共查询到20条相似文献,搜索用时 710 毫秒
1.
2.
3.
4.
为精确控制装车机在装车作业中行走速度及其变化,用可编程控制器结合变频器来控制装车机的行走。分析了传统装车机行走机构变速控制存在的问题,提出采用变频控制技术。介绍了装车机行车机构变频调速系统的设计及其元器件的选择。实施后提高了行走机构的安全性、可靠性,而且提高了装卸效率,减少了能源消耗和维修费用,降低了劳动强度。 相似文献
5.
6.
7.
散货装卸除尘装车溜筒系统设计分析 总被引:1,自引:0,他引:1
<正>货物的散装运输是一种方便、快捷、高效、经济的运输方式,大宗散货的运输(如煤炭、水泥、粮食、木薯干等)在水路运输中占有很大的比重,多数港口均建有散货专用码头。在目前所采用的散装运输方式中,汽车自提形式发货方式仍占据很大的比重。在采用汽车自提形式发货装卸工艺系统中,汽车装车所产生的粉尘污染问题是各大港口所面临的一个重大难题。目前,在设计过程中普遍采用装车过程增加除尘系统、采用伸缩管等方式达到降尘、除尘的目的,但这些方式除尘、降尘效果都不是很理想。因此,应运而生的除尘装车溜筒 相似文献
8.
9.
10.
11.
12.
13.
Considering the deficiencies of the traditional monopile foundation for offshore wind turbines (OWTs) in severe marine environments, an innovative hybrid foundation is developed in the present study. The hybrid foundation consists of a traditional monopile and a wide–shallow bucket. A series of numerical analyses are conducted to investigate its behavior under the static and dynamic loading, considering various loading eccentricities. A traditional monopile with the same steel volume is used as a benchmark. Although the monopile outperforms the hybrid foundation in terms of the ultimate moment capacity under each loading eccentricity, the latter can achieve superior or the same performance with nearly half of the pile length in the design loading range. Moreover, the horizontal load and moment are mainly resisted by the bucket and the single pile in the hybrid foundation respectively. The failure mechanism of both the hybrid foundation and the monopile is excessive rotation. In the rotation angle of 0.05 rad, the rotation center is located at the depth of approximately 0.6–0.75 times and 0.65–0.75 times the pile length for the hybrid foundation and the monopile respectively. The increasing loading eccentricities can lead to increasing moment bearing capacity, increasing initial stiffness and upward movement of the rotation center of the two foundations, while decreasing load sharing ratio of the single pile in the hybrid foundation. Three scenarios are considered in investigating the dynamic loading behavior of the hybrid foundation. Dynamic response results reveal that addition of the bucket to the foundation can restrain the rotation and lateral displacement effectively. The superiority of the hybrid foundation is more obvious under the combined wave and current loading. 相似文献
14.
直流电回馈加载是一项广泛应用于电机试验、变速箱试验、发动机试验等的先进技术。本文首先阐述了直流电回馈加载的组成和工作原理,然后运用MATLAB软件分别建立了异步电机的直流电回馈恒转矩和恒转速加载的仿真模型,利用SIMULINK语言对系统进行了仿真,仿真结果证明了此方法是可行的。 相似文献
15.
通过对集装箱码头作业过程的分析,运用WITNESS离散仿真技术,将先进的装、卸同时进行的集装箱码头作业新工艺通过离散仿真技术呈现出来,建立装、卸同时进行新工艺下的模拟模型;研究装、卸同时进行新工艺下码头装卸资源配置,将上海洋山港的相关数据带入进行模拟运行,对模拟得到的数据进行分析得到集装箱码头需要配置的桥吊、龙门吊和集卡的合理数量,为集装箱码头实际运作提供理论依据。 相似文献
16.
伴随着当前整个航运业的低迷,各大造船企业纷纷转型升级寻求开发新型产品,大型集装箱船舶成为较受青睐的产品,高强度钢加厚板在大型集装箱船舶建造中应用非常广泛,钢板厚度也随着船载重量以及集装箱装货量的上升而越来越厚,这就要求加厚钢板的焊接需要采用有别于传统钢板焊接的工艺,并在焊接过程中严格控制焊接质量。文章主要就加厚FAO钢板的焊接工艺选择以及质量控制方法进行了分析。 相似文献
17.
18.
19.
针对传统装载仪因受互联网技术和图形处理技术的限制,大多数为单机版且无三维可视化功能现有的局限性,提出将Web技术应用到装载仪中以实现船舶与公司之间共享配载数据,达到实时监控和保障船舶安全航行的目的。采用Web技术、Java编程语言、液位在线监测技术、MySQL 5.5免费版数据库对船舶数据的存储与读取功能和Web图形库(Web Graphics Library,WebGL)的三维可视化功能,在Windows操作系统上开发一套船舶装载在线计算的软件。船员和岸上人员可登录软件进行计算、查看装载计算结果。将“互联网+”理念与船舶装载计算相结合,建立“互联网+船舶配载”体系结构对船舶航运行业的结构转型具有重要的意义。 相似文献
20.
This paper investigates the influence of initial distortion of 3 mm thin superstructure decks on hull girder response and fatigue assessment. Part of the traditional superstructure of a prismatic passenger ship is replaced by thin decks with initial distortion amplitude of 0, 1 and 2 times the IACS limit value for thicker plates, i.e. 0, 6 and 12 mm. Both geometrically linear and nonlinear finite element (FE) analysis is used. For reference also traditional superstructure with 5 mm plate thickness is analyzed. Thin straight superstructure decks give 43% of weight reduction and carry approximately 30% less load than corresponding thick straight decks in traditional model. The load that is not carried by thin decks is divided between other traditional decks. The redistribution of forces also happens at the deck level between plates, stiffeners, girders and longitudinal bulkheads. The presence of initial distortion with the shape of one half wave between web frames and stiffeners causes an additional few percent-decrease in forces carried. The results and conclusions are similar for hogging and sagging loading conditions and differences between geometrically linear and nonlinear FE analysis are very small. This means time saving since the panel loading for fatigue assessment can be defined from geometrically linear hull girder response analysis without considering the initial distortions. 相似文献