共查询到20条相似文献,搜索用时 78 毫秒
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船型设计是船舶总体设计中一项极其复杂且又重要的内容,船舶的结构设计、性能计算、总布置等都要以船型为依据,因此,如何实现船型参数化设计尤为重要。FRIENDSHIP系统为船型设计提供了基于Feature特征和仿真驱动设计的参数化方法和实现机制。在对船型参数化基本理论———特征参数、特征曲线和曲面生成等进行详细阐述的基础上,以某型船艉部裸船体为例,具体阐述了船型参数化的实现流程,以及以Feature、Curveengine和Meta surface为特征机制的船型参数化的具体步骤。以Feature特征为核心的船型参数化方法不仅能为船型曲面的快速建立提供技术支撑,还可以为性能分析和优化提供基础条件。 相似文献
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基于ADAMS的新型大功率离合器同步机构的仿真研究 总被引:1,自引:0,他引:1
某新型船用大功率离合器工作条件异常恶劣,其同步机构能否正常工作,直接关系到该离合器的工作性能及工作可靠性。本文利用ADAMS软件建立了同步机构虚拟样机模型,分析了同步机构动态接合特性,提出了今后研究的方向及设计改进措施。 相似文献
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船用柴油机性能评估对柴油机设计研发、关重件改进优化、性能提高具有十分重要的意义。为科学系统地对柴油机性能进行总体评估,本文针对柴油机八大性能指标,研究船用大功率柴油机主要性能指标的分解方法和各指标的响应关系。按照主要性能指标分解流程,完成柴油机性能评估系统的功能模块设计。开发基于Netty的用户端与服务器之间的通信框架,实现快速调用第三方专业计算软件以及与数据高频互传,大大提高了评估系统的数据响应和评估效率。以某型柴油机为例,对评估系统功能模块进行验证,为我国船用大功率柴油机实现“同步设计,同步评估”提供参考。 相似文献
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研究了一个新的混沌系统的混沌同步问题。基于Lyapunov稳定性理论,采用非线性反馈混沌同步方法,给出了该系统实现自同步的充分条件以及控制律参数的取值范围;结合参数自适应混沌同步方法,实现了该混沌系统与统一混沌系统的异结构系统快速同步。数值仿真证明了该方法的有效性。 相似文献
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基于知识工程理论和专家系统,综合运用多领域仿真、交互式用户界面、虚拟现实和数据库等技术,构建岸边集装箱起重机的数字化设计研发系统。该系统主要包括参数化驱动的三维设计模型、有限元分析模型、动力学分析模型和吊装分析模型等,通过运行结构的分析与优化、动力学分析、现场安装仿真等模块,可以实现虚拟样机的参数化驱动设计,大大减少了重复建模的工作量,该系统还可用于岸边集装箱起重机的创新设计、测试和评估。 相似文献
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基于eM-Plant的集装箱码头布局规划仿真研究 总被引:1,自引:1,他引:0
应用eM-Plant仿真软件对某集装箱码头布局的多种规划方案进行仿真,根据码头的作业流程及系统仿真的特点,设计了基于eM-Plant的仿真流程,建立了包括泊位子模块、道口子模块、堆场子模块、统计子模块的参数化仿真模型,通过对不同规划方案的仿真运行,并对仿真结果进行分析后,得到了较优的方案,为决策者提供有力的支持. 相似文献
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常微分方程具有一般数学的特点:抽象性、严密性,又具有本身的特点,即与工程技术紧密相连,实用性强.而常数变易法是解线性微分方程行之有效的一种方法。 相似文献
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This paper presents the uncertainty modelling of experimental results for a physical model of a tanker moored to a terminal inside a port. The physical model was built for an oil terminal at the port of Leixões in Portugal. The model incorporates the new modified port layout, as well as a future 300 m extension of the port outer north breakwater to enhance operational conditions. The physical model tests were performed on a scale of 1:80 in the Portuguese Civil Engineering Laboratory (LNEC). A generic mooring system of four mooring lines and two fenders is simulated using a nonlinear spring system. Decay tests are carried out to evaluate the natural periods of the moored model. Then, tests are carried out for the moored model in waves. The major aim of the experimental study is to obtain novel results for the wave elevation and direction at various locations inside the port, the ship motions at six degrees of freedom, and loads on mooring lines and fenders including the modified port layout. As the physical model measurements are subjected to different types of uncertainties, a systematic uncertainty analysis is carried out here, following ITTC guidelines and recommendations, to quantify all possible sources of uncertainties. The results are discussed, and several conclusions are reached. Based on the experimental results, the presented physical model study may replicate the results for waves and motions with uncertainties less than 9% of the significant amplitudes. The assessment of the applied nonlinear spring model reveals load predictions on the moorings, with uncertainties less than 4% of the maximum mooring loads. 相似文献
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麦哲伦(Magellan,Ferdinand),葡萄牙著名航海家和探险家.先后为葡萄牙(1505~1512)和西班牙(1519—1521)作航海探险。5个多世纪以来,人们对麦哲伦崇拜得很,都把他看作是世界英雄,因为他是第一个完成环球航行的航海家。这一创举实际上以无可争辩的事实证明了地圆说。从这个意义上讲,麦哲伦的确是 相似文献
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为优化某船用柴油机的燃烧室的"油-气-室"匹配,降低有害物排放,运用AVL Fire对原型燃烧室改用不同燃烧室进行额定工况模拟.结果表明,高低型双涡流室双缩口燃烧室能在上涡流室形成"飞轮效应",相对于原型燃烧室,不仅能增加功率,而且能降低Nox和SOOT的排放.对高低型双涡流室双缩口燃烧室设置不同的高低涡流室的半径比r/R和喷油夹角进行计算.结果表明:随着r/R从0.3增加到1.3,Nox和SOOT的排放量均先减少后增多;当r/R为0.7时,Nox和SOOT的排放量均最少.当喷油夹角为140°~165°时,随着喷油夹角的增大,Nox的排放量先减少后增加,随后再减少,最后又升高;SOOT排放量先减小后增大,随后再减小. 相似文献
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Characteristics of a bubble jet near a vertical wall 总被引:1,自引:0,他引:1
A numerical model of a coupled bubble jet and wall was built on the assumption of potential flow and calculated by the boundary integral method. A three-dimensional computing program was then developed. Starting with the basic phenomenon of the interaction between a bubble and a wall, the dynamics of bubbles near rigid walls were studied systematically with the program. Calculated results agreed well with experimental results. The relationship between the Bjerknes effect of a wall and characteristic parameters was then studied and the calculated results of various cases were compared and discussed with the Blake criterion based on the Kelvin-impulse theory. Our analyses show that the angle of the jet's direction and the pressure on the rigid wall have a close relationship with collapse force and the bubble's characteristic parameters. From this, the application range of Blake criterion can be determined. This paper aims to provide a basis for future research on the dynamics of bubbles near a wall. 相似文献
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