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차량 로드 휠의 복합축 평가 프로세스 구축을 통한 내구신뢰성 강건화 및 주행안정성 향상
정수식,유연상,김대성,Chung, Soo Sik,Yoo, Yoen Sang,Kim, Dae Sung 한국자동차안전학회 2016 자동차안전학회지 Vol.8 No.1
The steel road wheel on ventilation holes was cracked in the vehicle durability test. But the component durability test by uni-axial, CFT(Cornering Fatigue Test) and RFT(Radial Fatigue Test) had been satisfied. That is, the uni-axial component test could not forecast the crack of vehicle. Therefore this study developed the bi-axial test mode to reflect a vehicle condition(to reflect both vertical and lateral force simultaneously) based on real load data which was measured in Europe and China and developed CAE simulation too. It reproduced the cracks same as vehicle's and verified by bi-axial test machine in the LBF(Fraunhofer Institute for Structural Durability and System Reliability) durability research center in Germany. Finally this the durability CAE simulation by using HMC(Hyundai Motor Company)'s the bi-axial test mode predicts feasibly the steel wheel's durability performance before vehicle durability test.
스틸 휠 굽힘 모멘트 내구시험의 내구신뢰성 개선에 대한 연구
정수식(Chung Soo Sik),정원욱(Jung Won Wook),유연상(Yoo Yeon Sang),강우종(Kang Woo Jong),김대성(Kim Dae Sung),권일기(Kwon iL Ki) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The failure mode of steel road wheels in a vehicle is cracks from ventilation hole through to contact plane on steel wheel’s disc plate. But a number of cracks of Cornering Fatigue Limit Test is on contact plane near to wheel nut mounting area, even though it’s satisfied with specified cycles. So this paper searches out causes to improve durability and reliability of C.F.T by uni-axial bending moment test. The verified cause is a “fretting” on contact area of steel wheel. In result, this paper suggests a solution to prevent a fretting by inserting a damping shim, 0.7㎜ between steel wheel contact areas. Therefore this paper makes it possible to move crack position of C.F.T in steel wheel from contact plane to vehicle’s failure mode.
휠 얼라이먼트 값과 타이어 편마모 영향도 평가 및 분석
정수식(Chung Soo Sik),정원욱(Jung Won Wook),이상주(Lee Sang Ju),고범진(Koh Bum Jin),최영삼(Choi Young Sam) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The tire uneven wear has been an ongoing concern for a long time, and one of customer's complaints too. This paper deals with uneven wear improvement of passenger car tires, to have tested the tire wear levels by each wheel alignment set (according to changing toe and camber) using taxis. The pre-set wheel alignments on test vehicle were gained by energy friction simulation of tire. The result of this experiment was as follows : First, verified the effects of initial wheel alignment (adjusted at Curb Vehicle Weight) to minimize tire uneven wear. Second, tire uneven wear makes tire life much shorter than even wear does.