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Signal transient element sparse representation detection method and device and failure detection method

A technology of transient components and detection methods, which is used in measurement devices, testing of mechanical components, testing of machine/structural components, etc., can solve problems such as low accuracy, difficult detection, and included noise, and achieves low sensitivity to noise. , weak fault feature detection, the result is concise effect

Inactive Publication Date: 2014-07-30
SUZHOU UNIV
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Problems solved by technology

Due to the large amount of noise in the signal obtained during the acquisition process, the transient components of the signal to be detected will be polluted by noise, so the detection of transient features under strong noise background has always been a difficult problem in signal detection
[0003] The most common transient component detection method is to directly judge whether there is a transient component in the time domain signal, but because the transient component in the signal is often mixed with a lot of noise, the accuracy of the process of directly detecting the transient component in the signal is low , the efficiency is also lower

Method used

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  • Signal transient element sparse representation detection method and device and failure detection method
  • Signal transient element sparse representation detection method and device and failure detection method
  • Signal transient element sparse representation detection method and device and failure detection method

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Embodiment

[0147] Example: a gear broken tooth fault detection

[0148] If a tooth of the gear is broken, there will be a transient impact component in the vibration signal, and the transient impact component is loaded into the noise and the meshing frequency of the gear. Signal detection is required to clearly indicate the fault characteristics.

[0149] The test object is the detection of the failure of the third gear meshing gear of a certain automobile transmission, which can be referred to together Figure 5 , Figure 5 It is a schematic diagram of the internal transmission structure of the gear box in the embodiment. It is understandable that a piezoelectric acceleration sensor is installed on the housing of the transmission during the test to pick up the vibration acceleration signal. The vibration acceleration signal is collected and stored by the computer after the piezoelectric acceleration sensor and the charge amplifier.

[0150] Refer to Table 1. Table 1 shows the parameters of th...

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Abstract

The invention discloses a signal transient element sparse representation detection method and device. The signal transient element sparse representation detection method comprises the steps that input signals are subjected to analog / digital conversion to obtain detection signals; the optimal wavelet atomic library and the minimum optimization equation are set up for the detection signals; an optimization iteration method is set up to solve the minimum optimization equation according to the optimal wavelet atomic library, and the sparse representation coefficient of the detection signals on the optimal wavelet atomic library is determined; according to the sparse representation coefficient, the time of occurrence of the transient elements in the detection signals is determined; according to the time of occurrence of transient elements in the detection signals, the cycle of the transient elements in the detection signals which contain periodic transient elements is determined. The method is used for detecting and extracting the transient elements in the signals, the result representation is concise, and noise sensitivity is low.

Description

Technical field [0001] The invention relates to the field of signal analysis and detection, in particular to a detection method and device for sparse representation of transient components in a signal, and a fault detection method, which can be used for fault diagnosis and state monitoring of mechanical equipment and detection of biomedical signals. Background technique [0002] At present, the detection of transient components in signals has a wide range of applications in the fields of fault diagnosis and condition monitoring of mechanical equipment, and biomedical signal detection. Due to the large amount of noise in the signal obtained in the acquisition process, the transient component of the signal to be detected will be contaminated by noise. Therefore, the detection of transient features under the background of strong noise has always been a problem in signal detection. [0003] The most common method for detecting transient components is to directly judge whether there are...

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Application Information

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IPC IPC(8): G01H17/00G01M13/00G01M13/02
Inventor 李成樊薇张润涵李双蔡改改黄伟国朱忠奎
Owner SUZHOU UNIV
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