Static Analysis And Optimization Of Folded-arm Bridge Inspection Vehicle Mounted Structure

As a special vehicle which is convenient for bridge inspectors to inspect bridges,the bridge inspection vehicle is equipped with various bridge inspection instruments,which not only improves the detection efficiency,but also saves the detection time greatly.It can not only move slowly at any time,but also make the inspectors safely and quickly to the relevant work location for inspection.The research content of this paper mainly comes from the optimization and analysis of the car structure of folded-arm bridge inspection vehicle,which is a cooperative project between Jilin University and XX Group.Taking the car structure of QJZ18 A folded-arm bridge inspection vehicle as the research object,this paper simulates the connection relationship among the components in a reasonable simplified way,and then establishes the finite element model for the calculation and detailed calculation of QJZ18 A boarding structure scheme.Prepare for subsequent structural optimization and parametric software development.Firstly,the scheme calculation of the boarding structure is carried out.BEAM188 element is used to simulate the boom and turntable,LINK180 element is used to simulate the cylinder,and MPC184 element is used to simulate the slider and hinge.Using ANSYS parametric language and DOS language,the finite element program calculation model is established.Four section stress results of telescopic arm 3 are compared with those of analytical method to verify the accuracy of the model.By extracting the calculation results of 40 different working conditions,dangerous working conditions can be provided for subsequent detailed calculation.Secondly,the boarding structure is calculated in detail.The Pro/E model is established on the basis of the information provided by the manufacturer,and the detailed calculation model is established on the basis of the three-dimensional model.In the detailed model,the establishment of the detailed calculation model is different from the scheme calculation model.The boom and turntable structure are simulated by shell element,the slider is simulated by solid element,and the mechanical transfer characteristics between the boom and the boom in the real structure are simulated by slider.The accuracy of the model is verified by comparing the calculated results with the field measurements.Thirdly,structural optimization is carried out in the large stress area of some components to ensure the safety of operators and improve product performance as much as possibleFinally,the vehicle structure of QJZ18 A bridge inspection vehicle is encapsulated,including turntable,main arm,two-turn,vertical arm,telescopic arm,lifting arm and operation platform.The purpose is to select different cross sections of main arm,vertical arm and telescopic arm for similar type of bridge inspection vehicles,and to endow them with different thickness,so as to achieve the purpose of rapid modeling,analysis and calculation,and verify the feasibility of the scheme design.