Harmonic window function of vibration signal processing

A vibration signal and window function technology, which is applied in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems such as the reduction of the fineness of the analysis of dense characteristic signals and the lack of self-adaptability of wavelet analysis.

Inactive Publication Date: 2010-05-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

But the wavelet analysis is not adaptive, once the wavelet is selected, it must be used to analyze all the data to be analyzed
At the same time, with the increase of the number of decomposition layers, due to the binary wavelet decomposition characteristic of extracting one from two, the analysis precision of dense characteristic signals is greatly reduced (Li Shunming et al. Wavelet analysis of vibration signals of driving vehicles, Automotive Engineering, 1997.19(6): 370 -375)

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  • Harmonic window function of vibration signal processing
  • Harmonic window function of vibration signal processing
  • Harmonic window function of vibration signal processing

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[0043] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0044] Such as figure 1 , figure 2 As shown, Figure a is the indication diagram of Hanning window in time domain, Figure b is the indication diagram of Hanning window in frequency domain, Figure c is the indication diagram of time domain of harmonic window, and Figure d is the indication diagram of frequency domain of harmonic window.

[0045] Such as image 3 Shown, the present invention comprises the steps:

[0046] Step 101, harmonic wavelet function construction

[0047] The wavelet transform and the wavelet packet transform in the usual sense (also required for implementation) use interval sampling, that is, two sampling and one sampling. In a mathematical sense, this embodies the "binary" nature. The reason why the interval sampling is used is to compress the data encoding. Although this achieves the purpose of no redundant storage and can reconstruct ...

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Abstract

The invention discloses a harmonic window function of vibration signal processing, and constructs the harmonic window function with adaptive window functions by means of a harmonic wavelet basic function. The method realizes window analysis of vibration signals better without reducing information points, and the harmonic window function has lower time-domain and frequency-domain leakage than other original window functions due to the characteristic of compact support. The method has a flexible time-domain analysis window and centering control and can select any interested frequency band to carry out analysis. The scheme can accurately detect and analyze complex vibration signals.

Description

technical field [0001] The invention relates to a signal post-processing technology, which belongs to a new complex vibration signal processing method, and is suitable for windowing analysis of complex vibration signals. Background technique [0002] Most modern complex vibration signals are characterized by non-stationary and strong noise. The analysis of vibration signals refers to extracting useful signals from noise, studying signal characteristics, and further determining the current state of the tested structure. The non-stationarity of complex vibration signals (such as existing in crack fault diagnosis) increases the difficulty of effective diagnosis of structural faults, and the strong noise environment drowns out many useful signals. Therefore, to determine the dynamic fault characteristics of the structure, more effective signal analysis methods need to be studied. At present, some achievements have been made in theory and application in the analysis of complex ...

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Application Information

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IPC IPC(8): G01H17/00
Inventor 李舜酩张袁元雷衍斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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