Abstract
Semisubmersibles are the most widely used offshore mobile units for deepwater drilling. Because of their improved motion characteristics they provide a more stable drilling platform. This feature of improved motion characteristics has become an important cost-effective design consideration as larger and more expensive drilling units are needed for deeper water and harsher environments. This paper presents a simple analytical method to compute semisubmersible motion characteristics. Programmed in a microcomputer, this becomes an important tool for designers to identify the important parameters affecting the platform motions, to study their effects, and then to choose desirable values of these parameters for improved design. The program is verified with experimental data, and example applications are given.
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