Control of Sound Radiating from an Orthotropic Plate

1992 ◽  
Vol 114 (4) ◽  
pp. 531-539 ◽  
Author(s):  
L. Meirovitch ◽  
S. Thangjitham
Keyword(s):  
Radiation Pressure ◽  
Orthotropic Plate ◽  
Acoustic Radiation ◽  
Design Parameters ◽  
Far Field ◽  
Simply Supported ◽  
Control Effectiveness ◽  
Field Radiation ◽  
Acoustic Radiation Pressure ◽  
Field Sound

This paper is concerned with the problem of actively suppressing the acoustic radiation pressure generated by an orthotropic plate vibrating in air. The approach is to control the vibration of the modes of the plate most responsible for acoustic radiation pressure. This is accomplished by relating the far-field radiation pressure to the state of the plate. The control of the far-field radiation pressure is carried out by means of actuators placed on the elastic plate. A numerical example demonstrates the application of active control to suppress the far-field sound radiating from a simply-supported rectangular thin orthotropic plate subjected to a harmonic disturbance. The influence on the control effectiveness of various design parameters, such as the number of controlled modes, the choice of controlled modes, and the number of actuators, is investigated.

Active Control of Sound Radiation Pressure

1990 ◽  
Vol 112 (2) ◽  
pp. 237-244 ◽  
Author(s):  
L. Meirovitch ◽  
S. Thangjitham
Keyword(s):  
Active Control ◽  
Radiation Pressure ◽  
Acoustic Radiation ◽  
Excitation Frequency ◽  
Design Parameters ◽  
Simply Supported ◽  
Control Effectiveness ◽  
Field Radiation ◽  
Rectangular Elastic Plate ◽  
Acoustic Radiation Pressure

This paper is concerned with the problem of suppressing the acoustic radiation pressure generated by a structure vibrating in air. The approach is to control the vibration of the modes of the structure most responsible for the radiation pressure. This control is carried out by active means, i. e., by feedback control. As a numerical example, the problem of active control of the far-field radiation pressure generated by the vibration of a simply-supported rectangular elastic plate is considered. The influence on the control effectiveness of various design parameters, such as the number of controlled modes, the choice of controlled modes, the number of actuators and the location of the actuators, is investigated. The conclusion is that, depending on the magnitude of the excitation frequency, satisfactory control can be achieved by using a sufficient number of actuators and by controlling a relatively large number of modes.

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