In recent years, there has been a growing interest in growing active of acoustic radiation of vibrating structures such as an aircraft fuselage. The structural control approach has been proven to be an effective solution for this problem. There are still some research issues that deserve further studies. One is related to sensing. The issue is how to develop practical acoustic sensor configurations that lead to global noise reduction in the enclosure. The other issue is related to the safety concern of structural controls. One potential problem with the structural control is that it may cause fatigue damage to structures. This issue is particularly sensitive to the aerospace industry. In this paper, a comparative study of the strain fields induced by several popular structural control actuators including distributed piezoelectric actuators is presented, and a measure of safety of structural control actuators developed. The measure is defined as a strain index. According to the simulation results, the strain index for the distributed modal piezoelectric actuators is much smaller than that for the other actuators over a range of frequencies. This indicates that the distributed modal piezoelectric actuators induce more uniform strains than the discrete actuators as well as the actuators with spatial discontinuity such as rectangular patch. The results of the paper suggest that the distributed actuators with a smooth contour are safer than others.
A safety measure of structural control actuators
Herleitung eines Sicherheitskriteriums für Strukturdämpfungsaktoren
Journal of Sound and Vibration ; 206 , 1 ; 122-125
1997
4 Seiten, 3 Tabellen, 8 Quellen
Article (Journal)
English
A safety measure of structural control actuators (sv971088)
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