Research On Structure And Performance Optimization Design For Front End Module Of MPV

With the continuous development of the automotive industry,energy crisis and environmental pollution problems are also increasing.The lightweight of the automobile has become one of the most effective means to solve the problems of "energy saving","safety" and "environmental protection".Domestic and foreign governments,automobile enterprises have carried out research on the vehicle lightweight technology as a response to oil shortage and environmental pollution,so the study of automotive lightweight technology is very meaningful.Plastic front end module technology is a "Plastic instead of steel" typical representative of lightweight technology,which both lightweight and modular technology advantages in the automotive industry has a broad space for development and application prospects,so optimization technology research for the front end module is also very urgent.In this paper,the key optimization technology of the structure of the plastic front end module is studied.Taking the development of the new plastic front end module of the car as an example,the topology optimization design method of the front end module structure in the conceptual design stage is studied systematically,which provides sufficient basis for the early structure lightweight design.At the same time,it also focuses on the multi-disciplinary optimization design method of the front end module weight and performance in the detailed design stage.The parallel design of the front module weight and performance is realized effectively,which provides a feasible scheme for structural design.First of all,for the concept design stage of the front end module structure topology design,the best material distribution and structural form is basis to achieve the weight minimization design.In this paper,based on the packaging requirements of front end module and the boundary constraint,the reasonable optimization space of the front end module is determined.Based on the working condition of the front end module,the topology optimization load condition is identified,and then the topology optimization algorithm based on single-load case and multi-load case are built,and the best material distribution and load path are obtained,which provides the basis for the subsequent structural design.Then,for the detailed design stage of the front end module weight and performance design,need to determine a reasonable and accurate structure size to achieve the minimum weight and performance design.Based on the initial structure thickness design of the front end module,a detailed finite element model of NVH,strength and stiffness analysis of the front-end module is established and the performance evaluatio n is carried out.Then,the thickness of the different structure of the front end module is optimized,and the weight is the system target,and the performance target is the subsystem constraint,the mathematical model of the multidisciplinary optimization design of the front end module is constructed,and the synchronous design of the front end module performance and weight is realized.Finally,the validity of the topology optimization design and the multidisciplinary optimization design of the front end module are verified by experiments.