缘板阻尼结构减振特性的影响因素分析

基于简化的叶片-缘板阻尼结构模型，开展缘板阻尼结构干摩擦阻尼减振特性的计算分析。阐述了谐波平衡法预测叶片响应的基本原理，并提出了一种基于离散傅里叶变换的雅克比矩阵快速计算方法，结果表明:该方法能够实现谐波平衡法的加速，并使叶片响应计算效率提高8倍以上。在此基础上，重点探究了离心力、缘板阻尼块质量、激振力、缘板倾斜角及缘板阻尼块转动等因素对叶片响应特性的影响，并总结上述关键设计参数对叶片-缘板阻尼结构减振特性的影响规律。 

Analysis of effect factors on damping characteristics for underplatform dampers

Damping performance of the underplatform damper was numerically investigated on the basis of a simplified model of blades with an underplatform damper. The harmonic balance method was employed to predict the blade response in the frequency domain. A simple expression of the Jacobian matrix by means of discrete Fourier transform was proposed, allowing acceleration of the harmonic balance method. Result showed that, the computational efficiency was improved more than 8 times in terms of blade response prediction. The impacts of key parameters, including centrifugal force, damper mass, excitation level, underplatform angle and the rolling motion of the damper, were thoroughly investigated.