Modeling calculation and analysis method of stress field of composite submerged cable

Abstract

The invention relates to a modeling calculation and analysis method of a stress field of a composite submerged cable. The method comprises the steps of: based on a finite element method, building a stress field model of the composite submerged cable under the action of external force; and obtaining corresponding relation data of stress and strain of an optical fiber in the submerged cable and the actual distance of the submerged cable in the model under different loads and boundary conditions to obtain the frequency shift rule of the optical fiber under the action of the external force, thereby distinguishing the frequency shift of the submerged cable caused by the action of the external force and local heating, so as to achieve early detection alarming of a fault of the submerged cable and immediately prevent the fault from deteriorating. Compared with the strain data obtained by an experiment method, a lot of financial resources and material resources can be saved.

Description

technical field [0001] The invention relates to a distributed real-time monitoring and measurement technology for an optoelectronic composite submarine cable, in particular to a modeling calculation and analysis method for a composite submarine cable stress field. Background technique [0002] The photoelectric composite submarine cable is buried on the seabed during operation, and external forces such as anchors and fishing gear trawls may cause damage to the submarine cable. Therefore, it is necessary to monitor the optical fiber strain of the photoelectric composite submarine cable, so as to realize the submarine cable strain caused by external force. Initial monitoring and alerting. At present, we generally use the Brillouin optical time domain analyzer (BOTDA analyzer for short) to obtain the optical fiber spectrum shift of the optoelectronic composite submarine cable, but we do not know whether the external cause of the spectrum shift is the local heating of the submar...

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Problems solved by technology

Moreover, the actual conditions do not allow us to obtain the strain data of the optical fiber inside the submarine cable through experiments, and there is no method to distinguish the spectrum shift caused by the local heating of the submarine cable and the external force. Therefore, it is often difficult to find out the cause of the fault.

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