摘要
基于单边微滑移解析模型,建立了阻尼器干摩擦力的本构关系,该模型可以较好地描述摩擦界面粘滞-滑移状态以及在同一时刻阻尼器各局部拉、压应变不同而产生的摩擦力方向的不同。采用等效刚度和等效阻尼对干摩擦力的非线性特征进行了线性化处理。引入干摩擦阻尼因子度量干摩擦阻尼效果。采用谐波平衡法对简化的带阻尼器叶片系统进行了强迫振动响应分析。分析表明:干摩擦阻尼器对叶片的作用体现在阻尼和刚度两个方面,干摩擦阻尼因子是评价干摩擦阻尼效果的一个较好的参数;存在最佳的正压力,使干摩擦阻尼因子最大,响应最小。
Friction force of dry friction damper is formulated based on one-bar microslip analytic model, the microslip friction model can describe the stick-sliping state, and friction force being out of phase in the damper. The nonlinear properties of the friction damper are linearized as equivalent damping and stiffness using the Lazan＇s method. The dry friction damping factor is introduced to measure the effect of friction damping on blades. Forced response of a simplified blade system with a friction damper is calculated using the harmonic balance method. The results show that dry friction damper influence dynamic properties of blades on both sides of damping and stiffness. Dry friction damping factor is a good parameter for estimating the effect of damper on blades. There is an optimal normal load with which the value of friction damping factor is maximum, and the response is minimum.
出处
《振动工程学报》
EI
CSCD
北大核心
2008年第5期505-510,共6页
Journal of Vibration Engineering
基金
国家863计划资助项目(2007AA04Z1A1)
国家自然科学基金资助项目(50675169)
陕西省自然科学基础研究计划资助项目(2005E220)
国家973计划资助项目(2007CB707706)
关键词
叶片
稳态响应
微滑移解析模型
谐波平衡法
干摩擦阻尼因子
blade
steady state response
microslip analytic model
harmonic balance method
dry friction damping factor
