초록 ▼

For continuous monitoring of dynamic loads, including stresses and strains in large hull structures for vessels (5), a strain measurement system (2) is employed with fiber optic cables which connect optical strain sensors (7; 16) at different points in the hull structure. Optical signals for detecti

For continuous monitoring of dynamic loads, including stresses and strains in large hull structures for vessels (5), a strain measurement system (2) is employed with fiber optic cables which connect optical strain sensors (7; 16) at different points in the hull structure. Optical signals for detection of stresses and strains are distributed to the strain sensors (7; 16) from an optical transmitter (11). The strain measurement system (2) is connected via a central monitoring unit (10) to a computer-implemented control system (1) which in turn is connected to a display and data presentation unit (4) and possibly other measurement systems (3). In a first operating mode, strain values during loading and unloading of the vessel (5) are detected by the strain sensors (7; 16). The control system (1) generates a curve which shows an average strain, and an alarm signal if the average strain exceeds a predetermined threshold which indicates an unacceptable level of strain. In a second operating mode, when the vessel (5) is underway, strains are continuously detected by the strain sensors (7; 16). An alarm signal is generated if the average strain exceeds a predetermined threshold which indicates an unacceptable level of strain. A strain measurement system and a fiber optic strain sensor (16) are also used with this method.

대표청구항 ▼

[ We claim:] [1.] A method for continuous monitoring of dynamic loads, including stresses and strains in large hull structures for vessels, especially in steel hulls of bulk carriers and tankers, wherein there is employed a strain measurement system with fiber optic cables which connect optical stra

[ We claim:] [1.] A method for continuous monitoring of dynamic loads, including stresses and strains in large hull structures for vessels, especially in steel hulls of bulk carriers and tankers, wherein there is employed a strain measurement system with fiber optic cables which connect optical strain sensors on various points in the hull structures, wherein optical signals for detection of stresses and strains are distributed to the strain sensors from an optical transmitter and after passing through the strain sensors are detected by one or more optical detectors, wherein the optical transmitter and the optical detectors are provided in a central monitoring unit, and wherein the strain measurement system is connected via the central monitoring unit to a computer-implemented control system which in turn is connected to a display and data presentation unit and further possible measurement systems, characterized in that a first operating mode, during loading and unloading of the vessel, the method comprises the steps of continuously detecting strain values by means of the strain sensors, generating by means of the control system a curve which shows an average strain, updating the curve at a predetermined time interval, displaying the generated curve on the display unit, and generating an alarm signal if the average strain exceeds a predetermined threshold which indicates an unacceptable level of strain, and that in a second operating mode when the vessel is underway, the method comprises the steps of detecting strains continuously by means of the strain sensors, generating by means of the control system a curve which shows average strain and a curve which shows the strain's standard deviation respectively, updating the said curves at a predetermined time interval, displaying the generated curves on the display unit and generating an alarm signal if the average strain exceeds a predetermined threshold which indicates an unacceptable level of strain.