Cook Michael F.

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Cook
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Michael F.
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  • Technical Report
    Hydrodynamics of CTD instrument packages
    (Woods Hole Oceanographic Institution, 1981-09) Cook, Michael F.
    This report is part of a research project conducted at the Woods Hole Oceanographic Institution to improve the flight characteristics of CTD instrument packages. Improvement of these cable lowered instrument packages could allow their use in more severe weather conditions. It could improve the quality of the measurements. This·report presents the development of a simplified mathematical model of the CTD package flight characteristics. This computer model was exercised to perform a sensitivity analysis of different versions of CTD packages. Part of the research project includes scale model testing. The second part of the report discusses pertinent flow similarity criteria and proposes a scheme for building a CTD half scale model. Finally, recommendations to improve the hydrodynamic behaviour of the present CTD configuration are summarized at the end of the report.
  • Thesis
    Damping estimation, response prediction and fatigue calculation of an operational single pile platform
    (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1982-01) Cook, Michael F.
    A comparison between predicted and measured damping controlled dynamic response of an operational single pile platform (AMOCO's South Marsh Island Block 33B platform) is presented. In the predictive analysis, a finite element model of the structure and a theoretical assessment of damping phenomena are combined with a response prediction method which utilizes the principle of reciprocity of ocean waves. The result is a versatile expression for the estimation of the dynamic response fatigue life of a platform in a directionally spread sea. In addition, the data analysis performed on wind, wave and response time histories, recorded in March, 1980, is carefully described. A method is presented which uses biaxial accelerometer data to infer platform modal orientations and to estimate wave spreading. Finally, modal natural frequencies and damping ratios are estimated using the Maximum Entropy Method (MEM) of spectral analysis. Good agreement between predicted and estimated response characteristics is attained.