Blind source separation method for mooring rope vibration signals

A vibration signal and blind source separation technology, applied in vibration testing, machine/structural component testing, measuring devices, etc., can solve problems such as the influence of the tether vibration system and the inability to accurately analyze changes, and achieve high parameter identification accuracy, Difficulty reduction, interference suppression effects

Inactive Publication Date: 2019-01-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

During the vibration process of the string, the damping of the tether and the interference of friction will all affect the vibration system of the tether. The output channel of the similar signal is limited, and its changes cannot be accurately analyzed.

Method used

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  • Blind source separation method for mooring rope vibration signals
  • Blind source separation method for mooring rope vibration signals
  • Blind source separation method for mooring rope vibration signals

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Embodiment Construction

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

[0033] The blind source separation method of the tether vibration signal of the present invention comprises the following steps:

[0034] 1. Acquisition of the vibration signal. For the tether vibration (small damping) system, the vibration response signal can be expressed as follows:

[0035]

[0036]

[0037]

[0038] In the formula, ω nj is the natural frequency of the system, ω dj is the natural frequency in the presence of damping, Φ j is the complex mode shape vector, Φ ij is the complex value of the mode shape vector at this point, for Φ ij The complex conjugate of , q j is the modal displacement response, for q j The complex conjugate of σ ij is the phase angle, ξ j is the damping ratio; g ij is the assumed coefficient, the eigenvalue s j and mode shape vector Φ j are conjugate complex values ​​that appear in pairs, α j is a r...

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Abstract

Disclosed is a blind source separation method for mooring rope vibration signals. The blind source separation method comprises the following steps of step 1, selecting any position point on the mooring rope to obtain vibration signals; step 2, carrying out mean-value preprocessing on the collected vibration signals, and performing de-meaning to change observation signals into zero-mean-value vectors; step 3, carrying out whitening treatment on the observation signal data subjected to the de-meaning, so as to remove the correlation between the observation signals; step 4, performing analysis onthe observation signals after the whitening treatment through a blind source separation algorithm to obtain estimation of the mixed matrix and the source signals; and step 5, analyzing the modal response and the vibration type matrix of the mooring rope vibration system according to the estimation of the mixed matrix and the source signals; and adopting a single-mode recognition technology to separate out frequency and damping ratio from the source signal estimation; and ranking the separated signals according to the values, so that the frequency vector, the damping ratio vector and the vibration type matrix of the mooring rope vibration system are obtained. The system parameter identification accuracy is high.

Description

technical field [0001] The invention relates to a tether vibration system analysis method, in particular to a blind source separation method for tether vibration signals. Background technique [0002] In daily life and production, tether structures widely exist, such as the laying of transmission lines, the processing of textile threads, the design of elevator lifting systems and cable-stayed bridges, etc. In the application of tether structure, tether vibration is a ubiquitous phenomenon, and its vibration signal contains many parameters related to the system, such as tension, which is directly related to the reliability of the transmission line, the quality of the textile line, and the elevator and oblique. Pull the bridge for safety. The tether vibration signal is acquired and analyzed to obtain desired parameters. [0003] Vibration signals acquired through sensors (both contact and non-contact) are mostly mixed signals, including noise and useless components, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01M7/02
CPCG01H17/00G01M7/02
Inventor 黄攀峰张海涛孟中杰张夷斋刘正雄张帆董刚奇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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