Random wave generation and analysis procedures

Sharp, Malcolm C. R. (1983) Random wave generation and analysis procedures. MSc(R) thesis, University of Glasgow.

Abstract

The thesis describes the development of the capabilities for random seaway generation and spectral analysis of signals within the Hydrodynamics Laboratory at the University of Glasgow. In the course of developing the computer software to provide random analogue time series signals of known spectral form and subroutines to perform the analysis of the response time series signals from the test in progress, work in the following areas was done. (a) Representation of wave spectral formulations in a rational system of units, and coding of the resulting formulas as computer subroutines (b) Computer data-acquisition and storage programs (c) Computer coding of random data analysis routines including spectral windowing, Fast Fourier Transforms, computation of auto and cross spectra, frequency response function and coherence. (d) Development of a specialised spectral window formula for use in the accurate determination of the amplitude of components in harmonic signal analysis via the Fast Fourier Transform The thesis covers a method of 'iterative refinement' of the correction to the wave drive signal to account for the non-linear transfer function characteristic of the servo-hydraulic wavemaker system used. Results of 3 series of tests are presented. The first test defines the transfer function characteristic of the servo-hydraulic wavemaker and its operating enevelope. The second test generated the required drive time series signals for a 1/l00th scale Pierson-Moskowitz wave spectrum of significant wave heights 5, 10 and 15 metres. The third test series uses the drive test signals generated in the second test, in an experiment to determine the motion characteristics of a model tethered oil storage buoy. Graphs of the wave spectra and motion responses obtained are presented. The concluding chapter covers the limitations of the system as described in the thesis and suggests improvements that might be made.

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
• Colleges/Schools: College of Science and Engineering > School of Engineering > Naval Architecture and Marine Engineering
• Supervisor's Name: Supervisor, not known
• Date of Award: 1983
• Depositing User: Enlighten Team
• Unique ID: glathesis:1983-83213
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 19 Oct 2022 08:05
• Last Modified: 19 Oct 2022 08:06
• Thesis DOI: 10.5525/gla.thesis.83213
• URI: https://theses.gla.ac.uk/id/eprint/83213