The Simulation Analysis And Optimum Design Of The Arm Frame Structure Of The Folding High Altitude Operating Vehicle

With the progress of society and the development of economy,the aerial working vehicle as a kind of mechanical construction equipment is applied more and more in all walks of life,such as fire rescue,municipal construction,high-altitude building,wind turbine installation and so on,which also puts forward higher requirements for the performance and safety of high altitude operating vehicles.The boom system is the main bearing part of the operation vehicle.Its performance not only directly affects the working stability and safety of the aerial work vehicle,but also determines the quality and economy of the whole vehicle.Therefore,the study of boom structure has become a focus in the field of aerial vehicle research.It is significant to analyze the static and dynamic characteristics and optimize the design of boom structure.In this paper,the structure and working principle of the aerial working vehicle are introduced based on the arm system of the JB5060 JGKA type aerial work platform.The three-dimensional model of the arm frame structure is established by the 3D modeling software Pro/E5.0.The static analysis of several typical dangerous working conditions of boom structure are carried out by finite element analysis software ANSYS Workbench,the distribution of stress and strain are obtained,and the maximum stress and maximum strain value size and position are determined.Then the modal analysis of the arm structure is carried out,and the first six order natural frequencies and vibration modes are obtained,which provides a reference for the avoidance of resonance in the work.On the basis of the modal analysis,the harmonic response analysis and the random vibration analysis under fluctuating wind load are carried out.The analysis results show that the boom structure of the aerial work truck has good dynamic characteristics,and the design of the structure is reasonable.Secondly,using the Design Explorer module in Workbench,the parameters of the lower arm cross section of the arm are optimized.The response surface of each design variable to each optimization target is analyzed,and the optimization results of section parameters are obtained.The purposes of reducing quality and improving the comprehensive performance are achieved under the premise of strength and stiffness.Finally,the multi body dynamic simulation analysis of the arm frame structure is carried out in ADMAS,and with the minimization of the maximum force of the variable amplitude hydraulic cylinder as the optimization target,the hinge position of the arm frame is optimized,the maximum force of the optimized variable amplitude hydraulic cylinder has been obviously reduced,and the optimization goal is reached.The research on the boom structure provides a reference for the optimization design of the high-altitude operation vehicle,and provides a train of thought for solving similar engineering problems.