Variable-period integrated signal damping ratio diagnosis method

Abstract

The invention discloses a variable-period integrated signal damping ratio diagnosis method, which comprises the steps of firstly using a data acquisition instrument to acquire vibrating signals, inputting the vibrating signals into a computer for analysis, recognizing the intrinsic frequency of the signals through a non-prior base strategy, then establishing a constructor function through the intrinsic frequency, changing the time duration of signal analysis, performing double integration to the product of the signals and the constructor function, wherein the time duration of the double integration is in a twofold relation and is integer multiples of signal half period, and finally performing simultaneous two-section integration to obtain an equation to be solved, figuring out a signal attenuation coefficient, obtaining signal damping ratio through a relationship calculation formula of the attenuation coefficient, the intrinsic frequency and the damping ratio, and outputting a diagnosis result. The variable-period integrated signal damping ratio diagnosis method has the advantages that the diagnosis speed is fast, the influence of negative frequency items on damping diagnosis is eliminated through variable-period integration during calculation, the accuracy of the diagnosis result is high, the diagnosis process is not restricted by the magnitude of the damping value and the engineering application value is very great.

Description

technical field [0001] The invention relates to the field of vibration signal processing, in particular to a diagnosis method for the damping ratio of integral signals with variable time intervals. Background technique [0002] Damping is one of the important characteristic parameters in terms of vibration reduction and noise reduction. It is of great significance in structural dynamics research such as structural fault diagnosis, safety assessment, structural design, and real-time vibration monitoring. Diagnosing accurate damping values ​​can play an important role in establishing accurate structural models; diagnosing accurate damping values ​​can reasonably construct various responses in structural vibration and improve the reliability of structural dynamic analysis results; diagnosing accurate damping values, The change of damping can be accurately expressed, so as a commonly used important parameter, it can be applied to the field of engineering fault diagnosis such as ...

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Problems solved by technology

[0003] At present, the most commonly used method for damping diagnosis is half power bandwidth method, but this method is significantly affected by frequency resolution, time domain truncation and noise, especially in the diagnosis process of small damping system, the error of diagnosis result is very large, and in mechanical In the field of engineering, most systems constructed of metal materials are small damping systems

Although the newly-appeared inner product method for diagnostic signal damping has hig

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