The Dynamics of Geometrically Compliant Mooring Systems
Abstract
Geometrically compliant mooring systems that change their shape to accommodate deformations are common in oceanographic and offshore energy applications. This thesis describes a numerical program and experimental results which are used to develop an understanding of the dynamic response of these systems. A numerical program is described which uses the generalized-a method for temporal integration. Compared to other schemes, the generalized-a algorithm has the advantages of second-order accuracy, controllable numerical dissipation, and improved stability for the nonlinear problem. The numerical program is validated using results from laboratory and field experiments. Field experiment and numerical results are used to develop a simple model for dynamic tension response in geometrically compliant moorings. For most moorings, the response is dominated by inertial and drag effects. The simple model uses just two terms to accurately capture these effects. The interaction of the mooring line with the sea floor is considered. Using video and tension data from laboratory experiments, the tension shock condition at the touchdown point and its implications are observed for the first time. Results from the laboratory experiments are also used to demonstrate the suitability of the elastic foundation approach to modeling sea floor interaction in numerical programs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2000
- Accession Number
- ADA384976
Entities
People
- Jason I. Gobat
Organizations
- Massachusetts Institute of Technology