Reliability Analysis for Rubbing in Cracked Rotor System
The rubbing phenomenon occurs when a rotating element eventually hits a stationary partof the rotating machinery.Increasing the rotor speed and decreasing the radial clearance between therotating and the non-rotating parts can enhance the performance of the rotating machinery.This leadsto an increased risk of rubbing contact.Rotor rubbing is the source of numerous different phenomena,for example sub-and super-harmonic vibrations,amplitude jumps and rotor instability.So thereliability analysis and sensitivity analysis of rotor system with rubbing is important for designpurposes.Reliability analysis can help the designer to establish acceptable tolerance on rotor system.Sensitivity analysis can help the designer to know which problem in rotor system with rubbing isbeing solved and how the solution may affect the design of rotor system for system correction andreanalysis.On the basis of the dynamic equations of the cracked rotor system model and withconsideration of the random parameters including shaft stiffness and damping,disk damping,radialclearance and stator radial stiffness,the random responses of cracked rotor system are researched.Thereliability and sensitivity analysis of the cracked rotor system with rubbing are studied.According tothe discretization of random process and stress-strength interference theory,the transient reliabilitymodel of cracked rotor system with rubbing is proposed.The reliability for rubbing in cracked rotorsystem is obtained by way of statistical fourth moment method,Edgeworth series technique and firstpassage theory.Numerical results are also presented and discussed.
reliability analysis random responses sensitivity analysis cracked rotor system rubbing
C.Q.Su Y.M.Zhang
School of Mechanical Engineering & Automation,Northeastern University,110004,P.R.China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）