摘要
转子系统在启动、停车等瞬态过程中常常会产生剧烈的振动,如果让转子系统快速通过共振区则可以有效地降低转子系统瞬态过程的最大振幅.但是实际工况表明,有时转子通过设计的临界转速达到工作转速之后,振幅仍然很大,这一现象利用线性转子系统模型不能得到合理的解释.本文考虑转子支承非线性刚度的影响,建立了转子—支承系统的多自由度非线性模型,利用摄动理论和数值仿真解释了这一现象.此外本文还定量研究了起动、制动加速度的大小对转子系统瞬态过程最大振幅的影响.
Serious vibrations often occur in the transient processes of rotor sysytems either at starting or shutting dowmn. If a rotor system passes through the resonance area rapidly the maximum amplitude of vibration will be apparently reduced.But much practical experience showed that sometimes the amplitude is still big even when the rotor system approach the critical speed or reach the working speed.The phenomenon can not be explained in a linear model.In this paper the effects of nonlinear supports are considered and a non linear MDOF model of rotor support system is established.Based on perturbation theory and digital simulation the phenomenon is explained. Influence of acceleration of starting and shutting off on the maximum amplitude of transient processes is also studied in this paper.
出处
《西安建筑科技大学学报(自然科学版)》
CSCD
1999年第2期119-122,共4页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
关键词
非线性弹性支承
转子系统
瞬态过程
non linear flexible support,rotor system,transient process