Strength Analysis And Structural Optimization Of A45 Folding Arm Self-propelled Aerial Work Platform

Folding arm self-propelled aerial work platform is a multi-functional aerial work equipment.It has many advantages,such as high efficiency,simple operation and stable operation.It is used for maintenance,clean and setup in the high altitude.As the aerial work platform is operated by human beings at high altitude,its safety must be guaranteed,and its structure should be more economical and reasonable on the premise of satisfying safety.Therefore,strength analysis and structure optimization of the folding arm self-propelled aerial work platform have positive significance to promote the development of China’s aerial work platformIn this paper,mechanical analysis,strength analysis and structure optimization of A45 folding arm self-propelled aerial work platform are studied,the effective theoretical method is obtained,which can provide theoretical support for structural analysis and optimization of folding arm aerial work platform.The main work in this paper can be summarized in the following content.(1)The driving force of the flying arm hydraulic cylinder,the leveling hydraulic cylinder and the telescopic arm hydraulic cylinder are analyzed by using the traditional statics method.The driving force of the folding arm hydraulic cylinder is analyzed by using static method and principle of virtual work,and the results obtained by the two methods are compared and analyzed,which proves that the results obtained by statics method are more safe in engineering practice.The expressions of the driving force of each hydraulic cylinder with the change of amplitude angle is deduced,the curve diagram of each hydraulic cylinder driving force with the change of amplitude angle is drawn by MATLAB software.At the same time,the maximum driving force of each hydraulic cylinder and the amplitude angle of its position are obtained.(2)On the basis of the hydraulic cylinder driving force analysis,the hinge point forces of the flying arm,telescopic arm and folding arm are calculated in a top-down manner,and the potential dangerous working conditions of each arm are analyzed,so as to prepare for the finite element strength analysis of the each arm.(3)Three-dimensional model of A45 aerial work platform is established with SoildWorks software,the A45 working arm calculation model is divided,the model is imported into ANSYS Workbench software for pre-processing and stress analysis,the strength of flying arm,telescopic arm and folding arm are checked according to the stress results.Finally the results are analyzed to determine the dangerous working condition and dangerous point of the each arm,which can provide the basis for the structural optimization.(4)A six-variable optimization mathematical model with the minimum leveling error as the objective function is established.The geometric space position constraint,triangle constraint,hydraulic cylinder expansion ratio constraints are considered,genetic algorithm optimization toolbox in MATLAB is used to optimize it,so that the leveling error is minimized and the safety performance of the working platform operators is improved.(5)The whole telescopic arm is taken as the research object,the parametric modeling of the telescopic arm is carried out by using SolidWorks software.The structural size of the telescopic arm is taken as the optimization parameter,the maximum stress of the telescopic arm is less than the allowable stress as the constraint condition,and the minimum mass of the telescopic arm as the objective function,search and optimize the design points in the range of design variables is used by response surface method,so that the telescopic arm meets the strength requirements and the mass is minimized.