Research on Parameter Modeling of Rod-Fastening Rotor Macroscopic Nonlinear Stiffness Characteristics
LIU Jingyuan
CHENG Li
GAO Junyu
GUO Li
CHEN Jiao
Abstract：Aimed at the problem that nonlinear model description is not comprehensive and imprecise,com-bined with rotor dynamics method and finite element method,a rotor dynamic balance equation is built firstly,and the stiffness that contains a variety of contact deformation factors is expressed by unknown functions.A parametric modeling method is put forward.Parametric expression of meso-structure of rotor is made.Taking the bolt pro-tightening uneven and disk mass eccentricity angle as a nonlinear importing factor and an independent variable of the stiffness function,the parameter space is established.Through the simulation analysis to the rotor model in the case of parameter space based on the finite element meth-od,a mapping relation between the meso-structure characteristics and the macroscopic nonlinear stiffness characteristics is built,and macroscopic displacement characteristics and macroscopic nonlinear stiffness characteristics of rod-fastened rotor in the parameter space at the stable working are obtained.A stiffness function is fitted out.A macroscopic nonlinear dynamic model with the influence of the meso-structure is built.By doing so,this can provide a reference for rotor dynamic characteristics calculation.
Keywords：rod-fastened rotorpre-tightness forcemass eccentricityparameterizationfinite elementnonlinear stiffness
Publication Date：2016-01-01
Pages：6( 1-6 )