排序方式: 共有24条查询结果,搜索用时 31 毫秒
1.
介绍了非线性动力学理论在船舶横甩研究中的应用,总结了近年来横甩研究的主要方法和结论,最后指出了横甩问题尚需深入研究的几个方面。 相似文献
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骑浪/横甩是IMO船舶第二代完整稳性的五种失效模式之一,是一种基于概率的稳性衡准,制定规范的目的是更有效地保障船舶在实海域中的航行安全,确保不发生稳性失效情况.本研究中,以IMO有关成员国提出的最新版骑浪/横甩薄弱性衡准草案为基础,基于自主开发的骑浪/横甩薄弱性衡准校核软件,针对围网渔船开展了样船计算和比较分析,研究IMO正在制定的骑浪/横甩薄弱性衡准方法对该类船型的适用情况,分析船型参数对骑浪/横甩薄弱性衡准的影响,为我国参与国际法规制定,提出针对骑浪/横甩薄弱性衡准的提案提供技术支撑和依据. 相似文献
3.
Naoya Umeda Akihiko Matsuda Masami Hamamoto Shiro Suzuki 《Journal of Marine Science and Technology》1999,4(2):45-57
A systematic method for assessing intact ship stability with a free-running model in a seakeeping and maneuvering basin is
proposed in this paper. Model experiments were carried out in extremely steep regular waves for a model drifting, running
in head seas, and quartering seas. This method was applied to two purse seiners, and efficiently identified thresholds in
metacentric heights for capsizing of these ships. These capsizing thresholds are compared with requirements of the IMO Code
on Intact Stability. This series of model experiments also confirms that capsizing at the threshold occurs only in quartering
seas, and shows that capsizing is caused by broaching, loss of stability on a wave crest, or bow diving.
Received for publication on Jan. 20, 1999; accepted on July 6, 1999 相似文献
4.
Naoya Umeda 《Journal of Marine Science and Technology》1999,4(1):16-26
To provide a theoretical methodology to predict the critical condition for capsizing due to broaching, a nonlinear dynamical
system approach was applied to the surge–sway–yaw–roll motion of a ship running with an autopilot in following and quartering
seas. Fixed points of a mathematical model for the ship motion and unstable manifolds of the fixed point near the wave crest
were systematically investigated. As a result, the existence of heteroclinic bifurcation was identified. With numerical experiments,
it was confirmed that this heteroclinic bifurcation reasonably well represents the critical condition for capsizing due to
broaching. Thus the nonlinear dynamical approach can be substituted for tedious numerical experiments.
Received for publication on Nov. 20, 1998; accepted on March 16, 1999 相似文献
5.
用应力释放法检测梁内力的探讨 总被引:1,自引:0,他引:1
应力释放法是检测梁的内力的有效方法,在工程经验的基础上,对应力释放法进行了描述,主要描述其方法、步骤。 相似文献
6.
CRC(循环冗余校验码)编码是数字信号传输中用得较普遍的一种差错控制编码.它不但可以用于纠正独立的随机错误,也可以用于纠正突发错误.目前已有的CRC校验算法程序很多,但往往只以一种生成多项式为例进行编写,缺少完整、通用性好、用户界面良好的应用软件.介绍了一种CRC通用校验测试工具的设计与实现过程,本测试工具将各种类型的CRC校验算法进行汇总,类型全、计算精度高、速度快、用户界面好、易操作. 相似文献
7.
在连通平面图上找Hamilton回路的一个方法 总被引:1,自引:0,他引:1
王慈光 《西南交通大学学报》1997,32(3):241-246
以图G的面为节点构造着色面状态树,用深度优选搜索法在状态树上找完全子树,以求对应的Hamilton回路。为了把图G的全部Hamilton回路都找出来,所需构造的着色面状态数的数目不会超过一个定值。 相似文献
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9.
扩孔锚杆属于岩土工程新技术,具有“延性破坏”特征、提高抗拔力、节约工程造价等优点。公路边坡支护均为永久性支护,普通锚杆受荷后不可避免出现注浆体开裂现象,采用端部承压式扩孔锚杆可有效地解决注浆体开裂及锚筋长期防腐问题。文中介绍扩孔锚杆的力学机理及端部承压式锚杆的施工方法,具体介绍扩孔技术应用于某高速公路边坡支护的工程案例,对扩孔锚杆技术在公路边坡支护推广应用、提高边坡支护水平具有重要意义。 相似文献
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