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이창석(Changseok Lee),백승환(Seunghwan Baek),제우성(Woosung Che),부광석(Kwangsuck Boo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper presents a robust estimation method of the vehicle dynamic behavior by using fusion sensors installed in suspension modules. The fusion sensor has been developed to measure 3-way accelerations and one way relative velocity between a sprung and an unsprung mass for semi-active suspension control. This paper proposes a new sensor fusion algorithm which can estimate the yaw rate and a lateral velocity of the vehicle at the center of gravity with strong robustness. The vehicle model with 6 degree of freedom was used for this work, and the normal forces between a tire and road were also estimated to calculate the accurate tire forces at each contact patch. A Kalman filter was designed to estimate the yaw rate and the lateral velocity and could also provide a covariance of the estimation error at each sensor module pair. A developed sensor fusion algorithm could provide robust estimated outputs of the vehicle dynamic parameters as well as sensor status. The performance of the proposed sensor fusion algorithm was evaluated via computer simulation study by utilizing commercial software of CarSim. The results show that the dynamic behavior of the vehicle can be estimated with satisfied accuracy even though in situation of sensor fail.
이정석(Jungsuk Lee),윤문영(Moonyoung Yoon),양갑진(Kapjin Yang),송정훈(Jeonghoon Song),제우성(Woosung Che),부광석(Kwangsuk Boo),김흥섭(Heungseob Kim5) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The fundamental reason of noise in gear system is transmission error due to deflection of gear teeth. The vibration from transmission error moves to shaft and bearing. This vibration generates bearing force which exite gear box and finally radiate as noise outside. Therefore, studying transmission error is the most important to predict which is the fundamental reason of gear noise. In this paper, transmission error due to teeth deflection was predicted and shaft torsion was not considered in order to find only teeth deflection. For this reason, shaft was modeled as rigid, and only gear pair was modeled as flexible body. transmission error was predicted by Abaqus, FEA program, and this was compared for Spur and Helical type.