Hotspot stress monitoring method based on measurement point pressure of optical fiber sensor

Abstract

A hotspot stress monitoring method based on a measurement point pressure of an optical fiber sensor belongs to the field of local strength monitoring and ship stress monitoring of a designed ship. Themethod comprises the steps of mounting the optical fiber sensor according to the need of an actual ship height stress region, wherein the sensor is placed in a nominal stress region; conducting a finite element model simulation experiment, reading similar loading and capacity conditions in a finite element simulation process in combination with a sea condition and wave parameter information, determining an actual ship stress, and determining a measurement point position and finding out a relation coefficient k of the measurement point and the hotspot stress; and directly reading the hotspot stress according to a formula delta2=k*delta1 and the relation coefficient in combination with the measurement point stress. According to the hotspot stress monitoring method, a finite element model and an actual ship can be better connected in series, the actual ship can directly obtain the hotspot stress according to the measurement point pressure of the optical fiber sensor in the normal sailingprocess, the condition that information such as a mounting position must be considered for accurate measurement of the hotspot stress in the optical fiber sensor mounting process can be avoided, andthe real-time monitoring of ship stress and strain can be rapidly and efficiently performed.

Description

technical field [0001] The invention belongs to the fields of local strength monitoring of designed ships and whole ship stress monitoring, and in particular relates to a hot spot stress monitoring method based on optical fiber sensor measuring point pressure. Background technique [0002] The safety of the structure during the navigation of the ship is the basis for ensuring normal navigation. In the design of the ship, the designer should determine various design loads according to the relevant specifications and guidelines provided by the classification society to evaluate the strength of the components. However, due to the complex sea conditions and the randomness of the force during the actual voyage, it is very easy to cause damage to the hull structure, so real-time monitoring of stress is required, especially the hot spot stress in high stress areas. The monitoring system has developed from the initial resistance strain gauge to today's fiber optic sensor technology,...

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