GB2416848A - Capacitive measurement of rotor blade speed and vibration - Google Patents

Capacitive measurement of rotor blade speed and vibration Download PDF

Info

Publication number
GB2416848A
GB2416848A GB0417035A GB0417035A GB2416848A GB 2416848 A GB2416848 A GB 2416848A GB 0417035 A GB0417035 A GB 0417035A GB 0417035 A GB0417035 A GB 0417035A GB 2416848 A GB2416848 A GB 2416848A
Authority
GB
United Kingdom
Prior art keywords
capacitance
rotor
measuring
blade
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0417035A
Other versions
GB0417035D0 (en
Inventor
Andrew Stevenson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB0417035A priority Critical patent/GB2416848A/en
Publication of GB0417035D0 publication Critical patent/GB0417035D0/en
Publication of GB2416848A publication Critical patent/GB2416848A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/483—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable capacitance detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties

Abstract

The rotational speed and azimuthal vibration of blades 14 of a rotor 4 (e.g. of a gas turbine engine) are determined by measuring the capacitance between a rotating blade 4 and a point 22 off an axis 16 about which the blades rotate. Capacitive sensors 8 (92, figure 4) are placed off-axis (e.g. in the rotor casing 6). To determine blade speed, capacitance measurements are taken at two different times and the periodic variation in the capacitance signal as the blades pass the sensor is used to calculate the blade speed. To determine blade vibration, at least three capacitance measurements are taken at three different times using three sensors separated in the azimuthal direction (figure 4). The phase difference between the measurements is compared to the expected phase difference to calculate the vibration.

Description

241 6848 A Method for Measuring the Blade Speed of a Rotor Embodiments of
the present invention relate to a method for measuring the blade speed of a rotor. In particular they relate to a method for measuring the blade speed of a rotor in a gas turbine engine.
Current methods of measuring the blade speed of rotors in gas turbine engines use a variable reluctance sensor.
The reluctance sensor comprises a magnet with a coil wrapped around it. The reluctance sensor is positioned near a toothed wheel made of ferrous material which is mounted on the shaft of the rotor. As the rotor shaft rotates the teeth on the wheel cut through the magnetic field of the reluctance sensor and induce an alternating current in the coil. The frequency of the current induced is proportional to the speed of the rotating wheel and can be used to give an indication of the blade speed of the rotor.
These reluctance sensors are positioned in the core of the engine so are difficult to get to if they fail or need replacing. Also the reluctance sensors only measure one thing, the speed of rotation of the shaft. They do not measure the vibration of the blades. Separate sensors are also required to measure the tip clearance between the rotor blades and the casing.
According to one aspect of the present invention there is provided a method for measuring the blade speed of a rotor comprising a plurality of blades rotating about an axis, the method comprising, obtaining a first measurement of a capacitance between a rotating blade and a point offaxis at a first time, obtaining a second measurement of a capacitance between a rotating blade and a point off-axis at a second time, and processing the first capacitance measurement obtained at a first time and the second capacitance measurement obtained at a second time to give an indication of the blade speed of the rotor.
This method of measuring the blade speed of a rotor is particularly advantageous for rotors in gas turbine engines, for instance, compressors or turbines. The present invention provides an advantage over current methods of measuring blade speed in that the sensor used to obtain the measurements is no longer positioned in the centre of the engine and is therefore much easier to get to for maintenance or replacing. There is a further advantage in that the capacitance measurements could also be used as a measure of something other than blade speed, for instance, the tip clearance between the rotor blades and the casing or the azimuthal vibration of the rotating blades.
In an embodiment of the present invention the measured capacitance is periodic and the period is related to the blade speed of the rotor. A first measurement may be made at a maximum or minimum of the capacitance, and a second measurement may be made at a different maximum or minimum so that the time between the first and second measurements gives an indication of the period of the capacitance which can be processed to give an indication of the blade speed of the rotor. Preferably the capacitance measurements are made at the same off-axis point. In another embodiment the capacitance may be measured continually.
According to another aspect of the present invention there is provided a system for measuring the blade speed of a rotor comprising a plurality of blades for rotation about an axis, the system comprising, at least one sensor, positioned at a point off-axis, for measuring capacitance as a rotating blade passes the point off-axis and means for converting the measurements of the at least one sensor into an indication of the blade speed of the rotor.
In an embodiment of the invention the sensor may be positioned at an offaxis point in the same plane as the rotor blades. The sensor may be located in the casing of the rotor.
Preferably each blade of the rotor extends radially from the axis of rotation to a tip and there is a gap between the sensor and the tip of the blades. There may be a minimum gap between the sensor and the blade tips.
Preferably the minimum gap extends in the radial direction.
In an embodiment the means for converting the capacitance measurements into an indication of the blade speed may be a processing circuit. Preferably the circuit comprises an oscillator, which may be a tuneable oscillator, for converting the periodic capacitance into a sinusoidal signal. The processing circuit may also comprise a filter for converting the sinusoidal signal from the oscillator into a square wave signal. The processing circuit may further comprise an analogue to digital converter and a computer. The analogue to digital converter can convert the filtered analogue signal into a digital input for the computer. The computer can process the digital input into an output giving an indication of the blade speed. In another embodiment the means for converting the capacitance measurements into an indication of the blade speed may be a pulse timer circuit. The pulse timer circuit may measure the period between maxima or minima of the capacitance measurements and thus determine the blade speed of the rotor.
According to a further aspect of the present invention there is provided a method of measuring the azimuthal vibration of rotating blades in a rotor comprising a plurality of blades rotating about an axis, the method comprising, obtaining a first measurement of a capacitance between a rotating blade and a point off-axis at a first time, obtaining a second measurement of a capacitance between a rotating blade and a point offaxis at a second time, obtaining a third measurement of a capacitance between a rotating blade and a point off-axis at a third time, obtaining a measure of the phase difference between the first and second capacitance measurements, obtaining a measure of the phase difference between the first and third capacitance measurements, and processing the phase difference measurements to give an indication of the azimuthal vibration of the rotating blades.
An advantage provided by this particular aspect of the present invention is that the same sensors can be used to measure the blade speed and azimuthal vibration.
In one embodiment each measurement of capacitance may be made at a different off-axis point. Preferably the measurements are periodic and are not in phase with each other. An indication of the azimuthal vibration may be obtained by comparing the measured phase difference to the expected phase difference.
According to another aspect of the present invention there is provided a system for measuring the azimuthal vibration of rotating blades in a rotor comprising a plurality of blades for rotation about an axis, the system comprising, at least one sensor, positioned at a point off- axis, for measuring capacitance as a blade passes the point off axis such that at least three capacitance measurements are made, means for determining the phase difference between at least two pairs of capacitance measurements and means for converting the phase difference measurements into an indication of the azimuthal vibration of the rotating blades.
According to yet another aspect of the present invention there is provided a sensor arrangement, comprising a plurality of sensors arranged to independently measure capacitance at different positions along the direction of movement of a rotating blade of a rotor as the blade passes the sensor arrangement.
In one embodiment the sensor arrangement comprises three sensors. The sensors are preferably spaced from each other so that the capacitance measurements are not in phase with each other. Preferably the sensor arrangement is located at an off-axis point, for instance in the rotor casing, preferably in the same plane as the rotor blades.
For a better understanding of the present invention reference will now be made by way of example only to the accompanying drawings in which: Fig. 1 illustrates a system for measuring the blade speed of a rotor, Fig. 2 illustrates the processing circuit from Fig. 1 in more detail, Fig. 3 illustrates the output of the tuneable oscillator from Fig 2, Fig. 4 illustrates a system for measuring the azimuthal vibration of rotor blades, and Fig. 5 illustrates the capacitance measurements of the sensor arrangement in Fig. 4.
The Figures illustrate a method for measuring the blade speed of a rotor 4 comprising a plurality of blades 14 rotating about an axis 16, the method comprising, obtaining a first measurement 52 of a capacitance between a rotating blade 14 and a point off-axis 22 at a first time, obtaining a second measurement 54 of a capacitance between a rotating blade 14 and a point off-axis 22 at a second time and processing the first capacitance measurement 52 obtained at a first time and the second capacitance measurement 54 obtained at a second time to give an indication of the blade speed of the rotor 4.
In more detail Fig. 1 illustrates a system 2 for measuring the blade speed of a rotor 4. The system comprises a casing 6, a sensor 8 for measuring capacitance and a processing circuit 10. The processing circuit 10 converts the capacitance measurements of the sensor 8 into an output 12 which indicates the blade speed of the rotor 4. The rotor 4 comprises a plurality of blades 14 that rotate in a radial plane about an axis 16. Each blade 14 extends radially from the axis 16 and terminates at a tip 18. The sensor 8 is positioned in the radial plane of the rotor blades 14 at an off-axis point 22. The sensor 8 is positioned in the casing 6 but they are electrically isolated from each other. The minimum gap 20 between the blades 14 and the sensor 8 is in the radial direction between the blade tip 18 and the sensor 8. The rotor 4 may be part of a turbine or a compressor in a gas turbine engine. The sensor 8 may be of any form suitable for measuring capacitance, for instance, a metal plate.
The sensor 8 measures the capacitance between a blade tip 18 and the off axis point 22. The magnitude of the capacitance measured depends upon the separation between the off-axis point 22 and the blade tips 18. As the blades 14 rotate, this separation will periodically increase then decrease. The maximum capacitance is measured when the separation is the minimum gap 20. The period of the measured capacitance depends upon the speed of rotation of the blades 14 and their angular separation.
Fig. 2 illustrates an example of the processing circuit 10 of Fig. 1 in more detail. The processing circuit 10 is connected to the capacitance sensor 8. The processing circuit 10 comprises a tuneable oscillator 30, a low pass filter 32 and frequency to voltage converter 33, an analogue to digital converter 34 and a computer system 36. The processing circuit 10 converts the capacitance measurements of the sensor 8 into an output 12 which gives an indication of the blade speed of the rotor 4.
The tuneable oscillator 30 produces a sinusoidal output 50. Fig. 3 illustrates an example of the oscillator output 50. The output 50 varies between a maximum frequency 56 and a minimum frequency 58. The variation in frequency of the oscillator output 50 corresponds to the periodic variation of the magnitude of the measured capacitance between the sensor 8 and the blade tips 18. The period 60 of the frequency variation in the oscillator output 50 corresponds to the period of the measured capacitance.
Since the period of the measured capacitance depends upon the speed of rotation of the blades 14 and their angular separation, if the angular separation of the blades 14 is known, the blade speed can be calculated from a measurement of the period 60.
The sensor 8, in this example, measures the capacitance continually. The measurements comprise a first measurement 52 taken at a minimum of the oscillator output 50 separated by a period 60 from a second measurement 54 taken at another minimum of the oscillator output 50.
Alternatively the first and second measurements may be at corresponding maxima. It should be understood that at least two measurements are required to calculate the period 60 of the oscillator output 50 and in other embodiments the capacitance sensor may make discrete measurements.
The output 50 from the tuneable oscillator 30 passes through the low pass filter 32 to the frequency to voltage converter 33. The low pass filter 32 filters out the higher frequencies from the sinusoidal oscillator output 50 to produce the filtered oscillator output 35. The low pass filter 32 may also remove noise from the oscillator output 50. The frequency to voltage converter 33 converts the filtered oscillator output 35 into a voltage signal 37 where the amplitude of the voltage signal 37 corresponds to the frequency of the filtered oscillator output 35.
The voltage signal 37 passes from the frequency to voltage converter 33 to the analogue to digital converter 34. The analogue to digital converter 34 converts the analogue voltage signal 37 into a digital input 39 suitable for processing by the computer system 36. The computer system 36 processes the information from the digital input 39 to give the period 60 of the oscillator output signal 50 and hence the period of the capacitance. This can then be used to produce an output signal 12 which indicates the blade speed of the rotor 4. The error in the measurement of the blade speed gives an indication of the azimuthal vibration of the rotating blades 14.
Fig. 4 illustrates a system 81 for measuring the azimuthal vibration of the rotating blades 14 in a rotor 4, i.e. the vibration in the direction of rotation of the blades 14. The rotor 4 is described with reference to Fig. 1. The system 81 comprises a multi-sensor arrangement 80, a processing circuit 86 for converting the output of the multi-sensor arrangement 80 into a vibration output 84.
The processing circuit 86 for converting the capacitance measurements into a vibration output 84 comprises an array of analogue to digital converters 88 and a digital signal processor 90. The multi-sensor arrangement 80 comprises at least three individual sensors 92. Each sensor 92 in the multi-sensor arrangement 80 is positioned at a point off- axis in the casing 6 in the same radial plane as the rotating blades 14. The sensors 92 are separated from each other in the azimuthal direction by gaps 94 so that each sensor 92 produces its own individual measurement of capacitance as the blade tip 18 passes by.
Fig. 5 illustrates an example of the capacitance measurements 110, 112, and 114 of the sensors 92 in the multi-sensor arrangement 80. The capacitance measurement is periodic. The maxima 120 correspond to the position of the blades 14 where the separation between the blade tip 18 and the sensor 92 is the minimum gap 82. The minima 122 correspond to the position of the rotor blades 14 where the separation is a maximum. Each sensor 92 measures a maximum or a minimum at a different time to the other sensors in the multi-sensor arrangement 80. Thus there is a phase difference 116 between the first measurement 110 and second measurement 112 and a phase difference 118 between the first measurement 110 and third measurement 114. The phase differences expected depend upon the relative positions of the sensors 92 and the speed of the blades 14. Any deviation from the expected phase difference may be attributed to an azimuthal vibration of the blades 14.
Therefore a measurement of the phase differences 116 and 118 gives an indication of the azimuthal vibration of the rotating blades 14.
Each capacitance measurement 110, 112 and 114 of the sensor arrangement is converted, by a respective analogue to digital converter 88, into respective digital signal 111, 113 and 115 so that they can be processed by the digital signal processor 90. The digital signal processor calculates the phase difference between the sensor measurements and from those phase differences produces an output 84 giving an indication of the azimuthal vibration of the rotor blades 14.
Although embodiments of the present invention have been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications to the examples given can be made without departing from the scope of the invention as claimed. For instance a pulse timer circuit could be used to measure the period between maxima or minima of the capacitance measurements and thus determine the blade speed of the rotor.
Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.

Claims (24)

  1. Claims 1. A method for measuring the blade speed of a rotor comprising a
    plurality of blades rotating about an axis, the method comprising; obtaining a first measurement of a capacitance between a rotating blade and a point off-axis at a first time; obtaining a second measurement of a capacitance between a rotating blade and a point off-axis at a second time; and processing the first capacitance measurement obtained at the first time and the second capacitance measurement obtained at the second time to give an indication of the blade speed of the rotor.
  2. 2. A method for measuring the blade speed of a rotor as claimed in claim 1 wherein the first measurement of capacitance and the second measurement of capacitance are made at the same off-axis point.
  3. 3. A method for measuring the blade speed of a rotor as claimed in any preceding claim wherein the capacitance is periodic.
  4. 4. A method for measuring the blade speed of a rotor as claimed in claim 3 wherein the first measurement of capacitance is a maximum or a minimum of the periodic capacitance.
  5. 5. A method for measuring the blade speed of a rotor as claimed in claim 3 or 4 wherein the second measurement of capacitance is a maximum or minimum of the periodic capacitance.
  6. 6. A method for measuring the blade speed of a rotor as claimed in any of claims 3 to 5 wherein the time between the first and second measurements of capacitance gives an indication of the period of the capacitance which is related to the blade speed.
  7. 7. A method for measuring the blade speed of a rotor as claimed in any preceding claim wherein the capacitance is measured continually.
  8. 8. A method for measuring the blade speed of a rotor as claimed in any preceding claim wherein the error in the measurement of the blade speed gives an indication of the azimuthal vibration of the rotating blades.
  9. 9. A system for measuring the blade speed of a rotor comprising a plurality of blades for rotation about an axis, the system comprising; at least one sensor, positioned at a point off-axis, for measuring capacitance as a rotating blade passes the point off-axis; and means for converting the measurements of the at least one sensor into an indication of the blade speed of the rotor.
  10. 10. A system for measuring the blade speed of a rotor as claimed in claim 9 wherein each rotor blade has a tip and there is a minimum gap between the at least one sensor and the tips of the rotor blades.
  11. 11. A system for measuring the blade speed of a rotor as claimed in claim 10 wherein the minimum gap between the at least one sensor and the tip of the rotor blade is in the radial direction.
  12. 12. A system for measuring the blade speed of a rotor as claimed in any of claims 9 to 11 wherein the at least one sensor is located in the rotor casing.
  13. 13. A system for measuring the blade speed of a rotor as claimed in any of claims 9 to 12 wherein the means for converting the capacitance measurements into an indication of the blade speed is a processing circuit which comprises an oscillator for converting the periodic capacitance into a sinusoidal signal, a filter for converting the sinusoidal signal into a square wave signal, an analogue to digital converter, and a computer for calculating the period of the capacitance.
  14. 14. A system as claimed in any of the claims 9 to 13 wherein the rotor is part of a turbine or a compressor in a gas turbine engine.
  15. 15. A method of measuring the azimuthal vibration of rotating blades in a rotor comprising a plurality of blades rotating about an axis, the method comprising; obtaining a first measurement of a capacitance between a rotating blade and a point off-axis at a first time; obtaining a second measurement of a capacitance between a rotating blade and a point offaxis at a second time; obtaining a third measurement of a capacitance between a rotating blade and a point off-axis at a third time; obtaining a measure of the phase difference between the first and second capacitance measurements; obtaining a measure of the phase difference between the first and third capacitance measurements; and processing the phase difference measurements to give an indication of the azimuthal vibration of the rotating blades.
  16. 16. A method of measuring the azimuthal vibration of rotating blades as claimed in claim 15 wherein the difference between the measured phase difference and the expected phase difference gives an indication of the azimuthal vibration of the rotating blades.
  17. 17. A method of measuring the azimuthal vibration of rotating blades as claimed in claims 15 or 16 wherein the first, second and third measurements are made at different points off-axis.
  18. 18. A system for measuring the azimuthal vibration of rotating blades in a rotor comprising a plurality of blades for rotation about an axis, the system comprising; at least one sensor, positioned at a point off-axis, for measuring capacitance as a blade passes the point off axis such that at least three capacitance measurements are made; means for determining the phase difference between at least two pairs of capacitance measurements; and means for converting the phase difference measurements into an indication of the azimuthal vibration of the rotating blades.
  19. 19. A system for measuring the azimuthal vibration of rotating blades as claimed in claim 18 wherein the system comprises three sensors, each of which produces one of the at least three capacitance measurements.
  20. 20. A system for measuring the azimuthal vibration of rotating blades as claimed in claim 19 wherein the three sensors and the rotating blades are in the same plane.
  21. 21. A system for measuring the azimuthal vibration of rotating blades as claimed in claim 20 wherein the sensors are spaced from each other.
  22. 22. A sensor arrangement, comprising a plurality of individual sensors arranged to independently measure capacitance at different positions along the direction of movement of a rotating blade of a rotor as the blade passes the sensor arrangement.
  23. 23. A method for measuring the blade speed of a rotor substantially as hereinbefore described with reference to and/or as shown in the accompanying drawings.
  24. 24. Any novel subject matter or combination including subject matter disclosed, whether or not within the scope of or relating to the same invention as the preceding claims.
GB0417035A 2004-07-30 2004-07-30 Capacitive measurement of rotor blade speed and vibration Withdrawn GB2416848A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0417035A GB2416848A (en) 2004-07-30 2004-07-30 Capacitive measurement of rotor blade speed and vibration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0417035A GB2416848A (en) 2004-07-30 2004-07-30 Capacitive measurement of rotor blade speed and vibration

Publications (2)

Publication Number Publication Date
GB0417035D0 GB0417035D0 (en) 2004-09-01
GB2416848A true GB2416848A (en) 2006-02-08

Family

ID=32947726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0417035A Withdrawn GB2416848A (en) 2004-07-30 2004-07-30 Capacitive measurement of rotor blade speed and vibration

Country Status (1)

Country Link
GB (1) GB2416848A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008031394A3 (en) * 2006-09-14 2008-05-02 Mtu Aero Engines Gmbh Measuring arrangement for detecting a rotary momentum of an engine rotor, and associated method
US7941281B2 (en) 2008-12-22 2011-05-10 General Electric Company System and method for rotor blade health monitoring
US8002517B2 (en) 2006-10-31 2011-08-23 Rolls-Royce Plc Sensor
US20130106253A1 (en) * 2007-05-15 2013-05-02 Cummins Turbo Technologies Ltd Rotating machine sensor
US8457909B2 (en) 2008-12-16 2013-06-04 Rolls-Royce Plc Timing analysis
EP2921654A1 (en) * 2014-02-12 2015-09-23 Rolls-Royce plc Time reference derivation from time of arrival measurements
US9880188B2 (en) 2009-08-28 2018-01-30 Cummins Turbo Technologies Limited Speed sensor authority for and method of measuring speed of rotation
CN108267217A (en) * 2017-12-29 2018-07-10 三英精控（天津）仪器设备有限公司 Shake noise analysis system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101750198B (en) * 2008-11-28 2011-10-05 上海宝钢工业检测公司 Method for measuring corresponding phase positions of vibration signals of different measuring points of rotary machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB980323A (en) * 1961-03-21 1965-01-13 Atomic Energy Authority Uk Improvements in or relating to flowmeters
GB1404133A (en) * 1971-07-20 1975-08-28 Abbirko Instr Ltd Anemometers
EP0065458A1 (en) * 1981-05-15 1982-11-24 Societe Nationale D'etude Et De Construction De Moteurs D'aviation, "S.N.E.C.M.A." Capacitive detector for the displacement of objects
EP0334441A1 (en) * 1988-03-25 1989-09-27 Thermocoax Capacitive transducer
GB2314631A (en) * 1996-06-26 1998-01-07 Philips Electronics Nv Composite capacitive sensor device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB980323A (en) * 1961-03-21 1965-01-13 Atomic Energy Authority Uk Improvements in or relating to flowmeters
GB1404133A (en) * 1971-07-20 1975-08-28 Abbirko Instr Ltd Anemometers
EP0065458A1 (en) * 1981-05-15 1982-11-24 Societe Nationale D'etude Et De Construction De Moteurs D'aviation, "S.N.E.C.M.A." Capacitive detector for the displacement of objects
US4482859A (en) * 1981-05-15 1984-11-13 S.N.E.C.M.A. Object displacement sensor and device for measuring the rotation speed and vibration frequency of a rotor
EP0334441A1 (en) * 1988-03-25 1989-09-27 Thermocoax Capacitive transducer
US4950084A (en) * 1988-03-25 1990-08-21 U.S. Philips Corporation Capacitive sensor
GB2314631A (en) * 1996-06-26 1998-01-07 Philips Electronics Nv Composite capacitive sensor device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008031394A3 (en) * 2006-09-14 2008-05-02 Mtu Aero Engines Gmbh Measuring arrangement for detecting a rotary momentum of an engine rotor, and associated method
US8138753B2 (en) 2006-09-14 2012-03-20 Mtu Aero Engines Gmbh Measuring arrangement for detecting a 1/rotary momentum of an engine rotor, and associated method
US8002517B2 (en) 2006-10-31 2011-08-23 Rolls-Royce Plc Sensor
US20130106253A1 (en) * 2007-05-15 2013-05-02 Cummins Turbo Technologies Ltd Rotating machine sensor
US9562923B2 (en) * 2007-05-15 2017-02-07 Cummins Turbo Technologies Limited Speed sensor for a rotating member or machine
US8457909B2 (en) 2008-12-16 2013-06-04 Rolls-Royce Plc Timing analysis
US7941281B2 (en) 2008-12-22 2011-05-10 General Electric Company System and method for rotor blade health monitoring
US9880188B2 (en) 2009-08-28 2018-01-30 Cummins Turbo Technologies Limited Speed sensor authority for and method of measuring speed of rotation
EP2921654A1 (en) * 2014-02-12 2015-09-23 Rolls-Royce plc Time reference derivation from time of arrival measurements
US10168306B2 (en) 2014-02-12 2019-01-01 Rolls-Royce Plc Time reference derivation from time of arrival measurements
CN108267217A (en) * 2017-12-29 2018-07-10 三英精控（天津）仪器设备有限公司 Shake noise analysis system

Also Published As

Publication number Publication date
GB0417035D0 (en) 2004-09-01

Similar Documents

Publication Publication Date Title
Lawson et al. Tubomachinery blade vibration amplitude measurement through tip timing with capacitance tip clearance probes
US5519300A (en) Method and apparatus for analysis of polyphase electrical motor systems
US8683866B2 (en) Method of matching sensors in a multi-probe turbine blade vibration monitor
US5521482A (en) Method and apparatus for determining mechanical performance of polyphase electrical motor systems
CA2647306C (en) Method and apparatus for monitoring the rotational speed of a shaft
CN111579060B (en) High-precision rotating blade vibration measurement method based on blade tip timing technology
US6263738B1 (en) Vibration phasor monitoring system for rotating members
CN105675113B (en) Rotating machinery angular domain vibration signal acquisition device based on microsensor and method
KR20100131389A (en) Lateral, angular and torsional vibration monitoring of rotordynamic systems
Yu et al. A data processing method for determining instantaneous angular speed and acceleration of crankshaft in an aircraft engine–propeller system using a magnetic encoder
US10281297B2 (en) Blade tip timing
GB2416848A (en) Capacitive measurement of rotor blade speed and vibration
US10539588B2 (en) Method for reducing error in rotor speed measurements
EP2073022B1 (en) Method and apparatus for monitoring the rotational speed of a gas turbine shaft
EP3055661B1 (en) A method for determining current eccentricity of rotating rotor and method of diagnostics of eccentricity of rotating rotor
JP2013083568A (en) Blade vibration measuring device
EP2073021B1 (en) Method and apparatus for monitoring the rotational speed of a shaft
De León et al. Discrete time interval measurement system: fundamentals, resolution and errors in the measurement of angular vibrations
RU2584723C1 (en) Method of determining parameters of oscillations of blades of rotating wheel of turbine machine and device therefor
Liska et al. Measurement and evaluation of shaft torsional vibrations using shaft instantaneous angular velocity
RU2229104C1 (en) Method establishing parameters of vibrations of blades of turbomachines
RU2651628C1 (en) Method for measurement with given accuracy of radial clearances between impeller blades and stator shell of turbomachine with discrete reception of information from sensor
RU2244272C1 (en) Method for metering vibration amplitudes of turbomachine blades
Zhang et al. Torsion Vibration Measurement on Rotating Shaft System using Differential Round Capacitive Grating
Lawson et al. The Measurement of Turbomachinery Blade Vibration Through Tip Timing With Capacitance Tip Clearance Probes

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)