Research On Lightweight Of FSEC Racing Car Body Based On Crashworthiness

As a key technical means to improve the contradiction between automobile,energy and environment,automobile lightweight technology has become the key research of major automobile companies and scientific research institutes.As an important component of automobile,the frame plays a role in supporting and connecting various automobiles.The role of the assembly directly affects the stability and safety of the car.Therefore,the lightweight design for the safety of car crashes has important engineering application value.This article takes Xihua University’s 2019 formula racing tram frame as the research object.According to the rules of the race and the working conditions of the car in the actual competition as the analysis basis,the frame is carried out under the conditions of ensuring the strength,rigidity and crash resistance of the frame.Lightweight design,the research content mainly includes the following five aspects:(1)Master the requirements of the formula competition rules,the analysis method of the crashworthiness of the frame and the lightweight design requirements,combine the material selection,design and manufacturing process of the frame to complete the establishment of a three-dimensional model of the frame,and build a lightweight based on the crashworthiness of the frame design flow.(2)In accordance with the requirements of the formula racing competition,use Ansys Workbench to perform static analysis on the frame under five conditions of full-load bending,full-load torsion,high-speed turning,emergency braking and straight acceleration to verify the strength and rigidity of the frame,while using Abaqus conducted 100% frontal collision and40% frontal offset collision analysis on the frame,combined with the static analysis results of the frame and the collision analysis results,and formulated a structural optimization design scheme and a lightweight design scheme based on the crash resistance of the frame.(3)Experimental verification of the frame was perfomed to verify the accuracy of the frame’s finite element analysis.The comparison error between the test results and the simulation analysis was within 15%.The quantitative design plan has guiding value.(4)Carry out the structural optimization design for the crashworthiness of the frame in accordance with the competition rules,strengthen the front partition support system and the main roll cage part of the frame,and change the upper and lower diagonal braces of the front partition support system to square tubes,The arrangement of the pipe fittings on both sides of the front bulkhead support system was adjusted and the main roll cage diagonal brace was added,and the structural optimization of the frame was carried out for static analysis and collision analysis verification.The analysis results showed that the deformation of the frame was improved significantly.(5)Lightweight design was perfomed on the optimized structure of the frame combined with the experimental design method.79 sample points were selected through optimal Latin hypercube sampling,and the kriging proxy model was used to verify the sampling accuracy.The frame was tested by a multi-objective genetic algorithm.Carrying out parameter optimization,and carrying out statics analysis and collision analysis verification on the frame after parameter optimization,the frame mass was reduced from 31.107 kg to 28.546 kg,realizing 10.46% weight reduction.