Memorial University DAI: Methods for removing inertial force from measured wave impact force signals

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Document Description

Title	Methods for removing inertial force from measured wave impact force signals
Author	Winsor, Fraser N., 1961-
Description	Thesis (M.Eng.)--Memorial University of Newfoundland, 2000. Engineering and Applied Science
Date	2000
Pagination	xxviii, 414 leaves : col. ill.
Subject	Wave resistance (Hydrodynamics); Offshore structures--Hydrodynamics
Degree	M.Eng.
Degree Grantor	Memorial University of Newfoundland. Faculty of Engineering and Applied Science
Discipline	Engineering and Applied Science
Language	Eng
Notes	Bibliography: leaves [194-197]
Abstract	This report discusses the implementation of three methods for removing or mitigating the so-called inertial force from measured signals resulting from wave impact on components of offshore structure models. The wave impact causes vibration or acceleration in the modeted component. The acceleration is perceived as a force by the measurement transducers. This inertial force component is not scaleable, and must be removed in order to obtain the actual applied force. -- A mitigation method based on the solution of the system equation of motion using normalized coordinates, known as the normal mode method, is investigated. A technique based on the division of the fast Fourier transform of the measured force by the system frequency response, known as the inverse Fourier transform method, is implemented. Finally, the use of digital low pass and band reject filters is examined. -- These techniques are applied to wave impact and decay test measurements from experiments conducted on jacket type fixed offshore structure models. -- The results prove to be less than ideal. The reasons for this are discussed, and recommendations are made for future investigations.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a1493272
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(38.54 MB) -- http://collections.mun.ca/PDFs/theses/Winsor_FraserN.pdf
CONTENTdm file name	125026.cpd