干摩擦阻尼叶片的高保真有限元模型振动特性研究  

Investigation of Vibration Characteristics for Dry Friction Damped Blades with High-fidelity Finite Element Model

作　　者：刘天源[1] 谢永慧[1] 张荻[1] LIU Tianyuan;XIE Yonghui;ZHANG Di(School of Energy and Power Engineering, Xi＇ an Jiaotong University, Xi＇ an 710049, China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《噪声与振动控制》2018年第A01期92-95,共4页Noise and Vibration Control

摘　　要：研究考虑干摩擦效应的整圈阻尼叶片高保真有限元模型振动特性:首先建立透平机械叶盘结构在周期激振力下的多谐波有限元方程,利用固定界面模态综合法降低整圈叶盘结构的有限元方程自由度,并给出求解多谐波平衡法中非线性方程的步骤;最后以某透平叶片的高保真有限元模型作为算例,验证算法的高效性和准确性:采用多谐波平衡法在保证计算精度(最大误差1.36%)的同时大幅降低计算耗时(由12小时降至2小时);进一步分析了阻尼器的干摩擦效应对叶片的非线性振动特性的影响,为叶片阻尼结构的减振设计提供依据。This paper focus on the vibration characteristics of damped blades for high-fidelity finite element model（FEM） considering dry friction damping. Firstly, the multi-harmonic balance equation is established to predicate the steady response of the bladed-disk under periodic excitation. The component mode synthesis method based on fixed-interface model is applied to reduce the DOFs of the equation. Then, the algorithm to solve the nonlinear multi-harmonic balance equation is given step by step. Finally, high-fidelity FEM of a turbine bladed disk was used to demonstrate the excellent performance with the speed and accuracy of the method. The numerical simulation showed that the method can reduce the time-consuming of the calculation significantly（from 12 hours to 2 hours） while the accuracy keeps appropriate（maximum error 1.36%）. Furthermore, the effects of the dry friction were analyzed for the nonlinear vibration characteristics of the blades, which can provide the basis for the design of the damped blades.

关 键 词：振动与波 阻尼叶片 干摩擦阻尼 有限元分析 多谐波平衡法 

分 类 号：O241.82[理学—计算数学]