Method of on-line turbine blade slope and sensor position verification
First Claim
1. A method of monitoring a blade structure in a turbine comprising a plurality of radially extending blades mounted on a rotor for rotation about a rotational axis, said blade structure including at least one target portion located at a radially outer location of said blade structure, said method comprising the steps of:
- providing a sensor adjacent said blade structure;
positioning said sensor at a first location adjacent said blade structure;
generating a first signal corresponding to a first target passing event sensed by said sensor at said first location;
positioning said sensor at a second location adjacent said blade structure a known displacement from said first location;
generating a second signal corresponding to a second target passing event sensed by said sensor at said second location; and
producing target slope data from said first and second signals and said known displacement of said sensor.
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Accused Products
Abstract
A method of monitoring vibrations in a blade structure of a turbine including generating signals from a sensor located adjacent to a radial outer edge of the blade structure to sense passage of targets located on the blade structure. The sensor is mounted eccentrically and the signals are obtained with the sensor located at different angular positions. In a first aspect of the invention, the signals from the sensor are used to determine a target slope angle of a target on a first turbine blade during operation of the turbine. In a second aspect of the invention, the signals from the sensor are used to position the sensor in response to a sensed variation in the axial position of the target on the first turbine blade.
16 Citations
18 Claims
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1. A method of monitoring a blade structure in a turbine comprising a plurality of radially extending blades mounted on a rotor for rotation about a rotational axis, said blade structure including at least one target portion located at a radially outer location of said blade structure, said method comprising the steps of:
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providing a sensor adjacent said blade structure; positioning said sensor at a first location adjacent said blade structure; generating a first signal corresponding to a first target passing event sensed by said sensor at said first location; positioning said sensor at a second location adjacent said blade structure a known displacement from said first location; generating a second signal corresponding to a second target passing event sensed by said sensor at said second location; and producing target slope data from said first and second signals and said known displacement of said sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of positioning a blade vibration monitor sensor for monitoring a blade structure in a turbine comprising a plurality of radially extending blades mounted on a rotor for rotation about a rotational axis, said blade structure including at least one target portion located at a radially outer location of said blade structure, said method comprising the steps of:
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providing a sensor adjacent said blade structure; moving said sensor between first and second locations relative to said blade structure; sensing first and second target passing events corresponding to said at least one target passing said sensor at said first and second locations; generating first and second signals corresponding to said first and second target passing events, respectively; and compensating for axial displacement of said blade during operation of said turbine by monitoring said second signal and moving said sensor to maintain said second signal within a preset range of said first signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification