Offshore platform vibration response de-noising method based on extremum-residue decomposition

Abstract

The invention relates to an offshore platform vibration response de-noising method based on extremum-residue decomposition, which includes the steps of data interception, meaningful component selection, extremum-residue low-order state space solving, de-noising signal reconstruction, and the like. A response signal is directly processed, measured data is decomposed into a real component and a noise component, the extremum and residue of the real component are selected through a spectrum signal, and there is no need for system information or kernel function. For a long data segment, the data segment is processed section by section using a sliding window, a frequency window is created, the meaningful component of each section of data is selected according to an amplitude frequency diagram, and high computational efficiency is achieved. The method is suitable for the de-noising of response data of the majority of structures in engineering and the signal de-noising of high background noisedata, and has a wide engineering application range and a good application prospect.

Description

technical field [0001] The present invention relates to the field of response signal denoising, in particular to an offshore platform vibration response denoising method based on extremum-residue decomposition. 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 value corresponds to the noise component, which is set to zero to achieve the purpose of noise elimination. Small signal denoising effect is ideal; but w...

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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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