Microcontroller-based implementation of adaptive structural control

Donald J. Leo; Steven Fulton Griffin

doi:10.1117/12.316885

27 July 1998 Microcontroller-based implementation of adaptive structural control

Proceedings Volume 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems; (1998) https://doi.org/10.1117/12.316885
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

An adaptive filtering technique is developed for the control of structures with lightly damped modes. The technique is based on a feedback control strategy that uses tuned second- order filters to add damping to structural resonances. A single-mode system is analyzed to determine the effect of the filter parameters on the closed-loop structural damping. The analysis demonstrates that the closed-loop damping is linearly related to the filter damping for gain margins greater than two and that the closed-loop damping is highly sensitive to changes in the filter frequency. The sensitivity of the closed-damping to errors in the filter frequency motivates the use of a phase-lock loop to identify the structural frequency during transient vibration. The feedback compensator is implemented on a digitally- programmable analog filter whose parameters are set by a microcontroller. The adaptive algorithm is demonstrated on a flexible composite beam with a variable tip mass. Adding or subtracting mass to the tip of the beam varies the first structural mode from 24 Hz to 11 Hz. Control experiments demonstrate that the closed-loop damping is reduced from 21% to 4% critical when the filter parameters are not adapted to the structural frequency. In contrast, the adaptive filter is able to maintain between 14% and 21% critical damping in the structural mode as the frequency varies from 24 Hz to 11 Hz.

Citation Download Citation

Donald J. Leo and Steven Fulton Griffin "Microcontroller-based implementation of adaptive structural control", Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); https://doi.org/10.1117/12.316885

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