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Padang Yanuar
Jurusan Magister Teknik Mesin Fakultas Teknik UNDIP Jl. Prof. Sudharto SH Kampus Undip Tembalang Semarang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation

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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.
Optimization of soldering quality using poka-yoke and camera-based inspection to prevent incomplete production cycle: a case study in automotive stator assembly Khoryanton, Ampala; Yanuar, Padang; Aditya, Dwiky Septian; Mujiarto, Iman; Tristijanto, Hery; Alfauzi, Abdul Syukur; Sunarto, Sunarto; Sriyanto, Nanang Budi
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7203

Abstract

This study was conducted at a manufacturing company located in Indonesia that produces Alternating Current Generator Starters (ACGS). In the ACGS production process, there is a solder inspection stage that was previously performed manually by operators. The main issue encountered is incomplete production cycles, a condition where a production cycle is not fully completed, but the product continues to the next stage, increasing the risk of undetected defective or rejected products. Research aims to design a camera check system that integrates the Poka-Yoke method to enhance accuracy and prevent errors caused by human factors based on continuous improvement through the Plan, Do, Check, Action (PDCA) cycle. This study compares two camera inspection programs: program model 1, with individual position calibration per solder point, and program model 2, with a shared calibration setup, to evaluate inspection effectiveness. The quantitative comparative testing results show a detection accuracy of up to 99.92% and an inspection result classification accuracy reached 99.73%, indicating a significant improvement in the reliability of the visual inspection system and quality assurance for soldering results in industry.
Co-Authors Abdul Hamid Aditya, Dwiky Septian Agus Pramono Alfauzi, Abdul Syukur Alisyafa’at, Ahmad Dhimas Aminuyati An Nizhami, Avicenna Andreyanto W, Mirda Anggit, Timotius Antoro, Daffa Yudha Akbar Putra Apriandi, Nanang Apriandi Ardjo, Anwar Sukito Arif Pambekti Aulia, Nur Fatowil Ayu Janitra, Atikah Ayu S, Friska Bono Bono Budhi Prasetiyo Dwiana Hendrawati Elfrida Rizky Riadini Farhan, Muchamad Ghozali, Hanif Faizal Gunawan Widodo, Ign. Hartono Hartono Hery Tristijanto Huda, Muhamad Nurul Iyadul, Fatih Janitra, Atikah Ayu Khoryanton, Ampala Lilin Hermawati Marliyati Marliyati, Marliyati Mulyono Mulyono Nailul Ulum, Muhammad Showi Nanang Apriandi Nanang Budi Sriyanto Nizami, Avicenna An Oktariza, Gio Prihatmini, Eri Purnomo, Adhy Putri, Farika Tono Rani Raharjanti Safriana, Eni Sai'in, Ali Saputro, Raynaldi Satito, Aryo Setiawan, Trio Setiyawan, Trio Setyawan, Martando Robby Slamet Priyoatmojo, Slamet Sri Harmanto Sriharmanto, Sriharmanto Sugiono, Friska Ayu Fitrianti Sunarto Sunarto Supandi Suwarti Suwarti Tengku Riza Zarzani N Timotius Anggit Kristiawan Tristidjanto, Hery Wahyono Wahyono Wahyu Isti Nugroho Widodo, Ignatius Gunawan Wiwik Purwati Widyaningsih yatimah, Dhurotul Yoeli Janto, Yoeli Yusuf Dewantoro Herlambang Zaenal Abidin