title: Development and Sensing Properties Study of Underwater Assembled Water Depth-Inclination Sensors for a Multi-Component Mooring System, Using a Self-Contained Technique.
abstract: Prototype monitoring techniques play an important role in the safety guarantee of mooring systems in marine engineering. In general, the complexities of harsh ocean environmental conditions bring difficulties to the traditional monitoring methods of application, implementation and maintenance. Large amounts of existing mooring systems still lack valid monitoring strategies. In this paper, an underwater monitoring method which may be used to achieve the mechanical responses of a multi-point catenary mooring system, is present. A novel self-contained assembled water depth-inclination (D-I) sensor is designed and manufactured. Several advanced technologies, such as standalone, low power consumption and synchronism, are considered to satisfy the long-term implementation requirements with low cost during the design process. The design scheme of the water resistance barrel and installation clamp, which satisfies the diver installation, are also provided in the paper. An on-site test has previously been carried out on a production semisubmersible platform in the South China Sea. The prototype data analyses, including the D-I value in the time domain (including the data recorded during the mooring retraction and release process) and spectral characteristics, are presented to reveal the accuracy, feasibility and stability of the sensor in terms of fitting for the prototype monitoring of catenary mooring systems, especially for in-service aging platforms.
authors.affiliation: State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China. lxyuhua@dlut.edu.cn.
authors.forename: Wenhua
authors.initials: W
authors.lastname: Wu
authors.affiliation: China National Offshore Oil Corporation, Research Institute, Beijing 100028, China. fengjg@cnooc.com.cn.
authors.forename: Jiaguo
authors.initials: J
authors.lastname: Feng
authors.affiliation: China National Offshore Oil Corporation, Research Institute, Beijing 100028, China. xiebin@cnooc.com.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Xie
authors.affiliation: Department of Computer Science and Technology, Dalian University of Technology, Dalian 116024, China. tangda@dlut.edu.cn.
authors.forename: Da
authors.initials: D
authors.lastname: Tang
authors.affiliation: State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China. yueqj@dlut.edu.cn.
authors.forename: Qianjin
authors.initials: Q
authors.lastname: Yue
authors.affiliation: China National Offshore Oil Corporation, Shenzhen Branch, Shenzhen 518000, China. ribin_xie@cnooc.com.cn.
authors.forename: Ribin
authors.initials: R
authors.lastname: Xie
keywords: multi-component mooring system; offshore platform; self-contained technique; standalone; water depth-inclination sensor