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Semi-active optimal vibration control method of jacket ocean platform nonlinear system

A technology of nonlinear systems and offshore platforms, applied in the field of semi-active optimal vibration control of nonlinear systems of jacket offshore platforms

Inactive Publication Date: 2012-11-28
梁燕军 +2
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the research on semi-active control technology and active control technology is still a frontier research direction and is still in the stage of theoretical exploration and experimentation.

Method used

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  • Semi-active optimal vibration control method of jacket ocean platform nonlinear system
  • Semi-active optimal vibration control method of jacket ocean platform nonlinear system
  • Semi-active optimal vibration control method of jacket ocean platform nonlinear system

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, the present invention will be further described:

[0047] The semi-active vibration control method for the nonlinear system of the jacket offshore platform in this embodiment includes the following steps:

[0048] (1) Establishing an irregular wave load model: the total wave force acting on the jacket offshore platform can be synthesized by the forces of each component wave to obtain the total wave force acting on the jacket offshore platform, which will eventually act on the jacket The total wave force on the offshore platform is generated by an independent external system; as figure 1 As shown, firstly, the horizontal wave force at a certain moment on the unit circle section is obtained as:

[0049] p u = ρ C D D | v | v ...

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Abstract

The invention provides a semi-active optimal vibration control method of a jacket ocean platform nonlinear system. The method comprises the steps of aiming to irregular wave loads, considering about nonlinear dynamic characteristics of interaction between fluid and structure, building a jacket ocean platform nonlinear system model according to Newton's laws of motion, selecting performance indexes, implementing principle of the maximum, and converting the non-linear optimal control problem to be a nonlinear nonhomogeneous two-point boundary problem, using a successive approximation method to solve approximate solution of the nonlinear nonhomogeneous two-point boundary problem, and obtaining the optimal vibration control law. The optimal vibration control law comprises an accurate linear feedback part and a nonlinear compensating part, wherein the nonlinear compensating part is the limit of a costate vector equation sequence.

Description

technical field [0001] The invention relates to a vibration control technology, in particular to a semi-active optimal vibration control method for a nonlinear system of a jacket ocean platform. Background technique [0002] With the depletion of land resources, the development and utilization of marine resources has become increasingly important. my country has a vast sea area and rich oil and gas resources. There are offshore oil and gas exploration platforms in the South China Sea, East China Sea and Bohai Sea. Offshore structures such as offshore platforms are the basic facilities for the development of offshore oil and gas resources and the bases for offshore production, operation and living. It has been in the harsh marine environment for a long time, and is subjected to continuous and long-term effects of natural environmental loads such as wind, waves, sea ice, currents, earthquakes and tides, which will inevitably cause continuous vibration of the offshore platform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 梁燕军王爱民孙华郭磊熊晶
Owner 梁燕军
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