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Method for testing stochastic resonance-chaotic weak signal

A weak signal detection and stochastic resonance technology, which is used in the testing of mechanical components, the testing of machine/structural components, measuring devices, etc., and can solve the problem of inability to estimate the amplitude of the signal.

Inactive Publication Date: 2009-10-21
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the stochastic resonance technology cannot estimate the signal amplitude in the actual detection of weak characteristic frequency signals, and to provide a condition of low signal-to-noise ratio, which can quickly and accurately determine the presence or absence of characteristic frequency signals, and can Weak signal detection method for estimating its amplitude

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  • Method for testing stochastic resonance-chaotic weak signal
  • Method for testing stochastic resonance-chaotic weak signal
  • Method for testing stochastic resonance-chaotic weak signal

Examples

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Embodiment Construction

[0034] A specific example is used below to illustrate the specific process and beneficial effect of the present invention for weak signal detection:

[0035] Rubbing of moving and static parts is a common type of fault phenomenon in the rotor system that is difficult to detect and capture. It mainly occurs in the dynamic and static blade seals, rotor shaft seals and sliding bearings of the unit. Rubbing occurs for a short time and sometimes the location is uncertain. If rubbing occurs frequently, it may cause other serious failures and cause major economic losses. Therefore, trying to detect the rubbing fault of the rotor system at an early stage has practical significance for avoiding rubbing and secondary faults of the rotor system and for the healthy operation of the unit.

[0036] Through experimental research on the vibration characteristics of the rotor system when there is sharp rubbing between the dynamic and static parts, it can be known that in the early stage of ru...

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Abstract

The invention discloses a method for testing stochastic resonance-chaotic weak signal, comprising the following steps: firstly, testing whether a frequency signal with weak feature exists by means of self-adapting parameter adjusting stochastic resonance to obtain the magnitude of the most probable signal-to-noise ratio of the signal which is practically to be tested; on the basis, designing a corresponding duffing chaotic vibrator and computing conversion relationship between the input period encouragement of the chaotic vibrator and the output large magnitude periodic motion magnitude under the condition of different signal-to-noise ratio; and finally estimating to obtain the magnitude of the frequency signal with weak feature according to the magnitude of the signal which is practically to be tested by means of stochastic resonance. The method is applicable to test the frequency signal with weak feature in the early detection fields such as physics, chemistry, biology, mechanical failure, and the like, under the condition of low signal-to-noise ratio.

Description

technical field [0001] The invention relates to a weak signal detection method under the background of strong noise, which is especially suitable for comprehensive detection of whether relevant faults occur and the degree of occurrence in early fault diagnosis of mechanical systems under the condition of low signal-to-noise ratio. Background technique [0002] Stochastic resonance technology was proposed by Italian scholars Baz and others in the 1980s when they were studying the changes in the earth's ancient climate. Stochastic resonance uses noise to enhance the mechanism of weak signal transmission, which makes it have unique advantages compared with other weak signal detection methods, so it has been widely valued in the fields of biological signal processing, visual image and auditory recognition, electromagnetic system and optical signal processing. Studies have shown that the existence of weak characteristic frequency signals can be effectively detected by using the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01M13/00
Inventor 胡茑庆陈敏秦国军潘中银
Owner NAT UNIV OF DEFENSE TECH
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