The performance of vibro-acoustic coupling of the sandwich structure with absorptive material in external convected fluids
NING Shaowu1, SHI Zhiyu1, LI Xiaosong2
1.State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. China Academy of Launch Vehicle Technology, Beijing 100076, China
An equivalent fluid model is employed to characterize the absorption of sound in the sound absorptive material. A vibro-acoustic coupling model is developed for the sound insulation of an sandwich structure which filled with sound absorptive material in convected fluids. The performance of sound Transmission is obtained by employing the wave method. The effects factors of vibro-acoustic responses which were researched include incident angles and azimuch angles, the velocity and direction of convected flow and the geometrical dimensions of the double panels. Studies have shown that the insulation of an structure with absorption than air is improved; the larger the thickness of the up and low panel and the gap are, the larger the sound transmission loss is; the larger the the incident elevation angles and azimuch angles are, the smaller the sound transmission loss is; in calculating the frequency band(0~5000Hz), Sound transmission loss decreases with the increase of Mach number when the sound is incident in the upstream but increases with the increase of Mach number when the sound is incident in the downstream.
宁少武1，史治宇1，李晓松2. 流场中填充吸声材料夹层板结构的声振耦合特性[J]. 振动与冲击, 2016, 35(3): 107-113.
NING Shaowu1, SHI Zhiyu1, LI Xiaosong2. The performance of vibro-acoustic coupling of the sandwich structure with absorptive material in external convected fluids. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(3): 107-113.
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