Structural Design And Simulation Analysis Of The Upper-Car System Of The Road-Railway Dual-Use Basket-Type Bridge Inspection Vehicle

With the rapid development of the domestic economy and the increasing strength of railway transportation,as the infrastructure of high-speed rail,the inspection and conservation of high-speed rail bridge are getting more and more attention.Currently the "disease" bridge of railway in operation is occupying about 20% of the total number of bridges,and although the time of completion of high-speed railway bridges is short,it should be taken seriously.To ensure stability,comfort and safety of high-speed operation,the efficient and accurate testing with intelligent bridge comprehensive testing equipment in high-speed rail bridge is imperative.However,existing railway bridge inspection vehicle is still in the initial stage of development,and it is basically mainly imported.Therefore,there is an urgent need to develop a modern detection equipment suitable for the detection of railway bridges in China.By investigating the research status of bridge detection vehicles at home and abroad,the work content and working requirements of bridge inspection vehicles are determined.According to the particularity of the structure of road-railway,in this paper,a design scheme for the upper-car system of the basket-type bridge inspection vehicle for road-railway bridges is put forword,and the rationality of the scheme is verified.In this paper,the structural design of the upper-car system of the road-railway dual-use basket-type bridge inspection vehicle is made,and the reliability of the structure is analyzed.The study is as follows:(1)According to the given basic parameters and related information,the boom structure of the upper-car system is determined,where the rotation mechanism,the basket table and the hydraulic auxiliary system are designed.(2)By the actual work of the boom movement,the spatial transformation order of each boom is determined.The 3-D model of the upper-car system is established with SolidWorks to provide a data model for the static and dynamic analysis of the boom,and the Anti-overturning stability calculation wasperformed.(3)Simulating the external flow field of the system by CFX,the fluid properties are analyzed to verify the overall structural stability of the system with the wind load.(4)Using ADAMS to establish a virtual prototype,the simulation of multi-rigid-body dynamics is carried out on the prototype to obtain the dynamic characteristics of the boom stretching process.And the structure of the upper-car system is studied deeply according to the simulation results.(5)Using CFX-Workbench to conduct FSI,obtaining the static characteristics of the basket with wind load,the overall stability is analyzed and the strength,stiffness of the system are checked.Through systematic analysis and research,the results show that: The design of the upper-car system of the highway-railway dual-use basket-type bridge inspection vehicle can meet the functional requirements of structural stability;The mechanical properties of each boom meet the mandatory design standards;The design of the upper-car system can be a certain range of steady resistance cross wind interference that may occur at work;Using ADAMS to simulate the motion of the boom,it is found that the dynamic stability of the boom-in order process can meet the design requirements,and the body will not have a greater vibration;The static strength and rigidity of the basket under transient wind pressure meet the using requirements and design specifications;The design and selection of the upper-car system is reasonable.