Dynamic Characteristics Analysis of Rotor System with Fitting Tightness of Elastic Ring Support Structure

doi:10.3901/JME.2023.13.124

Abstract

Abstract: As the typical elastic support structure in aeroengine, the fitting tightness of elastic ring support structure greatly affects the stiffness of the support system, and further affects the dynamic characteristics of the rotor system, but there are few relevant researches. Therefore, the finite element model of elastic ring support structure is established firstly, and the influence of fitting tightness on its stiffness and strength is analyzed. It is found that the fitting tightness of the elastic ring support structure can be judged by the relationship between the displacement when the segment stiffness appears and the height of the boss. Then carry out the relevant experimental platform. The correctness of the simulation results are verified by comparing with the experimental results. Finally, the finite element model of rotor system considering the fitting mode of the elastic ring supporting structure is established, and the influence of the model on the characteristics of the rotor system dynamics is studied. The results show that the elastic ring support structure with interference fit will increase the critical speed of the rotor system, while the clearance fit will decrease the critical speed, and cause nonlinear vibration of the rotor system. The research results can provide theoretical reference for the design of the rotor support system with elastic ring support structure.

Key words: elastic ring support structure, fitting tightness, support stiffness, finite element method, rotor system

CLC Number:

V231
TB123

LUO Zhong, LIU Jiaxi, LI Lei, WU Fayong, GE Xiangdong. Dynamic Characteristics Analysis of Rotor System with Fitting Tightness of Elastic Ring Support Structure[J]. Journal of Mechanical Engineering, 2023, 59(13): 124-132.

References

[1] WANG M,HAN Q,WEN B,et al. Modal characteristics and unbalance responses of fan rotor system with flexible support structures in aero-engine[J]. Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering,2017,231(g9):1686-1705.
[2] LUO Z,LI L,YANG Y,et al. Experimental and numerical investigations on novel models for mechanical behaviors of the elastic ring in aero-engine[J]. Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science. 2021:2141141582.
[3] WANG Z,LIU Z,ZHANG G,et al. Dynamic characteristics of elastic ring squeeze film damper. Industrial Lubrication and Tribology,2019,71(10),1144-1151.
[4] MA Y,ZHU H,ZHANG D,et al. Experimental investigation on dynamic mechanical behavior of the elastic ring support with metal rubber[C]//ASME 2013 International Mechanical Engineering Congress and Exposition,2013.
[5] 刘勇,文立华. 弹性环式柔性支撑有限元分析及结构参数选择[J]. 机械科学与技术,2012,31(11):1744-1747. LIU Yong,WEN Lihua. FEM analysis and structural parameter selection of elastic rings[J]. Mechanical Science and Technology for Aerospace Engineering,2012,31(11):1744-1747.
[6] HEIDARI H R,SAFARPOUR P. Design and modeling of a novel active squeeze film damper[J]. Mechanism and Machine Theory,2016,105:235-243.
[7] BAI C,XU Q,WANG J. Effects of flexible support stiffness on the nonlinear dynamic characteristics and stability of a turbopump rotor system[J]. Nonlinear Dynamics,2011,64:237-252.
[8] DOUSTI S,GERAMI A,DOUSTI M. A numerical CFD analysis on supply groove effects in high pressure,open end squeeze film dampers[J]. International Journal of Engineering Innovation & Research,2016,5(7):80-89.
[9] SIEW C C,HILL M,HOLMES R. Evaluation of various fluid-film models for use in the analysis of squeeze film dampers with a central groove[J]. Tribology International,2002,35(8):533-547.
[10] 王四季,廖明夫,刘永泉,等. 航空发动机轴承外环装配工艺引起的转子系统非线性振动[J]. 航空动力学报,2015,30(1):82-89. WANG Siji,LIAO Mingfu,LIU Yongquan. Nonlinear vibration of rotor systems caused by assembly process of a bearing outer ring of an aero-engine[J]. Journal of Aerospace Power,2015,30(1):82-89.
[11] DILIGENSKIY D S,NOVIKOV D K. Studying of manufacturing tolerance influence on the performance of GTE rotor elastic rings[J]. Procedia Engineering,2017,176(Complete):483-497.
[12] ZHANG W,DING Q. Elastic ring deformation and pedestal contact status analysis of elastic ring squeeze film damper[J]. Journal of Sound & Vibration,2015,346:314-327.
[13] 苏春峰. 弹性环式挤压油膜阻尼器动力特性研究[D]. 沈阳:沈阳航空工业学院,2009. SU Chunfeng. Study on dynamic characteristics of elastic ring squeeze film damper[D]. Shenyang:Shenyang Institute of Aeronautical Engineering,2009.
[14] 李岩,廖眀夫,王四季. 配合关系对弹性环式挤压油膜阻尼器减振特性的影响[J]. 振动与冲击,2020,39(11):232-238. LI Yan,LIAO Mingfu,WANG Siji. Effect on vibrating attenuation by the fit of elastic ring squeeze film damper[J]. Journal of Vibration and Shock,2020,39(11):232-238.
[15] ISHIDA Y,INAGAKI M,EJIMA R,et al. Nonlinear resonances and self-excited oscillations of a rotor caused by radial clearance and collision[J]. Nonlinear Dynamics,2009,57(4):593-605.
[16] YABUNO H,KASHIMURA T,INOUE T,et al. Nonlinear normal modes and primary resonance of horizontally supported Jeffcott rotor[J]. Nonlinear Dynamics,2011,66(3):377-387.
[17] CHEN G. Vibration modelling and verifications for whole aero-engine[J]. Journal of Sound & Vibration,2015,349:163-176.
[18] 刘闯,陈国栋,杨阳,等. 基于有限元仿真的弹性环刚度特性分析[J]. 沈阳航空航天大学学报,2019,36(3):8-13. LIU Chuang,CHEN Guodong,YANG Yang,et al. Stiffness analysis of elastic ring based on finite element simulation[J]. Journal of Shenyang Aerospace University,2019,36(3):8-13.
[19] HAN Z,MA Z,ZHANG W,et al. Dynamic analysis of an elastic ring squeeze film damper supported rotor using a semi-analytic method[J]. Engineering Applications of Computational Fluid Mechanics,2020,14(1):1263-1278.