Sound radiation by a simply supported unbaffled plate

1998 ◽  
Vol 103 (5) ◽  
pp. 2451-2462 ◽  
Author(s):  
B. Laulagnet
Keyword(s):  
Sound Radiation ◽  
Simply Supported

NUMERICAL COMPUTATION OF THE SOUND RADIATION FROM A PLANAR BAFFLED VIBRATING SURFACE

2008 ◽  
Vol 16 (03) ◽  
pp. 321-341 ◽  
Author(s):  
JORGE P. ARENAS
Keyword(s):  
Numerical Evaluation ◽  
Sound Radiation ◽  
Boundary Element Methods ◽  
Lumped Parameter Model ◽  
Surface Velocity ◽  
Simply Supported ◽  
Planar Structures ◽  
Lumped Parameter ◽  
Velocity Information ◽  
Resistance Matrix

The sound power radiated by a plane vibrating structure can be calculated by numerical integration of the Rayleigh integral or by means of finite and boundary element methods. However, these methods are usually time-consuming due to the numerical evaluation of surface integrals. This paper reviews and discusses an alternative numerical method (the lumped parameter model) to compute the sound radiation from planar structures which is based just on surface velocity information and a direct numerical evaluation of the radiation resistance matrix of the structure. As an example, the technique is applied to estimate the sound radiated from the structural axisymmetric modes of both clamped and simply-supported circular baffled plates.

Acoustic Radiated Calculation of a Finite Cylindrical Shell and Interface Design of the Programs

2011 ◽  
Vol 378-379 ◽  
pp. 39-42
Author(s):  
Fei Fei Qiu ◽  
Xiao Wei Liu ◽  
Huan Wen Shi ◽  
Yong Wang
Keyword(s):  
Cylindrical Shell ◽  
Driving Force ◽  
Radiation Power ◽  
Cylindrical Shells ◽  
Sound Radiation ◽  
Sound Field ◽  
Directivity Pattern ◽  
Radiation Impedance ◽  
Simply Supported ◽  
Finite Cylindrical Shell

Based upon the vibratory equation and sound radiation impedance of a cylindrical shell, the sound field distribution of a finite cylindrical shell simply-supported at two infinite rigid cylindrical shells were resolved with considering the structural loss. An interface containing some buttons connected with all the programs was designed by using Matlab, and their data were all stored in a file. It has been shown that the sound radiation power of the cylindrical shell decreases and the radiation efficiency increases with increasing of structural damping loss factors; when the frequency of the driving force is low, the sound field shapes “∞” directivity pattern; When the frequency of the driving force grows higher the sound directivity pattern becomes complex due to superposition of axial modes and circumferential modes; Only when the radiation of the end plates is much weaker than the cylindrical shell the analytical results of the shell simply-supported at two infinite rigid cylindrical shells can be utilized to illustrate the sound radiation by a finite cylindrical shell with two end plates.

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.

scholarly journals Sound radiation of simply supported rectangular plate using finite element method

2019 ◽  
Vol 29 ◽  
pp. 195-200
Author(s):  
Akshaj Kulshreshtha ◽  
Shivam Yadav ◽  
Baij Nath Singh ◽  
Vinayak Ranjan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rectangular Plate ◽  
Sound Radiation ◽  
Simply Supported ◽  
Element Method
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