研究目的
To study a new compensation method for hull monitoring FBG sensors that includes both FBG temperature self-correction and steel thermal expansion effects correction, aiming to reduce the relative error under drastic strain and temperature changes.
研究成果
The coupled compensation method, which includes both FBG temperature self-correction and steel thermal expansion effects correction, provides more accurate results than traditional methods under drastic strain and temperature changes. This method is suitable for hull monitoring applications where precise strain measurements are critical.
研究不足
The study focuses on a specific type of steel (DH36) and may not account for all variations in material properties or environmental conditions. The finite element analysis neglects the temperature field, which could affect the accuracy of stress distribution.
1：Experimental Design and Method Selection:
The study involves theoretical derivation of a coupled compensation method for FBG sensors and experimental validation.
2：Sample Selection and Data Sources:
A standard specimen made of DH36 steel is used, with FBG strain and temperature sensors attached.
3：List of Experimental Equipment and Materials:
Includes FBG sensors, resistance strain gauge, low temperature box, and standard specimen.
4：Experimental Procedures and Operational Workflow:
Temperature is varied from 0 to -50 °C, and tensile force is applied to the specimen to measure wavelength shifts and stress.
5：Data Analysis Methods:
The thermal expansion coefficient of steel and the sensitivity coefficient of the FBG sensor are calculated, and the coupled compensation method results are compared with traditional methods.
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