Research On Multi-Gradient Modeling And Solving Robustness Of Multi-Disciplinary Co-Simulation For Complex Product

The rational decomposition of product modules and the orderly construction of multi-disciplinary models are the key technologies in multi-disciplinary co-simulation modeling.The large number and the high heterogeneous complexity of multidisciplinary variables,the "black box" packaging models and the different solution mechanism between simulation tools,which can easily lead to low efficiency and the poor quality of co-simulation solution.In order to solve the existing problems of co-simulation modeling and solving,this paper proposes a multi-gradient modeling method for multi-disciplinary co-simulation of complex products,studies the solving robustness of multi-disciplinary co-simulation,and combined with engineering project analysis.The main structure of this paper is as follows:The first chapter reviews the multidisciplinary modeling methods of complex products,the hierarchical decomposition methods of product modules and the research status of the methods for solving robustness analysis at home and abroad,and gives the main contents of this paper and the full-paper organizational framework.The second chapter proposes a co-simulation multi-gradient modeling method considering multidisciplinary priority building sequence and sub-discipline model complexity analysis.The concept of multi-gradient modeling and the concrete implementation steps are given.Combined with product function requirements and model complexity,the product module is hierarchically decomposed.These improve the standardization of modeling and lay the modeling foundation for the co-simulation solving.The third chapter analyzes the co-simulation solving based on the Transmission Line Modeling and constructs a coupled Transmission Line Modeling considering the solver of simulation tools.This paper analyzes the data interaction coupling between subsystems and the numerical simulation process of the co-simulation from the establishment of the state space,the coupling integral algorithm and the co-simulation based on the communication interval.These provide theoretical support for the co-simulation solving robustness.The fourth chapter proposes the concept of co-simulation solving robustness and analysis the robustness mechanism from the perspective of numerical solution.For the co-simulation solving efficiency and the incompatibility of solving quality under the influence of multiple factors,a co-simulation robustness analysis method based on Collaborative Optimization method is proposed.The robustness analysis is carried out from system level,intermediate level and subject level respectively.The verification is carried out with examples.The fifth chapter combined with the project of "Tire Molding Machine Virtual Prototype"to build a co-simulation platform with Mechanical-Electric-Pneumatic-Control disciplines.Considering the functional requirements and the number of moving components,the tire molding machine is hierarchically decomposed.The multi-gradient modeling and the solution robustness analysis are performed by using the former template component which is decomposed,which achieves the efficient coordination of the project and provides a reliable method for project research and development.The sixth chapter summarizes the main research work of this paper,and points out the shortcomings and future research prospects.