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本文详细分析了APF工作补偿原理,研究了常用控制算法,最后用MATLAB仿真软件搭建了仿真模型,给出了三种方法的仿真结果,进行了详细的仿真分析比较,验证了本文设计复合控制算法的有效性,给实际工程应用奠定了理论基础. 相似文献
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在介绍数据挖掘技术的基础上,讨论了数据挖掘的产生、定义、功能和可以挖掘的模式类型,讨论了数据挖掘的实施过程,分析并给出了实施有效挖掘的具体步骤,重点分析了其过程中的技术手段和核心环节。简要介绍了当前流行的数据挖掘系统,并且指出了现阶段数据挖掘技术的具体应用,最后提出了数据挖掘研究今后的发展趋势。 相似文献
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补给工作艇收放装置选型设计分析 总被引:1,自引:0,他引:1
工作艇是军辅船的常用设备,目前,国内对其在高海况下的安全收放问题尚无很好的解决办法.通过对"C"型单点起吊方案和"A"型双点起吊方案的对比分析、适用的状态分析,指出了各自的优缺点,同时在挂钩中设置了波浪补偿装置,综合考虑解决双点同步性的问题,从而保证了工作艇收放的安全性. 相似文献
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舰艇作战系统网络的鲁棒性分析 总被引:1,自引:0,他引:1
鲁棒性是现代军事网络的一个重要性能指标。采用复杂网络理论,对现代舰艇作战系统网络的鲁棒性进行研究,建立了一般舰艇作战系统网络拓扑图,在此基础上,探讨了舰艇作战系统网络在“随机失败”和“选择性攻击”两种网络损毁方式下的的鲁棒性,提出了一种改善舰艇作战系统网络受到“选择性攻击”时的鲁棒性的方法——“接种”法。 相似文献
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A new model for the simulation of spilling breaking waves in naval flows is presented. The hydrostatic pressure is used in order to mimic the weight of the breaker on the underlying flow, as in the model of Cointe and Tulin, whereas the algorithm for detecting the breaking inception and the definition of its geometry are completely new and are suitable for the simulation of three–dimensional flows around ships hulls. The model has been implemented in a finite-volume code developed for naval flows, and its performances have been validated against experimental data for a submerged profile, an S60 hull in drift motion, and the US Combatant DTMB 5415 model on a straight course. 相似文献
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A numerical model for the simulation of two dimensional spilling breaking waves is described. It is derived from a previous model which, in turn, takes its underlying ideas from the Cointe and Tulin theory of steady breakers. With respect to the former model, the present one is local, i.e., the inception, extension, and geometry of the breakers are determined through the local shape of the water surface. The model has been implemented in a RANSE code, which was developed for the simulation of ship flows, through a modification in the boundary conditions. This yields a simple and effective way to reproduce the breakers influence on the underlying flow. The resulting code has been used to simulate the flow past a submerged hydrofoil. The numerical results are compared with those of the previous model and with the experimental data obtained by Duncan. 相似文献
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介绍了气垫船变距空气螺旋桨的配重计算方法,编制了一整套计算程序,并在CATIA中进行了有关二次开发。利用CATIA中“测量惯性”功能获得配重的最大与最小转动惯量的精确值。实现了配重建模的自动化,AutoCAD中的配重二维图纸的尺寸更改可快速反映到CATIA中的三维立体模型,实现配重的优化设计。并以某一小型气垫实船举例,对其配重进行了计算分析。 相似文献
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近年来大型油轮事故引发了"避难地"的国际性法律问题.如何看待和正确处理这一法律问题已摆到许多国家的工作日程之上.在回顾"Erika"轮、"Caster"轮和"Prestige"轮事故所引起"避难地"法律问题的基础上,介绍了目前"避难地"问题的国际法律背景和世界有关国家涉及"避难地"方面的国家立法与观点等相关情况.同时,就"避难地"问题的本质、立法途径进行了讨论. 相似文献
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708研究所以“经济、安全、环保”(ESE)为宗旨,开发了适应双壳油船共同结构规范(CSR)的30.8万t VLCC船型。文中介绍了CSR对结构设计的关键要求以及对总体设计的部分要求,并着重对VLCC总强度储备、中剖面设计和粗网格有限元分析等关键技术进行了分析,以期初步阐明CSR对VLCC结构设计的影响。 相似文献
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An analytical formula for estimating elastic local buckling strength of a continuous stiffened plate subjected to biaxial thrust is derived considering the influence of plate/stiffener interaction and welding residual stresses. Through a comparison of calculated results with those by FEM eigenvalue analysis, high accuracy of the proposed formula is demonstrated. A series of buckling strength analyses is performed on the deck and bottom plating of actual ships. It has been found that:
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Author Keywords: Buckling strength formula; Stiffened plate; Biaxial thrust; Plate/stiffener interaction; Welding residual stress 相似文献