Simulation Analysis And Optimization Design Of The Upper-car Of The Road-railway Dual-use Bridge Inspection Vehicle

The bridge inspection vehicle is a special vehicle used for bridge inspection and it is an indispensable special equipment in the field of bridge inspection.The research of railway bridge inspection vehicles in China are still in the initial stage.The bridge inspection vehicle in China mainly rely on imports,and ordinary bridge inspection vehicles are difficult to replace the inspection operations.Therefore,there is an urgent need to develop a modern bridge inspection vehicle for high-speed railway inspection.In this paper determines the working requirements and working parameters of the dual-purpose folding arm bridge inspection vehicle by investigating the structure of the domestic high-speed railway and subway.This paper proposes a design scheme for the structure of the vehicle-mounted structure of the dual-purpose folding arm bridge for the public railway,and demonstrates the rationality of the scheme.The Solidworks modeling software is used to establish the geometric model of the boarding structure.According to the working principle of the bridge inspection vehicle and the characteristics of the boarding structure,the vehicle structure model is simplified,and the initial model is provided for the simulation analysis below.In this paper,Adams is used to simulate the dynamics of the bridge under the bridge and the vehicle is simulated.The user-defined function is used to measure the centroid trajectory of the structure.The stability of the bridge inspection vehicle is analyzed by analyzing the centroid trajectory of the upper structure.The results show that the overturning moment is less than the stable torque and the bridge inspection vehicle is stable.According to the maximum position of the centroid offset,the most dangerous overturning condition is found,and the weight optimization calculation is performed under this condition.Finally,the load analysis of the key components was carried out to verify the rationality of the componentstructure.In this paper,the static and modal analysis of the structure of the bridge to detect the vehicle is carried out.The dynamics analysis shows the boundary conditions of the bridge inspection vehicle,and analyzes the strength,stiffness and modal analysis of the vehicle on the bridge.As a result,the surface bridge inspection vehicle meets the strength and stiffness requirements,and the external environment does not cause the bridge to detect the vehicle.The main component of the main arm variable amplitude structure of the bridge inspection vehicle is the main boom hydraulic cylinder.The mathematical model of the main arm luffing mechanism is established and analyzed.The position of the three hinge points has a great influence on the force of the main arm variable amplitude hydraulic cylinder..Therefore,the optimization of the position of the three hinge points can improve the stress of the hydraulic cylinder.Using Adams' s optimization analysis function,the coordinates of the three hinge points are used as the design variables,and the maximum force of the main arm variable amplitude hydraulic cylinder is the minimum to establish an optimized design.The results show that the force of the main arm variable amplitude hydraulic cylinder before and after optimization is improved by about 20%,which achieves the purpose of structural optimization.