The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 2009
Filed:
May. 31, 2006
Yoon Young Kim, Seoul, KR;
Seung Hyun Cho, Ansan, KR;
Soon Woo Han, Seoul, KR;
Chan IL Park, Gunpo, KR;
Yoon Young Kim, Seoul, KR;
Seung Hyun Cho, Ansan, KR;
Soon Woo Han, Seoul, KR;
Chan Il Park, Gunpo, KR;
Seoul National University Industry Foundation, Seoul, KR;
Abstract
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.