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Journal ArticleDOI

Research on giant magnetostrictive micro-displacement actuator with self-adaptive control algorithm

01 Jan 2005-Vol. 13, Iss: 1, pp 446-449
TL;DR: In this paper, the output strain of a giant magnetostrictive micro-displacement actuator is used for feedback to control system, and the control system adopted self-adaptive control algorithm, the ideal input and output model of actuator was used for a reference model and a hysteresis transfer function for the actuator real model.
Abstract: Giant magnetostrictive micro-displacement actuator has some unique characteristics, such as big output torque and high precision localization which can be in the nanometer scale. Because the relation between input magnetic field and output strain of giant magnetostrictive micro-displacement actuator exhibits hysteresis and eddy flow, the actuator has to be controlled and used in low input frequency mode or in static mode. When the actuator is controlled with a high input frequency (above 100 Hz), the output strain will exhibit strong nonlinearity. This paper found hysteresis and nonlinearity dynamic transfer function of the actuator based on Jiles-Atherton hysteresis model. The output strain of Jiles-Atherton hystersis model can reflect real output of actuator corresponding to the real input magnetic field, and this has been verified by experiment. Against the nonlinearity generated by hysteresis and eddy flow in this paper, the output strain of actuator is used for feedback to control system, and the control system adopted self-adaptive control algorithm, the ideal input and output model of actuator is used for a reference model and a hysteresis transfer function for the actuator real model. Through experiment, it has been verified that this algorithm can improve the dynamic frequency of the giant magnetostrictive micro-displacement actuator and guarantee high precision localization and linearity between the input magnetic field and output strain of the actuator at the same time.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a nonlinear constitutive model of a giant magnetostrictive actuator is put forward for the application of effectively suppressing vibration, which is established not only by combining linear constitutive equations with the Bouc-Wen equations but also by using Hamilton's principle and the assumed mode method to analyze the hysteresis phenomena and quadric frequency property.
Abstract: Giant magnetostrictive actuators (GMA) used in vibration control and high precision positioning control have been studied widely in last decade. Recently, although many researchers commit themselves to modeling giant magnetostrictive actuators, there is still lack of simplified model of analyzing nonlinear properties to deal with the problems on active vibration control with giant magnetostrictive actuators. In this paper, a nonlinear constitutive model of a giant magnetostrictive actuator is put forward for the application of effectively suppressing vibration. The nonlinear constitutive model is established not only by combining linear constitutive equations with the Bouc–Wen equations but also by using Hamilton's principle and the assumed mode method to analyze the hysteresis phenomena and quadric frequency property in the giant magnetostrictive actuator. In addition, a minimum variance self-turning regulator (MVSTR) is incorporated into the design of a controller, which may be used in suppressing low frequency (≤5 Hz) and micron-level (≤5 μm) disturbances. In the end of this paper, some simulations are performed in LABVIEW and experimental control tests are implemented using a giant magnetostrictive actuator prototype. Both the numerical simulations and experimental tests results show that the amplitudes of disturbances may be reduced up to no less than 90% averagely in the whole sampling processes. This proves that the giant magnetostrictive actuator has not only the capacity of controlling low-frequency and micro-level vibration but also the notable effectiveness of active control by the adaptive regulator. Moreover, the minimum variance self-tuning regulator is testified as a feasible controller for vibration control in the paper.

40 citations

Journal ArticleDOI
TL;DR: The design principle of structural parameters is obtained by studying stability of GMA, which provides theoretical basis and technical support for the structural stability design.
Abstract: The multi-coupled nonlinear factors existing in the giant magnetostrictive actuator (GMA) have a serious impact on its output characteristics. If the structural parameters are not properly designed, it is easy to fall into the nonlinear instability, which has seriously hindered its application in many important fields. The electric–magnetic-machine coupled dynamic mathematical model for GMA is established according to J-A dynamic hysteresis model, ampere circuit law, nonlinear quadratic domain model and structure dynamics equation. Nonlinear dynamic analysis method is applied to study the nonlinear dynamic behaviour of the key structure parameters to reveal their influence on the system stability. The design principle of structural parameters is obtained by studying stability of GMA, which provides theoretical basis and technical support for the structural stability design.

19 citations


Cites methods from "Research on giant magnetostrictive ..."

  • ...James, Lei Wang, William S andMao Jianqin applied robust control [7], self-adaptive control algorithm [8], optimal control [9] and H∞ control [10] to reduce the influence of nonlinear factors and improve the tracking accuracy and stability of GMA....

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Journal ArticleDOI
TL;DR: The experiment results indicate that Lyapunov direct method that is integrated into inverse model feed-forward compensation fuzzy PD controller can effectively improve the dynamic output features especially in the complex dynamic environment, and reduce the root mean square error.
Abstract: The output characteristics of giant magnetostrictive actuator (GMA) are affected by many nonlinear factors, such as hysteresis, load, driving frequency and so on, which would lead to lower positioning precision, poorer repeatability, and even fall into nonlinear instability especially in complex dynamic environment. First, the accurate dynamic mathematical model for GMA is established after analyzing its working principle. Then, the inverse model feed-forward compensation fuzzy PD control based on Lyapunov stability is put forward and applied into the GMA control system. The experiment results indicate that Lyapunov direct method that is integrated into inverse model feed-forward compensation fuzzy PD controller can effectively improve the dynamic output features especially in the complex dynamic environment, reduce the root mean square error from 1.275 to 0.332 and maximum error rate from 26.89% to 7.12%, which not only greatly improve performance and expand the application domain of GMA, but also have very important theoretical significance and high application value in modeling and control approach for some hysteresis systems.

8 citations


Cites background from "Research on giant magnetostrictive ..."

  • ...With the development of intelligent control strategies, adaptive control [9], neural network control [10], optimal control [11], [12] are studied to improve the tracking characteristics by constantly adjusting control parameters....

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Patent
23 Mar 2016
TL;DR: In this paper, a Monte Carlo technique based geometrical tolerance distribution method for large high-speed rotary equipment is presented, which consists of analyzing a propagation process of positioning and orientation tolerances of radial and axial measurement planes.
Abstract: The present invention provides a Monte Carlo technique based geometrical tolerance distribution method for large high-speed rotary equipment, and belongs to mechanical tolerance distribution technology. The method comprises: analyzing a propagation process of positioning and orientation tolerances of radial and axial measurement planes of large high-speed rotary equipment; determining a propagation relationship of center coordinates after n-level equipment assembly; obtaining relationships between equipment eccentricity and positioning and orientation tolerances and rotation angles of rotors of each level after the assembly; creating radial eccentricity and axial perpendicularity data of the large high-speed rotary equipment of each level according to a Monte Carlo method; drawing a distribution function to solve a probability density function; and obtaining a probability relationship between radial eccentricity and an axial perpendicularity tolerance of the large high-speed rotary equipment of each level and a final coaxiality tolerance of the multi-level equipment, thereby implementing tolerance distribution of the large high-speed rotary equipment.

5 citations

Patent
23 Mar 2016
TL;DR: In this paper, a probability density technology based geometrical tolerance distribution method for large high-speed rotary equipment, and belongs to mechanical tolerance distribution technology, is presented. And the method comprises: analyzing a propagation process of positioning and orientation tolerances of radial and axial measurement planes of large high speed rotary devices, determining a propagation relationship of center coordinates after n-level equipment assembly, obtaining relationships between equipment eccentricity and positioning and orientations tolerances and rotation angles of equipment of each level after the assembly; obtaining probability density of a coaxiality tolerance of the n-
Abstract: The present invention provides a probability density technology based geometrical tolerance distribution method for large high-speed rotary equipment, and belongs to mechanical tolerance distribution technology The method comprises: analyzing a propagation process of positioning and orientation tolerances of radial and axial measurement planes of large high-speed rotary equipment; determining a propagation relationship of center coordinates after n-level equipment assembly; obtaining relationships between equipment eccentricity and positioning and orientation tolerances and rotation angles of equipment of each level after the assembly; obtaining probability density of a coaxiality tolerance of the n-level equipment according to a target function of the coaxiality tolerance; and finally, obtaining a probability relationship between radial eccentricity and an axial perpendicularity tolerance of the large high-speed rotary equipment of each level and a final coaxiality tolerance of the multi-level equipment, thereby implementing tolerance distribution of the large high-speed rotary equipment

4 citations

References
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Book ChapterDOI
TL;DR: In this article, a general treatment of magnetostriction for the cases of hexagonal and cubic symmetry is described, which is applicable to the rare earth elements and rare earth-iron compounds and the role of intrinsic as well as extrinsic effects.
Abstract: Publisher Summary This chapter provides an overview of the magnetoelastic properties of the highly magnetostrictive rare earth-Fe2 alloys. The chapter describes a general treatment of magnetostriction for the cases of hexagonal and cubic symmetry, which is applicable to the rare earth elements and the rare earth-iron compounds. The chapter presents the magnetostriction of binary rare earth-iron alloys and the magnetostriction of single crystal and polycrystal RFe2 compounds are compared to other magnetostrictive materials at room temperature. The chapter discusses a possible source of startling magnetostriction anisotropy, measurements of magnetization, sublattice magnetization, and magnetic anisotropy, and the role of intrinsic as well as extrinsic effects. It reports the effects of the strong magnetoelastic coupling on sound velocities and elastic moduli and observes extraordinarily large ∆E effects and changes in sound velocity in single crystals, polycrystals, and amorphous rare earth-Fe2 alloys. The chapter concludes with a discussion of the recent measurements of linear and volume magnetostriction on the amorphous form of the RFe2 alloys.

319 citations

Journal ArticleDOI
TL;DR: In this article, the Jiles-Atherton mean field model for ferromagnetic hysteresis is combined with a quadratic moment rotation model for magnetostriction.
Abstract: This paper addresses the modeling of hysteresis in magnetostrictive transducers in the context of control applications that require an accurate characterization of the relation between input currents and strains output by the transducer. This relation typically exhibits significant nonlinearities and hysteresis because of inherent properties of magnetostrictive materials. The characterization considered here is based on the Jiles-Atherton mean field model for ferromagnetic hysteresis in combination with a quadratic moment rotation model for magnetostriction. As demonstrated by comparison with experimental data, the magnetization model very adequately quantifies both major and minor loops under various operating conditions. The combined model can then be used to accurately characterize output strains at moderate drive levels. The advantages of this model lie in the small number (six) of required parameters and its flexibility under a variety of operating conditions.

203 citations

Proceedings ArticleDOI
06 Jun 1997
TL;DR: In this paper, an experimental investigation of the effect of prestress on the dynamic performance of a Terfenol-D transducer is presented, and the effects of both prestress and magnetic bias on the near dc transducers performance are also presented.
Abstract: The performance of magnetostrictive Terfenol-D is highly dependent on the state of the material and in particular on the mechanical prestress. This paper presents an experimental investigation of the effect of prestress on the dynamic performance of a Terfenol-D transducer. The effects of both prestress and magnetic bias on the near dc transducer performance are also presented. Experimental results demonstrate the sensitivity of the transducer performance in terms of strain, strain rate with applied field, and material properties to relatively small changes in initial mechanical prestress. Trends in material properties, Young's Modulus, magnetomechanical coupling factor, permeability, dynamic strain coefficient, and mechanical quality factor with prestress and drive level are developed. In addition, the effect of magnetic bias and frequency of operation on the strain at different applied fields are examined and shown to significantly influence transducer output at a given prestress level. For the transducer as operated in this study, including the appropriate magnetic bias, both the magnetomechanical coupling and the strain coefficient are optimized with a prestress of 1.0 to 1.25 ksi.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

67 citations

Proceedings ArticleDOI
06 Jun 1997
TL;DR: In this paper, two characterizations for modeling hysteresis and material nonlinearities in magnetostrictive materials are presented. And the two approaches are illustrated in the context of an Euler- Bernoulli beam model which incorporates magnetostrategies.
Abstract: Techniques for modeling hysteresis and material nonlinearities in magnetostrictive materials are presented. Hysteresis in these materials is due to both the driving magnetic field and stress relations within the material and is significant throughout most of the drive range of the material. Two characterizations are presented here. The first model is posed in terms of Preisach operators and is purely phenomenological in nature. The second model is physics-based with parameters related to measurable properties of the input magnetic field. The two approaches are illustrated in the context of an Euler- Bernoulli beam model which incorporates magnetostrictive actuators.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

30 citations