Parametric Modeling And Mechanical Properties Study Of The Wire Rope Ring In Wire Rope Isolator

As a typical nonlinear vibration isolator,wire rope vibration isolators are widely used in various vibration isolation systems,due to their wide application range and high vibration isolation performance.This study aims to analyze and study the working mechanism of the elastic element wire rope ring in the wire rope isolator,from the forward design of the wire rope vibration isolator.Through the parametric modeling design of the wire rope ring,a simple and fast solid modeling method is provided for the wire rope vibration isolator,the vertical stiffness mechanical analysis model of the wire rope loop is established,and its structural parameters are studied: wire rope diameter,wire rope ring diameter Influence on the mechanical properties of wire rope ring.The research has improved the design and manufacturing efficiency of wire rope vibration isolators,and can effectively avoid the test work of evaluating the stiffness of the steel wire rope isolator.The main research work is as follows:(1)Parameterized design of wire rope ring in wire rope vibration isolator.The geometric structure of the wire rope ring and the relationship between its twisting parameters are analyzed.Based on the space coordinate theory,the parametric equation of the wire centerline of n-twisted steel wire strands is established,and the solid model of wire rope ring are established to verify the effectiveness of the parametric design.The modeling efficiency of the wire rope ring is improved,and also laid the foundation for the finite element simulation analysis of the wire rope vibration isolator.(2)An analytical model of vertical mechanics of wire rope ring is established.Based on the elasticity theory of the space curved rod,the mechanical properties of a single curved spiral steel wire are studied,and then the expression of the bending stiffness of the steel wire rope is obtained.Then,the vertical mechanics analytical model of wire rope ring is established by using Castigliano’s second theorem and the theory of strain energy,which provides a theoretical basis for establishing the theoretical mechanics model of wire rope vibration isolator in the future.(3)Quasi-static tension-compression cyclic loading experiments were carried out on different wire rope rings.The results of experiments were processed and analyzed,and the influence of the displacement amplitude,the diameter of the wire rope ring and the diameter of the wire rope on the quasi-static vertical stiffness characteristics of the ring was studied.And through the test results,the validity verification analysis of the established mechanical analysis model of the vertical stiffness of the wire rope loop is carried out.The results show that: the diameter of the wire rope has the greatest influence on the vertical mechanical properties of the wire rope ring.The analytical model responds better in the compression part of the ring and poor in the tension part.This is due to the "hardening effect" caused by the increase in nonlinear contact during the wire rope stretching process.Generally speaking,the vertical stiffness mechanical analytical model is more accurate in describing the stiffness of the wire rope ring under compression.Therefore,after determining the stiffness suitable for a specific application,the established analytical model can also be used to inversely calculate the geometric characteristics of the wire rope ring and provide parameters for the forward design of the wire rope vibration isolator.