Broadband control of plate radiation using a piezoelectric, double-amplifier active-skin and structural acoustic sensing

The potential of a piezoelectric, double-amplifier active-skin with structural acoustic sensing (SAS) is demonstrated for the reduction of broadband acoustic radiation from a clamped, aluminum plate. The active-skin is a continuous covering of the vibrating portions of the plate with active, independently controllable piezoelectric, double-amplifier elements and is designed to affect control by altering the continuous structural radiation impedance rather than structural vibration. In simulation, acoustic models are sought for the primary and secondary sources that incorporate finite element methods. Simulation indicates that a total radiated power attenuation in excess of 10 dB may be achieved between 250 and 750 Hz with microphone error sensing, while under SAS the radiated power is reduced by nearly 8 dB in the same frequency range. In experiment, the adaptive feed forward filtered-x LMS (least mean square) algorithm, implemented on a Texas Instruments C40 DSP, was used in conjunction with the 6I6O control system. With microphone error sensing, 11.8-dB attenuation was achieved in the overall radiated power between 175 and 600 Hz, while inclusion of SAS resulted in a 7.3-dB overall power reduction in this frequency band.

[1]  Leonard Meirovitch,et al.  Elements Of Vibration Analysis , 1986 .

[2]  Chris R. Fuller,et al.  Smart foam for applications in passive–active noise radiation control , 1997 .

[3]  Ricardo A. Burdisso,et al.  Low frequency passive noise control of a piston structure with a weak radiating cell , 1999 .

[4]  E. Crawley,et al.  Use of piezoelectric actuators as elements of intelligent structures , 1987 .

[5]  Qing-Ming Wang,et al.  Optimization of bimorph based double amplifier actuator under quasistatic situation , 1996, ISAF '96. Proceedings of the Tenth IEEE International Symposium on Applications of Ferroelectrics.

[6]  C. Fuller,et al.  Piezoelectric Actuators for Distributed Vibration Excitation of Thin Plates , 1991 .

[7]  Julien Maillard,et al.  Advanced time domain wave‐number sensing for structural acoustic systems. I. Theory and design , 1994 .

[8]  Chris R. Fuller,et al.  Advanced time domain wave‐number sensing for structural acoustic systems. Part III. Experiments on active broadband radiation control of a simply supported plate , 1995 .

[9]  Stephen J. Elliott,et al.  A multiple error LMS algorithm and its application to the active control of sound and vibration , 1987, IEEE Trans. Acoust. Speech Signal Process..

[10]  Lawrence E. Kinsler,et al.  Fundamentals of acoustics , 1950 .

[11]  Ricardo A. Burdisso,et al.  Active Control of Broadband Structural Vibration Using the LMS Adaptive Algorithm , 1993 .

[12]  Chris R. Fuller,et al.  Foam-PVDF smart skin for active control of sound , 1996, Smart Structures.