Results 221 to 230 of about 976,747 (262)

Long tipping times of a quantum rod

Canadian Journal of Physics, 2006
We calculate the tipping time of a quantum rod that has a height several times that of the edge length of its square base. We use an expression for the tipping time that has heuristic value, and gives the average time at which, upon measurement, the initially balanced rod is found to tip. We use two methods to calculate the tipping time. One method is
Mark B Lundeberg, Mark RA Shegelski
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Optimizing probes positioning in Blade Tip Timing systems

Mechanical Systems and Signal Processing, 2022
Abstract The monitoring of the blades in bladed disk assembly is done via a continuous determination and analysis of the blade dynamics, which is mostly subjected to different type of excitation forces inducing the synchronous and asynchronous vibration of the blades.
Eder Batista Tchawou Tchuisseu, Pavel Procházka, Dušan Maturkanič, Pete Russhard, Marek Brabec   +4 more
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Blade Tip Timing: from Raw Data to Parameters Identification

2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2019
Blade Tip Timing (BTT) methods have been increasingly implemented for blade health monitoring. However, most of them are based on the prior knowledge that the resonance’s location is known. Since real BTT test usually takes more than ten hours, it’s unrealistic to Figure out every resonance from the measured raw data manually.
Shuming Wu, Xuefeng Chen 0002, Pete Russhard, Ruqiang Yan 0001, Shaohua Tian, Shibin Wang, Zhibin Zhao 0002   +6 more
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Adaptive Iterative Approach for Efficient Signal Processing of Blade Tip Timing

IEEE Transactions on Instrumentation and Measurement, 2021
Blade 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, Zhibo Yang 0001, Shuming Wu, Zengkun Wang, Shaohua Tian, Ruqiang Yan 0001, Xuefeng Chen 0002   +6 more
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Blade tip timing (BTT) uncertainties

AIP Conference Proceedings, 2016
Blade 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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An Autocorrelation Method for Asynchronous Vibration Feature Extraction in Blade Tip Timing

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2021
Engine compressor blades play important roles in aeroengine operation. They are easily injured by foreign objects due to direct contact with the outside air. Blade tip timing (BTT) is a non-contacting vibration measurement method for rotating blade health monitoring. However, the under sampled problem is an inevitable obstacle in the feature extraction
Zengkun Wang, Zhibo Yang 0001, Haoqi Li, Shuming Wu, Ruqiang Yan 0001, Shaohua Tian, Xuefeng Chen 0002   +6 more
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Tip-Timing Steam Turbine Rotor Blade Simulator

Journal of Vibration Engineering & Technologies, 2018
The 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, R. Rzadkowsk, P. Troka, P. Piechowski, L. Kubitz, R. Szczepanik   +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), 2021
Foreign 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, Zhibo Yang 0001, Haoqi Li, Zengkun Wang, Shaohua Tian, Ruqiang Yan 0001, Xuefeng Chen 0002   +6 more
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An Improved Multiple Signal Classification for Nonuniform Sampling in Blade Tip Timing

IEEE Transactions on Instrumentation and Measurement, 2020
Blade 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, Zhibo Yang 0001, Shuming Wu, Haoqi Li, Shaohua Tian, Xuefeng Chen 0002   +5 more
openaire   +2 more sources

A Discussion on the Advancement of Blade Tip Timing Data Processing

Volume 7B: Structures and Dynamics, 2017
The 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, Dimitriadis, Grigorios, Defise, Colin   +2 more
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