Structural Design And Application Analysis Of Piecewise Linear NES Of Rotor System

Vibration is an inevitable phenomenon in the rotation of the rotor system.Severe vibration will cause serious damage,endangering the healthy operation of rotating machinery,and hindering the life production of the national economy.However,the problem that has been plagued is the instability of the rotor system during resonance and a series of other faults and failures.As a common structure for reducing resonance,the vibration absorber has many defects,such as the effective vibration absorption band of the passive vibration absorber;the active vibration absorber has a complicated structure and low reliability.Therefore,these two conventional shock absorbers applied to the rotor system for vibration suppression are gradually abandoned.(1)A fitting design method for fitting nonlinear cubic stiffness with piecewise linear stiffness is proposed.Two kinds of piecewise linear NES for single-degree-of-freedom main system vibration suppression are designed.In contrast,the piecewise linear NES selected for the rotor-NES system was determined,but three-dimensional.(2)Three kinds of piecewise linear NES for rotor system vibration suppression are designed.The inherent characteristics of the elastic rod are analyzed.The dynamic equations of three rotor-NES systems are established.When analyzing the vibration suppression of the isotropic rotor system,the bearing type NES suppresses the steady-state resonance best,and the grounded NES suppresses the transient shock best.The NES wide-band vibration suppression capability are analyzed and the linear vibration absorber’s vibration suppression capability are compared.Finally,the steady-state vibration of the anisotropic rotor system is analyzed by the bearing type NES,and the vibration damping capacity of the linear vibration absorber is compared and analyzed.(3)The parameters of the bearing type NES and the parameters of the rotor system are analyzed.And the parameter analysis of the coupled system vibration suppression is performed;The parameter analysis of the NES installation position is also performed.According to the analysis,when the NES is installed on different nodes of the rotor system shaft,the difference in the steady-state resonance suppression effect of the rotor system is not significant.The adaptability of NES is the main reason.(4)The test rig of the isotropic rotor system and the bearing type NES coupling system is built.The vibration reduction of the rotor system with different parameters NES and the broadband vibration suppression of the NES are verified by experiments.This part of the operation starts from the two aspects of frequency domain analysis and time domain analysis;comprehensively analyzes the experimental content and test results,and verifies the correctness of the simulation analysis in the last two chapters.