Journal of Intelligent Material Systems and Structures

 

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This version was published on February 1, 2008
Journal of Intelligent Material Systems and Structures, Vol. 19, No. 2, 171-179 (2008)
DOI: 10.1177/1045389X06074026

Experimental Evaluation of the Smart Spring Impedance Control Approach for Adaptive Vibration Suppression

Viresh Wickramasinghe

Institute for Aerospace Research, National Research Council Canada, Ottawa, Ontario, Canada, K1A 0R6, viresh.wickramasinghe{at}nrc.gc.ca

Yong Chen

Institute for Aerospace Research, National Research Council Canada, Ottawa, Ontario, Canada, K1A 0R6

David Zimcik

Institute for Aerospace Research, National Research Council Canada, Ottawa, Ontario, Canada, K1A 0R6

Most active vibration suppression approaches have attempted to suppress structural vibration by incorporating active material actuators, such as piezoceramic, within the structure to act directly against vibratory loads. These approaches require the piezoceramic actuators to generate significant force to effectively counteract the vibratory forces. Unfortunately, successful implementation of these approaches has been hindered by the limited displacement capabilities of piezoceramic actuators. The Smart Spring concept is a unique approach to actively control combinations of dynamic impedance characteristics of a structure, such as the stiffness and damping, to suppress vibration in an indirect manner. The piezoceramic actuators employed in the Smart Spring concept are not used to directly counteract excitation loads but rather adaptively vary the effective impedance properties of the structure. This study demonstrates the ability of the Smart Spring concept to control dynamic impedance characteristics of a structure through experimental investigations. Mechanical shaker tests using the proof-of-concept hardware verify the controllability of the impedance properties using the Smart Spring device and its ability to suppress vibration. More importantly, the tests conducted in a wind tunnel demonstrate the performance of the Smart Spring under highly varying unsteady excitation conditions. These experimental investigations confirm the capability of the concept that can easily be implemented as an adaptive mount system to suppress undesired vibration generated by mechanical systems.

Key Words: smart spring • semi-active • impedance control • adaptive vibration suppression.


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