共查询到20条相似文献,搜索用时 78 毫秒
1.
为了改变锚唇曲面的传统设计方法,提出了一种新的设计思路。根据预期的拉锚时锚杆和锚爪与锚唇接触的运动轨迹,通过共轭包络原理推导出它们与锚唇接触处的曲面方程,利用MATLAB生成该曲面并获取其型值点,然后基于型值点完成整个锚唇曲面的设计。最后以30万吨超大型油轮的锚唇为例,利用该方法进行设计并验证其结果的有效性。 相似文献
2.
传统的船舶通常设置锚台(锚唇)或者锚穴,以便锚与锚穴或锚台(锚唇)很好地贴合,但如能利用船舶首部的结构外飘型线,通过不设置锚台(锚唇)或锚穴,而让锚冠及锚爪直接与外板接触,便能有效降低船舶的建造成本并缩短建造周期。然而这样对于船舶首部的型线设计、锚端链节设计、锚型式的选择、锚冠及锚爪接触处外板强度等要求都不同于传统。文章以国外示例,结合实船效果展示,对无锚台(锚唇)或锚穴的船舶锚系设计方法进行研究,通过逆向工程分析并充分利用三维仿真设计软件,在满足入级船级社规范要求的前提下,探索出无锚台(锚唇)或锚穴的船舶锚系设计方法。 相似文献
3.
4.
为了完善锚唇的设计理论和取消拉锚试验,按船舶正常航行情况,总结了锚运动受力状态、船体型线和文献[1]、[2]三者之间相互制约的规律.对锚理论对称平面的形状、锚链与锚唇表面经常接触点的确定、锚爪与船体表面间的力系简化等问题,进行了分析研究,从而提出锚唇的数学力学模型。实践表明,该模型效果良好。 相似文献
5.
对比了大型船舶中不同锚唇设计的巨大重量差异,借助力学分析,形成了基于锚链等级与规格且简单易用的锚唇设计厚度基准表。通过对日韩锚唇设计数据比较,贴切吻合更趋安全。该表的推广使用有助于我国船舶减重降耗,从而得以降低成本提升效益。 相似文献
6.
7.
8.
9.
10.
随着现代化造船事业的发展,为了尽可能增大船体货舱的舱容,艏艉尖的舱容需相应缩小.这种情况下,传统的锚唇已不能适应拉锚试验和船体锚系布置的需要.本文介绍了一种螺旋锚唇,不但可以解决上述难题,而且能加快造船速度. 相似文献
11.
12.
介绍了我国港口资源的整合现状,指出港口整合可以提升港口的形象和地位,也为区域经济和城市的发展注入强大的动力。最后指出在港口资源整合中要避免的几个问题。 相似文献
13.
广州集装箱码头的轮胎式场桥小车制动器使用10多年后,出现了许多问题,故进行了改造.分析了轮胎式集装箱龙门起重机小车制动器的主要故障现象,提出了改造方案,并加以实施. 相似文献
14.
本文对现有的选定球面轴承的三种工程方法进行了分析比较.引入了“合力系数”,并给出了合力方向上投影面积的精确解. 相似文献
15.
16.
17.
18.
分析柴油机故障中常见的机体裂纹故障原因,认为由于设计缺陷和管理及操作不当,易造成船舶柴油机缸体上的裂纹多发生在气缸套凸肩处。如不及时处理这些裂纹和故障,就会造成缸套的裂纹直至出现缸套漏水等严重后果,针对NANTAIQUEEN轮柴油机对该类型故障的检修提出具体措施。 相似文献
19.
20.
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. 相似文献