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Surge symptom identification method based on frequency band energy

An identification method and energy technology, applied in the direction of liquid variable displacement machinery, pump control, pump testing, etc., can solve the problems of lack of objectivity and achieve the effect of ensuring real-time performance

Inactive Publication Date: 2010-06-02
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

Among them, the transition section and the surge section correspond to the occurrence and development period of the surge. Effectively capturing these two sections of signals is of great significance for determining the frequency band of surge monitoring. The oscillation amplitude and empirical judgment of the pressure signal lack objectivity

Method used

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  • Surge symptom identification method based on frequency band energy
  • Surge symptom identification method based on frequency band energy
  • Surge symptom identification method based on frequency band energy

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The identification method of the invention reflects the unsteady energy disturbance in the cavity of the compression system by monitoring the change of frequency band energy, so as to realize the precursory identification and early warning of surge. Firstly, the historical data of the compressor is analyzed step by step to refine the spectrum, and the characteristic frequency band of the compressor is obtained, and then the energy of the characteristic frequency band is calculated with the change curve of the compressor running time, and the threshold of the surge precursor is determined. The premonitory threshold analyzes the real-time data of the compressor to realize the premonitory identification of surge.

[0033] Such as figure 1 As shown, the identification method of the present invention is carried out in the following steps: ...

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Abstract

The invention relates to a surge symptom identification method based on frequency band energy, which comprises the following steps of: segmenting a pressure time domain signal into continuously changing time slices by using a sliding window statistic method, locally detailing fine spectrum analysis by adopting a continuous Fourier transform so as to detail each stage of data of historical pressure signal surge symptom of a compressor pipe network; in a sensitive frequency band, inserting n-2 points at equal internals to divide the sensitive frequency band into n networks; then computing the amplitude of each fine frequency point by adopting the continuous Fourier transform, computing and monitoring sensitive frequency band energy; drawing a frequency band energy monitoring curve according to the frequency band energy obtained by the computation, setting an alarming threshold according the increase stage of the amplitudes of the monitoring curve, and realizing the surge symptom identification of real-time data of a compressor. The method reflects unstable energy disturbance in a containing cavity of a compression system through monitoring the change of the frequency band energy, and realizes the early-stage identification and the early warning of the surge symptoms.

Description

technical field [0001] The invention belongs to the technical field of equipment state monitoring and diagnosis, and relates to a real-time monitoring technology of a compressor operating state, in particular to a method for identifying a surge precursor based on frequency band energy. Background technique [0002] The dynamic and continuous development and change of the surge process of the compressor makes the surge early warning technology of the compressor a difficult problem in the state monitoring technology of the compressor. The current on-line compressor monitoring technology with signal processing technology as the core is difficult to capture and detect sudden features and weak changes in the early stage of surge due to the limitation of nonlinear characteristics. Both experimental research and numerical simulation show that, according to the accumulation degree of unsteady disturbance energy that induces surge, the development process of surge can usually be divi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/00F04B51/00
Inventor 徐光华孙涛张熠卓张庆
Owner XI AN JIAOTONG UNIV
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