航空发动机整机振动半实物建模方法研究

Study on a Semi-Physical Method for Modeling Overall Vibration of an Aero-Engine

关键词:  子结构方法  转子动力学  有限元方法  模态分析  测试技术

Key words:  Substructure method  Rotor dynamics  Finite element method  Modal analysis  Testing technology

摘要:

为了研究一种快速准确地分析航空发动机整机振动的建模方法，采用试验与仿真结合，在转子模型中综合机匣-支承试验数据的半实物建模方法，对整机振动半实物建模原理，机匣-支承传递函数测试、结构综合建模等问题进行了研究，运用航空发动机转子试验器对半实物建模方法进行验证。建立试验器整机及半实物仿真模型，计算机匣振动响应；拆装转子试验器，测试机匣-支承连接位置频率响应函数，综合转子有限元模型，建立基于试验数据的试验器半实物模型，计算整机频率响应函数。结果表明，半实物建模方法能够在保证计算精度的前提下缩减90%以上的计算时间，运用半实物模型能够准确地获得整机频率响应函数，固有频率计算误差在2%以内。

Abstract:

In order to study a modeling method to analyze the overall aero-engine vibration problem more quickly and precisely and precisely，a semi-physical modeling method which combines testing and simulation modeling method together is used. The casing-support testing data is set into rotor finite element model during the modeling procedure. The overall vibration semi-physical modeling principle，casing-support structure transfer function testing and synthesized modeling method are studied. An aero-engine rotor tester is used to validate the semi-physical modeling method. The rotor tester overall and semi-physical simulation model are built to calculate the casing vibration responses. The rotor tester is disassembled to test the casing-support frequency response function which is synthesized with the rotor finite element model. The overall aero-engine tester semi-physical model based on testing data is built to calculate the overall aero-engine frequency response function. The results show that semi-physical modeling method can not only maintain the calculation accuracy，but also reduce more than 90% of the computation time. The semi-physical model can obtain the overall aero-engine frequency response function fast and precisely，and the nature frequency calculation error is less than 2%.