Analytic calculation method for random dynamic response of floating ocean structure

Abstract

The invention provides a floating ocean structure random dynamic response analytical calculation method. The method comprises the following steps: S1, determining a response function of the causal wave-floating structure hydrodynamic system; s2, based on the causal wave-floating structure hydrodynamic system response function, constructing a pole-residue representation model of the causal floating structure; s3, carrying out pole-residue operation on the pole-residue representation model, and solving causal floating structure non-stationary random dynamic response statistics; and S4, carrying out reverse time shifting on the causal floating structure non-stationary random dynamic response statistics to obtain an actual non-causal floating structure time-frequency evolution response spectrum and time-varying mean square response statistics. According to the method, the defect that a traditional spectrum analysis method can only solve stable response is overcome, the problems that a Monte Carlo simulation method is sensitive to sampling intervals and low in calculation efficiency are solved, and a brand-new calculation method with high precision and high efficiency is provided for actual engineering analysis.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to an analytical calculation method for the random dynamic response of a floating marine structure. Background technique [0002] Floating marine engineering structures, such as various types of ships, marine platforms and marine energy power generation devices, are key basic equipment for developing marine resources, maintaining marine rights and interests and developing marine economy. The marine environment is harsh, complex and changeable. Under the action of environmental loads such as large waves, strong winds and strong ocean currents, the floating structure will have a significant dynamic response, which will easily lead to instability and overturning of the floating body, extreme strength failure and long-term cumulative fatigue damage. Affect the safety and reliability of the structure. Therefore, the dynamic response analysis of marine floating structures is v...

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Problems solved by technology

The Monte Carlo simulation method can obtain structural responses with high precision, but it is still a deterministic dynamic analysis method in essence, which can only obtain discrete numerical solutions, and the calculation results are obviously affected by the selection of time intervals; in addition, its high precision depends on Due to a large number of samples, the calculation time and economic cost are expensive, and the calculation efficiency is low. Especially in the initial design stage of the floating structure, it is often necessary to repeatedly modify and recalculate the design scheme, which seriously restricts the engineering practicality of the Monte Carlo method. sex

[0006] Therefore, the existing frequency domain and time domain methods cannot balance calculation accuracy and calculation efficiency, and it is urgent to develop an accurate and efficient non-stationary stochastic dynamic response analysis method for floating structures to serve the actual engineering design and development of floating structures

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