Abstract
This paper firstly used the finite element method to study the impact of air coupling on the structural radiation noise of thin plates and conducted a comparative analysis on the vibration noise of thin plates in the water and air. Results showed that coupling effect and medium property had an obvious influence on the radiation noise of thin plates, and these factors must be considered. Secondly, this paper proposed laminated plates based on the single-layered thin plate. The related experiment of laminated plates was conducted and compared with the computational result to verify its reliability. As an important parameter of laminated plates, laying angle can change the structural stiffness of laminated plates and mechanical properties. Therefore, based on the verified computation model, this paper studied the radiation noise of laminated plates through changing the laying angle of laminated plates, improved the vibration noise of laminated plates through applying control forces. As a result, a laminated plate with the optimal performance can be obtained. Finally, laminated composite plates were applied to the inner surface of panels which had made greater acoustic contributions to high-speed trains and controlled the vibration noise of high-speed trains through applying control forces. Results showed that the peak noise of high-speed trains was obviously improved at multiple frequencies and total sound power levels reduced by 23.1 dB.
Highlights
As a kind of new-type materials with high stiffness and strength, laminated composite plates have been widely used in industrial fields including aerospace, nuke industry and automobiles at present
Results showed that coupling effect and medium property had an obvious influence on the radiation noise of thin plates, and these factors must be considered
The mode of thin plates coupled with air kept consistency with that coupled with water, but an obviously, difference was shown around the thin plate
Summary
As a kind of new-type materials with high stiffness and strength, laminated composite plates have been widely used in industrial fields including aerospace, nuke industry and automobiles at present. This paper firstly used finite element method to study the impact of air coupling on the structural radiation noise of thin plates and conducted a comparative analysis on the vibration noise of thin plates in media including water and air. It could be seen from the comparison among modes of other several orders that modes of air coupling were consistency with those of water coupling near the center of thin plates and an obvious difference was shown around thin plates It was because the resistance of water was larger and its coupling effect was less obvious than that of air. The radiation sound power of thin plates in the water would be higher than that in the air at non-resonant frequencies
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