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성재혁(Jaehyuk Sung),장진희(Jinhee Jang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, an approach for the development of impact harshness performance on occasion of bump transverse was presented. Since the detection of the actual impact performance without any loss of physical meaning is the most important thing, body structure and some chassis parts are considered as flexible bodies. The FTire model proper for impact harshness simulation was used. The comparison with experimental measurements was also presented for validation and correlation of the analysis model. Simulation results for a sports utility vehicle (SUV) were presented and qualified for the improvement of impact harshness performance.
성재혁(Jaehyuk Sung),이명복(Myungbok Lee),원영섭(Youngsub Won) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the installation method of A/F meter which is used for objective measurement of the characteristics of steering systems is classified into two types, direct and indirect method, and static and dynamic test results are analyzed. Dummy wheel of A/F meter is connected to steering column in direct installation method, and is installed on steering wheel in indirect method. Each method produces different results according to the relative position of geometric center, rotation center and mass center of steering wheel.
서강원(Kangwon Seo),성재혁(Jaehyuk Sung),홍경민(Kyungmin Hong),김억(Ok Kim),전용(Yong Chun) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Thermoplastic Vulcalnizations (TPV) was examined to be applied to the rubber parts like guard-valve-body and diaphragm in brake systems. Automotive rubber parts exposed to harsh environmental conditions and duration criteria unlike other industries, are not easy to be replaced with environmentally-friendly thermoplastic material. In Industrial conditions in addition to other polymer material fields, automotive rubber materials have difficuties to meet the friendly-environment conditions. In this study, TPV of PP/EPDM compounds close to the rubber properties in the middle of Thermoplastic Elastomer (TPE) were applied to the rubber parts in the needs like durabilities. Properties were inferior to thermoset rubber, but products performance requirements were satisfied. In brake systems, Guard-valve-body is able to protect the valve-body of booster from foreign matters and to control the air inlet, and Diaphragm is able to induce pressure between the two different rooms and to seal. When TPV of PP/EPDM was apllied for both guard-valve-body and diaphragm, properties results seems to be appropriate in the given environmental conditions. Satisfactory behaviors in automotive parts conditions were able to be determined with PP/EPDM in performance and durability.
차량의 승차감 및 핸들링 성능 개발을 위한 전륜 로어 콘트롤암 부싱의 신뢰성 기반 최적화
정관면(Kwanmyun Jung),김지언(Jieon Kim),성재혁(Jaehyuk Sung) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
This paper describes front LCA bushing optimization for R&H performance development considering reliability. The front lower control arm bushing is one of the most important components which transfer forces and moments to vehicle body structure. Especially, these are key factors to determine R&H performance such as steering feel, understeer and impact hardness. Therefore, LCA bushing should be optimized for well-balanced vehicle R&H performance. In this study, stiffness and damping characteristic of rubber bushing mainly were considered as design variable. For R&H simulations, vehicle model based on multi body dynamics, the TNO Swift tire and flexibility component were used. Also sensitivity analysis was performed with respect to design variables using DOE based on Latin hypercube and orthogonal array method. Optimization work was conducted using sequential quadratic programming and response surface model to predict performance of CAE model. To take manufacturing tolerance of bushing into consideration, optimization based on reliability was proceeded.