Research On Lightweight Technology Of Electric Sweeper Frame Structure

As an important part of road sanitation vehicles,pure electric sweeping vehicle is more and more widely used.However,due to vehicle battery technology reasons,cruising ability is the main problem that restricts the rapid development of pure electric sweeping vehicle.As a key bearing parts of the vehicle,The weight of frame is one of the sources of energy consumption.Therefore,it is very important to research the lightweight design of the frame structure.In this paper,considering the influence of dynamic and static performance of frame,the electric vehicle frame was chosen as the research object to reduce the weight of the frame.The finite element analysis,topology optimization method and size optimization method were combined to apply to the structure optimization design of the frame.The main work and conclusions are as follows:(1)Aiming at the working characteristics of the sweeping vehicle,the vehicle design scheme was put forward,the main parameters and layout were determined,on this basis,a new type of adjustable double roller brush cleaning mechanism was designed,And the whole vehicle hydraulic system circuit was designed.Then the three-dimensional model of the frame structure was established,according to the static analysis results,the stress distribution and deformation of the frame were discussed.The results show that the frame strength meets the requirements and has a large optimization space.(2)The initial three-dimensional model of topology optimization frame was established by Pro/E,using HyperMesh for meshing,applying loads and constraints,using OptiStruct to optimize the topology of the frame,and from the perspective of static analysis,The strength of the optimized frame was verified.The results show that the frame strength satisfies the requirement,but there was still the optimization potential,and the second optimization was adopted by the size optimization method.The finite element model of the frame was established in HyperMesh.The main stringer and the beam thickness were the design variables,the safety stress was the constraint condition,the quality of the frame itself was the objective function.And the optimized frame parameters were rounded,then compared with the topology optimization frame analysis and verification.The results show that the stress of each working condition was increased within the allowable safety stress range,and the frame material was fully utilized.Compared with the original frame,the quality of the optimized frame was reduced by 20.7%.Achieveing a better lightweight effect.(3)The dynamic characteristics of the optimized frame was simulated,The results show that the first six modal frequencies of the frame avoid the excitation frequency of the road surface 10.8Hz,The frame does not produce resonance,the dynamic characteristics of the vehicle was better.At the same time,by using the topology and size optimization method,the rationality and feasibility of the lightweight design of the frame were verified.