周期约束阻尼设计板结构减振降噪特性分析OA北大核心CSTPCD

In order to explore more efficient damping structure design,combining the artificial periodic structure characteristics with constrained damping vibration and noise reduction technique,the structural vibration and noise characteristics and sound radiation feature of the substrate plates and damping plates with different constraints are analyzed by finite element simulation and experimental tests.The vibration and noise reduction characteristics of the plate structure with the periodically constrained damping design is analyzed.The results show that compared with the traditional constrained damping design,the periodical constrained damping design can more effectively suppress the broadband vibration and acoustic radiation of the substrate plates under the condition of the same additional damping mass.In particular,it has a certain effect on improving low-frequency vibration and noise below 350 Hz,and helps to realize the lightweight of the damping structure.However,the periodic constrained damping design may increase the vibration and noise of the constrained layer and change the acoustic radiation efficiency of the plates.Generally speaking,the periodic design has positive significance for improving the vibration and noise reduction performance of constrained damping structures.