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Portable Free Drifting Wavebuoy
KTH, Superseded Departments, Aeronautical and Vehicle Engineering. (Marina system)
2003 (English)Student thesis
Abstract [en]

This survey is about how to measure the sea state. A view of the existing tecniques on the market and, when possible, the prices of now existing products is presented. The main purpose is to investigate the possibility to measure waves with an inexpensive freedrifting wavebuoy. The maximum material cost has been set to around 3000 kr, which severely limits the possibilitis. Ideas of how to analyse data from such a buoy and analysehow reliable this data can possibly become, is presented. A prototype of a wavebuoy is described and also the test results of the buoy, together whith descriptions of how the tests have been conducted. Effort has been made to put light on the kind of problems and errors that may occure when using these methods. The tests have shown that it is possibleto measure waves with a free floating wavebuoy with only one accelerometer as active sensor. The design of the buoy is important to minimize the movements of the buoy,since when tilted the buoy does not give accurate data. The incoming data must be filtered and when that is done the band whith of the buoy decreases. In this case the buoycan measure waves with frequencies over 0.14 Hz, which in deep water means waves with wavelength less than 80 m. It is important to know that far too few tests in different wavespectras have been conducted to be sure of the achieved results. Further tests and investigations should be made and this survey is to be seen as a first step.

Place, publisher, year, edition, pages
2003. , 37 p.
URN: urn:nbn:se:kth:diva-11103OAI: diva2:235800

NR 20140804Available from: 2009-09-18 Created: 2009-09-18 Last updated: 2010-04-28Bibliographically approved

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