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Heaving acceleration-based semi-submersible type ocean platform heaving motion parameter forecasting method

An ocean platform and semi-submersible technology, applied in the field of heave motion, can solve problems such as poor estimation accuracy and information loss, and achieve the effects of avoiding error problems, high practical application value, high calculation accuracy and practicability

Active Publication Date: 2021-04-23
OCEAN UNIV OF CHINA
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Problems solved by technology

However, the above method filters out the drift item through filtering, which will inevitably cause the loss of information in the heave motion parameters, resulting in poor estimation accuracy

Method used

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  • Heaving acceleration-based semi-submersible type ocean platform heaving motion parameter forecasting method
  • Heaving acceleration-based semi-submersible type ocean platform heaving motion parameter forecasting method
  • Heaving acceleration-based semi-submersible type ocean platform heaving motion parameter forecasting method

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Embodiment Construction

[0061] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0062] The present invention provides a method for predicting heave motion parameters of a semi-submersible ocean platform based on heave acceleration, such as figure 1 shown, including:

[0063] (1) In the heave motion of the semi-submersible offshore platform, based on the linear potential flow theory, ignoring the coupling effect of additional mass and radiation damping, the heave acceleration of the semi-submersible offshore platform is characterized, and the theoretical value of the heave acceleration is determined. Specifically:

[0064] In the heave motion of the semi-submersible ocean platform, based on the linear potential flow theory, the coupling effect of additional mass and radiation damping is ignored, and the influence of wave force, restoring force and radiation force in the fluid is considered, and the heave motion is expressed...

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Abstract

The invention relates to a heaving acceleration-based semi-submersible ocean platform heaving motion parameter prediction method, which comprises the following steps of: in heaving motion, ignoring the coupling influence of additional mass and radiation damping based on a linear potential flow theory, and representing heaving acceleration; considering the noise influence of the actually measured marine environment, the low-frequency influence caused by slow change of the environment and the influence caused by the baseline drift error of the acceleration sensor, introducing a noise item, a low-frequency change item and a baseline drift error item, and carrying out unified Prony sequence normalization representation on the noise item, the low-frequency change item and the baseline drift error item; and performing drift term removal on the heaving acceleration after normalization representation, establishing a relational expression between the heaving acceleration and heaving motion parameters through the residual Prony sequence after drift term removal, and estimating the heaving motion parameters. Compared with a traditional method based on a filter, the method has the advantages that heaving motion parameters are estimated through the Prony sequence, and higher calculation precision is achieved.

Description

technical field [0001] The invention belongs to the technical field of heave motion of a semi-submersible platform, in particular to a method for predicting heave motion parameters of a semi-submersible ocean platform based on heave acceleration. Background technique [0002] During the operation of the semi-submersible platform, many marine technology applications are carried out based on the heave motion of the structure, so it is very important to monitor the heave motion of the semi-submersible platform. For example, the heave motion of the semi-submersible platform is one of the important external forces of the riser system, which is directly related to the overall dynamic response analysis of the riser system and seriously affects the stability of the vertical transportation system. Another application example is during the installation of offshore structures, high-precision heave motion monitoring can effectively improve the installation efficiency of offshore structu...

Claims

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Application Information

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IPC IPC(8): B63B79/00B63B79/20
CPCB63B79/30B63B1/107B63B35/4413B63B79/10B63B79/20
Inventor 刘福顺高树健纪翔田哲
Owner OCEAN UNIV OF CHINA
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