Integration of autonomous fatigue crack detection and vibration control in smart plates

Laura R. Ray; Bong-Hwan Koh

doi:10.1117/12.388859

22 June 2000 Integration of autonomous fatigue crack detection and vibration control in smart plates

Laura R. Ray, Bong-Hwan Koh

Proceedings Volume 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems; (2000) https://doi.org/10.1117/12.388859
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

This paper develops and demonstrates performance analysis of vibration suppression and damage detection control laws on structures with fatigue cracks. State feedback control laws for the individual tasks of vibration suppression and autonomous damage detection are designed based on low-order models of a damaged structure. These control laws are applied to finite-element models of structures with through-surface and surface cracks. The analysis ascertains the ability of feedback control to enhance sensitivity of modal frequency shifts due to realistic damage and the potential for using the same sensors and actuators for implementing vibration damping control laws that are insensitive to damage. In the control model, damage consists of simple reductions in thickness over a small area of the structure. Finite-element models to which control laws are applied are developed using commercial software (ABAQUS) that more accurately models the crack by releasing element connections or by using line spring elements. Results show that feedback control laws can be designed for either crack detection or vibration suppression using identical hardware. In addition, we demonstrate that simple models of damaged structures are suitable for designing control laws for detecting more complex damage conditions, and we demonstrate the use of commercial software for model-based simulation of controlled structures.

Citation Download Citation

Laura R. Ray and Bong-Hwan Koh "Integration of autonomous fatigue crack detection and vibration control in smart plates", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); https://doi.org/10.1117/12.388859

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