一、时间
2019年11月1日星期五，15：30-17：00
二、地点
机械楼D530
三、主讲人
Prof. Cho Wing S. To, ASME Fellow
四、报告摘要
The interaction problem of wheel-rail systems has received considerable attention from concerned researchers and engineers over the years. Central to this problem is the dynamic responses at the contact areas since they are responsible for many damages to the rail over time. In particular, the dynamic responses at the contact areas between the wheels and rails present challenges in the understanding and mathematical modeling. Even with the computer power one has today, its mathematical modeling, employing the versatile numerical analysis method, the finite element method (FEM) remains a formidable task due to its extremely small contact areas and, in turn, the extremely high-stress levels one has to consider. Further, friction at the contact areas is another challenge in the understanding and modeling. These challenges have resulted in many simplified numerical models which are far from satisfactory. Consequently, in the investigation reported here simplified analytical and FE models are first dealt with in an attempt to understand the parameters of the models and to provide a foundation for more detailed studies that are based on treating the action of the wheels on the rail as traveling point loads. A more detailed FE model employing three-dimensional (3D) finite elements for the wheel and rail has also been studied and their computed results are compared with those of the simplified models. In the latter models, frictions at the contact areas are considered. In parallel, the effect of block dampers, of various configurations of attachments of the damper blocks to the rail, on the dynamic responses at the contact areas are investigated.
五、主讲人简介
Cho Wing S. To (杜楚荣)，工学博士，美国内布拉斯加大学林肯分校机械与材料工程学院教授。杜博士 毕业于英国南安普敦大学 (University of Southampton)。曾在英国南安普敦大学声与振动研究所 (Institute of Sound and Vibration Research)、加拿大西安大略大学 (University of Western Ontario)、加拿大卡尔加里大学 (University of Calgary) 等就职. 曾是加拿大研究委员会大学研究员 (Canada Natural Sciences and Engineering Research Council, University Research Fellow)。
杜博士是美国机械工程师学会会士 (ASME Fellow)、英国诊断工程师学会创始会士、美国力学学会、美国工业与应用数学学会会员，曾是美国机械工程师学会有限元及计算技术委员会主席、国际力学期刊， 应用与理论力学学报的副主编。工程动力学与振动 eBook Series主编。主要研究领域包括声与振动、固体和计算力学、系统动力学及控制等，特别是非线性、随机及混沌振动，机械结构噪声与振动控制，信号分析及机械噪声诊断，线性及非线性有限元方法及应用等。出版有《Engineering Dynamics》、《Introduction to Kinematics and Dynamics of Machinery》、《Introduction to Dynamics and Control in Mechanical Engineering Systems》、《Stochastic Structural Dynamics: Application of Finite Element Methods》、《Nonlinear Random Vibration: Analytical Techniques and Applications》、《Nonlinear Random Vibration: Computational Methods》等多部著作。
