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Mooring system diagnosis and structural reliability control for position moored vessels |
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| Affiliation: | 1. Subsea Installations, Technip Norge A/S, NO 1303 Sandvika, Norway;2. Department of Electrical Engineering, Technical University of Denmark, DK 2800 Kgs. Lyngby, Denmark;3. Department of Marine Technology, Norwegian University of Science and Technology, NO 7491, Norway;4. AMOS CoE, Institute for Technical Cybernetics, Norwegian University of Science and Technology, NO 7491, Norway;1. University of Bayreuth, Mathematical Institute, Germany;2. Ruhr-University Bochum, Institute of Automation and Computer Control, Germany;1. Federal Technological University of Paraná, Av. Alberto Carazai, 86300-000 Cornélio Procópio, PR, Brazil;2. Department of Automation and Systems - Federal University of Santa Catarina, 88040-900 Florianópolis, SC, Brazil;1. School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, China;2. University of Toronto Institute for Aerospace Studies (UTIAS), Toronto, Canada;3. School of Astronautics, Harbin Institute of Technology, Harbin, China |
| Abstract: | Early diagnosis and fault-tolerant control are essential for safe operation of floating platforms where mooring systems maintain vessel position and must withstand environmental loads. This paper considers two critical faults, line breakage and loss of a buoyancy element and employs vector statistical change detection for timely diagnosis of faults. Diagnosis design is scrutinised and a procedure is proposed based on specified false alarm probability and estimation of the distribution of the test statistics on which change detection is based. A structural reliability index is applied for monitoring the safety level of each mooring line and a set-point chasing algorithm accommodates the effects of line failure, as an integral part of the reliability-based set-point chasing control algorithm. The feasibility of the diagnosis and of the fault-tolerant control strategy is verified in model basin tests. |
| Keywords: | Fault diagnosis Fault-tolerant control Position mooring Structural reliability Change detection Optimal set-point chasing |
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