Dynamic response solving method suitable for ocean floating structure

Abstract

The invention belongs to the technical field of ocean engineering dynamic calculation, and provides a dynamic response solving method suitable for an ocean floating structure. The method comprises the following steps: S10, establishing a state space model corresponding to a floating structure motion equation, and constructing state space model parameters; S20, based on the floating structure motion equation, constructing a transfer function and a rational score form thereof, and establishing a relationship between the state space model parameters and transfer function coefficients; S30, linearly solving transfer function coefficients in a rational fraction form; S40, according to the solved transfer function coefficients, solving the state space model parameters in a time domain; S50, based on the state space model, substituting the solved state space model parameters, and calculating and forecasting a dynamic response of each freedom degree of of the floating structure. According to the method, high-efficiency calculation and forecasting can be realized, and the forecasting accuracy can be ensured.

Description

technical field [0001] The invention belongs to the technical field of marine engineering dynamic calculation, and in particular relates to a dynamic response solution method applicable to marine floating structures. Background technique [0002] In recent years, with the development of offshore wind power, offshore oil platforms and other offshore projects into deep and open seas, new demands have been put forward for marine floating structures at different levels. However, whether it is a floating offshore wind turbine or a floating offshore platform, considering structural safety and equipment durability, the dynamic response of the floating structure under the action of complex random waves cannot be ignored. This requires that both the floating wind turbine and the floating offshore platform need to evaluate and predict the dynamic response during the design stage or the operation stage, so as to ensure the reliable operation of the floating structure. [0003] Typical...

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Problems solved by technology

But generally speaking, the existing time-domain method still needs to solve the convolution term in the Cummins equation, the solution efficiency is low and the error accumulation is serious, and it cannot meet the needs of short design cycle or fast and accurate prediction of dynamic response during operation and maintenance; the existing frequency-domain method It is difficult to calculate the transient response by the method, and the prediction accuracy depends on the selection of the frequency coefficient, which is not conducive to structural design and actual engineering safety warning

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