A novel OPR-free method for blade tip timing based on adaptive variable reference blades

Zhou, Kai; Qiao, Baijie; Liu, Meiru; Gao, Weiqiang; Dai, Jiangbo; Chen, Xuefeng

doi:10.1016/j.ast.2023.108708

Aerospace Science and Technology

2023

DOI: 10.1016/j.ast.2023.108708

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A novel OPR-free method for blade tip timing based on adaptive variable reference blades

Kai Zhou,

Baijie Qiao,

Meiru Liu

et al.

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2024

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Cited by 3 publications

References 30 publications

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Improved non-contact vibration measurement via acceleration-based blade tip timing

Zhu,

Qiao,

Wang

et al. 2024

Aerospace Science and Technology

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Improved non-contact vibration measurement via acceleration-based blade tip timing

Zhu,

Qiao,

Wang

et al. 2024

Aerospace Science and Technology

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Single-sensor rotating blade monitoring method under non-stationary conditions based on velocity and displacement

Bian,

Yang,

Guan

et al. 2024

ISA Transactions

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A Keyphasor-Free Traveling Waves Analysis Method Based on Blade Tip Timing and Experimental Validation

Meng,

Xiao,

Chai

et al. 2024

Journal of Engineering for Gas Turbines and Power

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Blade Tip Timing (BTT) emerges as a non-intrusive, promising method for assessing blade vibration. Despite its potential, BTT's inherent measurement limitations often result in the under-sampling of individual blade data. Assuming that the bladed-disk assembly vibrates in nodal diameter modes, traveling wave analysis (TWA) can overcome the limitations of under-sampling and identify the nodal diameter modes. Traditional TWA methods rely on a keyphasor or once-per-revolution (OPR) sensor to provide shaft reference signals. However, such a sensor could be damaged during operation or challenging to install due to limited space. In this paper, a new keyphasor-free TWA (KF-TWA) method is introduced, which is capable of measuring the order and nodal diameter of nodal diameter vibrations with as few as two sensors. Theoretical derivations reveal the method's resilience to the steady-state displacement of blades. The feasibility and effectiveness of the KF-TWA method are validated through numerical experiments and compressor tests. In the numerical experiments, blade detuning and nodal diameter vibration responses are simulated, leading to the development of a criterion for identifying nodal diameter vibrations. A compressor test rig, equipped with a 64-keyphasor disk and a sufficient number of circumferentially distributed sensors, is designed to provide blade vibration benchmark. In the experiments, the KF-TWA method successfully identified nodal diameter vibrations with amplitudes as low as 0.014 mm, consistently yielding identical results across multiple sensor pairs, which demonstrates a higher robustness compared to the traditional TWA method.

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A novel OPR-free method for blade tip timing based on adaptive variable reference blades

Cited by 3 publications

References 30 publications

Improved non-contact vibration measurement via acceleration-based blade tip timing

Improved non-contact vibration measurement via acceleration-based blade tip timing

Single-sensor rotating blade monitoring method under non-stationary conditions based on velocity and displacement

A Keyphasor-Free Traveling Waves Analysis Method Based on Blade Tip Timing and Experimental Validation

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