SOUND REFLECTION AND TRANSMISSION OF COMPLIANT PLATE-LIKE STRUCTURES BY A PLANE SOUND WAVE EXCITATION
✍ Scribed by G.R. LIU; C. CAI; K.Y. LAM
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 273 KB
- Volume
- 230
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
The sound transmission and re#ection by an in"nite compliant plate-like structure immersed in #uids are analyzed using an exact method. A matrix formulation for the submerged plate with a stack of arbitrary number of anisotropic or isotropic layers, and subject to a plane sound wave excitation, is derived to obtain the transmission and re#ection coe$cients in the frequency domain. The coupling between the #uid and plate is taken into account in a rigorous manner. Several application examples are used to evaluate the e!ects of the thickness of the coating layer and base plate, the mutual position of layers, and the damping loss factors on the sound transmission and re#ection. Results show that the coating layer attached to a steel base plate can e!ectively decrease the sound re#ection by an average amount of about 6 dB above a frequency of 10 kHz when the coating layer of thickness 100 mm is on the incidence side. 2000 Academic Press * *z , (6) where L V and L X can be obtained by inspection. By using this de"nition of L, the operator product L2cL in equation (2) becomes L2cL"D VV * *x #2D VX * *z*x #D XX * *z , (7) in which D VV "