Modular Design Of Beam Bottom Inspection Vehicle And Wheel-rail Contact Analysis

In the daily maintenance and accomplishment of the bridge,the truss inspection vehicle is a kind of common maintenance equipment,its main function is to transfer the maintenance personnel and equipment to the bridge beam bottom any area that needs maintenance.At present,most of the design and research work of inspection vehicle is designed and manufactured for a single bridge,and no serialization and unified design of inspection vehicle for beam bottom has been formed.In this paper,through the statistics of the width of various types of Bridges in China,the serial and unit design of checking the owner’s truss,the module division of the driving system and the contact analysis of the wheels and rails was studied.The series and unit design of inspection owner truss structure was proposed and realized,which reduced the design time,manufacturing cost and delivery period of inspection vehicle.ANSYS was used to establish 5 kinds of length inspection truss models,and the natural frequencies of 5 kinds of length main truss were calculated by analyzing the influence of bridge width on the section size of main truss element under different working conditions.The finite element results showed that the maximum safety margin of the main truss could be reached when the main truss element was selected to calculate the maximum section height,and the first two natural frequencies in the horizontal direction of all trusses met the human comfort requirements.The fuzzy comprehensive evaluation model of the driving system was established by using the fuzzy comprehensive evaluation method.In addition to considering the degree of connection correlation,the degree of shape and position correlation,the degree of functional correlation and the assembly strength,the comprehensive correlation evaluation model was formed by taking into account the safety,cost,quality and reliability,and the comprehensive correlation matrix of the driving system parts was established.The module division of the driving system was completed by using Matlab software and genetic algorithm,which provided a basis for the modular design,maintainability design and rapid replacement of the driving system.Aiming at the deficiency of existing inspection wheels,a new type of compound wheels was designed.The wheel-rail contact analysis of the walking wheel used ABAQUS software to compare and analyze the stress state of the all-steel wheel,the steel-based wheel and the new composite wheel,which showed that the new composite walking wheel had good track contact,which was better than the original tire.For the packaging material of the new walking wheel,107 rubber with poisson’s ratio of 0.30 could ensure certain stiffness of the walking wheel,and its displacement was 35.77%lower than that of other materials.In addition,the major shape parameters such as groove depth,curvature,outer thickness of walking wheel and number of radial boss of walking wheel were optimized.The results showed that the Miss stress of the new type of walking wheel decreased by 18.27% compared with the original structure,and the contact stress decreased by 12.21%.To achieve the structure optimization of the new walking wheel.