GMA adaptive control method and device based on fiber grating

Abstract

The invention discloses a fiber grating-based GMA self-adaptive control method and device, which uses a fiber grating sensor to collect in real time the mechanical coupling state information of multiple physical fields in the GMA actuation process, and obtains the feedback characteristic information of each component of the GMA and external excitation Based on this, an online nonlinear dynamic model of the GMA working process is established; and then by analyzing the difference between the expected and actual feedback characteristics, the model adaptive servo control strategy between the excitation and the feedback is studied, and the optimal one that meets the application requirements is designed. adaptive control method. The control of the GMA can be adjusted according to the change of the environmental working condition, and the precision of the GMA control can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of fiber grating-based sensing, in particular to a fiber grating-based GMA adaptive control method and device. Background technique [0002] In recent years, with the continuous improvement of performance requirements such as precise positioning and precise displacement of manufacturing equipment in the fields of aerospace, microelectronics, ultra-precision machining, modern bioengineering, and optical microprocessing, traditional materials have been unable to meet the requirements. The giant magnetostrictive actuator (GMA) has the advantages of high power, high energy conversion efficiency, high driving precision, and fast response speed, and has attracted more and more attention. [0003] In developed countries in Europe and the United States, high-precision micro-actuation using giant magnetostrictive materials has been widely used. The nonlinear characteristics, principles and related theories of the mic...

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Problems solved by technology

[0004] The current quantitative description of the GMM constitutive nonlinear relationship and the nonlinear characteristics of the micro-actuated structure coupled with the GMA multi-physics field mainly has the following deficiencies: (1) The existing theoretical modeling of the GMM constitutive relationship is either for the ideal state Under the multi-field coupling behavior, or for the hysteresis behavior of materials under quasi-static driving, constitutive models that can truly and effectively simulate the nonlinear characteristics of GMM multi-field coupling are relatively scarce

(2) For the GMA system with the GMM rod as the core driving element, there is no coupling theoretical framework that considers the principle of GMM rod composite action and the nonlinear time-varying modeling of the micro-actuation structure under the coupling condition of multi-physics factors at the same time.

(3) For the theoretical research on the coupling effects of magneto-elastic-thermal multi-physics factors, most of the existing research is carried out in the simulation environment with ideal assumptions, and lacks the characteristics of the GMA multi-physics factors under real working conditions, Research on Coupling Mechanism and Dynamic Nonlinear Characteristics

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