Rolling Characteristics of Self-Elevating Platform and a Study on its Anti-Rolling Device (Report 1)

Abstract

Various kinds of work done at sea are often characterized by far lower efficiency than in work performed on land. This is true of the self elevating platform (S.E.P.), the subject of this paper. Although the S.E.P. is designed to be able to resist winds below 60 meters per second and waves below 10 meters high, the regulations forbid installing it on the sea bottom or its removal from there under conditions involving winds of more than 10 meters per second or waves of more than 1.5 meters high, for the purpose of protecting its lengthy legs. But the necessity of standby time to wait for the recovery of good weather means poor efficiency. This paper mathematically proves, through a study of the rolling characteristics of the S.E.P., the effectiveness of an automatically controlled anti-rolling device in decreasing its rolling by means of compressed air.