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

1997 ◽  
Author(s):  
Donald J. Leo ◽  
Jeffrey S. Paine
Keyword(s):  
Active Control ◽  
Sound Radiation ◽  
Point Force

Active Control of Structural Sound Radiation in an Acoustic Enclosure Using Distributed Point Force Actuators

2014 ◽  
Vol 1082 ◽  
pp. 517-520
Author(s):  
Da Lin Chen ◽  
Nan Chen
Keyword(s):  
Active Control ◽  
Sound Pressure Level ◽  
Cooperative Control ◽  
Sound Pressure ◽  
Control Method ◽  
Sound Radiation ◽  
Sound Field ◽  
Pressure Level ◽  
Point Force ◽  
Flexible Plates

This paper demonstrates an investigation about the active control of sound radiation in the enclosure cavity consists of two flexible plates. One of the flexible plates is driven by a point force to generate the primary sound field in the cavity, and using some point forces which are located at different locations on the receiving plate to suppressing the panel vibration and then to minimum the cavity sound pressure level (SPL); meanwhile some actuators are located on the other panel surfaces to reduce the sound pressure level at some frequencies that can’t be well reduced by only effect on one panel. The better result shows the possibility of applying distributed cooperative control method to the structural-acoustic coupled system.

Active Control of Sound Radiation Into an Enclosure Using Different Number of Actuators

2013 ◽  
Vol 313-314 ◽  
pp. 1299-1303
Author(s):  
Huai Feng Cui ◽  
Nan Chen
Keyword(s):  
Potential Energy ◽  
Active Control ◽  
Noise Level ◽  
Sound Radiation ◽  
Coupled System ◽  
Point Force ◽  
Contour Plot ◽  
Control Mechanisms ◽  
Simply Supported ◽  
Flexible Plates

This paper presents an investigation into the active control of structural-acoustic coupled system of a rectangular enclosure involving two simply supported flexible plates. One of the two plates is driven by a point force. The locations of actuators are determined by considering contour plot of the optimal potential energy. The control mechanisms for this enclosure are analyzed when one, two and three actuators are applied on one of the plates. Results obtained demonstrate that the control mechanisms for Panelaare always modal restructuring; those for Panelbare dominantly modal suppression when a different number of actuators is applied to reduce the noise level.

Sound radiation from a double-leaf elastic plate with a point force excitation: effect of an interior panel on the structure-borne sound radiation

2002 ◽  
Vol 63 (7) ◽  
pp. 737-757 ◽  
Author(s):  
Motoki Yairi ◽  
Kimihiro Sakagami ◽  
Eiji Sakagami ◽  
Masayuki Morimoto ◽  
Atsuo Minemura ◽  
...  
Keyword(s):  
Elastic Plate ◽  
Sound Radiation ◽  
Point Force ◽  
Force Excitation

Sound radiation from a point force in circular motion

1971 ◽  
Vol 15 (3) ◽  
pp. 325-351 ◽  
Author(s):  
C.L. Morfey ◽  
H.K. Tanna
Keyword(s):  
Sound Radiation ◽  
Circular Motion ◽  
Point Force

A general analysis of the active control of sound radiation from a baffled panel

1989 ◽  
Vol 86 (S1) ◽  
pp. S32-S32 ◽  
Author(s):  
Scott D. Snyder ◽  
Pan Jie ◽  
Colin H. Hansen
Keyword(s):  
Active Control ◽  
Sound Radiation ◽  
General Analysis

Active Control of Low-Frequency Sound Radiation From Vibrating Panel Using Planar Sound Sources

2001 ◽  
Vol 124 (1) ◽  
pp. 2-9 ◽  
Author(s):  
Kean Chen ◽  
Gary H. Koopmann
Keyword(s):  
Active Control ◽  
Near Field ◽  
Low Frequency ◽  
Sound Radiation ◽  
Sound Field ◽  
Sound Power ◽  
Frequency Range ◽  
Sound Sources ◽  
Frequency Sound ◽  
Secondary Sources

Active control of low frequency sound radiation using planar secondary sources is theoretically investigated in this paper. The primary sound field originates from a vibrating panel and the planar sources are modeled as simply supported rectangular panels in an infinite baffle. The sound power of the primary and secondary panels are calculated using a near field approach, and then a series of formulas are derived to obtain the optimum reduction in sound power based on minimization of the total radiate sound power. Finally, active reduction for a number of secondary panel arrangements is examined and it is concluded that when the modal distribution of the secondary panel does not coincide with that of the primary panel, one secondary panel is sufficient. Otherwise four secondary panels can guarantee considerable reduction in sound power over entire frequency range of interest.

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