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All Journal Jurnal Pendidikan Teknik Mesin Automotive Experiences Jurnal Inovasi Mesin
Rahmat Doni Widodo
Fakultas Teknik, Universitas Negeri Semarang
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mechanical Engineering

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Karekteristik Dan Uji Pembakaran Biopelet Campuran Cangkang Kelapa Sawit dan Serbuk Kayu Sebagai Bahan Bakar Alternatif Terbarukan Muhammad Gifani Al Qadry; Danang Dwi Saputro; Rahmat Doni Widodo
Jurnal Inovasi Mesin Vol 5 No 1 (2023): APRIL 2023
Publisher : Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v5i1.68759

Abstract

Non renewable energy it’s limited in capacity, when the energy runs out it cannot be renewed. Then it needs renewable energy to solve this problem. Biopellet is one of the renewable energy alternatives from biomass. The purpose of this research to identify characteristics and quality of biopellet a mixture palm kernel shell and sawdust. Method that used in this research is experiment. The compositions of a mixture that used in experiment is 100% : 30%, 70% : 30%, 50% : 50%, and 30% : 70%. The manufacture of biopellet used a 80 mesh of dust with the pressure of 200??/??2. The result of the test showed moisture content 7.6 – 11 %, volatile matter 67.6 – 68.08 %, ash content 1.53 – 2.57 %, carbon bonded 19.38 – 22.23 %, calorific value 3563.05 – 4366.73 kal/g, and density 1.03 – 1.32 g/cc. The best quality of biopellet is biopelet Bwith percentage 70 % palm kernel shell and 30 % sawdust. Biopellet B is the best quality of biopellet with 23 minute burn out
ANALISIS VARIASI SISTEM SALURAN TERHADAP CACAT CORAN DAN KEKUATAN BENDING RUNNER SUDU 20 TURBIN CROSS-FLOW DENGAN METODE SAND CASTING Bramansyah Badar Islami; Kriswanto Kriswanto; Rahmat Doni Widodo; Rusiyanto Rusiyanto; Imam Sukoco; Muhammad Harits
Jurnal Pendidikan Teknik Mesin Vol 22, No 2 (2022): Jurnal Pendidikan Teknik Mesin
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v22i2.47376

Abstract

Tujuan Penelitian ini adalah untuk mengetahui bagaimana pengaruh variasi sistem saluran terhadap cacat coran dan kekuatan bending pada hasil pengecoran produk runner turbin cross-flow. Penelitian ini menggunakan metode eksperimen dengan variasi sistem saluran yang digunakan adalah 2 saluran langsung 1 riser, 2 saluran langsung 2 riser dan 2 saluran terpisah 2 riser, kemudian data tersebut dianalisis dengan menggunakan aplikasi infinity analyze dan kekuatan bending. Data hasil penelitian dianalisis secara makroskopik dan menggunakan grafik yang kemudian ditarik kesimpulan. Hasil penelitian ini didapatkan variasi 2 saluran langsung 2 riser dan variasi 2 saluran terpisah 2 riser terdapat cacat salah alir atau misrun, cacat sirip, cacat retakan, cacat penyusutan, sedangkan variasi 2 saluran langsung 1 riser terdapat terdapat cacat salah alir atau misrun, cacat sirip, cacat retakan, cacat penyusutan, dan cacat porositas. Nilai tegangan bending paling tinggi diperoleh dari variasi 2 saluran langsung 1 riser yaitu sebesar 160,741 MPa, nilai tegangan bending paling rendah yaitu variasi 2 saluran langsung 2 riser yaitu sebesar 109,134 MPa.
PENGARUH TEMPERATUR TUANG PADA PROSES PENGECORAN SAND CASTING TERHADAP KEKUATAN IMPAK DAN CACAT CORAN RUNNER TURBIN CROSS-FLOW SUDU 24 Aditya Lutfi Sulistyawan; Kriswanto Kriswanto; Rahmat Doni Widodo; Rusiyanto Rusiyanto; Suyitno Suyitno; Rachael Andika; Zaidan Priya Harsandi
Jurnal Pendidikan Teknik Mesin Vol 22, No 1 (2022): Jurnal Pendidikan Teknik Mesin
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v22i1.47374

Abstract

Tujuan penelitian ini adalah untuk mengetahui bagaimana pengaruh variasi temperatur tuang terhadap kekuatan impak dan cacat coran runner turbin cross-flow sudu 24 metode sand casting. Penelitian ini merupakan penelitian eksperimen, karena dalam penelitian ini akan dilakukan pengecoran runner turbin cross-flow. Variasi temperatur tuang yang digunakan adalah 650℃, 700℃, 750℃. Data hasil penelitian dianailis secara langsung, dibuat grafik, foto makro dan in-finity analyz kemudian ditarik kesimpulan dari hasil penelitian tersebut. Nilai kekuatan impak pada temperatur 600℃ sebesar 0,6247 J/mm2, temperatur tuang 700℃ sebesar 0,9778 J/mm2, dan pada temperatur tuang 750℃ sebesar 0,7290 J/mm2. Terdapat beberapa jenis cacat coran yang terjadi pada pengecoran runner turbin cros-flow sudu 24 yaitu salah alir dan sumbat dingin, penyusutan luar, retakan, sirip, kekasaran erosi, dan rontokan cetakan
A Study on Characteristics of Brake Pad Composite Materials by Varying the Composition of Epoxy, Rice Husk, Al2O3, and Fe2O3 Muhammad Khafidh; Finny Pratama Putera; Rahmadi Yotenka; Deni Fajar Fitriyana; Rahmat Doni Widodo; Rifky Ismail; Agustinus Purna Irawan; Tezara Cionita; Januar Parlaungan Siregar; Nur Hidayah Ismail
Automotive Experiences Vol. 6 No. 2 (2023)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9121

Abstract

The use of composite materials in brake pads is becoming increasingly popular due to their high-performance characteristics, including good thermal stability, high wear resistance, and low noise generation. However, the development of new composite materials that offer even better performance is still an ongoing research area. In this study, the composite was made by hand layup method using epoxy resin as matrix material, with rice husk, Al2O3, and Fe2O3 as reinforcing materials. The composition of the composites was varied by changing the percentage of the reinforcement materials. The composites were then subjected to several characterization tests, including density, hardness, flexural strength, thermal analysis, Scanning Electron Microscopy (SEM), TGA/DSC, and wear testing. The test results showed that additional reinforcement materials to the epoxy resin matrix improved the mechanical properties of the composites. Overall, the study demonstrates that a hand layup method is a viable approach for preparing brake pad composite materials and that the addition of rice husk, Al2O3, and Fe2O3 can improve the mechanical properties of the composites. The best properties produced in this research were found in one of the specimens which used epoxy, rice husk, Al2O3, and Fe2O3 with a composition of 50 wt.%, 20 wt.%, 15 wt.%, and 15 wt.%. However, the addition of rice husk also provides wear resistance and thermal stability. This study contributes to the Sustainable Development Goals (SDGs) by advancing innovation, promoting sustainability, and reducing emissions in automotive industry applications.
Fabrication and Characterization of Asbestos Free Brake Pads Composite using Elaeocarpus Ganitrus as Reinforcement Mohamad Afiefudin; Rahmat Doni Widodo; Rusiyanto Rusiyanto
Automotive Experiences Vol. 6 No. 2 (2023)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9367

Abstract

To minimize potential health hazards, there is awareness to avoid asbestos fibers in brake pads. Therefore, this study aims to produce composite brake pads using Elaeocarpus ganitrus seed powder as a substitute for asbestos. The composition of Elaeocarpus ganitrus seed powder was varied from 8%, 10%, and 12% by weight. The properties of the brake pads, including their morphology, physical characteristics, mechanical performance, and wear behavior, were thoroughly investigated and analyzed. The experimental results showed a positive correlation between the addition of 12% by weight of Elaeocarpus ganitrus and the increase in the density and hardness of the resulting sample. In addition, wear resistance increases with increasing percentage of Elaeocarpus ganitrus. Samples containing 12% by weight of Elaeocarpus ganitrus seed powder gave better properties compared to other composite samples. The research findings indicate that Elaeocarpus ganitrus particles can be an alternative to asbestos in the manufacture of brake pads.
Co-Authors Aditya Lutfi Sulistyawan Agustinus Purna Irawan Bramansyah Badar Islami Danang Dwi Saputro Finny Pratama Putera Fitriyana, Deni Fajar Imam Sukoco Januar Parlaungan Siregar Kriswanto Kriswanto Kriswanto Kriswanto Mohamad Afiefudin Muhammad Gifani Al Qadry Muhammad Harits Muhammad Khafidh Nur Hidayah Ismail Rachael Andika Rahmadi Yotenka Rifky Ismail Rusiyanto Rusiyanto, Rusiyanto Suyitno Suyitno Tezara Cionita Zaidan Priya Harsandi