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前言近年来自升式钻井平台发展很快,我国已设计制造了四十米水深的自升式钻井平台,还引进了几条九十米水深的自升式钻井平台。这些平台在使用过程中曾发生某些振动问题,如我国引进的九十米水深自升式钻井平台“渤海四号”在二十五米水深钻井时曾屡次发生桩腿悬臂部分的风激振动,这时风流引起的涡旋频率与桩腿的扭转频率相接近,因而
Preface In recent years, self-elevating drilling platforms have developed rapidly. Our country has designed and manufactured self-elevating drilling platforms with a depth of 40 meters and introduced several self-elevating drilling platforms with a depth of 90 meters. Some vibration problems have occurred during the use of these platforms. For example, Bohai No.4, a 90-meter deep water jack-up drilling platform introduced by China, has repeatedly suffered wind-induced vibration of the cantilever portion of the leg during drilling at a water depth of 25 meters , When the whirlwind frequency caused by the wind is close to the torsional frequency of the leg, therefore