Nonsynchronous turbine blade vibration monitoring system
AssigneeWestinghouse Electic Corp.
InventorsFrancis S. McKendree, Paul F. Rozelle
Life of this patent
Estimating the term…
Abstract
A nonsynchronous turbine blade vibration monitoring system is comprised of a maximum of two sensors circumferentially mounted along the turbine blade row for detecting the actual arrival times of the turbine blades at the sensors. Expected arrival times of the turbine blades at the sensors are determined and then compared to the actual arrival times in order to obtain turbine blade deflection data. Harmonic analysis is then performed on the blade deflection data to determine the level of vibration at each non-integral harmonic.
Claims17
An apparatus for detecting the vibration of unshrouded turbine blades configured in a row, comprising:
- a maximum of two sensor means circumferentially mounted along the turbine blade row;
- means responsive to said sensor means for producing data based on the actual arrival times of the blades at said sensor means;
- means for producing data based on the expected arrival times of the blades at said sensor means;
- means for comparing said actual arrival time data to said expected arrival time data to obtain turbine blade deflection data;
- and
- analysis means for extracting from said turbine blade deflection data torsional vibration data and the extent of vibration at each non-integral harmonic.
A steam turbine having a system for detecting vibration, comprising:
- a rotor;
- a plurality of unshrouded turbine blades arranged in rows carried by said rotor;
- sensor means circumferentially mounted along the turbine blade rows;
- means, responsive to said sensor means, for producing data based on the actual arrival times of said blades at said sensor means;
- means for producing data based on the expected arrival times of said blades at said sensor means;
- means for comparing said actual arrival time data to said expected arrival time data to obtain turbine blade deflection data;
- and
- analysis means for extracting from said turbine blade deflection data torsional vibration data and the extent of vibration at each non-integral harmonic.
A method of detecting the vibration of unshrouded turbine blades, comprising the steps of:
- generating input signals corresponding to blade passing events;
- producing actual arrival time data from said input signals;
- producing expected arrival time data;
- comparing said actual arrival time data to said expected arrival time data to obtain turbine blade deflection data;
- and
- extracting from said turbine blade deflection data torsional vibration data and the extent of vibration at each non-integral harmonic.
Dependencies are inferred from the claim text.