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Multi-frequency weak signal detecting method for early failure of rotor

A weak signal detection and early failure technology, applied in the electronic field, can solve the problems of limited detection signal-to-noise ratio, single detection signal frequency, and inability to meet the simultaneous detection of multiple characteristic signals, etc., to achieve easy engineering implementation, improve signal-to-noise ratio, The effect of simple method

Inactive Publication Date: 2008-10-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0020] In order to overcome the shortcomings of the prior art detection signal-to-noise ratio is limited, and the frequency of the detection signal is single, which cannot satisfy the simul

Method used

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  • Multi-frequency weak signal detecting method for early failure of rotor
  • Multi-frequency weak signal detecting method for early failure of rotor
  • Multi-frequency weak signal detecting method for early failure of rotor

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Embodiment Construction

[0048] Engineering applications have found that 1 / 3 and 2 / 3 power frequency components exist stably when the rotor system rubs at an early stage, but the amplitude is weak, and it is difficult to detect them under actual working conditions. This embodiment adopts the method described in the present invention to carry out the early-stage collision failure simulation experiment on the rotor with a power frequency of 60 Hz on the aircraft rotor system simulation test bench, and detects whether there are 1 / 3 and 2 / 3 frequency division signals, including the following step:

[0049] Step 1. Determine the frequency ω of the signal to be tested that may contain 1 / 3 and 2 / 3 frequency division signals 1 and ω 2 .

[0050] Step 2: Select the reference signal as

[0051] y(t)=2(cos(ω 1 t)+cos(ω 2 t))

[0052] At this time, the frequency ω of the 1 / 3 frequency division signal 1 =2×π×20 rad / s=40π rad / s, frequency ω of 2 / 3 frequency division signal 2 =2×π×40 rad / s=80π rad / s.

[005...

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Abstract

The invention discloses a multi-frequency weak signal detection method for detecting the failure of a rotor in the early stage. A related method is adopted to conduct prophase noise removal, and a chaotic oscillator array scanning method is adopted to realize simultaneous detection of a plurality of frequency weak signals represented by the same failure, that is, signals with noise are denoised through related calculation, a related function is sent to the chaotic oscillator array and serves as a part of chaotic system periodic driving force, and the weak periodic signal of a signal to be detected can be detected through the change of chaotic system phase locus. The method improves the signal-to-noise ratio of the signal to be detected, and completes the detection of multi-feature weak signal through identifying the state of Duffing oscillator, namely the change of phase locus pattern. Therefore, the method has the advantages of simplicity, intuition, definite physical significance and high detection signal-to-noise ratio. Furthermore, the method is capable of completing the weak signal detection of a plurality of known frequencies and easy for engineering realization, thereby having greater development potential.

Description

technical field [0001] The invention belongs to the field of electronic technology and relates to a method for detecting weak signals. Background technique [0002] Weak signal detection is a science that studies the methods and techniques of extracting information from noise. It is a comprehensive technology and cutting-edge field in measurement technology to study the principle and method of weak signal detection in noise. Using this technology can measure the weak quantities that traditional concepts cannot be measured (such as weak light, small displacement, micro-vibration, etc.), so that the measurement accuracy of weak signals is greatly improved. Therefore, it is an important measurement method for developing high-tech, exploring and discovering new natural laws, and is of great value in promoting the development of science and technology and production. [0003] Weak signal detection technology has applications in various fields related to human beings. For examp...

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Application Information

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IPC IPC(8): G01H17/00
Inventor 郭阳明马捷中翟正军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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