A Blade Tip Timing Method Based on a Microwave Sensor

Zhang, Jilong; Duan, Fajie; Niu, Guangyue; Jiajia, Jiang; Li, Jie

doi:10.3390/s17051097

Cited by 35 publications

(26 citation statements)

References 21 publications

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“…This kind of a coarse measurement, known as Zablotskiy method [42], should, therefore, be used only as a first approximation, while reliable synchronous vibration measurement requires a multi-sensor system. This is extremely important as viewing displacement plots for blades provides very little information but is often considered by engineers as an essential tool e.g., [3,43,44].…”

Section: Eo2 Forced Responsementioning

confidence: 99%

Non-Contact Measurement of Blade Vibration in an Axial Compressor

Przysowa

Russhard²

2019

Sensors

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Complex blade responses such as a rotating stall or simultaneous resonances are common in modern engines and their observation can be a challenge even for state-of-the-art tip-timing systems and trained operators. This paper analyses forced vibrations of axial compressor blades, measured during the bench tests of the SO-3 turbojet. In relation to earlier studies conducted in Poland with a small number of sensors, a multichannel tip-timing system let us observe simultaneous responses or higher-order modes. To find possible symptoms of a failure, blade responses in a healthy and unhealthy engine configuration with an inlet blocker were studied. The used analysis methods covered all-blade spectrum and the circumferential fitting of blade deflections to the harmonic oscillator model. The Pearson coefficient of correlation between the measured and predicted tip deflection is calculated to evaluate fitting results. It helps to avoid common operator mistakes and misinterpreting the results. The proposed modal solver can track the vibration frequency and adjust the engine order on the fly. That way, synchronous and asynchronous vibrations are observed and analysed together with an extended variant of least squares. This approach saves a lot of work related to configuring the conventional tip-timing solver.

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Section: Eo2 Forced Responsementioning

confidence: 99%

Non-Contact Measurement of Blade Vibration in an Axial Compressor

Przysowa

Russhard²

2019

Sensors

View full text Add to dashboard Cite

show abstract

“…This is extremely important as viewing displacement plots for blades provides very little information but is often considered by engineers as an essential tool e.g. [3,41,42].…”

Section: Eo2 Forced Responsementioning

confidence: 99%

Non-Contact Measurement of Blade Vibration in an Axial Compressor

Przysowa¹,

Russhard²

2019

Preprint

View full text Add to dashboard Cite

Complex blade responses such as a rotating stall or simultaneous resonances are common in modern engines and their observation can be a challenge even for state-of-the-art tip-timing systems and trained operators. This paper analyses forced vibrations of axial compressor blades, measured during the bench tests of the SO-3 turbojet. In relation to earlier studies conducted in ITWL with a small number of sensors, a multichannel tip-timing system let us observe simultaneous responses or higher-order modes. To find possible symptoms of a failure, blade responses in a healthy and unhealthy engine configuration with an inlet blocker were studied. The used analysis methods covered all-blade spectrum and the circumferential fitting of blade deflections to the harmonic oscillator model. The proposed modal solver can track the vibration frequency and adjust the engine order on the fly. That way, synchronous and asynchronous vibrations are observed and analysed together with an extended variant of least squares. The proposed approach helps to avoid common mistakes and saves a lot of work related to configuring the conventional solver.

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“…Many methods have been proposed to detect displacement or clearance over the last few decades (e.g., capacitive sensors [ 12 ], magnetic sensors [ 13 , 14 , 15 ], microwave sensors [ 16 ], optical sensors [ 17 ], and inductive sensors [ 18 , 19 , 20 ]). Compared with other methods, capacitive sensors have the advantages of high resolution and good dynamic performance [ 21 , 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Error Analysis of a Spherical Capacitive Sensor for the Micro-Clearance Detection in Spherical Joints

et al. 2020

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Spherical joints have attracted increasing interest in the engineering applications of machine tools, industrial robots, medical equipment, and so on. As one of the promising methods of detecting the micro-clearance in spherical joints, the measurement accuracy of a spherical capacitive sensor could be affected by imperfectness during the manufacturing and installation of the sensor. This work presents error analysis of a spherical capacitive sensor with a differential structure and explores the dependence of the differential capacitance on manufacturing and the installation imperfectness. Five error sources are examined: the shape of the ball and the capacitive plate, the axial and radial offset of the plate, and the inclined installation of the plate. The mathematical models for calculating the capacitance errors of the spherical capacitive sensor are deduced and validated through a simulation using Ansoft Maxwell. The results show that the measurement accuracy of the spherical capacitive sensor is significantly affected by the shape of plates and ball, the axial offset, and the inclined angle of the plate. In contrast, the effect of the radial offset of the plate is quite small.

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A Blade Tip Timing Method Based on a Microwave Sensor

Cited by 35 publications

References 21 publications

Non-Contact Measurement of Blade Vibration in an Axial Compressor

Non-Contact Measurement of Blade Vibration in an Axial Compressor

Non-Contact Measurement of Blade Vibration in an Axial Compressor

Error Analysis of a Spherical Capacitive Sensor for the Micro-Clearance Detection in Spherical Joints

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