Chuyên đề: The multiphysics of mechanical system and multibody motion

Người trình bày: Prof. Daesung Bae, Ph.D.
Department of Mechanical Engineering
Hanyang University, Seoul (Korea)

Thời gian: 8h30 Sáng Thứ năm 31/10/2019

Địa điểm: Hội trường B11

Từ 10h30 sẽ phỏng vấn Học bổng Sau đại học Trường ĐH Hanyang, Korea

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Title: The multiphysics of mechanical system and multibody motion

Prof. Daesung Bae
Department of Mechanical Engineering
Hanyang University, Seoul (Korea)

The multibody dynamic analysis covers rigid body motion, flexible body deformation, system and component eigenvalue analysis, frequency response analysis, fatigue analysis, heat analysis, hyper elastic and plastic deformation. Rigid body motion is a main source of large displacement of mechanical system. In addition to the rigid body motion, deformation is added to on top of the rigid body motion. The analysis methods are different for the small deformation and large geometric nonlinear motion. Both methods are presented. When the size of a model is huge, a special numerical method is necessary to minimize the cpu time and affordable memory. Such numerical methods will be discussed. Even if the automeshing method becomes very popular, the quality of the automatically created mesh is not suitable to produce the accurate solution. Meshfree method is developed to overcome the difficulty. The meshfree method and its application problems will be presented. Application problems will include the accuracy and convergence of the meshfree method in many examples. Contact mechanics is a very important problem to predict the dynamic motion of mechanical systems. A noble method to solve the contact mechanics is presented. How to improve the smoothness of the contact patch will be discussed. Searching method is very important to find the contact point in short time. The searching algorithms are presented.
The constant velocity joint fatigue problem is solved by the proposed method. The modeling method and predicted solution, and experimental results will be compared. Vane pump example will be analyzed to predict its noise and vibration problem. To show the validity of the hyper elastic rubber motion, chassis mounting rubber bush is analyzed when a vehicle goes through a lane change maneuver. The experimental results will be compared. Many more examples will be presented.
Finally, interface with other software such as fluid dynamics electro magnetics is presented to solve multiphysics problem.

Biography: Daesung Bae received the B.S. degree from Hanyang University, Seoul, Korea in 1982 and M.S. and Ph. D. from University of Iowa, Iowa city, in 1983 and 1986, majoring in mechanical engineering. He was a senior researcher for two years at University of Iowa. He became an assistant professor at University of Kansas during 1988 ‐1991. He served as a design engineer for one year at BAE systems. He is currently a professor at Hanyang University, Seoul, Korea since 1993. His research interests include formulation of multibody rigid dynamics, finite element development for large deformation, plasticity, nonlinear material modeling, numerical analysis for linear systems, and parallel processing. He founded a CAE company VirtualMotion and is developing Daful software, which analyzes multi flexible and rigid body behavior on the time domain.