Title:
MONITOR FOR STEAM TURBINE
Document Type and Number:
Japanese Patent JPS5859302
Kind Code:
A
Abstract:
PURPOSE:To detect the abnormal vibration of a turbine shaft and to enable an alarm to be produced for informing of cracks by a method wherein a rotary synchronizing vibration and a rotary synchronizing double vibraion component are extracted from the vibration of the turbine shaft and compared to each other, and the compared value is further compared with a total amplitude. CONSTITUTION:A vibration sensor 11 transduces the sensed vibration of a turbine shaft 8 to an electrical signal. A full amplitude calculater 13 calculates a full amplitude value of vibration. A synchronized vibration calculater 14 separates the vibration value of a rotating synchronizing vibration component as VOMEGA. The synchronizing double vibration calculater 15 separates a vibration value of the rotating synchronizing double vibration component as Z2OMEGA. A comparater calculater 17 compares all the amplitudes from the full amplitude calculater 13 with a value of V2OMEGA/VOMEGA from the divider 16, and when both values exceed the prescribed relation, an alarm signal is produced. In this way, some cracks in the turbine shaft 8 can properly be detected.
Inventors:
AYANO SHINYA
Application Number:
JP15734981A
Publication Date:
April 08, 1983
Filing Date:
October 02, 1981
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
F01D21/14; F01D25/00; F01D25/04; (IPC1-7): F01D21/14; F01D25/00
Attorney, Agent or Firm:
Kiyoshi Inomata