The Simulation And Experimental Research Of The Vibration Control System Basedon Model Updating

Because of that many complex dynamic characteristics are highlighted by cantilever beam and rotor under the control condition, so taking cantilever beam or rotor active vibration control system as research object, in order to analysis the coupling effects of control, electromagnetic and structure. The research of the dynamic characteristics of the cantilever beamand the coupling effect of structure and control under the control condition is very significance for the integration modeling and simulation of mechatronics.For magnetic parts, mechanical structure and dynamic coupling effect of control parameters and structural,do some analysisin this text: First, when it comes to the electromagnetic force of electromagnetic actuator, theoretical calculation method, finite element calculation method and test method are used in this paper. Besides, the analysis result of electromagnetic force is used successfully in joint simulation based on virtual technology.Second, for the study of dynamic characteristics of the cantilever beam under the control condition based on PID controller, model updating technology is used to establish the accurate model of the mechanical structure department of cantilever beam firstly. Then, use Bush elements to simulate the electromagnetic actuator. Establish the mathematical relation of Bush elements’ nonlinear stiffness and modal frequency of model by writing MATLAB program to calling the Nastran to calculate the finite element model. On the other hand, make the modal experiment to get the dynamic characteristics of cantilever beam under the control condition. At last, according to the experiment data, correct the nonlinear law of Bush elements. Thinking of the coupling effects of control parameters and cantilever beam structure, build the mapping relation of large proportion control link’s resistance parameter of PID controller, supporting stiffness and model’s modal frequencies. Combining the mapping relation with model validation method, using P-Box’s probability boundary method and normal distribution method, do analysis of forward and reverse transmission of the uncertainties of control parameters, installation structure uncertainty and uncertainty of modal parameter identification.In the process of dynamics analysis of the cantilever beam under controlling condition, encountering the problem that damping parameter is difficult to identify, the method that combining time-domain signal with model correction technology is put forward. Use singular value decomposition technique to get the signal characteristics, and build up the response surface based on the characteristics.Through the response surface,update the parameters of the modal and get the accurate model. At last, carry out the method in the modeling of rotor-AMB(active magnetic bearing) system and obtains good effect.