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Compressor surge fault diagnosis method based on acoustic signals

A diagnostic method and fault diagnosis technology, applied in mechanical equipment, machine/engine, pump control, etc., can solve problems such as dwelling acoustic phenomenon, surge fault diagnosis without acoustic signal, etc., and achieve great practical engineering application value and good economic benefits , the effect of accurate diagnosis

Inactive Publication Date: 2020-03-27
AECC SICHUAN GAS TURBINE RES INST
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Problems solved by technology

[0004] In view of the low-frequency noise that is obviously different from the normal working state when the compressor surge fault occurs, some scientific researchers have conducted related research on the noise characteristics in the surge state, but they only stay at the acoustics in the surge state. Phenomena research, there is no relevant research work on the application of acoustic signals for surge fault diagnosis

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  • Compressor surge fault diagnosis method based on acoustic signals
  • Compressor surge fault diagnosis method based on acoustic signals
  • Compressor surge fault diagnosis method based on acoustic signals

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Embodiment Construction

[0023] The present invention will be further explained below in conjunction with the drawings

[0024] Such as figure 1 Shown is a flowchart of a method for diagnosing compressor surge faults based on acoustic signals provided by the present invention. The method steps are as follows:

[0025] (1): Install a sound pressure sensor on the compressor casing;

[0026] The sound pressure sensor is a capacitive sound pressure sensor, which has a better dynamic response than other sensors. The lower limit of the selected sensor's dynamic range should be less than 20Hz. The installation position of the sensor is selected as the box wall of the compressor inlet section. The installation method is flush installation on the wall of the compressor inlet casing, and the sensor needs to be statically calibrated before installation.

[0027] After the installation is complete, check whether the test signal has 50Hz and high-frequency electrical signal interference, and try to eliminate it if necessa...

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Abstract

The invention provides a compressor surge fault diagnosis method based on acoustic signals. The compressor surge fault diagnosis method includes the following steps that (1), a sound pressure sensor is installed on a compressor casing; (2), signals obtained by the sound pressure sensor are subjected to filtering and energy spectrum analysis; (3), the energy ratio calculating is carried out on analysis results; and (4), threshold judgment is carried out, and determining signals are output. According to the compressor surge fault diagnosis method and the low frequency acoustic characteristic phenomenon at the time of compressor surge occurring, the acoustic signals at the time of compressor surge occurring are captured by using an acoustic testing method, and a calculation method of energy ratio is used to successfully implement accurate diagnosis of compressor surge faults. The compressor surge fault diagnosis method can be applied to the on-line diagnosis of the compressor surge faults, is simple in testing and accurate in diagnosis, can be popularized and applied on compressors, and has good economic benefits and great practical engineering application value.

Description

Technical field [0001] The invention belongs to the field of acoustic measurement and signal processing, and specifically relates to a compressor surge fault diagnosis method based on acoustic signals Background technique [0002] Compressor (vane compressor) is one of the main components of gas turbines and aero engines. Its function is to increase the pressure of the airflow by adding work to the airflow under the condition of low flow resistance loss. Regarding the working stability of compressors, a large number of scientific researchers have long been extensively studied. Its unstable working conditions mainly include rotating stall, surge and flutter, etc. Among them, the unstable working state of surge is more popular. One of the research objects. [0003] The phenomenon and mechanism of surge faults have been relatively clear. How to realize rapid diagnosis of compressor surge faults in engineering applications to protect compressor components is a key part of surge fault ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
CPCF04D27/001
Inventor 文璧杜军刘元是
Owner AECC SICHUAN GAS TURBINE RES INST
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