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All Journal Jurnal Rekayasa Mesin Journal of Mechanical Engineering and Applied Technology Journal of Mechanical Engineering and Fabrication
Elfrida Rizky Riadini
Politeknik Negeri Semarang
Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Jurnal Rekayasa Mesin

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Analisa Numerik Pengaruh Karakteristik Gelombang Air Laut pada Wave Energy Converter Tipe Bottom Hinge Menggunakan Metode Smoothed Particles Hydrodynamics An Nizhami, Avicenna; Riadini, Elfrida Rizky
Jurnal Rekayasa Mesin Vol 16, No 1 (2021): Volume 16, Nomor 1, April 2021
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v16i1.2472

Abstract

Energi terbarukan yang bersumber dari gelombang air laut  menjadi dasar penelitian ini. Penelitian ini bertujuan untuk menganalisa Wave Energy Converter (WEC) tipe bottom hinge menggunakan metode numerik Smoothed Particle Hydrodynamics (SPH). Dinamika gerak dari WEC didekati dengan persaman getaran torsional dengan memodelkan generator sebagai spring dan damper. Pada metode SPH domain penelitian didiskritkan menjadi partikel yang merepresentasikan partikel fluida dan partikel solid. Persamaan atur yang digunakan adalah konservasi massa dan momentum. Validasi menunjukkan bahwa metode SPH dapat dengan akurat meprediksi dinamika gelombang air laut. Gaya hidrodinamis dan energi yang dihasilkan oleh WEC mempunyai nilai yang fluktuatif namun dengan pola yang periodik.
Experimental and Numerical Study of Shock Absorber Characterization and The Implication on The Dynamics of Half Vehicle Suspension System Model An-Nizhami, Avicenna; Sriyanto, Nanang Budi; Sumiyarso, Bambang; Ulum, Showi Nailul; Riadini, Elfrida Rizky; Widodo, Ignatius Gunawan
Jurnal Rekayasa Mesin Vol. 18 No. 3 (2023): Volume 18, Nomor 3, Desember 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i3.5023

Abstract

This study aimed to characterized shock absorber damping for passenger comfort. The riding comfort of the vehicle has direct correlation to the damping characteristic of the shock absorber of the suspension system. Two different shock absorbers were experimentally evaluated, and their damping characteristics were integrated into a half-car model to study the vehicle's dynamic response to harmonic road disturbances. The investigation involved numerical simulations of the half-car model subjected to harmonic road disturbances, represented by a set of ordinary differential equations solved using the Dormand-Prince method. Experimental data yielded average damping forces of 502.77 N for shock-absorber #1 and 192.03 N for shock-absorber #2. Calculations resulted in damping coefficients of 3888.57 N ·s/m for shock-absorber #1 and 1397.85 N ·s/m for shock-absorber #2, with corresponding damping ratios of 0.29 and 0.105. These damping ratios generally aligned with typical values for passenger car shock absorbers, except for shock-absorber #2, which deviated from the expected range. The study found that at 60 km/h and 90 km/h, shock-absorber #1 with ζ=0.29 exhibited superior performance in reducing displacement amplitude compared to shock-absorber #2 at ζ=0.105. However, at 120 km/h, both shock-absorbers displayed similar responses, with shock-absorber #1 slightly surpassing shock-absorber #2 in displacement amplitude.
Co-Authors An Nizhami, Avicenna Antoro, Daffa Yudha Akbar Putra Apriandi, Nanang Apriandi Bambang Sumiyarso Ghozali, Hanif Faizal Huda, Muhamad Nurul Janitra, Atikah Ayu Marliyati Marliyati, Marliyati Nanang Apriandi Nanang Budi Sriyanto Padang Yanuar Setiawan, Trio Setyawan, Martando Robby Timotius Anggit Kristiawan Ulum, Showi Nailul Widodo, Ignatius Gunawan Yusuf Dewantoro Herlambang