Blade monitoring system
AssigneeGeneral Electric Company
InventorsSteven Ross Hadley, Charles Terrance Hatch
Life of this patent
Estimating the term…
Abstract
A blade monitoring system for calculating average threshold crossings from interpolated threshold crossings of digital waveform samples is disclosed. Each digital waveform sample is converted by an analog-to-digital converter from one of two split analog signals. Each split analog signal is received from a signal splitter that receives each analog signal from an analog signal transmitter. Each analog signal is from a sensed blade passing signal from at least one row of a plurality of blades on a compressor of a turbine.
Claims20
A system, comprising:
- a turbine including a compressor having at least one row of a plurality of blades;
- a sensor for sensing a blade passing signal of at least one of the plurality of blades;
- an analog signal transmitter for transmitting an analog signal for the blade passing signal;
- a signal splitter for splitting the analog signal into at least two split analog signals;
- at least two analog-to-digital (AD) converters, each AD converter converting each split analog signal to at least two digital waveform samples;
- and a blade monitoring system that:
- calculates at least two interpolated threshold crossings, each interpolated threshold crossing calculated from at least two digital waveform samples from each AD converter, wherein the at least two digital waveform samples connect a digital waveform sample coordinates line and each interpolated threshold crossing is where the digital waveform sample coordinates line crosses a predetermined threshold level;
- and
- calculates an average threshold crossing (ATC) of the at least two interpolated threshold crossings.
A method, comprising:
- sensing a blade passing signal of at least one blade;
- creating an analog signal for the blade passing signal;
- splitting the analog signal into at least two split analog signals;
- converting each split analog signal to at least two digital waveform samples;
- and
- calculating an interpolated threshold crossing for each of the at least two digital waveform samples, wherein at least two interpolated threshold crossings are calculated, wherein the at least two digital waveform samples connect a digital waveform sample coordinates line and each interpolated threshold crossing is where the digital waveform sample coordinates line crosses a predetermined threshold level;
- and
- calculating an average threshold crossing (ATC) of the at least two interpolated threshold crossings.
A computer program product comprising program code embodied in at least one non-transitory computer-readable storage medium, which when executed, enables a computer system to implement a method, the method comprising:
- receiving at least four digital waveform samples from at least two analog-to-digital (AD) converters, wherein a blade passing signal of a blade on a compressor in a turbine is transmitted as an analog signal, wherein a splitter splits the analog signal, wherein the at least two AD converters convert each split analog signal to at least two digital waveform samples;
- calculating an interpolated threshold crossing for the at least two digital waveform samples from each AD converter, wherein at least two interpolated threshold crossings are calculated, wherein the at least two digital waveform samples connect a digital waveform sample coordinates line and each interpolated threshold crossing is where the digital waveform sample coordinates line crosses a predetermined threshold level;
- and
- calculating an average threshold crossing (ATC) of the at least two interpolated threshold crossings.
Dependencies are inferred from the claim text.