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US 9,995,167 B2Granted
Turbine blade monitoring
AssigneeBAE SYSTEMS plc
InventorDavid John Shepard
Life of this patent
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AssigneeBAE SYSTEMS plc
InventorDavid John Shepard
Estimating the term…
A blade monitoring system and method for a turbine assembly comprising rotating blades (14), the system comprising at least one sensor (10, 12) for transmitting a signal towards said rotating blades and detecting a time-varying return signal therefrom, and one or more processors (20) configured to calculate the time derivative of said return signal, generate a phase variation signal for said time derivative, determine minima points within said phase variation signal and measure said signal at said minima points so as to identify data representative of respective minimum path lengths, each said minimum path length corresponding to the returned signal as each respective blade passes said sensor, and generate, using said minimum path lengths, a time series of data representing the returned signal from individual blades as they pass the sensor.
A blade monitoring system for a turbine assembly comprising rotating blades, the system comprising at least one sensor for transmitting a signal towards said rotating blades and detecting a time-varying return signal therefrom, and one or more processors configured to calculate the time derivative of said return signal, generate a phase variation signal for said time derivative, determine minima points within said phase variation signal and measure said signal at said minima points so as to identify data representative of respective minimum path lengths, each said minimum path length corresponding to the returned signal as each respective blade passes said sensor, and generate, using said minimum path lengths, a time series of data representing the returned signal from individual blades as they pass the sensor.
A method of generating, in an engine health monitoring system for a turbine assembly comprising a plurality of rotating blades, a time series of data representative of a returned signal as individual blades pass a sensor, the method comprising obtaining a time-varying return signal from said rotating blades, calculating the time derivative of said return signal, generating a phase variation signal for said time derivative, determining minima points within said phase variation signal and measuring said signal at said minima points so as to identify data representative of respective minimum path lengths, each said minimum path length corresponding to the returned signal as each respective blade passes said sensor, and generating, using said minimum path lengths, a time series of data representing the returned signal from individual blades as they pass the sensor.
Dependencies are inferred from the claim text.