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Passive control of offshore jacket platforms

机译：被动控制海上夹克平台

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The wave-induced dynamic force is one of the most important excitations to be dealt with in the design of offshore structures. In order to perform a reliable design of an offshore structure, it is important to obtain an exact evaluation of its dynamic response but also to examine the ways of reducing the response. This paper presents the response of offshore jacket platforms installed with energy dissipation devices such as viscoelastic, viscous and friction dampers under wave loading. The offshore jacket platforms are modeled as multi-degrees-of-freedom system provided with dampers at each floor location. The wave forces are modeled as per Morison's equation. The governing equations of motion of the jacket platform with dampers are derived and their solution in the frequency domain is presented. The uni-directional random wave loading is expressed by the Pierson-Muskowitz spectrum. The response of the jacket platform with viscoelastic, visco.us and friction dampers is compared with the corresponding response without dampers in order to investigate the effectiveness of the passive control systems. It is observed that the additional dampers add substantial damping to structure and thus favorably control the response of platform structure. Among the various energy dissipation devices used for study, the viscoelastic dampers perform better in comparison to the other dampers. This is due to the fact that the added viscoelastic dampers contribute to increased viscous damping as well as lateral stiffness which reduces the response of the offshore jacket platforms significantly.
机译：波浪引起的动力是海上结构设计中最重要的激励因素之一。为了对海上结构进行可靠的设计，重要的是对其动态响应进行精确评估，同时研究减小响应的方法。本文介绍了在波浪载荷下安装了消能装置（如粘弹性，粘性和摩擦阻尼器）的海上护套平台的响应。离岸外套平台被建模为多自由度系统，在每个楼层位置都配备了阻尼器。根据莫里森方程对波浪力进行建模。推导了带有阻尼器的外套平台运动的控制方程，并给出了其在频域中的解。单向随机波载荷由Pierson-Muskowitz谱表示。将具有粘弹性，粘性和摩擦阻尼器的外套平台的响应与没有阻尼器的相应响应进行比较，以研究被动控制系统的有效性。可以看出，附加的阻尼器为结构增加了很大的阻尼，因此有利地控制了平台结构的响应。在用于研究的各种耗能设备中，粘弹性阻尼器的性能优于其他阻尼器。这是由于以下事实：增加的粘弹性阻尼器有助于增加粘性阻尼以及横向刚度，从而大大降低了海上护套平台的响应能力。

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