气流激励下弹性圆柱腔壳振动的实验研究

对风洞中弹性圆柱腔壳的流激振动及声进行了研究。对腔口流体自持振荡和腔内声振荡的压力及壳的振动加速度作了测量和谱分析，并对三者之间的相互影响进行了综合研究。研究结果表明，一般情况下，流体自持振荡对腔壳振动影响不大，但是，当自持振荡与腔内驻声发生耦合并形成共振时，对壳体的振动可产生重要的影响。此外，文中还给出了流激壳体各阶模振动的加速度均方根随流速的变化曲线。均方根值随流速大约是２．４次方线性关系。但

Experiment on Induced Vibration of Opening Cavity with Elastic Cylindrical Wall by Air-Flow

In the present paper,the air-now induced vibration and sound of a cavity with elastic cylindrical wall in wind tunnel are analysed.The shear layer self-sustained oscillation on the opening of the cavity,the sound standing wave oscillation in the cavity and the vibration of the shell(wall of cavity) are induced simultaneously by a f'low.The spectra of pressure and acceleration are analysed.The innuences of self-sustained oscillation and standing wave oscillation on the vibration of the wall are focused on and taken into consideration.It is shown that there edests a strong innuence on the vibration of the shell under and only under the circumstance when the coupling resonance of the self-sustained oscillation and standing wave oscellation occurs.In addition,the spectral density of the mean square value of vibrational acceleration of the shell induced by air now at different modes is given.The RMS values of acceleration are approximate with the speed of now to 2.4-th POwer,and it will be suddenly enhanced when the coupling resonance occurs.