nozzle which leads directly to the inlet surface of the turbine blade. In this research, we know the effect of nozzle diameter on the performance of turbines that produce different electrical power from various parameters, namely: nozzle diameter used; 1", ¾", 1 ½", and ½" with various nozzle opening variations of 20%, 50%, and 100%. The results obtained with a nozzle diameter of ¾" obtained maximum results with a rotation of 177 (rpm), with a power of 5,168 watts and efficiency increased to 5% at each nozzle valve opening. From these results it can be said that the magnitude or size of the nozzle influences the performance of the turbine where the efficiency of the performance is directly proportional to the rotation and power produced.
ANALISA EFISIENSI LAJU PENDINGINAN REFRIGERAN R-32, R-134A, R410A, DAN LPG PADA SIMULATOR REFRIGERATOR Ivana, Reza Taufiqi; Musthofa, Imron; Putra, Muhammad Rezki Fitri
JTAM ROTARY Vol 5, No 2 (2023): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v5i1.8416

Abstract

Efisiensi sistem refrigeran dengan fungsi sebagai fluida yang menyerap panas dalam sistem sehingga terjadi penurunan suhu  melalui mekanisme evaporasi dan kondensasi. Percobaan ini dilakukan untuk mengetahui refrigeran yang mempunyai dampak laju pendinginan terbaik dengan tingkat temperatur yang berbeda sehingga dapat diamati laju pendinginan dari refrigeran R-134a, R-32, R-410a, dan LPG. Dalam prakteknya menggunakan simulator pendingin sebagai media pembelajaran dalam menerapkan prinsip kerja mesin refrigerasi. Metode penelitian yang dilakukan adalah dengan mengukur temperatur pada waktu 30 detik untuk pengambilan 1 data dan pengambilan data dilakukan selama 300 detik untuk menghasilkan 10 data pada tiap jenis refrigerant pada tekanan 10 Psi. Hasil penelitian menunjukkan refrigerant jenis LPG memiliki tingkat penurunan temperatur paling rendah diantara jenis refrigerant yang lain. Hal ini dikarenakan kinerja LPG dengan ODP sama dengan nol dan nilai GWP rendah. Kesimpulannya sistem pendingin domestik dapat menggunakan refrigeran jenis LPG di untuk penurunan temperatur yang lebih rendah. Refrigerant system efficiency by functioning as a fluid that absorbs heat in the system resulting in a decrease in temperature through evaporation and condensation mechanisms. This experiment was conducted to find out which refrigerant has the best cooling rate effect at different temperature levels so that the cooling rates of R-134a, R-32, R-410a, and LPG refrigerants can be observed. In practice using a cooling simulator as a learning medium in applying the working principles of refrigeration machines. The research method used is to measure the temperature for 30 seconds for 1 data collection and 300 seconds for data collection to produce 10 data for each type of refrigerant at a pressure of 10 Psi. LPG type refrigerant has the lowest temperature drop among other refrigerant types. This is because the performance of LPG with ODP is equal to zero and GWP is low. In conclusion, domestic refrigeration systems can use LPG type refrigerants for lower temperature drops.
Friction Modeling of Composite Brake Pads with Ulin Wood Powder (Eusideroxylon zwageri) Putra, Muhammad Rezki Fitri; Isworo, Hajar; Yasin, Muhamad Noor; Subagyo, Rachmat
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 2 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i22024p520

Abstract

This study investigates the performance of composite brake pads made of Ulin (Eusideroxylon zwageri) sawdust using simulation modeling, focusing on the pressure distribution, frictional stress, and contact state in five brake pad designs (DS0 to DS4). The brake pad designs used U-shaped grooves to improve cooling efficiency and debris removal. The results show that DS1 and DS2 exhibit the most uniform pressure distribution, with maximum values of 0.045 MPa and 0.048 MPa, respectively. DS1 recorded the highest peak frictional stress at 2.53 × 10-8 MPa, while DS2 showed consistent stress stability, reducing the possibility of uneven wear. DS3 achieved a balanced performance, with a maximum pressure of 0.062 MPa and a stable frictional stress distribution. In contrast, DS4 showed the highest stress (0.072 MPa) and increased “sliding” contact area, indicating reduced braking efficiency and potential for faster wear. Contact condition analysis showed predominantly “sticky” conditions on DS1, DS2, and DS3, which contributed to effective braking performance, while DS4 exhibited significant “sliding” conditions, which reduced friction efficiency. These findings confirm the potential of Ulin sawdust as an environmentally friendly brake lining material, with DS1 and DS2 emerging as the most suitable designs to achieve optimal braking performance and long life.
Co-Authors Isworo, Hajar Ivana, Reza Taufiqi Muhamad Noor Yasin Musthofa, Imron Rachmat Subagyo Sonief, Achmad As’ad Syaief, Adhiela Noer Wahyono Suprapto Yasin, Muhammad Noor