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:
Sep. 18, 1990
Filed:
Sep. 11, 1989
Jacob Tellerman, Bayside, NY (US);
MTS Systems Corporation, Eden Prairie, MN (US);
Abstract
A damping device for damping mechanical vibrations in a small diameter elongated member, such as a waveguide carrying torsional strain waves, includes a damping material contained inside a housing on the waveguide, the damping material is a viscous liquid that does not evaporate or change viscosity over a wide temperature range and which has additives for providing adequate mass density for damping vibrations in such elongated member. The use of a viscous liquid and additives for changing the mass density permits varying the mass density to match impedances and reduce the amplitudes of any reflective waves. The viscous liquid preferably comprises a silicone base oil partially filled with zinc oxide and metal particles to give the characteristic of stable viscosity across a wide range of temperature and provide the necessary attenuation while obtaining good coupling of the damping material to the elongated member.