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Stability and Upsetting of Small High-Speed Boat

小型高速船的稳定性与镦粗

基本信息

批准号：
62420038
负责人：
NAKATO Michio
金额：
$ 7.17万
依托单位：
Grant-in-Aid for Scientific Research (A)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

The stability and the upsetting of a small high-speed boat were investigated, and the main results obtained are as follows;(1) The aerodynamic characteristics of the boat were studied in a wind tunnel. Sometimes, the upsetting moment caused by aerodynamic lift becomes very large if the boat jumps from the water surface.(2) The hydrodynamic forces and moment acting on the boat hull were measured in the various running conditions. From the experiments, it was found the boat is generally stable in the still water.(3) The flow phenomena in the boat bottom and the wetted surface area were observed with a transparent plastic model and it was found, the surface tension gives the important effects on the flow phenomena of small model.(4) A simulation study of maneuvering motion is attempted by formulating the equations of motion. This simulation available to solve specific problems.(5) The process of upsetting are, (i) the boat begins to jump caused by some disturbances on the free surface, (ii) during the jumping, the boat changes its trim and heel and the hull reseives comparatively large aerodynamic lift and moment, (iii) leaving the water surface, there is no stabilizing hydrodynamic force, then the boat goes to upset.

本文对某小型高速艇的稳性和倾覆问题进行了研究，取得的主要成果如下：（1）在风洞中对该艇的气动特性进行了研究。有时，由气动升力引起的倾覆力矩变得非常大，如果船从水面跳跃。(2)测量了在各种工况下作用在船体上的水动力和力矩。从试验中可以看出，该艇在静水中基本上是稳定的。(3)用透明塑料模型观测了艇底的流动现象和浸润面，发现表面张力对小模型的流动现象有重要影响。(4)通过建立运动方程，对机动运动进行了仿真研究。此仿真可用于解决具体问题. (5)倾覆的过程是：（i）自由水面上的扰动使船体开始跳跃;（ii）在跳跃过程中，船体纵倾和横倾发生变化，船体承受较大的气动升力和力矩;（iii）离开水面后，没有稳定的水动力，船体发生倾覆。