美国内布拉斯加大学Cho W. S. To教授讲座通知
应金沙检测线路js69和机械结构强度与振动国家重点实验室虞烈教授的邀请,美国内布拉斯加大学Cho W. S. To教授将于2011年10月12日至17日来我校进行学术交流,并为我校师生做讲座。
题目:OPTIMAL CONTROL OF LINEAR AND NONLINEAR NONSTATIONARY RANDOM VIBRATION OF MULTI-DEGREE-OF-FREEDOM SYSTEMS
时间:2011年10月14日(周五)上午9:00~11:00
地点:金沙检测线路js69第3会议室(西2楼2层)
讲座人简介:
NAME:C. W. Solomon To
EDUCATION(degree, area, institution, year)
B.Sc. (Hons.), Mechanical Engineering, University of Southampton, 1973
M.Sc., Mechanical Engineering, University of Calgary, 1975
Ph.D., Sound and Vibration Studies, University of Southampton, 1980
APPOINTMENTS
Professor, University of Nebraska, 1996-present
Professor, University of Western Ontario, 1994-1996
Associate Professor and NSERC University Research Fellow, University of Western Ontario, 1986-1994
Visiting Professor, University of California at Berkeley, 1991-1992
Director, Nonlinear Dynamics Research Laboratory, Vibration Knowledge System Research Laboratory, Sound and Vibration Laboratory, University of Western Ontario, 1990-1996
Associate Professor and NSERC University Research Fellow, University of Calgary, 1985-1986
Assistant Professor and NSERC University Research Fellow, University of Calgary, 1982-1985
Visiting Professor, University of Calgary, 1981-1982
Consulting Engineer, Wolfson Unit for Noise and Vibration Control, University of Southampton, 1979-1980
Research Fellow, Institute of Sound and Vibration Research, 1975-1979
RESEARCH INTERESTS
Sound and Vibration Studies
Nonlinear, random and chaotic vibration, noise and vibration control of structures and machinery, signal analysis and machinery noise diagnostics.
Solid and Computational Mechanics
Nonlinear finite element method with emphasis on isotropic and anisotropic shell finite elements development and their applications, mechanical properties of carbon nanotubes.
System Dynamics and Control
Dynamics of multi-body systems under deterministic and stochastic excitations, stochastic optimal control of structures and systems.
Design
Design Methodology, computer-aided design.
TEACHING INTERESTS
General subjects in systems and design with special interests in vibration studies, machinery noise and vibration diagnostics, finite element analysis, and nonlinear random vibration.
讲座摘要:This lecture consists of two integral parts. The first part is concerned with the extension of the state covariance assignment (SCA) method of Skelton and associates to the optimal random vibration control of large scale complicated shell structures with distributed piezoelectric components and under stationary random excitations. It provides a direct approach for achieving performance goals stated in terms of the root-mean-square (RMS) values which are common in many engineering system designs. The large scale shell structures with distributed piezoelectric components of complicated geometrical configurations are approximated by the mixed or hybrid strain formulation based lower order triangular shell finite elements developed previously by the author and his associates. Each of these shell finite elements has three nodes. Every node has seven degrees of freedom (dof) which include three translational, three rotational and one electric potential dof. Computed results applying the proposed approach for a plate and a cylindrical shell structures with distributed piezoelectric components and under stationary random excitations are included to demonstrate its simplicity of use and efficiency of implementing the proposed approach.
The second part of this lecture deals with the generalization of the approach in the first part to multi-degree-of-freedom nonlinear systems under nonstationary random excitations. The Lyapunov equations for such systems and their solutions are considered. Computed results are included to show its simplicity and usefulness.
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金沙检测线路js69 2011-10-11