Design And Optimization Of Rail-type Bridge Inspection Vehicle For Double-deck Bridges

As a kind of special vehicle that provides professional operation platform for bridge maintenance,bridge inspection vehicle has become an indispensable equipment in bridge maintenance and maintenance projects.In view of the structural form and maintenance requirements of a double-deck bridge,the structural characteristics of various traditional bridge inspection vehicles are combined in this paper to design a new type of rail-type bridge inspection vehicle that can travel under the beam in the longitudinal bridge direction and in the transverse bridge direction.While covering the detection area,one-vehicle detection of the whole bridge is realized.After completing the simulation analysis of dynamics,finite element and rigid-flexible coupling,a physical prototype was developed to complete the relevant test verification work.Mainly carried out the following work:(1)The structural design of the bridge inspection vehicle.Firstly,based on the bridge structure and testing needs,the overall design of the bridge inspection vehicle is clarified.Secondly,the track,running mechanism,turntable,truss and boom and other devices are designed respectively and the relevant functional verification tests are completed.(2)Motion path planning and dynamic simulation analysis.Firstly,the multi-rigid body virtual prototype of the bridge inspection vehicle is established by the multi-body dynamics simulation analysis software ADAMS,and the motion path planning is carried out to obtain the motion parameters of the hydraulic cylinder.Secondly,using the optimization design method in the virtual prototype,the maximum force of the oil cylinder is optimized by adjusting the position of the hinge point of the oil cylinder.(3)Static analysis and modal analysis.According to the dynamic simulation results,the dangerous working conditions of the bridge inspection vehicle are determined,the finite element model simplification and mesh division are completed with the help of the finite element analysis preprocessing software Hyper Mesh,and the large-scale finite element software ANSYS is used for static strength checking and modal analysis.(4)Analysis of rigid-flexible coupling of boom.With the help of ANSYS,the modal neutral files of the boom and the middle arm are generated,and the rigid-flexible coupling virtual prototype of the bridge inspection truck boom is established in ADAMS,and the force condition of the oil cylinder is obtained by simulation,and the crane is monitored under the influence of the deformation of the flexible body.The gap between the basket and the bridge realizes the identification of whether the gondola and the bridge collide.(5)Hydraulic system design.According to the working conditions of the bridge inspection vehicle,design the hydraulic circuit that meets the movement of each component,formulate the schematic diagram of the hydraulic system,and determine the parameters and models of the main hydraulic components.And through the test to verify the functionality of the hydraulic system.