Abstract This article investigates two effects of seal friction of hydropneumatic Passive Heave Compensator (PHC) during offshore drilling for contact and non-contact operations. The first is the attenuation rate variation of the transmitted heave movement in function of the amplitude of the platform motion. The second is the Compensator-Induced Vibration (CIV), which induces longitudinal oscillations of frequencies higher than the heave motion. These phenomena are explained by an analysis of PHC forces (linearization and frequency spectra) and a modal analysis of the drill string dynamic with PHC (mode shapes and boundary conditions). An active controller is proposed to mitigate the seal friction of PHC in part II of this two part paper series.

中文翻译：

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被动升沉补偿器非线性摩擦对钻井作业的影响——第一部分：建模与分析

摘要 本文研究了海上钻井接触式和非接触式作业中液压气动被动升沉补偿器 (PHC) 密封摩擦的两种影响。第一个是传递的升沉运动随平台运动幅度变化的衰减率变化。第二种是补偿器引起的振动 (CIV)，它会引起频率高于升沉运动的纵向振动。这些现象可以通过 PHC 力的分析（线性化和频谱）和使用 PHC（模态形状和边界条件）的钻柱动态模态分析来解释。在这两部分论文系列的第二部分中，提出了一种主动控制器来减轻 PHC 的密封摩擦。