Comparison of point force and distributed actuators for the active control of structural sound radiation

Donald J. Leo; Jeffrey S.N. Paine

doi:10.1117/12.275706

6 June 1997 Comparison of point force and distributed actuators for the active control of structural sound radiation

Donald J. Leo, Jeffrey S.N. Paine

Proceedings Volume 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems; (1997) https://doi.org/10.1117/12.275706
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

Point force actuators and distributed moment actuators are compared in terms of their ability to radiate sound power from a baffled plate. The nondimensional expressions for the maximum sound power radiated from a simply-supported baffled plate are derived. The maximum radiated sound power, normalized with respect to the sound power radiated by a rigid piston, is shown to be a function of a nondimensional wave number, the side length ratio of the plate, and the maximum eigenvalue of the acoustic power matrix. The expression for the maximum radiated sound power is used to compare the efficiency of point force actuators and distributed moment actuators. The efficiency is defined as the actual sound power radiated by the plate over the maximum possible sound power. Power efficiency is plotted for the two types of actuators located in different positions on the plate. The results demonstrate that the efficiency is strongly dependent on frequency and location for both point force actuators and distributed actuators. Also, the nondimensional analysis illustrates that the maximum and minimum power efficiency of individual actuators does not necessarily correlate with the vibration modes of the plate.

Citation Download Citation

Donald J. Leo and Jeffrey S.N. Paine "Comparison of point force and distributed actuators for the active control of structural sound radiation", Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); https://doi.org/10.1117/12.275706

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