Study And Applications On Transient Field Of Heterogeneous Simulation System For Electromagnetic-Mechanical Coupling

As the size and complexity of products increases, it presents the characteristics of multi-field and strong coupling, the development of products becomes difficult, long cycle and high cost, it is unable to complete the design by single designer, the development of products has become a group work with multi-disciplinary and collaborate, especially the transient multi-field coupling problems, whose physical fields are strong coupled, and changing in the time domain. As the development of digital design techniques, there are a large number of excellent single, multi-disciplinary simulation tools, but most of them do not have the standard and openness, it is difficult to directly analyze this problem, so it is necessary to study the co-simulation technique of transient coupled field in heterogeneous simulation environment. In this paper, on the basis of analysis of digital product simulation technique, multi-field coupling analysis technique and co-simulation technology, some key simulation techniques of transient physical coupled field in heterogeneous simulation system were studied, they are: simulation model of transient physical coupled fields of heterogeneous simulation system, transient electromagnetic fields stepwise regression analysis technique of electromagnetic-mechanical coupling problem, the rigid-flexible coupled contact-impact model of flexible movement components of electromagnetic-mechanical coupling problem, and analysis technique of step self-adaptive sequential-interaction of transient coupled multi-field, and according to the engineering problem, simulated and analyzed some problems, the result shows that the simulation technique is effective.The organizational structure of the paper is as follow:In chapter 1, overviewed the study status of digital simulation technique, multi-field coupling analysis technique and co-simulation technique, analyzed and inducted related theory and technique, and pointed out the lack of current study of the simulation technique of transient coupled field in heterogeneous simulation system, given the paper's study content and organizational structure.In chapter 2, the simulation model of transient physical coupled fields of heterogeneous simulation system was proposed. The solution mechanism of transient physical field coupled problem and the steady-state physical coupled problem was studied, and the residual unbalanced load of the solution of transient physical field coupled problem, the critical step of every transient step was also be studied. At last, the information exchange mechanism, the simulaton mechanism, and the solution steps of transient physical coupled fields of heterogeneous simulation system were given, and the model was applied into the analysis of short-circuit trip delay analysis of low-voltage circuit breaker, and achieved the expected results.In chapter 3, transient electromagnetic fields stepwise regression analysis technique of electromagnetic-mechanical coupling problem was proposed. Minimum breaking unit and life cycle of minimum breaking unit was defined, the quasilinear mapping of breaking current and design variables was built by the Gaussian kernel function, and initial regressed on the design variables of minimum breaking unit by the partial least square regression method, and reversed the state variables according to the life cycle of minimum breaking unit by simulation. According to different periods of break, using different regression models to prived the source current, to solve the transient electromagnetic field distribution of MCCB. This technique was applied into the breaking simulation of a model of MCCB, and solved the problem successfully.In chapter 4, a rigid-flexible coupled contact-impact model of flexible movement components of electromagnetic-mechanical coupling problem was proposed. In order to take the interaction of vibration subsystem into account, the guide rail was took as flexible body, and every pair of guide roller and rail was took as the Dubowsky's contact model, to substitute the mass-spring-dashpot system in tradition model. The vibration equations of elevator car and guide rail was established, and the relations of variables such as displacement, velocity and excitation force between guide rollers and rails were given by satisfying the geometry compatibility and force equilibrium condition. The model was successfully applied into the horizontal vibration analysis of a model of high-speed elevator.In chapter 5, the analysis technique of step self-adaptive sequential-interaction of transient coupled multi-field was proposed. A three-points derivation equation was established based on interpolation polynomial of Lagrange by extracting the numerical solution of state variables of every iteration nodes, the rule for step adaptive was also established. According to the slope of the curve of coupling variables, the iteration steps can adjusted adaptively. For the problems that have more than one couple of coupling variables, the rule of date exchange and step adjustment of multi-state variables problem was established. This method was applied into the electromagnetic-dynamic interaction problem of low-voltage circuit breaker short-circuit breaking, and proved the feasibility of this method.In chapter 6, according to the engineering problem, the technique was applied into short-circuit breaking simulation of MCCB and horizontal vibration simulation of elevator, the results were analyzed and compared with the experimental results, the technique was proved correct and feasible in practice.In chapter 7, summarized the contents and results of the study, and prospected the further work.