周期自由阻尼设计板结构振动与声辐射特性分析

Vibration and Acoustic Radiation Characteristics Analysis of Plate with Periodic Free Damping Design

为了探究更高效的阻尼减振降噪结构设计,基于阻尼减振降噪技术和人工周期结构原理,开展了周期自由阻尼设计的板结构振动与声辐射特性研究。首先,建立了板结构声振响应有限元仿真模型;其次,对比了周期自由阻尼设计与传统自由阻尼设计的板结构振动与声辐射特性差异,并分析了不同参数变化对周期自由阻尼作用效果的影响;最后,开展了相关实验研究与仿真规律验证。结果表明:相比于传统自由阻尼设计,周期自由阻尼设计可以获得更好的减振降噪效果,且有助于实现阻尼结构的轻量化设计,但也会改变结构的声辐射效率;选用高弹性模量的阻尼材料、合理设计阻尼单元形状和适当减小阻尼单元截面积都有助于提高周期自由阻尼设计的性能,而阻尼单元粘贴角度的变化对其作用效果的影响较小;实验结果验证了仿真规律的可靠性。

In order to explore more efficient damping structure design,based on the theory of damping vibration and noise reduction technology and artificial cycle structure,the vibration and acoustic radiation characteristics of plate structures with periodic free damping design were studied.Firstly,the finite element simulation model of the acoustic and vibration response of plate structures were established.Secondly,the vibration and acoustic radiation characteristics of the plates with periodic free damping and traditional free damping were compared,and the influence of different parameters on the effect of periodic free damping were analyzed.Finally,relevant experimental research and simulation results verification were carried out.The results show that compared with traditional free damping design,the periodic free damping design can obtain better vibration and noise reduction effect,and help to realize the lightweight design of the damping structure,but the acoustic radiation efficiency will also be changed.The selection of damping materials with high elastic modulus,reasonable design of damping unit shape and appropriate reduction of damping units sectional area can help to improve the performance of periodic free damping design,while the change of the paste angle of the damping unit has little impact on its effect.In addition,the experimental results verify the reliability of the results from simulation study.