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LuGre 마찰 모델을 이용한 트라이포드 타입 등속조인트 플런징력 해석 상관성 개선 연구
김진식(Jinsik Kim),곽병문(Byungmoon Kwak),백설(Serl Baik),박천일(Chunil Park) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
The Constant Velocity Joint(CVJ) is an important automotive part in the driveline system. There are various types of CVJs. CVJ consists of several parts and these work to 3-dimensions as they rotate and transmit torque to the tire and wheel. In these processes, CVJ"s parts generate friction force, dynamic force and vibration. These characteristic are very important about CVJ performance. So, many engineers have studied for a long time in variety of ways. In this paper, we developed an ADAMS-based CAE tool for automated model generation and standardized dynamic simulation of almost all kind of type CVJ for automotive driveline applications. We specifically study the tripod types of CVJ for plunging force. Plunging force is generally generated mainly when the vehicle is in idle stop. Plunging force is not correlated between test and simulation using coulomb friction model. So, we introduced the LuGre friction model and applied the tripod type CVJ of simulation model.
등속조인트 축력 저감을 위한 설계 변수 인자 분석과 반응 표면 모델을 이용한 축력 저감 연구
김진식(Jinsik Kim),곽병문(Byungmoon Kwak),백설(Seol Back) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Constant Velocity Joints(CVJ) are important part in automotive driveline components. Constant velocity joint transfer engine power to the chassis. Therefore, Noise, Vibration and Harshness performance and efficiency of Constant velocity joint are very important items. CVJ is composed of various parts that roller, ball, housing, trunnion, cage and so on. These parts contacted each other and the friction inside the joint generates an axial force according to the kinematics. It is generated noise and vibration problems. In this study, CVJ"s parts are modeling by using multibody dynamics. We are selected the design parameters effect on Generated Axial Force(GAF) and carry out the sensitivity analysis for GAF. Finally, minimize to the GAF though optimization method.
임승철(Seungchul Lim),곽병문(Byungmoon Kwak),임주영(Jooyoung Lim),손영익(Youngik Son) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.4
When biped robots make turns, the ability to walk stably and precisely along any circular path is crucial. In this context, inverse kinematics solutions are found for accurate gait realization, and new zero moment point(ZMP) equations are derived with respect to the cyclindrical coordinate system to facilitate generation of stable walking patterns. Then, appropriate steady and transitional walking patterns are both proposed in form of time functons. Subsequently, walking patterns for a path but of different speeds are generated using the functions and associated formulas, and preliminarily checked for stability based on the ZMP equations. Upon comparison of those cases, one can see how and when robots may fall down during circular walking. Finally, those patterns are put to test on the sample robot by ADAMS® along with the inverse kinematics solutions and a new balance control scheme compensating for insufficient stability particulary during the initial transition period. Test results show that the robot can walk along the circular path as predicted at a resonably high speed despite the distributed mass and ground contact effects, validating effectiveness of the suggested approach.