scholarly journals Examination of the Shape Variation and Stress Distribution of Vibration Elements Using Giant Magnetostrictive Material.

1994 ◽  
Vol 18 (2) ◽  
pp. 481-484
Author(s):  
H. Wakiwaka ◽  
T. Umezawa ◽  
K. Kuwahara ◽  
H. Kamata ◽  
T. Yoshikawa
Keyword(s):  
Stress Distribution ◽  
Shape Variation ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material

scholarly journals Development of a Direct-Drive Servovalve Using a Giant Magnetostrictive Material.

1993 ◽  
Vol 59 (563) ◽  
pp. 2112-2115
Author(s):  
Takahiro Urai ◽  
Takahiro Sugiyama ◽  
Takashi Nakamura ◽  
Katsuhisa Jinbo
Keyword(s):  
Direct Drive ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material

Intervertebral Disc Shape Variation and its Relationship to Degeneration Using Principal Components Analysis of a Population of MR Images

2012 ◽  
Author(s):  
John M. Peloquin ◽  
Jonathon H. Yoder ◽  
Nathan T. Jacobs ◽  
Sung M. Moon ◽  
Alexander C. Wright ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Intervertebral Disc ◽  
Material Properties ◽  
Three Dimensional ◽  
Low Back ◽  
Shape Variation ◽  
Mr Images ◽  
Physiological Basis ◽  
Prevalent Disease ◽  
Components Analysis

Degeneration of the intervertebral disc (IVD) is implicated in low back pain, which is a costly and prevalent disease. Since the IVD is a mechanically active organ, it is important to consider its mechanical behavior as one factor in the degenerate pathology. Strain can be measured directly by imaging methods, but the stress distribution within the disc must be calculated. The stress distribution for a particular strain state is dependent on the IVD’s material properties and its geometry. While the material properties of the tissues comprising IVD have been extensively studied, its three-dimensional geometry remains incompletely characterized. Prior whole-disc models have been constructed from single IVDs. While this approach ensures that the geometry has a physiological basis, it is uncertain the degree to which results from a single IVD shape can be generalized to the entire population.

scholarly journals Effect of Magnetic Bias on Acoustic Vibration Element Using Giant Magnetostrictive Material.

1992 ◽  
Vol 16 (2) ◽  
pp. 389-392 ◽  
Author(s):  
H. Wakiwaka ◽  
M. Nagumo ◽  
M. Iio ◽  
H. Yamada ◽  
M. Igarashi ◽  
...  
Keyword(s):  
Acoustic Vibration ◽  
Magnetic Bias ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material

Modal FEM Analysis Using Weak Form Equations for a Microgyroscope with Bulk Giant Magnetostrictive Material (GMM) Resonator

2013 ◽  
Vol 650 ◽  
pp. 513-517
Author(s):  
Lei Yang ◽  
Feng Cui ◽  
Wu Liu ◽  
Xiao Sheng Wu ◽  
Wei Ping Zhang ◽  
...  
Keyword(s):  
Electromechanical Coupling ◽  
Fem Analysis ◽  
Weak Form ◽  
Response Analysis ◽  
Governing Equations ◽  
Third Order ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material ◽  
Harmonic Response Analysis ◽  
Important Basis

The structure and operation principle of a novel solid MEMS gyroscope with bulk giant magnetostrictive material (GMM) resonator are presented. A finite element method (FEM) for modal analysis of the GMM resonator is employed in which the fundamental magnetoelastic governing equations of the GMM are solved numerically using weak form equations of COMSOL Multiphysics. For a bulk GMM with size of 4×4×4 mm3, it is found that the third order vibration mode with frequency of 182 kHz meets working vibratory mode of the gyro sensor, which is verified by harmonic response analysis. Compared with analogy method which simulates the GMM as piezoceramics, this method is more practically reflect the operation state of GMM resonator of the microgyro due to consideration of Maxwell force in the weak form equations. This paper provides important basis for further full magnetic electromechanical coupling analysis of the microgyroscope.

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