针对带阻尼叶片系统复杂多变的接触运动状态，建立考虑时变正压力的阻尼动力学评估方法，开展干摩擦阻尼动力学特性研究。基于微滑移理论构建多接触点三维摩擦模型，采用剩余柔度界面模态综合法对有限元模型进行缩减以重组非线性动力系统方程，借助时频交互法及弧长延拓技术对叶片的幅频振动响应进行迭代求解，据此分析了当正压力变化以及异相位运动时接触面上的力学行为表现，评估了多个设计参数对叶片动力学特性的影响规律并总结多参数优化设计方法。结果表明，所建立的理论模型具有准确性，采用该方法计算获得的接触面力学特性更加准确；法向正压力和运动相位的改变会直接影响阻尼接触运动形式，考虑正压力的时变性对准确预估阻尼减振效果具有重要意义；提出了等效质量的设计概念，能够进行多参数同步优化计算分析以提升计算效率，并应用该方法获取了某型缘板阻尼器优化后的减振效率提升了20.38%。

Aiming at the complex and variable contact motion state of the damped blade system, the damping dynamics evaluation method considering time variation of normal pressure is established, and the research on the dry friction damping dynamic characteristics is studied. A three-dimensional friction model with multiple contact points is constructed based on micro-slip theory, the finite element model is reduced by the residual flexibility interface modal synthesis method to reform the nonlinear dynamic system equation, and the amplitude-frequency vibration response of the blade is iteratively solved by the time-frequency interaction method and the arc length extension technique, the mechanical behavior on the contact surface is analyzed and evaluated about changing normal pressure and out of phase motion based on this, the influence laws of multiple design parameters on blade dynamic characteristics are evaluated, the multi-parameter optimization design method is summarized. The results show that the theoretical model established is accurate, the mechanical characteristics of the contact surface obtained by this method is more accurate; The change of normal pressure and phase motion will directly affect the damping contact motion form, considering the time-varying nature of normal pressure is of great significance for accurately predicting the damping vibration reduction effect; The concept of equivalent mass is proposed, which can perform synchronous optimization calculation analysis of multiple parameters to improve the calculation efficiency, and the application of this methodology resulted in a 20.38 percent enhancement in the vibration damping efficiency of a specific underplatform damper after optimization.

TK221