Journal of Intelligent Material Systems and Structures

 

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First published on March 12, 2008
Journal of Intelligent Material Systems and Structures 2008, doi:10.1177/1045389X07084935

Article

Investigation of the Two-state, Maximum Work Extraction Switching Rule of a State-switched Absorber for Vibration Control

Mark Horner Holdhusen1* and Kenneth A Cunefare2

1 University of Wisconsin, Marathon County, 518 S 7th Ave, Wausau, WI 54401-5396, USA
2 Georgia Institute of Technology George W Woodruff School of Mechanical Engineering Atlanta, GA 30332-0405, USA

* To whom correspondence should be addressed.


  Abstract

A state-switched absorber (SSA) is a derivative of a classical tuned vibration absorber (TVA). An SSA is a mass-spring-damper system that is capable of instantaneously changing its stiffness, thus is capable of instantaneously changing its resonance frequency. Between instantaneous switch events, the absorber is a passive device, acting similarly to a classical TVA. When a switch event occurs, the SSA instantly changes its stiffness, effectively ‘retuning’ its resonance frequency. At this point, the SSA remains tuned to this new frequency until the next switch event, where it changes frequencies again. Previous research has shown that applying a maximum work extraction switching rule to a two-stiffness-state absorber results in improved performance of the SSA over classical vibration absorbers. The article at hand investigates the two-state, maximum work extraction switching rule in more detail. Specifically, the explanation of how the switching rule reduces the vibration of the base to which it is attached is considered. The article also details the stability of such a switching rule.

Key Words: state switching, vibration absorber, vibration damper, vibration control, damping.


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