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Blade tip timing (BTT) uncertainties
AIP Conference Proceedings, 2016Blade Tip Timing (BTT) is an alternative technique for characterising blade vibration in which non-contact timing probes (e.g. capacitance or optical probes), typically mounted on the engine casing (figure 1), and are used to measure the time at which a blade passes each probe.
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Adaptive Iterative Approach for Efficient Signal Processing of Blade Tip Timing
IEEE Transactions on Instrumentation and Measurement, 2021Blade health monitoring (BHM) is an important technology to ensure safe operation of turbine machinery. The blade tip timing (BTT) method is a non-contact approach of vibration monitoring that is widely used for aero-engines. A BTT signal can be characterized as nonuniform and sub-Nyquist sampled (i.e., under-sampled).
Haoqi Li +6 more
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Tip-Timing Steam Turbine Rotor Blade Simulator
Journal of Vibration Engineering & Technologies, 2018The traditional method of experimentally determining bladed disc vibration is with the use of strain gauges. The disadvantage of this method is the fact that only a few rotor stage blades can be measured, i.e. vibration data are limited to only a few blades.
L. Piechowski +5 more
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A Virtual Blade Tip Timing Measurement Method for Foreign Object Damage
2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2021Foreign object damage (FOD) is a frequent but dangerous failure of the compressor. Blade tip timing (BTT) is regarded as a promising on-line monitoring method for blades, but it is difficult to obtain the real FOD data in a laboratory environment. This paper proposes a virtual BTT measuremnt method for FOD.
Shuming Wu +6 more
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An Improved Multiple Signal Classification for Nonuniform Sampling in Blade Tip Timing
IEEE Transactions on Instrumentation and Measurement, 2020Blade tip timing (BTT) is an effective noncontact measurement technology for rotating blade health monitoring. However, due to the mismatching between the high-speed rotation and the limited amount of probes, the signal collected from the BTT system is severely undersampled, which induces the difficulty in feature extraction.
Zengkun Wang +5 more
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A Discussion on the Advancement of Blade Tip Timing Data Processing
Volume 7B: Structures and Dynamics, 2017The Blade Tip Timing method (BTT) is a well-known approach permitting individual blade vibration behavior characterization. The technique is becoming increasingly popular among turbomachinery vibration specialists. Its advantages include its non-intrusive nature and its capability of being used for long-term monitoring, both in on-line and offline ...
Kharyton, Vsevolod +2 more
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Hepatic encephalopathy after TIPS: time to improve the classification?
2016Purpose: Hepatic encephalopathy (HE) remains a significant problem after TIPS placement and represents an important drawback of this otherwise valuable and life- prolonging intervention.
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Tipping time in a stochastic Leslie predator–prey model
Chaos, Solitons & Fractals, 2023Anji Yang, Hao Wang, Sanling Yuan
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Practical Application of ARMA Model Method for Blade Tip Timing
Volume 4: Controls, Diagnostics, and InstrumentationAbstract Blade tip timing (BTT) is a non-contact measurement technology for rotating blade vibration. However, BTT often has nonuniform undersampling. Building a response mode is an efficient method for BTT signal analysis. The autoregressive moving-average (ARMA) model is famous for modelling a linear stationary time series in discrete ...
Pengfei Chai +5 more
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