These new mechanisms for suppressing vibration in large diameter intake pipes and pumping systems has been developed for use in Floating Liquefied Natural Gas (FLNG) facilities. Like existing devices such as fairings and strakes, this mechanism is designed for practical use and has a flow path inside the pipe. The mechanism is designed to suppress vibration caused by both float motion and vortex-induced vibration (VIV) due to currents. Experiments were conducted using a scale model, and numerical calculations were used to evaluate the mechanism’s ability to reduce vibration. As a result, the natural frequencies of the pipes were analyzed, and it was found that the vibration damping mechanism, when installed at appropriate locations, can provide effective vibration suppression against the motion of the upper float and vibration caused by VIV due to currents over the entire length of the pipe, even at limited installation locations. On the other hand, it was found that the vibration suppression effect could not be achieved without appropriate positioning, and that the longer the pipe length, the more limited the vibration damping capability.

这些用于抑制大直径进气管和泵送系统振动的新机制已开发用于浮式液化天然气 (FLNG) 设施。与整流罩和列板等现有装置一样，该机构是为实际使用而设计的，并且在管道内具有流路。该机构旨在抑制浮子运动和电流引起的涡激振动 (VIV) 引起的振动。使用比例模型进行实验，并使用数值计算来评估该机构减少振动的能力。对管道的固有频率进行了分析，发现减振机构安装在适当的位置，可以有效抑制上部浮子的运动以及由于电流过大而引起的VIV振动。管道的整个长度，即使在有限的安装位置。另一方面，我们发现，如果没有适当的定位，就无法达到减振效果，而且管道长度越长，减振能力越有限。