Research On Placement Optimization Of Fiber Bragg Grating Sensor For Cylindrical Shell

Due to their working characteristics,submarines are generally subjected to long-termvariable loads,and the hulls of submarines will inevitably cause structural damage,which will lead to serious accidents.Therefore,it is necessary to conduct structural health monitoring on submarines.With the development of fiber grating sensing technology,Fiber Bragg Grating Sensor(FBGS for short)has been gradually applied to the field of ship structure health monitoring with its unique advantages.The relevant technology for shipbuilding structure health monitoring based on FBGS has also been gradually developed.As an important part of structural health monitoring,the placement optimization of FBGS will directly affect the monitoring results.However,the relevant researches at the current stage mostly focus on one-dimensional or two-dimensional structures of surface ships.The related research on the three-dimensional cylindrical shell structure of submarines needs to be carried out urgently.Therefore,this paper proposes a research on the placement optimization of FBGS for cylindrical shell.In this paper,the appropriate optimal placement criteria is adopted,and the objective function and constraint conditions of the FBGS placement optimization for the three-dimensional cylindrical shell structure subject to static force are given.In addition,for the multi-constrained optimization problem,this paper has successively used the Genetic Algorithm and the Partheno Genetic Algorithm with penalty function to optimize the number and the deployment positions of FBGS.Furthermore,this paper uses MATLAB program to achieve the relevant algorithm.On the basis of implementing the algorithm program,this paper selects a three-dimensional cylindrical shell example model,and compares the optimized layout scheme obtained by using the optimization algorithm of this paper with the traditional empirical layout method,which verifies the feasibility and superiority of the optimization method in this paper.In addition,this paper uses the GUI function based on MATLAB program to develop a FBGS placement optimization software for the cylindrical shell structure,By using this GUI software,the FBGS arrangement of the St.Petersburg class submarine compartment structure has been optimized and a favorable layout effect has been obtained.