涡轮增压器超高速轴承-转子动力学建模及模态参数识别  

Dynamic Modeling and Modal Parameter Identification of Ultra-high Speed Bearing-Rotor of Turbocharger

作　　者：公平 胡振辉 张庆山 门日秀[3] 裴世源[2] Ping Gong;Zhen-hui Hu;Qing-shan Zhang;Ri-xiu Men;Shi-yuan Pei(China Aviation Development Harbin Bearing Limited Company;Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System,Xi’an Jiaotong University;National key Laboratory of High Turbocharging Technology for Diesel Engine,North China Engine Research Institute)

机构地区：[1]中国航发哈尔滨轴承有限公司 [2]西安交通大学现代设计及转子轴承系统教育部重点实验室 [3]中国北方发动机研究所柴油机高增压技术国家级重点实验室

出　　处：《风机技术》2023年第1期57-63,共7页Chinese Journal of Turbomachinery

基　　金：国家自然科学基金资助项目(51975456)。

摘　　要：针对传统涡轮增压器超高速轴承-转子系统动力学建模精度不高、模态参数不易识别等问题,基于Timoshenko梁理论建立了涡轮增压器动力学模型及运动微分方程,利用锤击法试验对增压器不同激励位置、有无预紧力等工况下的模态参数进行了识别,并将理论与试验分析结果进行了对比验证。研究结果表明:激励涡轮增压器不同位置时,系统的激发模态不尽相同;预紧力对转子动力学分析结果具有重要影响,增加预紧力可显著提高转子刚度;建立的动力学模型和模态识别方法具有一定的准确性和适用性,可以为后续涡轮增压器结构优化设计、模态参数识别提供理论与试验基础。Aiming at the problems of traditional turbocharger ultra-high speed bearing-rotor system,such as low accuracy of dynamic modeling,difficult identification of modal parameters and so on,the dynamic model and differential equation of motion of turbocharger are established based on Timoshenko beam theory.The modal parameters of turbocharger under different excitation positions and with or without pre-tightening force are identified by hammering test.And the theoretical and experimental results are compared and verified.The results show that when the excitation turbocharger is in different positions,the excitation modes of the system are different.The pretightening force has an important influence on the dynamic analysis results of the rotor,and increasing the pretightening force can significantly improve the rotor stiffness.The established dynamic model and modal identification method have certain accuracy and applicability,which can provide theoretical and experimental basis for subsequent turbocharger structure optimization design and modal parameter identification.

关 键 词：Timoshenko梁有限元理论 动力学建模 涡轮增压器 模态识别 频响函数 

分 类 号：TH133.2[机械工程—机械制造及自动化]