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Harmonic component detection method based on enhanced spectrum kurtosis

A technology for harmonic components and detection methods, which is applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of calculation redundancy, limit the detection accuracy of adjacent frequency components, and incomplete utilization of data and information, and improve reliability. sexual effect

Active Publication Date: 2016-12-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

For the structural vibration response data collected by multiple channels, the above detection methods need to calculate the data of each channel one by one, which has the disadvantages of redundant calculation and incomplete utilization of data information.
In addition, the above method also requires the use of digital narrowband filters, which limits the detection accuracy for adjacent frequency components

Method used

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  • Harmonic component detection method based on enhanced spectrum kurtosis
  • Harmonic component detection method based on enhanced spectrum kurtosis
  • Harmonic component detection method based on enhanced spectrum kurtosis

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Embodiment Construction

[0015] The embodiment of the present invention provides a technology for detecting harmonic signals in the vibration response of mechanical structures using enhanced spectral kurtosis, which can detect the pseudo-resonant components caused by periodic excitation forces in the vibration system, thereby improving the reliability of system parameter identification .

[0016] To achieve the above object, the implementation of the present invention adopts the following steps:

[0017] In the first aspect, the method provided by the embodiments of the present invention includes: the following steps

[0018] Step 1: Import the time-domain signals collected by all channels;

[0019] Step 2: Set the number of analytical spectral lines and the anti-power leakage window function;

[0020] Step 3: Estimating the power spectrum matrix of the multi-channel time-domain data;

[0021] Step 4: Perform singular value decomposition of the power spectrum matrix on each spectral line to obtain ...

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Abstract

The embodiment of the invention discloses a harmonic component detection method based on enhanced spectrum kurtosis, and relates to the field of vibration signal processing and system parameter recognition. The method can detect a pseudo resonance component generated by a periodic excitation force in a vibration system, thereby improving the recognition reliability of system parameters. The method comprises the steps: proposing the enhanced harmonic component detection method according to the multichannel vibration response conditions, i.e., comprehensively considering all vibration response information in each calculation; and calculating the enhanced spectrum kurtosis corresponding to different resonance peaks based on the resonance peaks. The method is suitable for the processing of a vibration signal of a mechanical structure system in a working state.

Description

technical field [0001] The invention relates to the fields of vibration signal analysis and system parameter identification, in particular to the field of vibration signal analysis of mechanical structures under working conditions. Background technique [0002] In the work of mechanical structures, they are usually excited by periodic forces. These cyclic forces, which may be caused by unbalanced rotors, gear trains, or cyclic aerodynamic forces, introduce harmonic components into the response of the mechanical structure. These harmonic components often appear as spurious formants to disturb the identification of real structural dynamic parameters. Therefore, the detection of harmonic components of the mechanical structure response is a prerequisite for the correct identification of dynamic parameters. [0003] Traditional harmonic detection methods include methods based on probability density statistics, methods based on time-domain kurtosis, and methods based on spectral...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 王彤夏遵平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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