Dynamic stiffness characteristics of aero-engine elastic support structure and its effects on rotor systems:mechanism and numerical and experimental studies  

作　　者：Lei LI Zhong LUO Kaining LIU Jilai ZHOU 

机构地区：[1]School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819,China [2]Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China,Northeastern University,Shenyang 110819,China [3]Foshan Graduate School of Innovation,Northeastern University,Foshan 528312,Guangdong Province,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2023年第2期221-236,共16页应用数学和力学（英文版）

基　　金：the National Natural Science Foundation of China(Nos.11872148 and U1908217);the Fundamental Research Funds for the Central Universities of China(Nos.N2224001-4 and N2003013);the Basic and Applied Basic Research Foundation of Guangdong Province of China(No.2020B1515120015)。

摘　　要：The support structure of a rotor system is subject to vibration excitation,which results in the stiffness of the support structure varying with the excitation frequency(i.e.,the dynamic stiffness).However,the dynamic stiffness and its effect mechanism have been rarely incorporated in open studies of the rotor system.Therefore,this study theoretically reveals the effect mechanism of dynamic stiffness on the rotor system.Then,the numerical study and experimental verification are conducted on the dynamic stiffness characteristics of a squirrel cage,which is a common support structure for aero-engine.Moreover,the static stiffness experiment is also performed for comparison.Finally,a rotor system model considering the dynamic stiffness of the support structure is presented.The presented rotor model is used to validate the results of the theoretical analysis.The results illustrate that the dynamic stiffness reduces the critical speed of the rotor system and may lead to a new resonance.

关 键 词：dynamic stiffness squirrel cage rotor system dynamic characteristic critical speed 

分 类 号：V231.96[航空宇航科学与技术—航空宇航推进理论与工程]