Research On Stiffness Of Wire Strands For Ropeway Based On Finite Element Method

Wire strands is an important load-bearing component of passenger ropeway.During its working process,it not only bears the axial tension,but also bears the radial pressure exerted by the detachable grip on the wire strands.Using finite element method to study the axial and radial stiffness of wire strands can provide meaningful assistance for the selection of wire strands in the design process of ropeway system.This paper makes effort o the stiffness of wire strands for ropeway.A finite element model of the wire strands for ropeway with only axial tension is established to study the axial mechanical properties of the steel wire strands under axial tensions(50k N～450k N)during the working process;then build the finite element model of the steel rod clamped by the detachable grip and the steel wire strands clamped by the detachable grip,and solve the stress and deformation of each part under different axial tension and clamping force.Comparing the deformation of two different models of clamping jaw,to study the difference between the radial stiffness of the wire strands and the steel rod,to provide a reference for the design of detachable grip and the selection of wire strands.The main research work of the thesis is as follows:(1)Based on the analysis of the structural characteristics of the wire strands for ropeway,analyzed the relationship among lay distance,lay angle and helix radius of wire strands,the parametric equation of each wire centerline of the wire strands was deduced according to the differential geometry theory,and the modeling method for the geometric model of the6×K31WSR wire strands for ropeway was proposed;(2)A finite element model of the wire strands with a lay length(339mm)that only bears axial tension was established,after many finite element modeling experiments,a finite element solver suitable for solving a large number of complex contact relationships was determined.using Abaqus /Explicit solution to obtain the response of the wire strands under different axial tensions,the wire strands is equivalent to a cylinder,relationship between the equivalent elastic modulus and the axial tension is obtained;(3)Analyzed the working principle of the detachable grip,analyzed the force of detachable grip,determined the calculation formulas of holding force,anti-skid force and spring force,constructed finite element model of detachable grip clamping solid steel bar,and computed the stress of steel bar and the deformation of the clamping jaws under the different pulling force and spring preload,analyzed the variation of radial stiffness of steel rod following with spring preload,provides a reference for the design of the spring of detachable grip;(4)Established a finite element model of the wire strands clamped by the detachable grip,calculate the equivalent stress and deformation of the wire strands when the wire strands bears different axial tensions and the gripping force of the rope gripper,analyzed the finite element model of the wire strands clamped by the detachable grip,found out the variation law of the grip jaw displacement,the tension force and the anti-slip force following with the axial tension,studied the difference of radial stiffness between wire strands and steel rod;(5)The radial deformation measurement experiment of wire strands for ropeway is designed and completed,and the experimental results are in line with the expectation.The change trend of experimental value and simulation value of jaw deformation is basically consistent,which verifies the accuracy of the simulation model.The research work in the dissertation are available for the lectotype of wire strands for ropeways and the design and verification of important parts in passenger ropeways.