A negative-stiffness damper (NSD) that incorporates eccentric columns and high-stiffness springs is proposed for vibration mitigation from drilling equipment to a semi-submersible platform. Eccentric columns are considered as negative-stiffness elements, which can provide high static stiffness and achieve negative stiffness with hysteresis energy dissipation caused by buckling mode transition under dynamic conditions. With the assistance of high-stiffness springs, the damper possesses a hysteresis loop that can dissipate vibration energy and mitigate responses. Firstly, the hysteresis characteristics and negative stiffness of eccentric columns are analyzed. Then, the design principle of the NSD is derived, and several characteristics required for applications are investigated. In addition, an NSD system is designed for a target drilling mud pump based on measured data, and the mitigation performance is analyzed by comparing the vibration responses between cases of the proposed NSD system and the steel pedestal. The results demonstrate that the proposed system can effectively reduce the width of affected coverage and the magnitudes of vibration responses. The investigations performed in this paper not only provide the design principle of the new damper, but also prove the great potential of the proposed damper in vibration mitigation from drilling equipment to the hull of the platform.

中文翻译：

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负刚度阻尼器从钻探设备到半潜式平台的减振设计与仿真

提出了一种结合了偏心柱和高刚度弹簧的负刚度阻尼器（NSD），用于减轻从钻井设备到半潜式平台的振动。偏心柱被认为是负刚度单元，可以提供较高的静态刚度，并在动态条件下具有屈曲模式过渡导致的滞后能量耗散的情况下实现负刚度。在高刚度弹簧的帮助下，阻尼器具有一个磁滞回线，可以消散振动能量并减轻响应。首先，分析了偏心柱的滞后特性和负刚度。然后，推导了NSD的设计原理，并研究了应用所需的几个特性。此外，根据测量数据为目标钻探泥浆泵设计了一个NSD系统，并通过比较拟议的NSD系统和钢制基座之间的振动响应来分析其缓解性能。结果表明，所提出的系统可以有效地减小覆盖范围的宽度和振动响应的幅度。本文进行的研究不仅提供了新型减震器的设计原理，而且证明了所提出的减震器在减轻钻井设备到平台船体的振动方面的巨大潜力。结果表明，所提出的系统可以有效地减小受影响覆盖范围的宽度和振动响应的幅度。本文进行的研究不仅提供了新型减震器的设计原理，而且证明了所提出的减震器在减轻钻井设备到平台船体的振动方面的巨大潜力。结果表明，所提出的系统可以有效地减小覆盖范围的宽度和振动响应的幅度。本文进行的研究不仅提供了新型减震器的设计原理，而且证明了所提出的减震器在减轻钻井设备到平台船体的振动方面的巨大潜力。