Research On Topology Optimization And Dynamic Characteristics Of Key Components Of Emergency Rescue Vehicle Under Multi-condition Loads

This paper summarizes the development status and importance of emergency rescue obstacle removal vehicle,summarizes the main development history,content and research methods of multi-body system dynamics,and summarizes the main analytical and numerical methods of topology optimization.This paper optimizes the hinge position,structure form and structure size of the key components of the emergency rescue obstacle removal vehicle.Firstly,aiming at the problem that the active power of the working device can not be effectively exerted,aiming at the full exertion of the excavating force of the excavating device and the most labor-saving of the cylinder of the loading working device,the coordinate positions of the key hinge points of the two working devices are optimized by using the Autodesign tool,so that the working device can get a more reasonable layout of the hinge points,the scope of operation and the development of the working ability.The swing degree has been effectively improved.Secondly,in view of the unreasonable structure of the working device,through establishing the rigid-flexible coupling model of the working device and using Recurdyn to carry out dynamic simulation,the stress condition of the hinge points needed for the optimization of the components is obtained.By setting up a number of static simulation experiments,the optimal meshing mode is selected,and then the goal is to reduce the ineffective quality of the structure,under the optimal mesh quantity condition.By using ANSYS,the structure of the key components of the operation device is optimized,which makes the components get a more reasonable structure.Finally,aiming at the problem of unreasonable dimension of components in the working device,the dimension parameters are set as design variables.Through setting up single variable simulation experiments and multi-variable orthogonal simulation experiments,the single variable numerical fitting formulas and multi-variable numerical fitting formulas between the maximum equivalent stress of components and the quality of components and the various dimension variables are explored;and two multi-variable numerical fitting formulas are put forward.Minimization is set as the optimization objective,and genetic algorithm is used to optimize the size of key components of the operation device.Through three times optimization,the functional characteristics and structural characteristics of the working device have been improved.The optimization method in this paper can provide reference for other related design.