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Harmonic wave component detection method based on frequency spectrum variance

A technology of harmonic components and detection methods, applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as increasing the complexity of parameter identification

Pending Publication Date: 2021-05-11
南京微动智测信息技术有限公司
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  • Claims
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Problems solved by technology

At present, the commonly used frequency domain method is the spectral kurtosis method, which requires additional calculation of the fourth power of the spectrum, which increases the complexity of parameter identification

Method used

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  • Harmonic wave component detection method based on frequency spectrum variance
  • Harmonic wave component detection method based on frequency spectrum variance
  • Harmonic wave component detection method based on frequency spectrum variance

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Embodiment Construction

[0015] Embodiments of the present invention provide a technique for detecting harmonic signals in mechanical structure vibration response by frequency spectrum variance, which can detect pseudo-resonance components caused by periodic excitation forces in the mechanical structure 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 harmonic component detection method based on spectrum variance provided in this embodiment includes the following steps:

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

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

[0020] Step 3: Estimate the time-frequency spectrum of the response signal;

[0021] Step 4: Estimate the variance of the time-spectrum in the time-domain dimension...

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Abstract

The embodiment of the invention discloses a harmonic wave component detection method based on frequency spectrum variance, relates to the field of mechanical structure vibration signal analysis. The method can detect pseudo resonance components generated by periodic excitation force in mechanical structure response so as to improve the reliability of parameter identification. The method comprises the following steps: providing a novel harmonic wave component detection method according to the vibration response characteristics of a mechanical structure in a working state, namely defining and calculating the frequency spectrum variance of vibration response, and indicating the harmonic wave component in the original response based on the numerical value of the frequency spectrum variance. The method is especially suitable for vibration response signal processing and modal parameter identification of a mechanical structure in a working state.

Description

technical field [0001] The invention relates to the field of vibration signal analysis of mechanical structures, in particular to the field of vibration response signal processing and parameter identification of rotating mechanical structures under working conditions. Background technique [0002] Rotating mechanical structures (such as rotors, rotor blades, etc.) 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] Harmonic detection can be divided into time domain and frequency domain methods. Compared with the ti...

Claims

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Application Information

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IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 王彤夏遵平
Owner 南京微动智测信息技术有限公司
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