Piezo-electric intelligent structure closed-loop system simulation method based on finite element and system identification

A technology of intelligent structure and system identification, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as inability to reflect the coupling of dynamical systems and control systems

Inactive Publication Date: 2005-06-01
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

This simulation method overcomes the shortcomings of the high order of the finite element model. However, it can be seen that in this method, the dynamic modeling and control system design of the piezoelectric smart structure are carried out independently, and the closed-loop system based on the reduced-order model Simulation cannot reflect the coupling effect of dynamic system and control system

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  • Piezo-electric intelligent structure closed-loop system simulation method based on finite element and system identification
  • Piezo-electric intelligent structure closed-loop system simulation method based on finite element and system identification
  • Piezo-electric intelligent structure closed-loop system simulation method based on finite element and system identification

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Embodiment Construction

[0026] The principle of the invention is as figure 1 As shown, F in the figure e , v a and v v They are external disturbance, control voltage and sensor signal respectively. First, the finite element method is used to calculate the response of the structure under band-limited white noise excitation. Based on the input and output time histories, the system identification method is used to obtain the state-space model of the minimum realization of the piezoelectric intelligent structure, and then the low-order state-space model is designed based on this In order to meet the functional requirements of the intelligent structure, the LQG controller takes the response of the node at the sensor position as the sensor signal, defines the sensor signal as an APDL variable, uses the APDL language to realize the feedback controller, and uses the finite element method to calculate the external excitation of the intelligent structure. After a certain time step response under the action ...

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Abstract

The intelligent closed piezoelectric structure system simulating method based on finite elements and system distinction includes giving system I/O time course via finite element analysis to replace experiment data based on the finite element model of intelligent piezoelectric structure, treating the I/O time course in system distinction method based on observer/Kalman filter to obtain the system Markov parameter, then obtaining the system minimal realization vian eRAn algorithm, designing the feedback controller based on the model, and finally introducing the feedback controller into finite element model in APDL language of ANSYS to realize intelligent closed piezoelectric structure system simulation based on finite element method. The method reflects the coupling effect between dynamic system and control system, and can introduce various output feedback and state feedback controller into finite element model for performance comparison of various kinds of controllers.

Description

technical field [0001] The invention relates to a simulation method for a closed-loop system of a piezoelectric intelligent structure, in particular to a simulation method for a closed-loop system of a piezoelectric intelligent structure based on finite elements and system identification, and belongs to the field of mechanical engineering. Background technique [0002] Piezoelectric materials are widely used in smart structures and active vibration control due to their good electromechanical coupling properties. In the simulation problem of closed-loop system of piezoelectric intelligent structure, dynamic modeling and controller design are two important links. The finite element method is an effective means to establish the dynamic model of the piezoelectric intelligent structure, but the order of the finite element model is very high and cannot be used for controller design. [0003] Through literature search to the prior art, it is found that "Finite element analysis and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/00G05B13/04
Inventor 董兴建孟光
Owner SHANGHAI JIAO TONG UNIV
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