Blade-Tip Timing Measurement of Synchronous Vibrations of Rotating Bladed Assemblies

Dimitriadis, Grigorios; Carrington, Ian B.; Wright, J.F.; Cooper, Jonathan E.

doi:10.1006/mssp.2002.1489

Cited by 140 publications

(68 citation statements)

References 16 publications

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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%

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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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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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“…The BTT system measures the time when a blade tip arrives at the tip-timing sensor, and the time of arrival (TOA) changes because of the blade vibration. The tip-timing data is converted to the vibration displacement, and parameters such as vibration frequency, amplitude and modal can be analyzed through the identification algorithm [4]- [6]. The TOA can be acquired by different kinds of sensor such as optical fiber sensor, capacitive sensor, magnetoresistive sensor and microwave sensor [7]- [10].…”

Section: Introductionmentioning

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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“…Because both experimental [7] and numerical [8][9][10][11] approaches are expensive to obtain robust results, simplified models have been developed to reveal nonlinear effects of system parameters on the dynamic responses of the system. Generally turbine blades are simplified as the elastic clamped-free beams both in experimental [12] and numerical analysis [13][14][15][16] . The two-dimensional friction contact problem and impact vibration characteristics of a rotational blade in the centrifugal force field were analyzed [17,18] , in which the blade was simplified as a continuous cantilever.…”

Section: Introductionmentioning

confidence: 99%

Bifurcation and dynamic response analysis of rotating blade excited by upstream vortices

Chen

Wang

Wiercigroch

et al. 2016

Appl. Math. Mech.-Engl. Ed.

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A reduced model simulating vortex-induced vibrations (VIVs) for turbine blades is proposed and analyzed. The rotating blade is modeled as a uniform cantilever beam while a van der Pol oscillator is used to represent the time-varying characteristics of the vortex shedding, which interacts with equations of motion for a blade to simulate the fluid-structure interaction. The action for the structural motion on the fluid is considered as a linear inertia coupling. Nonlinear characteristics for the dynamic responses are investigated with the multiple scale method and the modulation equations are derived. The transition set consisting of the bifurcation and hysteresis sets is constructed by using the singularity theory and the effects of system parameters including the van der Pol damping and the coupling parameter on the equilibrium solutions are analyzed. Frequency-response curves are obtained and the stabilities are determined by using the Routh-Hurwitz criterion. The phenomena including the saddle-node and Hopf bifurcations are found to occur under certain parameter values. A direct numerical method is used to analyze the dynamic characteristics for the original system and verify the validity of the multiple scale method. The results indicate that the new coupled model can be useful to explain the rich dynamic response characteristics including possible bifurcation phenomena in the VIVs.

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Blade-Tip Timing Measurement of Synchronous Vibrations of Rotating Bladed Assemblies

Cited by 140 publications

References 16 publications

Parameter Identification of Bladed Assemblies Using a Subspace Method

Parameter Identification of Bladed Assemblies Using a Subspace Method

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

Bifurcation and dynamic response analysis of rotating blade excited by upstream vortices

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