摘要
Abstract
The investigation on dynamical behavior of an aero-engine rotor system with loose inner ring was performed.The relative motion between the inner ring and the lock nut was proposed according to the geometrical and structural features of a loose inner ring,based on which the calculation method of the shding frictional load on the lock nut was presented.This project set up a model for a vertically assembled rotor with loose inner ring,which accounted for both the stiffness nonlinearity and the damp nonlinearity introduced by the clearance and the frictional load on the lock nut respectively.The dynamical equation was solved numerically,which gave the dynamical responses of the rotor system,like wave plot,frequency spectrum and locus of the disk center,etc.The influences of the structural parameters on the rotor,say,the unbalance mass of the rotor,the clearance between the inner ring and the journal,the tightening torque of the lock nut,were identified quantitatively.It turned out that the synchronous forward whirl was promoted and the instability of the rotor was possibly to occur due to the internal friction dependent on relative sliding motion and proportional to the tightening torque;a rotor instability was observed with frequencies,say,the nature frequency,the rotating frequency,and the difference between them;the boundary of rotor instability was defined in terms of parameters,say,unbalance mass,the clearance between the inner ring and the journal and the tightening torque;an appropriate parameter condition was of significance to avoid the rotor instability.关键词
内环松动/锁紧螺母/拧紧力矩/滑动摩擦/失稳Key words
loose inner ring/lock nut/tightening torque/sliding friction/instability/design experiment/vibration analysis分类
航空航天
