基于整体-局部统一滑动模型的叶片缘板阻尼器减振特性分析  

A Method for Reducing the Blade Vibration of Platform Damper Using the Macro-Micro Slip Model

作　　者：何尚文[1] 任兴民[1] 秦卫阳[1] 邓旺群[2] 

机构地区：[1]西北工业大学力学与土木建筑学院,陕西西安710072 [2]中国航空动力机械研究所,湖南株洲412002

出　　处：《西北工业大学学报》2010年第6期872-876,共5页Journal of Northwestern Polytechnical University

基　　金：航空科学基金(20092108003)资助

摘　　要：文章通过在干摩擦接触面间引入弹性塑料剪切层来模拟摩擦接触,建立了整体-局部统一滑动摩擦模型。根据一次谐波平衡和等效线性化法计算等效刚度和等效阻尼2个干摩擦因子,用弹簧阻尼单元(包含2个干摩擦因子)模拟干摩擦力,建立了更为贴近工程实际的B-B型缘板阻尼叶片有限元模型。最后用谐响应分析及迭代的方法对系统进了求解,得到了缘板阻尼器设计中关键参数对叶片减振效果的影响规律。文中结论为工程中缘板干摩擦阻尼器设计提供了重要参考。By incorporating elastoplastic shear layer to characterize the dry friction contact,we present a macro-micro slip model for dry friction.Based on its first harmonics and equivalent linearization,the equivalent stiffness and damping which are defined as dry friction factors are studied.In addition,the spring-damper element containing two dry friction factors is introduced to model the dry friction force,and a finite element model for blade-blade（B-B） platform damper is set up.By using harmonic response analysis and iteration,the dynamical system is simulated.Influences of the key parameters in platform-damper design on reducing the blade vibration such as friction coefficient,normal force and external excitation are studied.Results indicate that after macro slip the equivalent stiffness and damping will decrease as the blade steady amplitude increases and that there is a range of normal load during which reduction effect of the blade＇s steady response under working frequency is satisfactory.

关 键 词：整体-局部统一滑动摩擦模型 缘板B-B型干摩擦阻尼器 有限元分析 减振特性 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]