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California State University, Long Beach

Mechanical & Aerospace Engineering (MAE)

MAE News

April 21, 2005

Tenure-Track Candidate Seminars 2005

Dr. David Ma, April 26th

Modeling, Control, and Monitoring of Complex Structures

The response of structures to external disturbances has long been a primary interest for engineers. Recent efforts to improve the reliability and operational efficiency of structures have employed modeling, control, and monitoring techniques. Significant advances using these techniques are evident in many mechanical and aerospace applications.

In the first part of this talk, a modeling technique is presented, in which simplified models of a complex structure are obtained using only input and output data from actual measurements of structural motion. Compared to other comparable models, these simplified models retain the advantage of simplicity, which is desirable for control purposes, but with much greater accuracy.

The second subject of this talk addresses the development of a new adaptive control method. Here, the control design process accounts for the external disturbances through a feed forward term. An adaptive scheme is developed to update this feed forward gain to guarantee improved control efficiency.

A time domain method for structural health monitoring comprises the third topic of this talk. In this method, the coupling effects of the failure modes are removed by projecting the measurements onto some subspaces. In this way, the presence of damage and the corresponding location are simultaneously determined. Finally, the alternative use of this technique in real time applications is illustrated.

The presentation will conclude by highlighting ongoing and future research projects.

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