Method for correcting blade tip timing parameter identification error caused by frequency sweep rate
A technology of parameter identification and blade tip timing, which is applied in complex mathematical operations, testing of mechanical components, and testing of machine/structural components, can solve problems such as large deviations between vibration signal envelopes and amplitude-frequency response curves, and achieve The effect of high-precision identification
Pending Publication Date: 2022-07-29
TIANJIN UNIV
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Problems solved by technology
Excessive frequency sweep rate will cause a large deviation between the actual vibration signal envelope and the amplitude-frequency response curve, and when using the single parameter method to identify the blade vibration parameter identification, a large error will occur
How to reduce the identification error of blade tip timing parameters caused by frequency sweep rate and realize high-precision identification of blade vibration parameters is a problem to be solved in the prior art
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[0029] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
[0030] First, some parameters and background knowledge are explained.
[0031] Frequency sweep rate, that is, rotational speed acceleration of rotating machinery; blade tip timing, using several blade tip timing (BTT) sensors installed on the casing and one rotational speed synchronization (OPR) sensor installed on the shaft to measure the blade resonance parameters; Parameter identification, using the one-parameter method [1-2] Identify the blade resonance parameters; error correction, using the correction formula to correct the parameter identification error of the single-parameter method.
[0032] In order to realize the correction of the blade tip timing parameter identification error caused by the frequency sweep rate, the dimensionless frequency sweep parameter η and the frequency sweep response characteristic functions A(η), f(η), ζ(η) are intro...
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The invention relates to a method for correcting a blade tip timing parameter identification error caused by a frequency sweep rate, which is used for carrying out error correction on a parameter identification method for identifying a blade resonance parameter by using a single parameter method and comprises the following steps of: acquiring a rotor rotation acceleration during variable-speed frequency sweep; identifying synchronous vibration parameters of the blade by utilizing a single parameter method, wherein the synchronous vibration parameters comprise sweep frequency response peak amplitude Aswep, sweep frequency response peak frequency fswep and sweep frequency response quality factor Qswep; solving a dimensionless frequency sweeping parameter eta value by using an iteration method; calculating values of a peak amplitude fraction A (eta), a normalized frequency error f (eta) and a damping ratio fraction zeta (eta); and calculating the peak amplitude, the peak frequency and the quality factor of the blade after error correction.
Description
technical field [0001] The invention relates to a method for correcting an identification error of a blade tip timing parameter caused by a frequency sweep rate. Background technique [0002] Blade vibration monitoring is very important to ensure the normal operation of rotating machinery, and blade tip timing is an effective rotating blade vibration measurement technology. Using blade tip timing, blade vibration event identification and fault diagnosis can be achieved. Compared with traditional strain gage measurement, blade tip timing has the advantages of non-contact, low intervention, and full blade measurement. However, blade tip timing is an under-sampling measurement method. How to reconstruct blade vibration information from under-sampled signals and identify blade vibration parameters is the research hotspot and difficulty of blade tip timing. The main methods of blade vibration parameter identification using blade tip timing data include circumferential Fourier f...
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IPC IPC(8): G01H17/00G01M13/00G06F17/15
CPCG01H17/00G01M13/00G06F17/15Y02E10/72
Inventor 段发阶支烽耀牛广越邓震宇蒋佳佳刘志博
Owner TIANJIN UNIV