Tubomachinery blade vibration amplitude measurement through tip timing with capacitance tip clearance probes

Lawson, Craig; Ivey, Paul

doi:10.1016/j.sna.2004.07.002

Cited by 41 publications

(30 citation statements)

References 5 publications

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“…The error introduced by the bend and torsion vibration of the shaft is much smaller compare with the method with OPR sensor. The angle between two sensors is fixed during the measurement, so the impact of the measurement error of rotating speed is the same to all blades, according to (9). Compared with the method use OPR sensor, the impact of the measurement error of rotating speed can be reduced effectively by limiting the installation angle between the sensors.…”

Section: The Preprocessing Methods Without Opr Sensormentioning

confidence: 99%

Analysis of a Signal Preprocessing Method for Blade Tip-Timing without the Once-per Revolution Sensor

Zhang¹,

Duan²,

Jiang³

2017

Proceedings of the 2017 2nd International Conference on Electrical, Automation and Mechanical Engineering (EAME 2017)

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Abstract-Blade tip-timing is an effective method for blade vibration online measurement of turbomachinery. The majority of tip-timing systems require a once-per revolution (OPR) sensor installed close to the shaft to generate timing reference. In this article a tip-timing signal preprocessing method which requires no OPR sensor is analyzed. The method presented uses only tiptiming signal to obtain the vibration information of the blade and the rotating speed of the rotor. Error analysis indicates the method is less sensitive to the bend and torsional vibration of the shaft and the rotating speed measurement error can be limited. The measurement error of vibration displacement difference is analyzed and compared with the method which requires the OPR sensor. Experiments are conducted and the results indicate that the method is feasible for BTT signal preprocess without the OPR sensor and has good accuracy.

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Section: The Preprocessing Methods Without Opr Sensormentioning

confidence: 99%

Analysis of a Signal Preprocessing Method for Blade Tip-Timing without the Once-per Revolution Sensor

Zhang¹,

Duan²,

Jiang³

2017

Proceedings of the 2017 2nd International Conference on Electrical, Automation and Mechanical Engineering (EAME 2017)

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“…The basic concept of the blade tip-timing method has been developed in [1][2][3]. Several probes are installed in the engine casing above the rotor, and the blade transit times between the probes are measured.…”

Section: The Blade Tip-timing Methodsmentioning

confidence: 99%

“…Generally, blade vibrations during operation are difficult to measure and require many sensors in order to be detected fully. Two standard measuring methods are used to obtain blade vibrations: strain gages and frequency-modulated grid systems [1][2][3]. The first method requires the installation of strain gages on some of the blades.…”

Section: Introductionmentioning

confidence: 99%

Parameter Identification of Bladed Assemblies Using a Subspace Method

Salhi

Lardiès²,

Berthillier³

2008

Int. J. Simul. Multidisci. Des. Optim.

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-This paper is aimed at identifying a dynamical model for bladed assemblies such as turbines. Unknown excitation forces are applied to bladed disk assemblies leading to forced vibration responses. Non contact measurement of such vibrations using tip-timing has become an industrial standard procedure and current research focuses on analysis methods for interpretation of measured vibrations. Our purpose is to develop a subspace method for the identification of blade's natural frequencies, damping ratios and mode shapes using blade tip-timing data. The importance of the developed procedure results in the fact that in a narrow band frequency, less than 2 Hz, twenty two modes can be easily identified. A detailed description of this method and results are presented.

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“…These are allowed for dynamic measurement in a surface force apparatus within the range of 0-100 Hz. The vibration amplitude of turbomachinery blade has also been measured through tip timing with capacitance probe sensor [55]. Capacitive sensors are easily fitted for high precision, high resolution, dynamic and non-contact measurements.…”

Section: Capacitive Sensorsmentioning

confidence: 99%