船艏自由落体砰击载荷模型试验研究  

Experimental study of slamming loads on ship bow during free water entry

作　　者：司海龙[1] 赵南[1] 胡嘉骏[1] SI Hai-long;ZHAO Nan;HU Jia-jun(China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2020年第4期445-455,共11页Journal of Ship Mechanics

基　　金：高技术船舶科研项目(工信部联装函[2016]25号)。

摘　　要：本文对船艏自由落体砰击载荷进行了模型试验研究,根据不同的落体高度与入水角进行了多次试验,研究了落体高度、入水角等因素对入水速度、砰击载荷及结构响应的影响。研究结果表明:船体入水速度、砰击压力、结构响应等随着落体高度的增大而增大;模型入水过程中,各测量点砰击压力峰值发生时刻存在一定的时间差;结构响应峰值发生时刻也存在一定的时间差;由于斜升角较小,球鼻艏底部的砰击压力峰值最大;外飘区域的砰击压力最大值仅为球鼻艏底部的30%~50%;同一水线面上,从船艏模型艏端向艉端砰击压力峰值逐渐减小;对同一横剖面,外飘下部区域的砰击压力峰值大于外飘上部区域的砰击压力峰值;由于砰击压力对外界影响因素非常敏感,砰击压力与结构响应具有一定的离散性。Experimental investigation of slamming load on ship during free water entry is conducted under different drop heights and angles of water entry.The influence of both drop heights and angles of water entry on velocity of water entry,slamming load and structure response is analyzed.The result of the experiment in?dicates that the velocity of water entry,slamming loads and structure response increase gradually with the in?crease of the drop height.The time when both slamming pressure and structure response reach the maximum is different at different measurement points.The peak of bulbous bow slamming pressure is higher than those in other regions.The peak of the flare slamming load is only about 30%~50% of that of the bulbous bow load.Slamming pressure gradually decreases from the model bow to the model stern at the same waterplane.Slam?ming pressure of the bottom flare is higher than that of the top flare at the same section.Slamming is so sensi?tive to external factors that slamming pressure and structure response have some discreteness.

关 键 词：自由落体 砰击载荷 结构响应 入水角 

分 类 号：U661.1[交通运输工程—船舶及航道工程]