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舰船和水下航行器降噪效果模糊综合评估 总被引:1,自引:0,他引:1
以模糊理论为理论依据,运用模糊数学的综合评判工具建立数学模型,对水下航行器噪声控制的影响因素与影响效果之间的关系进行分析,以VisualC++和VisualBasic语文进行编程计算,对影响降噪的诸的综合影响效果有了定性的了解,并可对各种舰船的降噪效果模糊综合评估。 相似文献
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在深入了解集装箱船舶手工积载特点的基础上,遵循集装箱船舶积载原则,利用面向对象的程序语言VisualBasic邮计算软件,详细了软件实现中一些问题的处理及软件主要功能,并给出了计算实例。 相似文献
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本文结合笔者开发的一个多媒体展示系统(DGOAS)重点介绍以VisualBasic作为多媒体前端开发工具,以ACCESS数据库作为管理多媒体数据的后台数据库,设计一个多媒体应用系统的设计思想和方法。 相似文献
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江国和 《华东船舶工业学院学报》2000,14(2):40-45
在对柴油机故障原因和故障症状之间的关系进行分析的基础上,采用二级模糊综合评判方法对柴油机的故障进行诊断。利用Visual Basic 5.0软件,设计了对柴油机故障进行模糊逻辑诊断(综合评判)的专用软件,并利用该软件对一故障实例进行了分析。 相似文献
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舰船结构交互分析系统的研究 总被引:1,自引:0,他引:1
本文简要分析了以有限元法和边界元法为基础的舰船结构分析系统-CPFBMS,建立了基于知识和经验的交互前后处理系统。该系统可对多种经验的交互前后处理系统。该系统可对多种结构形式的舰船进行结构分析和校验,已应用于船舶结构直接设计和分析系统中。该系统在Microsoft Windows下运行,便于二次开发。 相似文献
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探讨高压氧(hyperbaricoxygen,HBO)治疗对急性颅脑损伤患者红细胞功能的影响。方法对34例急性颅脑损伤患者行HBO辅助治疗(0.2MPa下呼纯氧),观察其治疗前后红细胞C3b受体花环率(redbloodcellC3breceptorrosetterate,RBC-C3bRRR)和红细胞免疫复合物花环率(redbloodcellimmunecomplexrosetterate,RBC 相似文献
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一、三层客户 /服务器体系结构现代企业信息系统的开发正由传统的两层客户/服务器结构向三层客户 /服务器结构过渡。所谓三层客户 /服务器结构就是将应用程序的各个组件划分为三个层次 ,即用户服务层 (UserServiceLevel)、业务服务层(BusinessServiceLevel)、数据服务层(DataServiceLevel)。用户服务层即客户端界面 ,主要由各种窗体(Form)构成 ,负责与用户交互。这些窗体实际上是一些用户界面对象 (UserInterfaceObject) ,而不是业务对象 (BusinessO… 相似文献
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针对现代海战环境下数据的非结构化、分散、广泛、实时等特征,并参照英国海军ADDAM(ADistributed Database Application Management System)系统,提出了实时环境下海军分布式指挥和控制系统RNDCCS(Rintime Naval Distributed Command and Control System)。同时,详细讨论了实时环境下分布式数据管理遇到 相似文献
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《金康九四》(Gencon94)在装卸条款(Loading/Discharging)上有很大的修改,其最突出的一点是条款的名称不再仅是装卸费用,其还包括责任和风险。除此以外,修改主要集中在5个方面:(1)删除了GrossTerms(总承包条款);(2)在FIOST的基础上明确了船东不负责理货、绑扎或固定(tallied,lashedand/orsecured),明确了租船人提供垫舱(dunnage)的义务和卸货后清除垫舱的义务;(3)划分了船上装卸设备的责任;(4)规定了起重设备操作人员(winchmen/cranemen)的责任;(5… 相似文献
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The research performed in this paper was carried out to investigate the computational procedure to design seakeeping optimized ship hull form. To reach the optimized hull form, four stages should be done, which consists of: generate alternative hull form, seakeeping calculations, objective functions and optimization techniques. There are many parameters that may be determined in ship hull form optimization. This paper deals with developed strip theory for determining the seakeeping performance, genetic algorithm(GA) as optimization method, high order equations for curve fitting of the hull form and finally reaching to the minimum bow vertical motion in regular head waves. The Wigley hull is selected as an initial hull and carried to be optimized. Two cases are considered. For the first case, the only form coefficients of the hull(C B, C M, C W, C P) are changed and main dimensions(L, B, T) are fixed. In the second case both hull form and main dimensions are varied simultaneously. Finally, optimized hull form and its seakeeping performances are presented. The results of optimization procedure demonstrate that the optimized hull forms yield a reduction in vertical motion and acceleration. 相似文献
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为提高船体曲面生成和修改的便捷性、灵活性,提高船型优化设计效率,并且克服NURBS曲面表征船体曲面的一些不足,提出一种基于T样条技术的船体曲面参数化设计方法.将船体曲面特征参数分为全局、船首、船中和船尾4组,依据这些参数建立T样条控制网格,用单一的T样条曲面即可完成船体曲面和局部特征造型,大大减少了控制点数量.通过特征参数直接驱动船体曲面调整,使船型修改变得直观和简便,且更具有针对性.以典型水面舰船船体曲面表征为例,说明所提方法在船体曲面造型及修改方面的能力和优势,该方法可大大提高船型优化设计效率,具有较大的理论意义和实用价值. 相似文献
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This study presents a numerical method for optimizing hull form in calm water with respect to total drag which contains a viscous drag and a wave drag. The ITTC 1957 model-ship correlation line was used to predict frictional drag and the corrected linearized thin-ship theory was employed to estimate the wave drag. The evolution strategy (ES) which is a member of the evolutionary algorithms (EAs) family obtains an optimum hull form by considering some design constraints. Standard Wigley hull is considered as an initial hull in optimization procedures for two test cases and new hull forms were achieved at Froude numbers 0.24, 0.316 and 0.408. In one case the ES technique was ran for the initial hull form, where the main dimensions were fixed and the only variables were the hull offsets. In the other case in addition to hull offsets, the main dimensions were considered as variables that are optimized simultaneously. The numerical results of optimization procedure demonstrate that the optimized hull forms yield a reduction in total drag. 相似文献
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Ship hull deformation is one of the most significant influences on propulsion shafting alignment. Based on the calculation fundamentals of ship hull deformations, a new method of shafting alignment considering ship hull deformations is proposed in this paper. Ship loadings, wave loads and environment temperature differences in some extreme conditions, as well as elastic constraints, are simulated and applied to the finite element model of 76,000 DWT product oil tanker, so that ship hull deformations can be solved. Then, the deformations of the double bottom are converted to bearing offsets, which behave as boundary constraints for shafting alignment calculations. Taking the condition of light ship in calm water as a reference, the impact of hull deformations on shafting alignment is analyzed and optimized shafting alignment considering ship hull deformations is realized. 相似文献
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深V形船型对小型军舰快速性能的影响 总被引:1,自引:0,他引:1
本文根据500吨级圆舭形快速攻击艇的船长、船宽、排水量、甲板面积和舱内平台面积设计深V形线型。通过各种不同线型特征的V形船型的模型试验,分析船舯底升角、后体形状和浮心纵一位置对深V形性能的影响,可要深V形线型设计依据。 相似文献
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