Structural damage detection of a planar truss structure using a constrained eigenstructure assignment

System health monitoring of aerospace vehicles is important not only to conducting safe operation but also to maintaining system performance. Structural health along with sensor and actuator malfunction must be monitored to perform the system health monitoring. As a step toward developing a system health monitoring scheme, this paper investigates structural damage detection using a constrained eigenstructure assignment. The eigenstructure assignment is selected for the investigation since it may be used not only to perform structural damage detection but also to monitor the sensor and actuator performance in a unified manner. To employ the eigenstructure assignment in the framework of structural modeling and modal testing, a concept of constrained eigenstructure assignment is developed. The constrained eigenstructure assignment makes it possible that the computed feedback gains correspond directly to the structural parameter changes. To demonstrate the capability of the approach, a twentybay planar truss structure is employed. Mo&d tests are performed using eleven accelerometers for the undamaged structure and several missing member damage cases. Then the test data are used to locate the missing member. In spite of the incomplete mode shapes and test inaccuracies, accurate damage detection is conducted.

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