Development Of The Rear Torsion Beam Suspension System Architecture Of A Certain Car

Research of this thesis is based on the development process of the rear torsion beam suspension which belongs to a car architecture platform.Based on the basic method of pre-suspension design and the multi-objective system optimization design method for vehicle performance decomposition technology,combined with the enterprise product development practice,that is the rear suspension development process and the target bandwidth requirements of the torsion beam structure performance design of the platform,using CAE technology,explore and study the development process of the back torsion beam suspension shared by an architecture platform.On the basis of ensuring the vehicle performance,it can realize optimization of the torsion beam structure,and propose an optimization design scheme of the rear suspension frame system of the chassis structure.In this process,the modularization of the torsion beam structure and the product performance difference are realized,and the low-cost strategy is shared with the platform,which highlights the competitive advantage of the whole vehicle in the market.Firstly,the design theory of the automobile architecture platform and the development process of the chassis architecture platform are introduced,and the relationship between the architecture of the rear suspension shelf system in the architecture is described in mathematical language.Through the modularization and integration design of parametric modeling technology,experimental design technology and multi-objective optimization algorithm in the current vehicle development,a pre-optimized design scheme is formed.Secondly,the CATIA is used to establish the torsion beam parametric model and the finite element model of the torsion beam assembly is generated.Through the empirical design judgment of the torsion beam assembly modal analysis results,the modal frequencies of all the stages meet the design requirements,and the accuracy verification of the flexible body part of the torsion beam assembly in ADAMS is completed.Based on this,the ADAMS rigid-elastic dynamic model of the torsion beam type rear suspension is constructed,and the accuracy of the rigid-elastic model is verified by K&C characteristic analysis and K&C test.It lays the foundation for the multi-objective optimization of the torsion beam suspension performance below.Finally,Isight is used to study multidisciplinary and multi-objective optimization of torsion beam suspension characteristics,which forms a multidisciplinary automation design optimization process.The optimization is mainly based on the cross-sectional dimensions of the torsion beam.Three-dimensional structure design,finite element,multi-body dynamics and optimization techniques are used to optimize the design of the cross-section shape and size of the torsion beam.Based on the beam thickness,section parameters,and the torsion beam suspension dynamics,the multi-objective optimization of the torsion beam suspension is carried out.The optimization results show that this method improves the performance of the torsion beam semi-independent suspension and can improve the performance of the vehicle.On the basis of this,shorten the development cycle,improve the development efficiency,and provide an effective forward design method for suspension design and development.