排序方式: 共有25条查询结果,搜索用时 437 毫秒
11.
12.
13.
14.
高可靠控制系统尤其是船舶控制系统,其可靠性设计是关键技术。作者总结了30年控制系统的设计经验并结合先进科技,提出了控制系统高可靠设计的四个基本原则,并以此设计成功ETN数据库现场总线及AutoNet(PCC)可编程监控平台。该平台兼顾高性能,在军船与民船设备中得到普遍应用,并在工业控制中也得到应用,为控制系统学科的发展提供了理论依据,可供控制系统设计研究人员参考。 相似文献
15.
16.
In recent years, demands for car transportation by a ship have been increasing with favorable economic conditions in auto
sector, and the need of a pure car carrier (PCC) has grown quickly. A PCC needs huge parking space but smaller displacement
since a car is comparatively light for its volume. As a result, almost all PCCs have wide breadth, shallow draft and huge
structure above the water surface. These features cause some technical issues of a PCC, like lack of stability, effect of
strong winds on its resistance, difficulty of course keeping in rough seas, difficulty of berthing in strong winds, and so
on. To overcome these technical issues, one of the authors has proposed a new concept for a PCC. This is a trimaran PCC which
has very limited transverse bulkheads in the center hull by using two side hulls as fenders. In the present research, wind
forces acting on a scale model of the trimaran PCC were measured in the towing tank with a wind generator at Osaka Prefecture
University. Furthermore, in order to clarify the characteristics of wind pressure on the trimaran, height and width of tunnels
which are between a main hull and side hulls were changed. And then, in order to imitate a real ship, we used wind reduction
technology of corner-cut design for accommodation house of the ship. Moreover, the wind pressure acting on the trimaran was
compared with that on a mono-hull PCC. Using these experimental and theoretical results, an estimation method of wind pressure
acting on the trimaran PCC is deduced. 相似文献
17.
旧水泥混凝土路面加铺沥青混凝土防反射裂缝实践 总被引:2,自引:0,他引:2
旧水泥混凝土路面加铺沥青混凝土改造工程的主要评价指标是防止或延缓反射裂缝的程度。通过3个旧水泥混凝土路面直接加铺沥青混凝土面层的工程实践,研充了该类工程防止或延缓反射裂缝的措施。针对旧水泥混凝土路面不同损坏提出了加固处理方法,使之达到设计承载能力和保持稳定性。通过对防水卷材、玻纤格栅、沥青砂胶的材料特性、路用性能、施工工艺的研究,以及经过目前的路况调查,对比施工前后的裂缝情况,证明这些措施有不错的效果。 相似文献
18.
安徽省六叶高速公路砼路改造工程的施工过程中,对影响沥青路面施工平整度的因素进行了认真分析,并在施工中严格加以控制,后经业主委托安徽省高速公路试验检测中心进行交工验收,平整度指标达到了0.6,取得了良好的效果。 相似文献
19.
20.
由于港口护岸衬砌工作条件特殊性以及材料使用单一性,常常因外部荷载的作用导致其破坏。在新型材料研究基础上,结合柔性水泥混凝土(FCC)材料自身的优越的自适应性能以及护岸结构受力特点,将柔性水泥混凝土引入港口护岸工程中,提出一种新型的护岸衬砌结构。通过数值模拟应用实例,对比上面层FCC厚度一定、下面层普通混凝土(PCC)厚度变化时,上面层与下面层中心点处应力-应变变化趋势。结果表明:柔性水泥混凝土(FCC-PCC)符合衬砌护岸满足护岸堤防设计的要求,而且在外部荷载的作用下应力-应变变化均较小,是一种实用的护岸衬砌手段。 相似文献