An Improved Circumferential Fourier Fit (CFF) Method for Blade Tip Timing Measurements
Source abstract
Abstract
Rotating blade vibration measurements are very important for any turbomachinery research and development program. The blade tip timing (BTT) technique uses the time of arrival (ToA) of the blade tip passing the casing mounted probes to give the blade vibration. As a non-contact technique, BTT is necessary for rotating blade vibration measurements. The higher accuracy of amplitude and vibration frequency identification has been pursued since the development of BTT. An improved circumferential Fourier fit (ICFF) method is proposed. In this method, the ToA is not only dependent on the rotating speed and monitoring position, but also on blade vibration. Compared with the traditional circumferential Fourier fit (TCFF) method, this improvement is more consistent with reality. A 12-blade assembly simulator and experimental data were used to evaluate the ICFF performance. The simulated results showed that the ICFF performance is comparable to TCFF in terms of EO identification, except the lower PSR or more number probes that have a more negative effect on ICFF. Besides, the accuracy of amplitude identification is higher for ICFF than TCFF on all test conditions. Meanwhile, the higher accuracy of the reconstruction of ICFF was further verified in all measurement resonance analysis.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Bladed Disk Vibration Dynamics · Structural Health Monitoring Techniques · Advanced Measurement and Detection Methods
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Weijin Road, Tianjin 300072, China
Funding
Equipment Pre-research Field Fund · National Science and Technology Major Project · National Natural Science Foundations of China · National Key Research and Development Plan · Natural Science Foundations of Tianjin City · Science and Technology on Underwater Information and Control Laboratory · 2019 Guangdong Provincial Market Supervision Administration Quality and Safety Supervision Scientific Research Project
References (40)
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