带干摩擦阻尼结构叶片振动响应试验

建立了非旋转状态叶片试验系统,正压力加载方案可实现连续调节并较准确测量接触压力.利用该试验系统,对不同接触紧度,接触角度带冠叶片的振动特性及响应进行测试,结果表明带冠叶片出现了共振频率分叉的非线性现象.通过试验分析叶冠接触面紧度,接触角度等重要参数对带冠叶片振动特性和减振效果的影响规律,结果显示接触角度应根据振型综合考虑接触面间相对运动在切向和法向两个方向分量的比例关系进行选取.

Experiment of vibration and response of blade with dry friction structure

A testing system was set up to measure dynamic response of non-rotating shrouded blades.The loading scheme can achieve continuous adjustment and accurate measurement of contact pressure.The vibration characteristics and response of the shrouded blade with different mounting tightness and pressure angles were measured.The results show that the shrouded blade has nonlinear phenomena-the resonance frequencies are forficate.The effect of mounting tightness and pressure angle were analyzed according to the test data.The results indicate that the selection of pressure angle should be considered according to the proportional relations between relative motion to normal direction and tangential direction based on vibration mode.