Magnetostrictive devices

1983 ◽  
Vol 74 (3) ◽  
pp. 1099-1099
Author(s):  
Norman C. Koon
Keyword(s):  
Magnetostrictive Devices

Low Frequency Elastic Wave Diagnosis Method for Detecting the Internal Defects of Concrete Using Metal Magnetostrictive Devices

2004 ◽  
Vol 270-273 ◽  
pp. 1645-1652
Author(s):  
Shinichi Hattori ◽  
Toshiro Kamada ◽  
Takashi Shimada ◽  
Yasuhiro Takemura ◽  
Kanji Matsuhashi
Keyword(s):  
Elastic Wave ◽  
Low Frequency ◽  
Internal Defects ◽  
Diagnosis Method ◽  
Magnetostrictive Devices

Non-linear dynamics of the Villari effect in the presence of a non-homogeneous magnetic field

2018 ◽  
Vol 233 (4) ◽  
pp. 431-440
Author(s):  
Andrzej Rysak ◽  
Magdalena Gregorczyk
Keyword(s):  
Magnetic Field ◽  
Time Series ◽  
Hysteresis Loops ◽  
Bias Field ◽  
Homogeneous Magnetic Field ◽  
Operating Conditions ◽  
Bias Magnetic Field ◽  
Linear Dynamics ◽  
Non Linear ◽  
Magnetostrictive Devices

Investigations of systems with an active magnetostrictive element generally assume the presence of an external homogeneous bias magnetic field. This article, however, presents the results of a study investigating a bimorph magnetostrictive-aluminium beam vibrating in a non-homogeneous bias field. By comparing results obtained under different operating conditions of the system, the combined effect of the non-linear beam stress and the non-homogeneous external magnetic field on the dynamics of the Villari phenomenon is determined. The preliminary results prove that the application of non-linear magnetic fields to the magnetostrictive devices ensures the extension of energy harvesting bandwidth of these devices and can be used to improve their control possibilities. A study of time series and hysteresis loops provides more detailed information about the non-linear magnetization and dynamics of the system.

Magnetostrictive Devices

2016 ◽  
pp. 1-35 ◽  
Author(s):  
Marcelo J. Dapino ◽  
Zhangxiang Deng ◽  
Frederick T. Calkins ◽  
Alison B. Flatau
Keyword(s):  
Magnetostrictive Devices

Development of Smart Material-Hydraulic Pumps and Actuators

Aerospace ◽  
2006 ◽  
Author(s):  
Ryan C. Sneed ◽  
Roland R. Smith ◽  
Michael F. Cash ◽  
Gregory L. Bales ◽  
Eric H. Anderson
Keyword(s):  
Smart Materials ◽  
Smart Material ◽  
Hydraulic Systems ◽  
Electromagnetic Actuators ◽  
Higher Power ◽  
Pump Stage ◽  
Material Power ◽  
Power Densities ◽  
Design And Testing ◽  
Magnetostrictive Devices

Smart materials such as piezoelectrics and magnetostrictives produce mechanical power in a form that is improperly matched to many applications. When packaged in typical ways, these stiff materials have excess force but are deficient in displacement. Recent research has suggested that smart materials can be used for the pressurization and pump stage in electrohydrostatic actuators (EHAs). EHAs offer advantages over traditional centralized hydraulic systems by providing local pressurization in a closed fluid system and eliminating the need for distributed, high-pressure fluid lines. Given inherent material power densities, smart material-based EHAs could produce higher power output compared to electromagnetic actuators. High frequency, low displacement smart material actuation, typically operated in the range of 500 Hz, but in some cases much higher, is rectified via fluid flow to produce larger output displacements at lower frequencies. Valve limitations, mechanical compliances, and fluid compressibility account for significant losses in the pumps. Continuing previous research, this paper describes design approaches that address and attempt to minimize losses. Piezoelectric and magnetostrictive devices are compared, and the design and testing of magnetostrictive pumps is described in greater detail, with special considerations given to heat generation and improved efficiency.

Power Harvesting Through Magnetostrictive Devices: A Linear Model

2010 ◽  
Author(s):  
Francesco Braghin ◽  
Simone Cinquemani ◽  
Ferruccio Resta
Keyword(s):  
Energy Harvesting ◽  
Electrical Power ◽  
Mechanical Vibration ◽  
Experimental Tests ◽  
Electrical Energy ◽  
Uniaxial Stress ◽  
Coupling Model ◽  
Magnetostrictive Material ◽  
Magnetostrictive Devices ◽  
Villari Effect

Energy harvesting, sometimes referred to as “power scavenging” or “energy extraction”, can be defined as “converting ambient energies such as vibration, temperature, light, RF energy, etc. to usable electrical energy by using energy conversion materials or structures, and subsequent storage of the electrical energy for powering electric devices”. There has been a significant increase in the research on vibration-based energy harvesting in recent years. In this contest magnetostrictive devices are considered a promising technology. The Villari effect, also known as the inverse magnetomechanical effect, is the change in magnetization that a magnetostrictive material undergoes when subjected to an applied uniaxial stress. This effect pertains to the transduction of energy from the elastic to the magnetic state and is inverse of Joule magnetostriction. Furthermore, the Villari effect exhibits many of the attributes of the direct magnetostrictive effect since its physical origin lies in magnetoelastic coupling. Transducers utilizing the Villari effect consist of a coil wound on a core of magnetostrictive material. In this paper, a linear magnetomechanical coupling model is developed to analytically calculate the potential electrical power such transducers can generate when subjected to applied harmonic mechanical vibration. Theoretical results are confirmed by experimental tests on two different magnetostrictive devices.

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