叶片缘板阻尼结构阻尼效果分析

摘要

By using harmonic balance method, the damping effect of a turbine blade platform damping structure was analyzed by theoretical analysis and finite element numerical simulation respectively, and compared with the test results. It showed that the two results are in good agreement. It is found that the blade frequency increases nonlinearly with the increase of the centrifugal force of the damping block. But the blade vibration pattern is basically unchanged. The maximum vibration stress of the blade appears at the inlet end of the extension root. The damping block has a significant damping effect. And the damping effect of the damping block is more obvious under the excitation of high quantity value.%基于谐波平衡法,分别通过理论分析和有限元数值仿真分析对某涡轮叶片缘板阻尼结构进行了阻尼效果分析,并与试验结果进行了对比,两者吻合性较好.研究发现叶片频率随着阻尼块离心力的增大呈非线性增大,但叶片振型基本不变;叶片最大振动应力出现在伸根处进气端;阻尼块起到了明显的阻尼效果,且在高量值激励下,阻尼块起到的阻尼效果更加明显.