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Transient component sparse representation detection method and device in signal, fault detection method

A technology of transient components and detection methods, applied in the direction of measuring devices, testing of mechanical components, testing of machine/structural components, etc., can solve problems such as low accuracy, mixed noise, and difficult detection, and achieve weak fault feature detection, Effects of less sensitivity to noise and less noise sensitivity

Inactive Publication Date: 2016-08-24
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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  • Transient component sparse representation detection method and device in signal, fault detection method
  • Transient component sparse representation detection method and device in signal, fault detection method
  • Transient component sparse representation detection method and device in signal, fault detection method

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Embodiment

[0147] Embodiment: A gear broken tooth fault detection

[0148] If a tooth of the gear breaks, there will be a transient impact component in the vibration signal, and the transient impact component will be loaded in 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 third-gear meshing gear failure of an automobile transmission, which can be referred to together Figure 5 , Figure 5 It is a schematic diagram of the internal transmission structure of the gearbox in the embodiment. It can be understood that, during the test, a piezoelectric acceleration sensor is installed on the casing of the transmission to pick up vibration acceleration signals. The vibration acceleration signal is collected and stored by the computer after passing through the piezoelectric acceleration sensor and the charge amplifier.

[0150] Refer to Table 1, Table 1 shows the param...

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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 analysis and detection of signals, in particular to a detection method and device for sparse representation of transient components in signals, 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 status monitoring of mechanical equipment, and biomedical signal detection. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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