Method and system for calculating axial rigidity of marine fiber reinforced flexible pipe

Abstract

The invention relates to a marine fiber reinforced flexible pipe axial rigidity calculation method and system, and the method comprises the steps: building a first rigidity matrix and a flexibility matrix according to preset initial material parameters, and building a radius matrix and a laying angle matrix according to preset initial section geometric parameters; performing coordinate transformation on the first stiffness matrix to obtain a second stiffness matrix; and establishing an equilibrium equation based on an energy conservation principle of an energy method, calculating the axial rigidity according to the equilibrium equation, and when the axial rigidity reaches a preset value, obtaining a preliminary design scheme of the marine fiber reinforced flexible pipe according to the material parameters and the section geometric parameters corresponding to the axial rigidity. According to the method, the relation among material parameters, section geometric parameters and the axial rigidity of the marine fiber reinforced flexible pipe is established on the basis of the energy conservation principle, the calculation efficiency is improved, meanwhile, directional design of the section of the pipe can be achieved, and a preliminary design scheme meeting user requirements is obtained in a short time on the basis.

Description

technical field [0001] The invention belongs to the technical field of marine engineering, and in particular relates to a method and system for calculating the axial stiffness of a marine fiber-reinforced flexible pipe. Background technique [0002] For oil and gas production in deepwater and ultra-deepwater marine environments, the safety and reliability of risers are critical. Traditional steel pipes have poor corrosion resistance, so it is urgent to develop other pipeline transportation solutions. The marine fiber reinforced flexible pipe has good corrosion resistance and compression resistance, good thermal insulation, high stiffness-to-mass ratio, sufficient flexibility, good fatigue resistance, etc., so it is widely regarded as a traditional steel pipe. replacement of. At present, such pipelines have been used as water injection pipelines and oil collection pipelines in some shallow waters in the Middle East and Southeast Asia. The marine fiber-reinforced flexible p...

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Problems solved by technology

Among them, the experiment needs to be individually designed and modified according to the size of the pipeline. This type of experimental equipment is usually complex in form, large in shape, and high in cost. The experimental process is greatly affected by equipment modification, test piece processing quality, test piece tooling, etc.

However, numerical simulation requires separate modeling of each model, which is time-consuming and consumes a large amount of computing resources. At the same time, it is difficult to intuitively obtain the internal relationship between material parameters, section parameters and pipeline axial stiffness, and it is difficult to directly guide the directional design of pipelines. It is difficult to obtain a cross-sectional design that meets the requirements in a short time

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