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All Journal Rekayasa Mesin Jurnal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin Indonesian Journal of Chemical Analysis (IJCA) Infotekmesin Jurnal Mekanik Terapan Journal of Applied Mechanical Engineering and Renewable Energy (JAMERE) Sewagati International Journal of Renewable Energy Development Jurnal Polimesin
Fatah, Misbakhul
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OPTIMIZATION OF CALIPER BRACKET DESIGN AS AN EFFORT TO IMPROVE FUEL EFFICIENCY Wilujeng, Auliana Diah; Fatah, Misbakhul; Ridwan, Muhammad
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1911

Abstract

Ragapadmi's automobile was modified by the Sevta team so that it could compete in the KMHE race. To increase fuel efficiency, the car's materials and design were altered. In order to decrease excessive friction in the brake system, the caliper bracket needed to be adjusted. Lightweight and simple materials also needed to be used when doing repairs. Therefore, to minimize caliper friction when not braking, a perfect bracket is required. Three different caliper bracket designs were created to create a suitable (strong, light, and precise) bracket that can resist the 569.43 N braking force of the Ragapadmi automobile. Utilizing CAD and CAM tools to simulate strength, the strength of the brackets and materials is tested by creating a CNC toolpath program. The aluminium 6061 material used to make the calliper bracket is robust, lightweight, and precise. Following strength modelling, model 3 provides a mass of 0.099567 kg and a deflection value of 0.084 mm. The caliper bracket was machined in 174.86 minutes using a CNC milling machine, and its roughness value is 0.432µm, or N5 roughness class.
Biodiesel Synthesis with Different Feedstock Oils: Free Fatty Acid Analysis and Fuel Properties Characterization Hamid, Abdul; Badrus Syafa', Muhammad; Esti Purbaningtias, Tri; Rahmawati, Zeni; Fatah, Misbakhul; Wahyuni, Tri; Dayi Febriana, Ike; Abdullah , Mohammad; Rohmah, Faizatur
Indonesian Journal of Chemical Analysis (IJCA) Vol. 9 No. 1 (2026): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol9.iss1.art2

Abstract

The present study evaluates the feasibility of non-edible and waste oils as sustainable feedstocks for biodiesel production through a two-step esterification–transesterification process. Waste cooking oil, Calophyllum inophyllum oil, and sunflower oil were employed as raw materials, with sodium hydroxide used as the base catalyst during transesterification. The initial free fatty acid content varied significantly among the feedstocks, ranging from 29.38% in Calophyllum inophyllum oil to 3.20% in waste cooking oil and 1.28% in sunflower oil. Acid-catalyzed esterification effectively reduced the free fatty acid levels, enabling efficient conversion during the subsequent transesterification step. Fourier transform infrared spectroscopy confirmed the successful formation of fatty acid methyl esters, indicated by the presence of characteristic ester functional group absorption bands. Methyl oleate is the dominant component in all biodiesel samples, reaching 83.12% in sunflower oil biodiesel. The produced biodiesel exhibited kinematic viscosities of 4.61-5.63 cSt and flash points of 164-175 °C, meeting ASTM D6751 specifications.
Co-Authors Abdan Syakura Abdul Hamid Abdullah , Mohammad Anam, Soffatul Annafiyah Annafiyah Auliana Diah Wilujeng Badrus Syafa', Muhammad Dayi Febriana, Ike Dewi, Ratna Ayu Pawestri Kusuma Diah Wilujeng, Auliana Dwi Wijaya, Septian Esti Purbaningtias, Tri Febriana, Ike Dayi Ferly Isnomo Abdi Fikri, Mohammad Anas Hadiwijaya, Lukman Hasan, Sayyid Imanto, Frenki Jakfar, Amin Muhammad Ridwan Putra Rahadina, Dirhamsya Rahman Hakim Rahmawati, Zeni ROHMAH, FAIZATUR Saiful, S. Sufi, Achmad Hikam Ulul Syafa, Muhammad Badrus Tri Esti Purbaningtias tri wahyuni Ulfah, Nadiyah Ulfiyah, Laily Wijaya, Septian Wijaya, Septian Dwi Wilujeng, Auliana Yoanda, Ilham