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Nanang Apriandi
Politeknik Negeri Semarang
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Mass Ratio Influence on Vortex-Induced Vibration of a Flexible Cylinder using Large Eddy Simulation at Re=1000 An-Nizhami, Avicenna; Apriandi, Nanang; Setiawan, Trio; Kristiawan, Timotius Anggit; Riadini, Elfrida Rizky; Janitra, Atikah Ayu; Yanuar, Padang
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.
Application of a PEM Fuel Cell Engine as a Small-Scale Power Generator for Small Cars with Different Fuel Concentrations: Fuel cell engine Yusuf Dewantoro Herlambang; Wahyu Sulistiyo; Margana Margana; Nanang Apriandi; Marliyati Marliyati; Muji Setiyo; Jin Cherng Shyu
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.9225

Abstract

A fuel cell power generation system is a renewable energy system that works based on electrochemical processes and produces a direct electric current (DC). Specifically, a Proton Exchange Membrane (PEM) Fuel Cell can operate at low temperatures and produce an efficiency of around 40-60%. In this study, the performance test of the PEM Fuel Cell for power generation was carried out by supplying hydrogen gas using hydrogen from the electrolysis of the hydrogen generator with a variation of KOH catalyst solution with a concentration of 0.5 M; 1.0 M; 1.5 M; 2 M and using Ultra High Purity (UHP) hydrogen with various flow rates of 250 mL/min, 300 mL/min, 350 mL/min, 400 mL/min, 450 mL/min, and 500 mL/min. The test results showed that the output power of hydrogen produced by the electrolysis process was 10.8 W at a concentration of 1 M solutions at an input current of 20 A. The greater the concentration of the catalyst solution, the smaller the electrical power required for the electrolysis process. However, the hydrogen power supply produced by the hydrogen generator was not optimal, so it did not meet the needs of the PEM Fuel Cell. As a result, the PEM Fuel Cell could not work. Meanwhile, testing with UHP hydrogen produced the highest electrical power of 31.588 W at a flow rate of 450 mL/min with a load of 20 W. It indicates that the PEM Fuel Cell is optimal at the output power value with an efficiency of 69.80%.
Study on Solar Powered Electric Vehicle with Thermal Management Systems on the Electrical Device Performance Yusuf Dewantoro Herlambang; Wahyu Sulistiyo; Margana Margana; Nanang Apriandi; Septiantar Tebe Nursaputro; Marliyati Marliyati; Muji Setiyo; Wawan Purwanto; Muhammad Latifur Rochman; Jin Cherng Shyu
Automotive Experiences Vol. 7 No. 1 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10506

Abstract

This study aims to determine the reliability of applying a thermal management system in conjunction with Internet of Things in solar electric cars. In conventional electric cars or those whose driving energy source comes from gasoline fuel; the applied thermal management system is mainly used as a coolant for the internal combustion engine. However, for electric cars the thermal management system may be used for the main components such as controllers that convert solar module energy into electricity and batteries. Results from tests utilizing six DC fans for air cooling of the thermal management system yield two variations of battery charging conditions from the solar modules, namely variations of 25 and 400 turns of the trimmer constant current step-up charger. Test results from the proposed thermal management system show that the highest step-up charger temperature is 35.75 °C with voltage of 57.64 V for the variation of 25 laps. The test results on the battery voltage and temperature show that the highest battery temperature reaches 31.75 °C with voltage of 57.3 V at the variation of 25 rounds.
Modeling the Dynamics of a Passenger Car Using Experimental Data on Nonlinear Passive Shock Absorbers Avicenna An-Nizhami; Yusuf Dewantoro Herlambang; Nanang Apriandi; Bono Bono; Friska Ayu Fitrianti Sugiono; Ali Sai'in; Ignatius Gunawan Widodo; Padang Yanuar
Automotive Experiences Vol. 8 No. 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.12792

Abstract

This study explores the dynamic response of passenger cars equipped with nonlinear passive shock absorbers, emphasizing the nonlinear damping characteristics over traditional linear models in simulating real-world driving conditions. To capture the nonlinear damping behavior, experimental data from a shock absorber testing apparatus was utilized to derive an empirical formula. The damping force was modeled using a seventh-order polynomial equation, accurately representing the force-velocity relationship. This nonlinear damping model was integrated into a half-car suspension model, which was subjected to simulations involving two road profiles: a bump and an irregular sinusoidal road profile. Simulations demonstrated that the nonlinear model outperformed its linear counterpart, particularly in vibration control. It achieved significant reductions in body displacement, body acceleration, and suspension deflection, with notable improvements at resonance speeds. Root Mean Square (RMS) analysis further corroborated the nonlinear model's superior damping performance, showing lower displacement and acceleration values compared to the linear model. The findings indicate the effectiveness of nonlinear damping models in enhancing ride comfort and vehicle stability, providing a more realistic and effective framework for vehicle dynamic analysis compared to conventional linear approaches.
Trends, Advances, and Future Directions in Fuel Cell Electric Vehicle Performance: A Bibliometric Analysis Using the PAGER Framework Yusuf Dewantoro Herlambang; Nanang Apriandi; Komang Metty Trisna Negara; Rani Raharjanti; Lily Maysari Angraini; Abdul Syukur Alfauzi; Marliyati Marliyati
Automotive Experiences Vol. 8 No. 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.13111

Abstract

The global shift toward sustainable transportation has positioned fuel cell electric vehicles (FCEVs) as a key zero-emission mobility solution. Despite notable technological progress, FCEV adoption faces persistent barriers including high hydrogen production costs, limited infrastructure, and lack of real-world validation. This study employs the Pattern, Advance, Gap, Evidence for Practice, and Research Recommendation (PAGER) framework to conduct a comprehensive bibliometric analysis of 200 peer-reviewed publications from 2005 to 2024, focusing on performance trends, technological advancements, research gaps, practical applications, and future research directions. The analysis uses Scopus data and VOSviewer for visualization and thematic mapping to identify three distinct research phases: early exploration, gradual refinement, and rapid technological maturity. Key findings highlight advancements in energy management strategies, hybrid powertrain integration, and hydrogen storage optimization. However, critical gaps remain in economic modeling, behavioral adoption analysis, and infrastructure scalability. This study offers a structured roadmap for future research and practice, emphasizing the need for dynamic total cost of ownership models, interdisciplinary policy interventions, and real-world pilot projects. The findings serve as a strategic reference for academics, industry stakeholders, and policymakers to accelerate the global transition to sustainable FCEV-based transportation systems.
Co-Authors Abdul Syukur Alfauzi Ahmad Hamim Su’udy Ali Sai'in Aminuyati An Nizhami, Avicenna Asih Priyati Aulia, Nur Fatowil Avicenna An-Nizhami A’tohillah, Muhammad Khusnul BAKTIYAR MEI HERMAWAN Berkah Fajar Tamtomo kiono Bono Bono Budhi Prasetiyo Dwiana Hendrawati Elfrida Rizky Riadini F Gatot Sumarno, F Gatot F. Gatot Sumarno, F. Gatot Friska Ayu Fitrianti Sugiono Giarno Giarno Hatmoko, Sumantri Hermawan, Baktiyar Mei Hidayat, Agriananta Fahmi I Gusti Bagus Wijaya Kusuma I Made Sudana I Made Widiyarta I Nyoman Gede Baliarta Ignatius Gunawan Widodo Ignatius Gunawan Widodo Ilfiani , Pratiwi Dian Janitra, Atikah Ayu Jin Cherng Shyu Khoiri Rozi Khoirunnisa, Hilma Kholifah, Nevita Nur Khoryanton, Ampala Khusna, Atina Nurul Komang Metty Trisna Negara Komang Metty Trisna Negara Kusuma, Mukhsinun Hadi Lily Maysari Angraini Lily Maysari Angraini Luthfiana, Nadia Tasya Ayu Made Ery Arsana Margana Margana Margana Margana Margana Margana Mariani, Dina Marliyati Marliyati Marliyati Marliyati, Marliyati Mochammad Denny Surindra Muhammad Latifur Rochman Muhammad Yunus Muji Setiyo Mulyono Mulyono Nabila, Lathifa Dylla Nantana, Nining Rara Negara, Komang Metty Trisna Nizami, Avicenna An Nur Fatowil Aulia Nurul Qomariyah Padang Yanuar Padang Yanuar Padang Yanuar Pambudi, Yoyok Dwi Setyo Prakoso, Raden Gumilang Aji Pramesywari, Afifa Purwanto, Wawan Rachman, Iqo Yovie Rani Raharjanti Rani Raharjanti Restiawan, Muhammad Mika Ramadhani Ribka Stephani Sai'in, Ali Satito, Aryo Septiantar Tebe Nursaputro Setiawan, Trio Setiyawan, Trio Setyowati, Nur Sirajuddin Haji Abdullah Slamet Priyoatmojo, Slamet Sofia Loren Butarbutar, Sofia Loren Sudirman Supandi Supriyo Supriyo Surya Abdul Muttalib, Surya Abdul Suseno, Sigit Sutanto, Bayu Suwarti Suwarti Su”™udy, Ahmad Hamim Timotius Anggit Kristiawan Totok Prasetyo Totok Prasetyo Ulum, Muhammad Showi Nailul Wahyono Wahyono Wahyu Isti Nugroho Wahyu Sulistiyo Wibowo, Andryana Dwiandara Widodo, Ignatius Gunawan Wirza, Alif Rahman Wiwik Purwati Widyaningsih Yanuar Mahfudz Safarudin Yusuf Dewantoro Herlambang Yusuf Dewantoro Herlambang Yusuf Dewantoro Herlambang Zainal Abidin Zulhan Widya Baskara Zulkarnaen Zulkarnaen