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A Method for Detection of Weak Fault Signals of Rotating Machinery

A technology for rotating machinery and fault signals, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc.

Active Publication Date: 2020-03-27
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the influence of stochastic resonance parameters on the denoising effect still needs to be further studied.

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  • A Method for Detection of Weak Fault Signals of Rotating Machinery
  • A Method for Detection of Weak Fault Signals of Rotating Machinery
  • A Method for Detection of Weak Fault Signals of Rotating Machinery

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Embodiment Construction

[0067] The present invention will be described in detail below according to the accompanying drawings and specific embodiments.

[0068] The present invention is a method for detecting weak fault signals of rotating machinery, such as figure 1 shown, follow the steps below:

[0069] Step 1, use the vibration sensor to collect the fault vibration signal and the normal vibration signal of the rotating machinery bearing;

[0070] Step 2, perform variational modal decomposition on the fault vibration signal collected in step 1 to obtain variable modal components in different frequency bands;

[0071] Step 2.1, set the fault vibration signal collected in step 1 to be decomposed into variable mode components with the smallest sum of K bandwidths, and each variable mode component can be expressed as a frequency modulation-amplitude modulation modal function u k (t), requiring K modal functions u k The sum of the bandwidths of (t) is the smallest, and the K modal functions u k The...

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Abstract

The invention relates to a rotating machinery weak fault signal detection method, which comprises the following steps: 1) collecting a rotating machinery bearing fault vibration signal through a vibration sensor; 2) carrying out variational modal decomposition on the collected fault vibration signal to obtain a plurality of different frequency bands of variable modal components; 3) obtaining a sensitivity coefficient of each modal component obtained in the step 2) through a mutual-information model, and selecting the modal component corresponding to the larger sensitivity coefficient as a sensitive component of the fault vibration signal; and 4) carrying out spectral analysis on each modal component obtained after variational modal decomposition and screening to find out fault characteristic frequency of the rotating machinery, and finishing diagnosis of vibration fault of the rotating machinery. The rotating machinery weak fault signal detection method can accurately obtain the weak fault signal of the rotating machinery.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis methods, and relates to a method for detecting weak fault signals of rotating machinery, in particular to a method for detecting weak fault signals of rotating machinery based on variational modal decomposition and sensitivity coefficients. Background technique [0002] Rotating machinery is a key component of many large mechanical equipment, such as steam turbine units, hydraulic turbine units and pump station units. Due to the complex operating conditions of mechanical equipment, various faults often occur in rotating machinery, which affects the safe operation of the equipment, and in extreme cases even leads to serious accidents involving machine destruction and death, resulting in huge economic losses. In order to ensure the safe and reliable operation of the equipment and prevent the occurrence of faults, the equipment condition monitoring and fault diagnosis technology needs to have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01M13/045
CPCG01M13/00G01M13/045
Inventor 贾嵘马富齐武桦党建赵佳佳
Owner XIAN UNIV OF TECH