虚拟激励法在叶轮随机振动分析中的应用  

Application of Pseudo-Excitation Method in Random Vibration Analysis of Impellers

作　　者：王跃方[1] 王素景 

机构地区：[1]大连理工大学工程力学系,辽宁大连116023

出　　处：《风机技术》2014年第1期13-19,36,共8页Chinese Journal of Turbomachinery

基　　金：国家重点基础研究发展计划(批准号2009CB724300;2011CB06504);沈鼓-大工重大科技发展基金支助

摘　　要：叶轮在运转过程中受到各种随机气动载荷的作用。分析时可以采用时域方法,用单向耦合方式求解结构的位移及应力响应,但整个多载荷步瞬态分析十分耗时。本文基于频域分析,采用虚拟激励法求解随机气动载荷作用下叶轮结构的响应问题,同时利用ANSYS谐响应分析模块及APDL命令流,实现了多维多点虚拟激励法在离心式压缩机叶轮的工程应用,得到叶轮结构的响应谱特征,继而求得响应的均值、方差、各阶谱矩等,为求解叶轮的超越概率以及可靠度指标等打下了基础。Impellers are loaded in the operation process under the action of various random aerodynamic forces. Time domain-based methods can be used in displacement and stress analyses with one-way coupling strategy. However, the entire multiple load steps for transient analysis are extremely time-consuming. In this paper, the pseudo-excitation method based on frequency domain analysis is adopted to solve the random response problems of the impeller under the action of aerodynamic load. The multi-dimensional, multiple point virtual excitation is applied to the impeller through harmonic response analysis provided by ANSYS and the ANSYS APDL commands to obtain the response spectrum characteristics of the impeller structure. The mean value, variance and orders of moment etc. of the response spectrum are then determined, which lays a foundation for solving the probability and reliability index of the impeller.

关 键 词：叶轮 随机振动 气动载荷 谐响应分析 虚拟激励法 

分 类 号：TH452[机械工程—机械制造及自动化]