振动波分离引起的能量耗散性能分析  

Analysis of vibration energy dissipation through wave separation

作　　者：徐文健 王栋[1] XU Wen-jian;WANG Dong(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;No.8511 Research Institute of CASIC,Nanjing 210007,China)

机构地区：[1]西北工业大学航空学院,陕西西安710072 [2]中国航天科工集团八五一一研究所,江苏南京210007

出　　处：《振动工程学报》2023年第5期1292-1299,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51975470)。

摘　　要：通过在结构上附加阻尼弹簧支撑,利用非经典阻尼引起的模态复化效应使系统产生振动局部化现象,研究了简支梁结构在简谐位移激励作用下振动响应的抑制问题。采用波传播法描述结构的位移响应,利用阻尼弹簧支撑限制行进波分量向梁左侧区域的传播,从而实现了行波和驻波的空间分离和振动能量的定向传递。采用振动功率流方法分析了结构中的波形转换、能量储存和流动,确定了振动能量的流动方向。详细研究了阻尼弹簧支撑设计对梁结构振动能量的耗散作用,揭示了行波与驻波分离发生时刻振动能量的传递规律。通过典型算例,充分展示了利用阻尼弹簧支撑抑制结构振动响应的效果。探讨了激励频率、支撑刚度、位置和阻尼系数等参数对振动能量耗散性能的影响,比较了不同设计方案的抑振效果和能量耗散状况。The suppression of the dynamic response of a beam structure is studied under a single harmonic displacement excitation.By attaching a damping spring support to the structure and using the modal complex effect caused by non-classical damping,the system vibration is effectively localized.The structural displacement response is described by using the Wave Propagation Ap-proach,and the traveling wave’s propagation is constrained only in the left region of the viscoelastic support.Then,the spatial sep-aration of the traveling and standing waves appears within the beam,and the directional propagation of the vibration energy is even-tually achieved.The waveform conversion,energy storage and flow in the structure are analyzed by the vibration power flow meth-od,and the flow direction of the vibration energy is determined,which may help reveal the mechanism of the vibration energy transformation.The dissipation effect of the damping spring support on the vibration energy of the beam structure is analyzed in de-tail,and the transmission law of the vibration energy upon the wave separation is discussed.Through a typical example,the effect to suppress structural vibration response is fully demonstrated by using a damping spring support,and the vibration suppression and energy dissipation of the different design schemes are compared.

关 键 词：能量耗散 振动响应局部化 振动功率流 行波与驻波分离 阻尼弹簧支撑 

分 类 号：O328[理学—一般力学与力学基础]