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. 05, 1989
Filed:
Mar. 28, 1988
Yasuomi Yagi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A shaft torsional vibration monitor for a poly phase turbine generator and its prime mover turbine connected thereto comprises an electrical torque detector detecting electromagnetic torque applied to the turbine generator rotor, a memory unit capable of storing plurality sets of torque variation data due to system disturbances each having an initial torque variation rate more than a predetermined amount, a first processor fetching the sets of torque variation data one by one from the memory unit and determining the corresponding shaft torsional vibration and a second processor determining fatigue and life expectancy of the rotary shaft system for the turbine generator and its turbine by accumulating torsional stresses caused by respective shaft torsional vibrations.