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AssigneeSeoul National University Industry Foundation
InventorsYoon Young Kim, Seung Hyun Cho, Soon Woo Han, Chan Il Park
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Provided is a method and apparatus for generating and sensing torsional vibrations using magnetostriction, in order to perform modal testing on a bar, a pipe, a shaft, a beam, or the like. The apparatus includes a torsional vibration generating part transmitting torsional vibrations to a test part having an arbitrary cross-section and a predetermined length, and a torsional vibration sensing part sensing the torsional vibrations generated from the torsional vibration generating part. The torsional vibration generating part and/or the torsional vibration sensing part includes a magnetostrictive body attached around the test part and made of a magnetostriction material, a first magnetic field forming part forming a magnetic field around the test part in a circumferential direction of the magnetostrictive body, and a second magnetic field forming part forming a magnetic field to the magnetostrictive body in a direction substantially perpendicular to the direction of the magnetic field formed by the first magnetic field forming part and in parallel with a longitudinal direction of the test part.
An apparatus for generating and sensing torsional vibrations using magnetostriction, the apparatus comprising a torsional vibration generating part transmitting torsional vibrations to a test part having an arbitrary cross-section and a predetermined length, and a torsional vibration sensing part sensing the torsional vibrations generated from the torsional vibration generating part, wherein the torsional vibration generating part and/or the torsional vibration sensing part comprises:
A method of generating and sensing torsional vibrations using magnetostriction, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Making use of electrical energy: operating with magnetostriction
Measuring characteristics of vibrations in solids by using direct conduction to the detector: of torsional vibrations
By magnetic means, e.g. reluctance: using magnetostrictive devices
Methods or apparatus for generating or transmitting mechanical vibrations of infrasonic, sonic
About Less than a month of term left · ends 8 Nov 2026 (estimated)
This application claims the benefit of Korean Patent Application No. 10-2005-0111033, filed on Nov. 19, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
1. Field of the Invention
The present invention relates to an apparatus and method for generating and sensing torsional vibrations, which can perform torsional modal testing of a structure including shafts, beams and pipes, and more particularly, to an apparatus and method for generating and sensing torsional vibrations using magnetostriction, which can perform modal testing of a structure by subjecting a part to be tested to torsional vibrations using a magnetostrictive phenomenon and simultaneously sensing the torsional vibrations.
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
FIG. 1 is a view for explaining a magnetostrictive effect used in an apparatus for generating and sensing torsional vibrations according to an embodiment of the present invention;
FIG. 2 is a view showing a profile of a magnetostrictive body that is deformed by the magnetic field shown in FIG. 1;
The present invention will now be described in detail with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.
FIGS. 1 through 3 are views for explaining a magnetostrictive effect used in an apparatus and method for generating and sensing torsional vibrations according to an embodiment of the present invention.
As shown FIG. 1, when two perpendicular magnetic fields, i.e., a first magnetic field BS and a second magnetic field BD, are applied on a magnetostrictive body 1, the magnetostrictive body 1 may be deformed in a shear direction as shown in FIG. 2. That is, when the first magnetic field BS is kept constant, i.e., the intensity thereof is not changed, and the second dynamic magnetic field BD is changed, i.e., the intensity thereof is changed, the magnetostrictive body 1 is deformed according to the change of the second magnetic field BD, as shown in FIG. 2. That is, by changing the intensity and cycle of the second magnetic field BD, it is possible to control the deformation and cycle of the magnetostrictive body 1.