Research On The Theory, Method And Application Of Multi-Performance Coupled Analysis And Simulation Of Digital Mock-up Of Complex Products

Modern complex product commonly includes multidisciplinary knowledge, which performance mainly is embodied by the changes of mechanical field (motion track), displacement field (stress and strain), thermal field, electromagnetic field and fluent field. The integration of multi-physics field is more and more important in the analytical technology of product performance. Now it becomes the hot issue in the research of engineering domain. On the other hand, the customer's requirement of product is increasing continually, which is interrelated to the function, performance, specification and variety of complex product. It is a desiderate problem that how to use the customize design technique to develop a product which meets the customer's requirement and the performance is eligible. This paper researches the theory and method of multi-performance coupling and simulation of digital mock-up of complex product. A digital mock-up simulation prototype system is developed. The theory and method suggested have been successfully applied to some research projects, good results have been achieved.Chapter one first summarizes the key enabled techniques for multi-performance coupling and simulation of digital mock-up of complex product, and then introduces the actuality of the research and application of it. The existent problem is discussed. The research's significance and the contents are presented.Chapter two introduces the methodology of customize design to the multi-performance and fuzzy customer's requirement of product. According to the diversity and fuzzy of customer's requirement, the fuzzy requirement is represent by structural mode. The mapping relationship between customer's requirement to technical parameters and technical parameters to design parameters are set up. Then the customize design parameters table can be founded quickly to meet the customer's requirement primarily. It is used to configure the product and prepared to the performance simulation of virtual prototype of product.Chapter three gives a methodology of component modeling and reuse to the multi-performance simulation of digital mock-up. According to the customize design parameters, a simulation component modeling is used to build the virtual prototype of product quickly. Based on this method, the design parameters and technical parameters are mapped to an bidirectional driven mode, so that the reusability of simulation model is improved.Chapter four carries out the research of high fidelity force feedback in the simulation of interaction of human-machine in virtual prototyping. The dynamic behavior of product is analyzed beforehand. Then a quickly and imprecise feedback force is fitted. According to the coupling and synchronization of multi-rate serve loops, the dynamical distribution of computer resource and the optimization of integral step of dynamic solution, the stability, real-time and accuracy of force feedback in the dynamic simulation of virtual prototyping with haptic interaction is strongly improved.Chapter five researches the visualization of simulation of multi-physics field with the coupled of heterogeneous finite element mesh. The topological information is extracted from the meshes. According to the information, a transitional mesh is built. The nodes of each heterogeneous mesh are coupled and mapped by the coordinates of each other. Then, the geometry model of transitional mesh is rendered in virtual environment and the mapping of physical attributes of nodes to geometry points is set up..Chapter six develops the prototype system for digital mock-up multi-Performance coupling and simulation platform and applies it into the practical product design. Several products as the application examples are experimented on the platform.Chapter seven summarizes the research results of this paper, and gives the way for further research.