燕尾型叶根松装叶片系统参数对干摩擦减振效应的影响

上官博;刘雅琳;徐自力

振动与冲击 ›› 2012, Vol. 31 ›› Issue (19) : 180-182.

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PDF(1477 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (19) : 180-182.
论文

燕尾型叶根松装叶片系统参数对干摩擦减振效应的影响

  • 上官博1,刘雅琳1,徐自力2
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Effects of System Parameters of Blade with Loosely Assembled Dovetail Attachment on the Dry Friction Damping

  • Shangguan Bo1,Liu Yalin1 ,Xu Zili2
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摘要

采用燕尾型叶根干摩擦模型和叶片简化模型,计算了燕尾型叶根松装叶片系统在不同参数下的振动响应。研究了离心力、摩擦系数、叶根与轮盘接触面接触刚度系数、激振力等参数对叶片系统干摩擦减振效应的影响规律。计算结果表明:在非线性干摩擦力的作用下,叶片系统幅频响应曲线的共振峰值向低频方向偏移,出现了刚度软化现象;在叶片离心力从小到大变化的过程中,系统的共振振幅先减小后增大,存在某个转速下的离心力,系统的共振振幅最小;存在一个最佳摩擦系数值0.3,使系统的共振振幅最小,比最大振幅减小约23%;随着叶根与轮盘接触面间接触刚度系数的增大,叶片系统振幅明显减小,共振频率增大;激振力的大小影响系统共振频率和共振振幅。本研究可为燕尾型叶根松装叶片的设计提供参考。

Abstract

The numerical dovetail attachment dry friction model and lumped-mass-spring model are employed to compute the dynamic response of damping blades. The effect of some control parameters of damping structures on forced response is studied. The results show that the softening spring effect which gives rise to the non-linear response with a resonance peak bending towards lower frequencies. When the centrifugal force is changed from small to large, the amplitude decreases at beginning and then increases. There is centrifugal force value at some rotate speed of blade in which the resonant amplitude is least. There is an optimal value of friction coefficient on which the resonant amplitude is least, and the least amplitude is about 23% smaller than the biggest one. The resonant amplitude of the blade decreases and the resonance frequency increases with the contact stiffness coefficient climbing up. The amplitude of harmonic excitation force also affects the resonant frequency and amplitude of the blade system.

关键词

叶片 / 燕尾型叶根 / 干摩擦 / 振动

Key words

blade / dovetail attachment / dry friction / vibration

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上官博;刘雅琳;徐自力. 燕尾型叶根松装叶片系统参数对干摩擦减振效应的影响[J]. 振动与冲击, 2012, 31(19): 180-182
Shangguan Bo;Liu Yalin;Xu Zili. Effects of System Parameters of Blade with Loosely Assembled Dovetail Attachment on the Dry Friction Damping[J]. Journal of Vibration and Shock, 2012, 31(19): 180-182

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