The Characteristic Experiment Analysis of the Giant Magnetostrictive Actuator

Volume 6: 5th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C ◽

10.1115/detc2005-84164 ◽

2005 ◽

Author(s):

Huagang Sun ◽

Huiqun Yuan ◽

Bangchun Wen

Keyword(s):

Electric Current ◽

Coupling Coefficient ◽

Magnetostrictive Strain ◽

Multidimensional Interpolation ◽

Interpolation Curve ◽

Magnetostrictive Actuator ◽

Experiment Analysis

In this paper through the characteristic experiment of the giant magnetostrictive actuator, the relation between the magnetostrictive strain and the electric current under the different pre-stress is achieved. And the experiment formula between the maximal magnetostrictive strain and the pre-stress under the maximal electric current is founded. The optimal working pre-stress is established through the analysis to the data of the experiment. Then the characteristic of the magnetostrictive actuator under the optimal working pre-stress is discussed, and the experiment formula between the magnetostrictive strain and the electric current is founded. And, the 3-D interpolation curve of the magnetostrictive coefficient, pre-stress, and the electric current is achieved through the multidimensional interpolation. Last, magnetostrictive coupling coefficient is measured. Through the analysis of the experiment, some characteristics about the magnetostrictive strain, pre-stress, and the electric current have been established.

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The Design of Giant Magnetostrictive Flow Valve and its COMSOL Simulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.160-162.1146 ◽

2010 ◽

Vol 160-162 ◽

pp. 1146-1150 ◽

Cited By ~ 1

Author(s):

Pei Chen ◽

Quan Guo Lu ◽

Ding Fang Chen ◽

Kun Chen

Keyword(s):

Fast Response ◽

Flow Displacement ◽

Magnetostrictive Strain ◽

Valve Opening ◽

Magnetostrictive Actuator ◽

Comsol Simulation ◽

Displacement Model ◽

Large Flow ◽

Pilot Valve ◽

Flow Valve

By combining magnetostrictive actuator with flow valve directly, the flow was precisely controlled due to magnetic materials’ properties of fast response (less than 1μs)and large magnetostrictive strain (up to 1500ppm). The structure was designed based on this theory, and the flow - displacement model of valve was established by analyzing the size of the valve opening in different incentive current. The flow field was analyzed through multi-physics analysis software COMSOL. Simulation results showed that, the continuous adjustment and precision control were realized in a certain range of flow in the valve. Therefore, it could not only adjust the flow in micro amount directly, but also can be a pilot valve for high frequency precision large flow valve.

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Research on Dynamic Characteristic of Giant Magnetostrictive Actuator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.2880 ◽

2014 ◽

Vol 513-517 ◽

pp. 2880-2883

Author(s):

Li Yi Li ◽

Bai Ping Yan ◽

Cheng Ming Zhang

Keyword(s):

Resonant Frequency ◽

Dynamic Characteristic ◽

Equivalent Circuit ◽

Experimental Test ◽

Coupling Coefficient ◽

High Frequency ◽

Test Bench ◽

Output Force ◽

Magnetostrictive Actuator ◽

Experimental Test Bench

The emphasis of this paper is to research dynamic characteristic of giant magnetostrictive actuator (GMA). First, a prototype of GMA driving by a Φ5×40mm GMM rod (Terfenol-D) is made and the experimental test-bench is set, the optimal pre-pressure of GMA is 129N, and GMA can made 39.5μm strain with 218N output force under 5A current. Then, the energy of electrical, magnetic and mechanical of GMA is studied, equivalent circuit of energy conversion is summarized. At last, dynamic characteristic of GMA is measured, and hysteresis of strain under high frequency is tested. The results show that the resonant frequency of GMA is 1200Hz, and the magnetostriction coupling coefficient up to 0.572. The output strain of GMA increase with the frequency increasing before resonant frequency, and GMA has max output strain (49μm) under 1A current at 1200Hz.

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Implementation of Magnetostrictive Material Terfenol-D in CNG Fuel Injection Actuation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.630 ◽

2008 ◽

Vol 47-50 ◽

pp. 630-633 ◽

Cited By ~ 5

Author(s):

H.A. Chowdhury ◽

Saiful Amri Mazlan ◽

Abdul Ghani Olabi

Keyword(s):

Fuel Injection ◽

Response Times ◽

High Energy ◽

Fuel Injector ◽

Engine Emissions ◽

Magnetostrictive Strain ◽

Different Types ◽

Magnetostrictive Actuator ◽

Fast Control ◽

The Relationship

In applications broadly defined for actuation, magnetostrictive materials possess intrinsic rapid response times while providing small and accurate displacements and high-energy efficiency, which are some of the essential parameters for fast control of fuel injector valves for decreased engine emissions and lower fuel consumption. This paper investigates the application of Terfenol-D as a magnetostrictive actuator material for CNG fuel injection actuation. A prototype fuel injector assembly, including Terfenol-D as the core actuator material, was modeled in both Finite Element Method Magnetics (FEMM) and ANSYS Electromagnetics simulation softwares for 2D magnetics simulation. Preferably, FEMM was used in order to determine the coil-circuit parameters and the required flux density or applied magnetic field to achieve the desired magnetostrictive strain, consequently, the injector needle lift. The FEMM magnetic simulation was carried out with four different types of AWG coil wires and four different coil thicknesses of the entire injector assembly in order to evaluate the relationship between the different coil types and thicknesses against the achieved strain or injector lift. Eventually, the optimized parameters derived from FEMM were inserted into ANSYS Electromagnetics to compare the variation of results between these two simulation environments.

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Effect of Axial Grooves on Eddy Current Loss within Giant Magnetostrictive Material (GMM) Rod

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.574.615 ◽

2014 ◽

Vol 574 ◽

pp. 615-620

Author(s):

Chao Run Si ◽

Xian Jie Zhang ◽

Jun Biao Wang

Keyword(s):

Eddy Current ◽

Magnetic Field Intensity ◽

Thermal Power ◽

Groove Depth ◽

Eddy Current Loss ◽

Current Loss ◽

Giant Magnetostrictive Material ◽

Magnetostrictive Strain ◽

Magnetostrictive Actuator ◽

The Magnetic Field

The non-linear relationship between the magnetic field intensity and magnetostrictive strain which is caused by the thermal expansion produced by the eddy current loss in the GMM rod, will affect the precision and stability of GMM actuator. This paper tries to reduce the eddy current loss in the GMM rod to improve the performance of magnetostrictive actuator by machining radial grooves in the surface of the rod. The numerical results show that the axial grooves can be effective in reducing thermal power loss. The groove size and number are both optimized by numerical method. The results show that the groove depth and number has great impact on the unit volume eddy current loss while the groove width has little or no impact. The test of the magnetostrictive strain shows that the linearity of the GMM rod with grooves is significantly improved. The radial grooves in the GMM surface can reduce the eddy current loss and improve the performance of GMM actuator.

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