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• W2078596143 abstract "Abstract A transducer has been designed to measure the forces, primarily due to waves, experienced by structure!;&gt; at sea. It is designed to be fitted to structures already at sea and does not require mechanical modifications to the structures. This paper briefly describes the development work leading to the trials at sea of a small scale prototype then discusses the problems that are anticipated for the use of this transducer on larger, full-scale, structures and indicates possible solutions to these problems. 1.Introduction The National Maritime Institute (NMI), a united Kingdom Government (UKG) research establishment of the Department of Industry, provides a service of measurements at sea. In 1975 a range of research programmes were sponsored by the Ship and Marine Technology Requirements Board (SMTRB) of the UKG to investigate and prOVide basic data about forces exPerienced bytypical structures at sea such as oil rigs due to their inter-reaction with the'natural environment. As part of this research NMI were given charge of the section involving the measurement of forces and environmental conditions experienced by a specially constructed research structure,. intermediate in size between laboratory scale models and full size. This structure located just off the south coast of the UK is referred to as the christchurch Bay Tower (CBT),(Fig. 1). It is 27.8 metres tall and stands in 8.4 metres of water. 128 channels of measurement and environmental data are monitored on a regular basis. [1]. During the initial investigative work for this structure it became readily apparent that forcemeasurement on structures at sea commonly relies on the use of strain gauge devices, normally installed during structure manufacture. Although not proposed for use on the CBT, a requirement was seen for a simpler system of wave force measurement that could be easily attached to existing structures already at sea. As a result of this a technique was proposed whereby pressure changes caused by wave forces rather than by sea surface elevation changes, could be measured. The system that was proposed, shown schematically in Fig. 2, is that a number of flexible, fluid-filled cells, enclosed in a rigid outer casing, are equi-spaced around the structural member of interest. Forces applied to the load ring of this casing are transmitted through to the flexible cells causing changes in their internal pressures. These changes in internal pressures then being measured. The pressure exerted on the immersed casing is dependant upon:atmospheric pressuredepth of immersion below lowest tide leveltide height at any given timedensity of sea waterforce due to tidal velocitywave heightforces due to waves, e.g. drag, inertia and slam" @default.
• W2078596143 created "2016-06-24" @default.
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• W2078596143 date "1981-05-04" @default.
• W2078596143 modified "2023-09-23" @default.
• W2078596143 title "The Development And Proposed Use Of A Wave Force Measurement System" @default.
• W2078596143 doi "https://doi.org/10.4043/4126-ms" @default.
• W2078596143 hasPublicationYear "1981" @default.
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