复合材料面板对筒型基座整体抑振机制影响规律研究

Damping mechanism of sandwich panel on cylindrical foundation

提出一种新型复合材料筒型基座结构形式,其面板采用夹芯结构设计;通过系统阻抗特性分析理论预测面板结构及材料参数对基座减振性能的影响规律;针对夹芯面板开展静/动力学特性试验;以振级落差为减振效果评价指标,通过激振试验研究面板结构参数对基座抑振机制的影响规律。研究结果表明:在频段ω<400 Hz,夹芯面板刚度能有效控制基座减振性能,随着频率的增加,面板刚度抑振机制减弱,阻尼高频损耗抑振机制增强;夹芯面板芯材厚度的增加对基座高频抑振性能优于表层厚度增加;面板对基座减振耗能贡献高于环壁间阻尼芯材。

A composite material foundation structure was presented,with the panel designed as sandwich structure.The effects of structure and material parameters of the panel on the foundation vibration were predicted theoretically through system impedance analysis.The static/dynamic characteristics of the sandwich panel were analysed.Using vibration level difference as evaluation index,the panel structure parameters affecting the foundation damping performance were studied by experiments.The results show that： at frequency ω400 Hz,the sandwich panel stiffness can effectively control the vibrtion reduction performance of the foundation.As the frequency increases,the effect of panel stiffness is reduced,while the high-frequency loss due to damping is enhanced.High-frequency damping properties of the foundation will be more strengthened by increasing the thickness of the panel core material rather than by increasing the thickness of surfaces.The damping capacity of the whole foundation contributed by faceplate is higher than that by damping material in canister wall.