船舶のヘルスモニタリング・システムに関する研究

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Recently, there has been a growing interest in the so-called intelligent or smart structures, among which is the idea of Health Monitoring. The health monitoring is to emulate the nerve system of human body. The aim of health monitoring is to provide real time and continuous health assessments by setting up innovative sensors and signal transmission network in the structure Timely detection of structural damages such as fatigue crack, buckling or excessive deformation is the main purpose of the monitoring. In this study, feasibility of health monitoring system is discussed for the crack form damages of metal ship structures. In order to carry out wide range monitoring, three types of line sensors, i. e. the electro-conductive film sensor, the electro-conductive paint sensor and the plastic optical fiber sensor, are made on an experimental basis. The sensors are bonded on the surfaces of a welded joint model and a notched plate specimen by adhesives or painting, and fatigue tests are carried out. The performance of crack detection of each sensor, the time and the expense required for the installation of the sensors, the possibility of false indication of each sensor, the influence of corrosion environment on the sensor systems and etc. are investigated based on the result of experiments. Further, the significance of health monitoring on structural safety and the condition that the health monitoring becomes profitable compared with in-service inspections are made clear based on the reliability analysis taking the lifetime operating cost into account.
社団法人日本船舶海洋工学会の論文

船舶のヘルスモニタリング・システムに関する研究

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