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Instantaneous Frequency Estimation Method Based on Simulated Annealing Algorithm

A simulated annealing algorithm and instantaneous frequency technology, which is applied in the field of fault diagnosis and rotating machinery, can solve problems such as the large influence of order ratio and amplitude interference, and achieve the effect of small calculation, fast speed and high precision

Inactive Publication Date: 2018-11-02
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

For example, the adjacent order analysis method of orthogonal compensation matrix combined with discrete Fourier is greatly affected by the change of order amplitude and the degree of interference between adjacent orders.
However, the number of source signals required for independent component analysis to separate signals must not be less than the number of independent components, which makes the adjacent order analysis method of independent component analysis combined with peak search have limitations in actual use.

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  • Instantaneous Frequency Estimation Method Based on Simulated Annealing Algorithm
  • Instantaneous Frequency Estimation Method Based on Simulated Annealing Algorithm
  • Instantaneous Frequency Estimation Method Based on Simulated Annealing Algorithm

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Embodiment Construction

[0032] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Such as figure 1 Shown method flowchart of the present invention, based on the instantaneous frequency estimation method of simulated annealing algorithm, comprises the following steps:

[0034] Step 1. Perform STFT transformation on the collected vibration signal, and obtain the time spectrum diagram of the signal.

[0035] Given a window function with a short time width, the window function intercepts the signal with time, and then performs Fourier transform as shown in formula (1), and then calculates the STFT spectrum according to formula (2), and the STFT spectrum is the time of STFT - frequency energy distribution:

[0036]

[0037] P(t,f)=|S x (t,f)| 2 (2)

[0038] Among them, x(t) is the vibration signal, γ(t) is the window function, * represents the complex conjugate, f is the time variable, and t and τ are equivale...

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Abstract

The invention discloses an instantaneous frequency estimation method based on simulated annealing (SA). The SA is introduced and is combined with short-time Fourier transform (STFT), and an STFT-SA instantaneous frequency estimation algorithm is brought forward. According to the STFT-SA algorithm, by taking a signal time-frequency spectrograph as a basis, through an idea of searching for an optimal path by use of the SA and through combination with the feature of non-stationary signals of rotation machinery, first-order instantaneous frequency extraction of vibration signals of the rotation machinery is realized, and the method has a very good effect on such vibration signals as high noise, adjacent orders and the like.

Description

technical field [0001] The invention belongs to the technical field of rotating machinery and fault diagnosis, and in particular relates to an instantaneous frequency estimation method based on a simulated annealing algorithm. Background technique [0002] Rotating machinery has become an indispensable part of industrial production. In order to ensure the normal operation of rotating machinery, it is particularly important to perform status detection and fault diagnosis on rotating machinery. Vibration signals in the acceleration and deceleration stages of rotating machinery contain rich state information, and it is easier to find system defects that are usually difficult to find when studying this stage. Therefore, being able to effectively extract the fault features at this stage is an important link in the fault diagnosis of rotating machinery and is of great significance to the normal operation of rotating machinery. [0003] In order to better understand the fault info...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 张永宏谢阳阳王丽华赵晓平陶润喆
Owner NANJING UNIV OF INFORMATION SCI & TECH