13th International Conference on Fracture June 16–21, 2013, Beijing, China -9- a. Velocity b. Sound Pressure Level Figure 6. Dynamic responses From Fig. 6, It is found that the number of the evident peaks is associated with the incident angle of the acoustic excitation. Because the excitation can’t influence the natural frequency, the frequencies of peaks on each curve correspond to the natural frequencies of the sandwich plate under the temperature rise of 50°. The first-order natural mode is markedly excited by all these three sound wave. The three curves are overlapping in the low frequency. 5. Conclusion In this paper, a method to analyze the dynamic response and sound radiation of the sandwich plate under thermal environment is presented. The influences caused by thermal environment and acoustic excitation on the sandwich plate are discussed in this paper. Sandwich plates subjected to different thermal loads present different natural property. The natural frequencies decrease and the modes remain the same when the thermal load rises. Thermal environment influences fundamental frequency remarkably, while the effect is less obvious in high natural frequency domain. On the other hand, the dynamic responses are also changed by the thermal load. As the thermal load increases, the peaks of response float to low-frequency range. The plate imposed on the plane sound wave with different incident angle is analyzed. The acoustic excitation can’t affect the natural characteristics of the plate, but the dynamic response is highly associated with the incident angle of the plane wave. Plane waves with different incident angles can excite different number of the evident peaks on the response curve, but the corresponding frequency of each peak can’t be affected. Acknowledgements The authors are grateful to the National Natural Science Foundation of China (Grant No. 91016008, 11021202). References [1] P. Jeyaraj, N. Ganesan, C. Padmanabhan, Vibration and acoustic response of a composite plate with inherent material damping in a thermal environment. Journal of Sound and Vibration, 320 (2009) 322-338. [2] B. R. Kumar, N. Ganesan, R. Sethuraman, Vibro-acoustic analysis of composite circular disc
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