A Noise Reduction Method for Offshore Platform Vibration Response Based on Extremum-Residue Decomposition

Abstract

The present invention relates to a vibration response denoising method of an offshore platform based on extremum-residue decomposition, including steps such as data truncation, meaningful component selection, extremum-residue low-order state space solution and reconstruction of denoising signals, etc. . This method directly processes the response signal, decomposes the measured data into real components and noise components, selects the extremum and residue of the real components through the spectrum signal, and does not need system information and kernel functions; and for longer data segments, use sliding The window is segmented, and the frequency window is created, and the meaningful components of each segment of the intercepted data are selected according to the amplitude-frequency map, which has high computational efficiency; this method is suitable for denoising and high-level structural response data in engineering. Signal denoising of background noise data has a wide range of engineering applications and application prospects.

Description

technical field [0001] The present invention relates to the field of response signal denoising, in particular to a vibration response denoising method for offshore platforms based on extremum-residue decomposition, aiming at structures such as offshore wind power and offshore platforms under complex marine environmental loads such as wind, waves, and currents. Signal denoising of measured data. Background technique [0002] When testing marine structures, the response signal often contains a lot of environmental noise, which has a great impact on the subsequent processing of the response signal. Traditional signal denoising methods include low-rank approximation algorithm based on Singular Value Decomposition (SVD), wavelet denoising method, and Kalman filter. There are certain limitations. [0003] The low-rank approximation algorithm based on Singular Value Decomposition (SVD) is to decompose the Hankel matrix composed of response data by SVD, and the smaller singular va...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an offshore platform vibration response denoising method based on extremum-residue decomposition for the shortcomings of traditional denoising methods such as SVD decomposition and wavelet decomposition, such as low calculation efficiency and difficulty in selecting wavelet kernel functions. , directly process the response signal without system information and kernel function. For longer data segments, use sliding window segment processing, which has high calculation efficiency and can provide a fast and effective signal denoising for marine structure test signals method

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