带浮囊的小型漂浮平台横摇幅值分析

Analysis of Rolling Amplitude of Small Offshore Floating Platform with Gasbag

为了完成海洋环境中的局部信息探测与海域封锁,提出了一种小型便携式水面无人漂浮平台,该漂浮平台由漂浮装置和主平台通过铰链连接组成,主平台通过测量自身角度进行平衡稳定,柔性连接的漂浮装置对平台提供漂浮浮力和初级减摇稳定。针对小尺寸漂浮平台的柔性连接方式,提出了一种将系统的柔性连接简化为摇荡回复力矩的仿真方法,采用三维势流面元法,分析了平台在三级海浪下的横摇运动响应因子和横摇运动响应谱。结果表明在三级海浪下,平台的有效运动幅值为5.43°,满足系统指标要求,系统能够通过软硬件进行有效调平。通过改变漂浮平台的重心高度和浮囊的直径,分析了系统参数对漂浮特性的影响。结果表明,系统横摇运动幅值随重心高度和浮囊直径呈U形变化,在重心3 022 mm和直径2 030mm处,系统横摇运动幅值达到最小;对于大长径比系统,重心高度对系统横摇运动幅值的影响程度远大于浮囊直径。结果可为小型漂浮平台进一步研究提供一定的理论基础。

In order to detect the marine information and blockade the sea area,a small portable offshore unmanned floating platform was proposed. The floating platform consists of the floating device and the main platform by flexible connect system. The main platform keeps balance and stability by measuring the angle of their own. And the floating device provides floating buoyancy and primary roll stabilization. For the flexible connection of small floating platform,a simulation method was proposed,that the flexible connection was simplified to swaying restoring moment. Using three-dimensional potential flow panel method,the rolling response amplitude operator and response spectrum of the platform under three waves were analyzed. The result shows,virtual motion value of the platform is5. 43°,and it meets the system index requirement. The system can be effectively stabilized by software and hardware. By changing the center of gravity height of the floating platform and the diameter of gasbag,the influence of system parameters on the floating characteristic was analyzed. The results show,along with the center of gravity height and the diameter of gasbag,the system rolling motion amplitude changes like ‘U',and when the center of gravity height is 1. 343 m,and the diameter of gasbag is 2 030 mm,the system rolling motion amplitude is minimized. For the large aspect ratio system,the influence of the center of gravity height on the system rolling motion amplitude is much larger than the diameter of gasbag. The result can provide a theoretical basis for further study of the small floating platform.