带干摩擦接触的叶根模态阻尼分析方法

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (19) : 163-167.

论文

带干摩擦接触的叶根模态阻尼分析方法

陈俊杰1，臧朝平1，周标1，PETROV E2

作者信息 +

Modal damping analysis method for blade root with dry friction contact

CHEN Junjie1, ZANG Chaoping1, ZHOU Biao1, PETROV E2

Author information +

文章历史 +

摘要

发展了一种叶根模态阻尼分析方法，针对叶根干摩擦问题，采用带接触的叶根高保真模型，基于能量耗散原理来进行模态阻尼的计算，此方法主要分为三部分：1，在ANSYS有限元软件中采用可描述面与面间摩擦接触交互作用的接触单元，建立带干摩擦接触的叶根高保真模型；2，对其进行模态分析，并在瞬态分析模块中对局部叶根模型进行简谐作用下的强迫振动模拟及求解；3，根据叶根接触面微滑移下干摩擦产生的耗散能，计算获取模态损耗因子。该方法可以对不同振型下带叶根干摩擦阻尼叶片的模态损耗因子进行预测分析。通过带接触面的真实叶根模型对该方法进行了验证，并分析了不同振型下振幅、转速、摩擦系数以及法向和切向接触刚度对模态损耗因子的影响。

Abstract

A method was developed to analyze modal damping factors of a blade with root dry friction contact. Aiming at the dry friction problem at blade root, the blade root high fidelity model with contact was used to calculate modal damping based on the energy-dissipating principle. It was shown that the developed method consists of 3 parts including in the finite element software ANSYS, adopting the contact element describing surface-to-surface friction contact interaction to establish the blade root high fidelity model with dry friction contact; performing the modal analysis for the built blade root model and simulating forced vibration of the local blade root model under simple harmonic excitation in transient analysis module; calculating modal damping factor according to dissipation energy generated by micro-slip dry friction on blade root contact surface. The developed method could be used to predict modal damping factors of blades with root dry friction damping under different modal shapes. The actual blade model with contact surface was used to verify the developed method, and effects of amplitude, rotating speed, friction coefficient, normal and tangential contact stiffnesses on modal damping factors under different modal shapes were analyzed.

导出引用

陈俊杰1，臧朝平1，周标1，PETROV E2. 带干摩擦接触的叶根模态阻尼分析方法[J]. 振动与冲击, 2020, 39(19): 163-167

CHEN Junjie1, ZANG Chaoping1, ZHOU Biao1, PETROV E2. Modal damping analysis method for blade root with dry friction contact[J]. Journal of Vibration and Shock, 2020, 39(19): 163-167

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