Research And Implementation Of Autobody Material Selection System Based On Material Database

As one of the most critical links in automobile production,material selection of autobody plays a decisive role in automobile performance,such as safety,handling stability,durability and so on.Due to the wide variety of body parts,complex structure and everchanging performance requirements,a complete and feasible body material selection scheme can be a huge boost in the production environment.In terms of alternative material evaluation attributes,attribute weighting methods,and material selection process,there are still some inadequacies in existing multi-attribute decision-making material selection schemes.Directed against these problems,a multiattribute decision-making material selection scheme based on the professional body material database that comprehensively considers the subjectivity of experience and physical objectivity is proposed.In addition,the body material selection system is developed,greatly improving the production efficiency of the material selection process.The specific research contents of this thesis are as follows:1.By analyzing the various factors that need to be considered in the selection of body materials in the actual production environment,the three types of material evaluation attributes of performance,formability,and cost are determined,and a linear normalization method of the material attribute evaluation value is given.In view of the subjective problems in the existing methods of evaluation value determination,the objective evaluation is used to obtain the initial evaluation value,and the expert scores revise it,combining the objective physical properties of the material with the actual engineering experience.2.The advantages and disadvantages of several commonly used weighting methods are clarified,and then,two weighting methods were selected based on the characteristics of this material selection problem: the subjective G1 method and the objective coefficient of variation method,whose calculation process is explained in detail.The weight results obtained using the above methods are used to aim at minimizing the deviation between the final weight vector and other weight vectors,and a comprehensive weighting method based on game theory is derived.3.Briefly introduce the autobody ring design concept and part naming rules,which is used for body part management in the material selection process.Then,based on the these data,the whole material selection process is explained: 1)preliminary screening in the three parent dimensions of performance,formability,and cost;2)the use of TOPSIS multiattribute decision algorithm to sort the material selection results considering user preferences.4.From the user’s perspective,considering the logic of the material selection process,the functional requirements of the material selection system are analyzed,the body material database is integrated with the material selection process,and each module of the material selection software is implemented.