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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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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.
Mass Ratio Influence on Vortex-Induced Vibration of a Flexible Cylinder using Large Eddy Simulation at Re=1000 Avicenna An-Nizhami; Nanang Apriandi; Trio Setiawan; Timotius Anggit Kristiawan; Elfrida Rizky Riadini; Atikah Ayu Janitra; Padang Yanuar
Journal of Mechanical Engineering and Applied Technology Vol 2, No 1 (2024): VOLUME 2 ISSUE 1 YEAR 2024 (MARCH 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i1.5498

Abstract

The study investigates the phenomenon of vortex-induced vibration (VIV) using Large Eddy Simulation (LES) at a Reynolds number of 1000, focusing on transitional flow conditions. LES has proven effective in understanding VIV across Reynolds number regimes, aiding in comprehending flow physics and mechanisms behind VIV. The research aims to contribute data for validating numerical models and informing engineering practices. The study employs the Navier-Stokes equation and the continuity equation to analyze fluid flow, treating it as incompressible due to negligible density changes. The three-dimensional incompressible momentum equation is discretized using the finite volume method within the spatial domain. Resolution of the pressure Poisson equation ensures compliance with free divergence conditions, enhancing computational fluid dynamics simulations' reliability. Validation of the fluid flow solver involves comparing computed drag force coefficients with established benchmarks, showing agreement within small discrepancies. The study delves into vibration behavior induced by cross flow at various reduced velocities (), noting distinct patterns ranging from irregularities at low  to quasi-periodic behavior at higher values. Analysis of maximum cylinder displacement () across different reduced velocities and mass ratios underscores the complex relationship between system parameters and displacement dynamics. A consistent occurrence of y_max at a specific reduced velocity highlights its significance, while varying mass ratios affect displacement patterns, indicating the importance of understanding these dynamics for optimizing fluid-structure interaction systems.
Experimental and Numerical Study of Shock Absorber Characterization and The Implication on The Dynamics of Half Vehicle Suspension System Model Avicenna An-Nizhami; Nanang Budi Sriyanto; Bambang Sumiyarso; Showi Nailul Ulum; Elfrida Rizky Riadini; Ignatius Gunawan Widodo
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.
Solar radiation monitoring system for electric vehicle charging using solar modules based on the Internet of Things Herlambang, Yusuf Dewantoro; Huda, Muhamad Nurul; Antoro, Daffa Yudha Akbar Putra; Ghozali, Hanif Faizal; Setyawan, Martando Robby; Apriandi, Nanang Apriandi; An-Nizhami, Avicenna; Yanuar, Padang; Riadini, Elfrida Rizky; Marliyati, Marliyati
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 1 (2025): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i1.17

Abstract

The utilization of solar energy to support electric vehicle charging still faces challenges related to efficiency and real-time solar radiation monitoring. Addressing this issue is critical given the importance of optimizing renewable energy to facilitate the transition toward sustainable transportation. This study offers a solution through the development of an Internet of Things (IoT)--based solar radiation monitoring system capable of measuring solar light intensity in real time. The system employs a BH1750 sensor integrated with an ESP32 microcontroller to process data, transmit it to the Firebase Realtime Database, and display it via an Android application. The methodology encompasses the design, implementation, and testing of the system on an electric vehicle placed in an open area for 10 hours of observation. Results indicate that the highest light intensity, recorded at 98,321 lux, corresponded to solar radiation of 776.74 W/m², while the lowest light intensity, 69 lux, resulted in radiation of 0.55 W/m². The implications of this research include enhanced efficiency in electric vehicle charging, the advancement of IoT-based solar energy systems, and the potential integration with energy storage technologies and predictive algorithms to improve energy sustainability.
Co-Authors An Nizhami, Avicenna Antoro, Daffa Yudha Akbar Putra Apriandi, Nanang Apriandi Atikah Ayu Janitra Bambang Sumiyarso Ghozali, Hanif Faizal Huda, Muhamad Nurul Ignatius Gunawan Widodo Marliyati Marliyati, Marliyati Nanang Apriandi Nanang Budi Sriyanto Padang Yanuar Padang Yanuar Setyawan, Martando Robby Showi Nailul Ulum Timotius Anggit Kristiawan Trio Setiawan Yusuf Dewantoro Herlambang