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심경석(Kyung-Seok Sim),박태원(Tae-Won Park) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
The abnormal vibration from the BTV(Brake Torque Variation) and DTV(Disc Thickness Variation) is transferred to the suspension and steering system during braking. In this paper, judder simulation is carried out using multi-body dynamic analysis program to analyze the relation of the judder and transfer mechanism which is composed of the suspension and steering system. In order to analyze the brake judder transfer system, the full vehicle model was composed with rigid body, non-linear bushing, non-linear constraints and joints. Full vehicle model analysis was compared by actual vehicle judder test and sensitivity analysis of the suspension system is carried out.
차세대 고속철도(HEMU-400X)의 주행 안전성 평가
심경석(Kyung-Seok Sim),박태원(Tae-Won Park),김욱현(Wook-Hyun Kim),최지훈(Ji-Hun Choi) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Recently a railway vehicle of the maximum speed of 350km/h or more high speed has been developed in the developed country. The next-generation railway vehicle(HEMU-400X) is being developed for aim to run over 430km/h in Republic of Korea too. The safety of the railway vehicle should be conformed before manufacturing the railway vehicle. In this study the next generation high-speed railway vehicle was modeled as a single-car system using commercial dynamic program ADAMS/Rail. Safety analysis was implemented through the international standard of the UIC 518 OR code. Also appropriateness of the railway vehicle design variable were conformed by safety analysis results.
도시철도차량 급곡선 주행 특성 및 대차 특성 최적화 방안
심경석(Kyung Seok Sim),박태원(Tae Won Park),정남호(Nam Ho Chung) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Creepage is the slip ratio of a rolling speed between a wheel and a rail. The creepage causes wear of a wheel/rail, noise and vibration, etc. so, the creepage must be minimized on a sharp curved track. So, the critical speed, derailment quotient, creepage, etc. are predicted by a numerical model of a railway vehicle previously extending a track line in advance to ensure the safety of a railway vehicle. In order to minimize some problems (noise, derailment, impact of a wheel/rail contact and wear) when a railway vehicle runs on a sharp curved track, characteristics of a bogie are optimized by the response optimization.