Extraction and monitoring method of half-speed vortex on-line stability characteristics of high-speed rotating machine

A high-speed rotation and feature extraction technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., it can solve problems such as difficult stability state trend analysis, difficulty in obtaining stability parameters, and unpredictable half-speed whirl.

Inactive Publication Date: 2003-02-05
SHAANXI AUTOMOBILE GROUP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: it can only be found when the system is already in an unstable state, it is difficult to perform trend analysis on the stable state, and it is impossible to predict the occurrence of half-speed whirl
However, in the past, this method only obtained stability parameters through theoretical calculation and modal experiments in the design and manufacture of the unit, but for the unit in actual operation, these stability parameters are difficult to obtain, so the current Technically speaking, this method is not yet capable of on-line monitoring of stability

Method used

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  • Extraction and monitoring method of half-speed vortex on-line stability characteristics of high-speed rotating machine
  • Extraction and monitoring method of half-speed vortex on-line stability characteristics of high-speed rotating machine
  • Extraction and monitoring method of half-speed vortex on-line stability characteristics of high-speed rotating machine

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Embodiment

[0048] Take a CO in a petrochemical company 2 Take the centrifugal compressor unit as an example. The unit is equipped with an eddy current sensor produced by Bently Company of the United States, and is equipped with a 7200 series instrument. The vibration displacement signal of the rotor journal can be easily obtained from the output terminal of the instrument. By establishing an online monitoring system, we have followed and monitored the unit for several years. During this period, the unit once had a half-speed eddy fault. Now describe as follows:

[0049] image 3 is the vibration displacement signal output by one of the sensors. The speed of the unit is 12600 RPM , from formula (3), the speed frequency can be calculated as

[0050] f r =12600 / 60=210(Hz) (17)

[0051] Select the sampling interval according to step

[0052] T=1 / 3000 (18) and sample length

[0053] N = 1024 (19) T and N meet the requirements of (2) and (4). Sampling the signal t...

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Abstract

The invention discloses the method for picking-up and monitoring the character of on-line stability of the half speed whirl for the on-the-fly machine. The electric whirl displacement sensor of non-contacted type obtains the vibration displacement signal of the rotator. The vibration displacement signal is preprocessed through the FIR filter technique so as to reserve the component near the half-frequency and filter out other interference component. Then, the RDT techniques pick-up the stability parameter of the system is obtained through the genetic algorithm. The trend map between the stability parameter and time can be drawn out.

Description

[0001] 1. Field [0002] The invention belongs to the field of mechanical fault diagnosis and modal analysis of rotating machinery, and can be further extended to related application fields involving signal analysis and feature extraction, in particular to a method for extracting and monitoring online stability features of half-speed eddy of high-speed rotating machinery. 2. Background technology [0003] Half-speed whirl is a common failure of high-speed rotating machinery. It is a self-excited vibration caused by the fluid dynamics between the rotating shaft and the hydrodynamic lubricated bearing. It is a manifestation of the system's loss of stability (referred to as instability). Under certain conditions, once the system loses stability, the rotor whirl amplitude will increase sharply, causing the unit to vibrate strongly, and the vibration occurs suddenly. In addition, since the half-speed whirl frequency is about half of the rotor rotation frequency (usually between 0.4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/02G01H11/06
Inventor 孟庆丰何正嘉
Owner SHAANXI AUTOMOBILE GROUP
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