Optimization Design Of Truss Structure And Research On Track Walking System Of Tethered Bridge Inspection Vehicle

In order to ensure the safety and normal operation of the bridge,the bridge inspection vehicle is widely used in the inspection and maintenance of bridge facilities due to its strong bearing capacity and good mobility.The bridge inspection vehicle is composed of truss structure and walking system.The low strength of traditional truss structure joints affects the stability of the inspection vehicle,so the structure needs to be optimized.In addition,the traditional walking system has a single function and high cost,so there are many problems in the walking system.Based on the theory of dynamic and static mechanics,finite element and optimization design,this thesis takes Solid Works,ANSYS and other software as the platform,and adopts the method of combining theoretical basis with computer modeling and simulation to optimize the design of tethered truss structure of bridge inspection vehicle and analyze the crawler walking system.The main work is as follows :(1)According to the work requirements of the bridge inspection vehicle,the overall design layout of the inspection vehicle is carried out.The design and theoretical calculation of the tied truss structure are carried out to determine the basic parameters of each component.(2)The parametric model of the bridge inspection vehicle is established by Solid Works.The static and modal analysis of the tethered body truss is carried out by ANSYS finite element analysis software.The total deformation,stress cloud diagram and modal shape diagram are obtained,and the weak links in the structure are found.The response surface optimization design of the tethered car body truss is carried out.The response surface optimization design of the tethered body truss has achieved the goal of structural lightweight.(3)It is proposed to apply the crawler walking scheme to the bridge inspection vehicle,calculate and select the key equipment in the crawler walking system,and design a segmented track system suitable for the crawler walking of the bridge inspection vehicle.At the same time,a lateral rail-changing walking system is designed to solve the walking problem of the current bridge inspection vehicle on the wide crosssection super-large bridge.(4)The crawler walking control system based on PLC remote control is studied.The control system can realize forward,backward,emergency braking and lateral orbit change according to the requirements of the operator.In addition,a power supply monitoring system is developed,which can monitor the power in real time and send an alarm in the case of low power.(5)Finally,the designed bridge inspection vehicle is tested under multiple working conditions.The results show that the bridge inspection vehicle can fully realize the preset actions and functions,and has the characteristics of safety,durability and economic application.This study has a strong reference and reference significance for the design and application of bridge inspection vehicles in other similar projects at home and abroad.