cosmosworks在DF900型架桥机结构分析中的应用

利用solidworks软件中有限元分析插件cosmosworks对架桥机后支腿在最差工况下进行了应力分析。     

Solidworks 软件背景下大型实体建模方法的研究

以DF900型架桥机的虚拟样机的开发过程为例,结合solidworks软件,主要对其建模过程进行分析,提出了变异性设计方法前提下,对整体装配体建模时采用自下而上的设计方法,在子装配体中,采用混合装配建模方法的设计方法。     

基于Solidworks的桥式起重机主梁有限元分析

针对桥式起重机的结构特点,采用三维设计软件solidworks建立桥式起重机主梁结构的三维模型,并对其进行了应力分析与位移分析。分析指出主梁腹板截面突变处存在严重应力集中,降低了桥式起重机的承载力,对桥式起重机的正常运行过程存在安全影响。因此有必要在改造桥式起重机时,对主梁腹板进行特殊的考虑。     

两栖武器水上射击后坐运动规律研究

两栖武器水上射击时,全炮会在水上产生翻转、后移和下沉,后坐部分运动规律和后坐阻力规律与陆上射击时有很大差异.本文运用双重后座原理建立两栖武器水上射击时后坐部分和车体的动力学模型,并通过solidworks二次开发实时获取了水上射击时入水部分浮心和最大横截面积,从而对模型求解得出两栖武器水上射击的后坐运动和后坐阻力规律.结果表明,水上射击时后坐阻力以及后坐速度、后坐位移曲线较陆上射击时较为平缓,且最大后坐力明显下降.     

基于Filter的舰船网络访问权限控制软件设计与应用

针对原有舰船网络访问权限控制软件由于数据处理能力较差,造成权限控制有误差,易造成网络预警有效性较差的问题,设计基于Filter的舰船网络访问权限控制软件。使用数据同步技术,优化网络访问信息数据同步模块,提升软件数据分析能力。设计软件数据库,采用E-R结构与物理结构2种形式,实现软件数据处理能力。在软件中引用网络过滤器,根据访问权限匹配规则树对网络访问信息的计算与匹配,实现对访问信息权限的控制。至此,基于Filter的舰船网络访问权限控制软件设计完成。设定软件应用环节,与原有软件相比,此软件的有效报警次数高于原有软件,由此可知,此软件对于网络中访问的信息过滤与处理能力优于软件,使用此软件可提升舰船网络安全。     

云计算下航母抗干扰过滤软件稳定性测试方法

现有的航母抗干扰过滤软件稳定性测试方法存在着测试结果拟合度过低、准确性较差的弊端,为了解决上述问题,引入云计算技术对航母抗干扰过滤软件稳定性测试方法进行设计与研究。根据软件稳定性测试的需求采用采集卡对软件稳定性数据进行采集,主要包括软件操作数据与失效数据,以采集数据为基础,引入G-O非齐次过程构建软件稳定性测试模型,得到最终预测软件失效数量,以此为依据按照设定的软件稳定性测试流程实现了航母抗干扰过滤软件稳定性的测试。通过仿真实验分析得到,与现有的航母抗干扰过滤软件稳定性测试方法相比,提出的航母抗干扰过滤软件稳定性测试方法极大地提升了测试结果的拟合度与准确性,充分说明提出的航母抗干扰过滤软件稳定性测试方法具备更好的测试性能。     

浅析舰载电子装备软件保障的现状与对策

软件系统在新一代舰载电子装备中起到了至关重要的作用,为了保证电子装备的作战效能,必须提高软件的技术保障水平。文章从装备软件本身和软件保障的组织实施等方面分析了电子装备软件保障的现状,就如何提高电子装备软件的保障水平从装备软件的标准性和维护性设计、提升软件保障的技术手段和建立联合保障机制等方面进行了探讨。     

基于SFTA技术的数据库系统软件故障分析

在数据库系统中软件所占比例日益增加,软件故障对系统可靠性的影响也更显突出,需要对软件故障进行分析。根据数据库系统特点,采用故障树分析方法,以数据库系统的软件故障为根节点,由上而下分析导致软件故障的所有可能因素,分析其因果逻辑关系。最后,介绍了定性与定量分析的疗法。通过实例,建造软件故障分析树,分析了SFTA技术对提高软件运行可靠性的影响。     

面向开放环境的自适应软件构造方法

近年来,随着分布式软件的运行环境、内部结构以及应用模式的不断变化,如何构造开放环境下自适应软件已经成为软件工程领域的研究热点。在开放环境下,软件上下文环境及其变化可能会大大超出开发阶段的预期,要求软件基础框架必须与具体场景解耦,并且能够在线灵活调整软件的自适应能力。文中针对典型软件自适应概念模型的局限,设计了一种ASCM软件自适应概念模型。模型融合了个体和群体两个层面上的适应性,并且允许第三方在线调整,以应对开放动态环境的挑战。在此基础上,详细描述了如何构造开放环境下自适应性软件,即在基于软件个体复合控制过程上,给出了AS-CM构件模型、ASCM单元结构框架、在线调整等构造方法,具有环境和体系结构敏感且支持开放环境的效果。     

海岸河口多功能数学模型软件包TK-2D的开发研制

从工程应用角度出发,以解决实际工程问题为目的,针对海岸河口海区的特点,开发了方便有效的多功能数学模型软件包TK-2D。TK-2D由主模块和辅助模块组成。主模块包括五个子模块,即“五场”:波浪场数学模型软件、潮流场数学模型软件、盐度场数学模型软件、悬沙场数学模型软件和地形冲淤场数学模型软件;辅助模块包括前处理软件、后处理软件和动态显示制作软件。大量实际工程的应用证明了TK-2D的实用性和有效性。     

基于SolidWorks的大型成套装备的快速设计

快速设计是企业在全球化激烈竞争中保持领先的重要手段,文中探讨了基于Solid-works软件实现大型成套装备的快速设计方法,可供同行参考.     

基于CFD与三因次法结合的低速多用途船的阻力预报

为了实现对低速多用途船舶的阻力性能进行准确预报,提出将基于CFD的数值模拟与三因次法相结合的总阻力预报方法,采用Solidworks三维软件对某低速多用途船进行三维建模,依据Gambit软件对模型进行流域划分和网格划分,应用CFD理论选取合理的湍流模型和求解方法进行数值模拟计算,得到对应航速下船模的总阻力值系数,根据普鲁哈斯卡假设和三因次方法,利用最小二乘法拟合形状系数,进而计算出实船的总阻力,并且分析数值模拟的速度云图.最后与传统阻力估算方法-艾亚法进行比较,说明本文采用的阻力计算方法是可行性,给今后低速多用途肥大型船的阻力研究提供借鉴.     

Consistency in the development of performance assessment methods in the maritime domain

The maritime industry is considered to be a backbone of the global economy. It is therefore imperative to ensure that maritime operations run safely and efficiently. Assessment of maritime performance is necessary for designers and engineers to be able to pinpoint the weakest links in the system and make impactful system improvements. The current article presents a systematic quantitative literature review of research on performance assessment in the maritime industry with the goal of establishing an understanding of accuracy and consistency in the development of methods used to assess performance. The review focuses on four major segments within the industry—port logistics, ship handling, safety and environmental research—and investigates their uses in developing accurate and consistent performance assessment methods. After the completion of an exclusion process, 62 articles published in a wide range of academic journals were used in the analysis. Two important conclusions were drawn from the analysis. First, performance assessment is generally consistent throughout the maritime industry; most papers used accurate and consistent approaches to develop the methods (n?=?43). A subsequent bivariate analysis revealed a call for increased attention to the development of assessment methods within the maritime segment of ship handling. The current study suggests and discusses certain directions with regard to assessment research in the maritime industry.     

Evaluating the knowledge of experts in the maritime regulatory field

Regulations are introduced by the International Maritime Organization (IMO) into the maritime industry as the result of safety accidents and/or pollution incidents. When there is lack of historical data, then the IMO appoints experts in order to collect information regarding the costs and benefits generated to a stakeholder of the maritime industry once implementing a maritime regulation. Therefore, the role of experts in providing qualitative and quantitative information is crucial with respect to the quality of the maritime regulatory process within the IMO or other regulatory authorities. In this article, a methodology is proposed involving common criteria in determining the expertise of an individual in the maritime regulatory field. As essential part of the research methodology, analytic hierarchy process (AHP) is utilized to determine the expertise of an individual based on his/her own judgements. The regulatory authorities and other stakeholders of the maritime industry may use this method when selecting experts for decision-making. In this article, a simulation is carried showing the potentials of the AHP methodology in expertise evaluation followed by a case study.     

浅谈Williamson旋回在狭窄水域船舶掉头中的应用

大型船舶在港内狭窄水域掉头是一项高难度的航海作业.Williamson旋回是在救助常用的一种方法.介绍了Williamson旋回的操纵方法和特点.着重介绍了Williamson旋回的原理在狭窄水域操船中的应用及应注意的事项.     

中国海岸带综合调查初步成果

五十至六十年代结合沿海经济建设,先后对不同岸段进行过多次调查,并取得了一定成果。缝之,根据我国经济建设和海岸带开发的需要,于1980年开展了全国海岸带综合调查,并在调查基础上进行了各项开发试点实验,取得了不少成果。于1985～1987年沿海10个省市区先后完成外业调查和内业调查的整编,全国的最终成果正在编制中。本文对中国海岸带特征及其在国土开发中所占的重要地位;海岸带开发现况及其出现的问题,调查目的、范围、内容和成果要束以及调查取得的初步成果予以全面扼要介绍。     

浅谈目标管理在国有企业财务管理中的应用

介绍了现代管理方法目标管理之一后,分析了在企业财务管理中建立目标管理责任制,实行目标管理的必要性,并阐述了具体的一些做法,如更新经济核算观念,编制财务预算,形成企业财务目标、建立目标管理责任制等。同时提出了在实行企业财务目标管理中需要重视的问题。     

Analysis of the hydrophysical structure of the Sea of Azov in the period of the bottom anoxia development

The hydrophysical and hydrochemical structure of the Sea of Azov, with developed bottom anoxia, was studied during the RV “Akvanavt” cruise from July 31 to August 03, 2001. The anoxic zone with a thickness from 0.5 to 4 m above the bottom was found in all deep regions of the Sea. Concentrations of hydrochemical parameters were similar to the pronounced anoxic conditions (about 90 mmol m^− 3 of hydrogen sulfide, 17 mmol m^− 3 of ammonia, 6 mmol m^− 3 of phosphate, 7 mmol m^− 3 of total manganese). The hydrophysical structure was characterized by the uniform distribution of temperature in the upper 6–7 m mixed layer (UML). Below this a thin (0.4–0.8 m) thermocline layer was observed, just above the anoxic waters. Formation of this phenomenon was connected with that summer weather conditions. Intensive rains led to increased influx of river waters in June. That resulted in large input of allochtonous organic matter (OM) and inorganic nutrients; the latter were consumed on the additional autochthonous organic matter production. In July the weather was characterized by a significant rise in the daily averaged air temperature and large oscillations of temperature during the day. In this period a wind of constant direction was absent, but wind bursts were observed. The completed analyses showed that the formation of such a structure could be connected with the following factors: (i) positive growth trends of the daily averaged temperature and the daily oscillations of temperature, (ii) presence of wind bursts. The joint action of these factors resulted in the formation of the UML. The amplitude of wind bursts determined the depth of UML, and the value of trend determined the value of the temperature change in the thermocline. An initial presence of bottom halocline (caused by the Black Sea water influx to the bottom of the Sea of Azov) prevented the heating of the bottom layer and therefore led to an increase of vertical gradient of temperature in the thermocline. The spatial distribution of the turbulent exchange coefficient confirmed the existence of a “stagnation” area located above the anoxia zone, which is also, apparently, the reason for its occurrence.     

Seasonal changes in the positional importance of components in the trophic flow network of the Chesapeake Bay

Community-level processes may shape food web structure. In this paper, a graph theoretical study of the weighted trophic flow network of the Chesapeake Bay ecosystem shows how important are positions in the energy (carbon) transport system. The positional importance of components is compared to the quantity of energy flowing through them. We suggest that the congruence between important network positions and large flows refers to the larger role of trophic interactions in community control. A seasonal dynamical analysis of the network has led us to the conclusion that winter is the season when the importance of predation is the highest.