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本文对某自升式海上石油钻井平台的振动模态进行了计算和分析。平台长57.6米、宽34米,采用4根直径为3米的管形桩腿,腿高78米,工作水深40米,桩腿插入泥面以下约3米。本文提出了计算该平台振动模态的两种模型:空间薄壁结构模型和空间框架模型,用 SAP5结构分析程序进行了计算,获得了该平台的第一至第廿谐调的振动频率和模态,为我国自升式钻井平台动态特性的设计、分析和使用提供了有用的数据和可行的方法。文中对上述两种计算模型作了分析和比较,指出本文提出的空间薄壁结构模型是计算这类平台整体振动模态的一种简单易行而又经济的合理模型。此外,本文还指出了这类平台振动周期的跳跃现象,讨论了桩腿的支承条件对平台振动周期的影响以及平台结构的质量和附连水质量的处理等问题。
In this paper, the vibration mode of a jack-up offshore oil rig is calculated and analyzed. The platform is 57.6 meters long and 34 meters wide. It adopts four tubular legs with a diameter of 3 meters. The legs are 78 meters high and the working depth is 40 meters. The legs are inserted into the mud surface for about 3 meters. In this paper, two models for calculating the vibration mode of the platform are proposed: space thin-walled structure model and space frame model, calculated by SAP5 structural analysis program, and obtained the vibration frequencies and modes of the first to the twenty-second harmonics of the platform , Provided useful data and feasible methods for the design, analysis and use of the dynamic characteristics of self-elevating drilling platform in our country. The paper analyzes and compares the above two calculation models, and points out that the space-thin-walled structure model proposed in this paper is a simple and feasible and economical reasonable model for calculating the overall vibration modes of such platforms. In addition, this paper also pointed out the jumping phenomenon of the vibration cycle of this kind of platform, discussed the influence of the supporting conditions of the legs on the vibration period of the platform, the quality of the platform structure and the handling of attached water quality.