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  real ship
We present an optimisation-based solution approach for a real ship planning problem,which is a combination of a variant of the multi-vehicle pickup and delivery problemwith time windows (m-PDPTW), and a multi-inventory model.
      
If however a planning is made based on a real ship density, changes in speed remain small.
      
In real ship plating, however, such ideal edge conditions may never occur due to rotational restraint by support members along the plate edges.
      
In real ship plating, idealized edge conditions such as simply supported or clamped however may never occur because of finite rotational restraints.
      
Second, the surface of a real ship is not always flat, and surface curvature effect should be estimated.
      
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  full scale ship
As the resistance of a full scale ship cannot be measured directly, our knowledge about the ships resistance has to be gathered from model tests.
      
From this data we can compute the non-dimensional resistance coefficient and estimate the powering and resistance of the full scale ship.
      
First compute the appropriate model speed to represent the full scale ship at 20 knots.
      
The full scale ship length is 70 meters and full scale ship speed is 10 knots.
      
  full-scale ship
A comparison between the derived formula and existing expressions is made for largescale box girder models, a one-third-scale frigate hull model, and full-scale ship hulls.
      
It is postulated that these short bow waves are responsible for the white-water instability commonly observed ahead of a full-scale ship.
      
Prior to William Froude, there was no known scaling technique to equate ship model to full-scale ship resistance.
      
These early model tests revealed that there was no simple scaling procedure to convert model-scale resistance to full-scale ship resistance.
      
The first computations of turbulent flows solving the RaNS equations at full-scale ship Reynolds numbers were carried out in the early 1990s.
      
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  actual ship
Derivatives obtained from the tests were used to simulate the turning trajectory of the actual ship, and these were compared with the results of sea trials.
      
Two performance indices are minimized: one measures the time integral of the squared course deviation between the actual ship course and a target course; the other measures the time integral of the absolute course deviation.
      
Several smooth ship hullform surfaces generated from curve networks corresponding to actual ship hullforms demonstrate the quality of the method.
      
Direct reports from ships, crew and captains are the most reliable source of information on an actual ship strike incident.
      
For objective verification, actual ship observations were compared to model run data.
      
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测量实船马力是一个历史悠久的问题,半世纪以来人们先后设计出利用各种原理的扭力仪达数十种之多,本文将迄今为止所见到的扭力仪分门别类,归纳为机械、光、声、电、磁等各种型式,并将其中有代表性的作一有系统的介绍,说明各该仪器的优缺点。本文也指出船舶上使用的扭力仪所必须具备的待点,如结构方面必须坚固,牢靠,耐震,在使用方面必须简便,使一般人员都能操作管理。此外,又着重指出在设计时所必须特别注意的机械装置问题,因为有好几种扭力仪的试造失败,是由于太偏重了拾微器部份,而忽视机械装置所引起的。作为一个实船扭力仪的具体例子,本文介绍了在船模试验所里试造的那一种电感式扭力仪。这套扭力仪是专为船舶工业管理局设计建造的250马力渔船上应用的。

In order to approach the world level of shipbuilding,science within twelve years,it is necessary to survey the recent development in shipbuilding research of some leading maritime countries.This paper starts with stating the achievments of shipbuilding research work in this himdred years and steps taken by some leading countries for further development after the World War Ⅱ.Then it goes on to discuss the main achievments in the field of ship hydrodynamics and ship strength in recent years,and these are subdivided...

In order to approach the world level of shipbuilding,science within twelve years,it is necessary to survey the recent development in shipbuilding research of some leading maritime countries.This paper starts with stating the achievments of shipbuilding research work in this himdred years and steps taken by some leading countries for further development after the World War Ⅱ.Then it goes on to discuss the main achievments in the field of ship hydrodynamics and ship strength in recent years,and these are subdivided into the following headings: Ship hydrodynamics:(1)Systematic model testing.(2)Model-ship co-relalion, (3)Theory of wave making resistance,(4) Systematic testing of model propellers, (5)Propeller theory,(6)Cavitation,erosion,Singing of propellers,(7)Ship motion and seakeeping quality. Strength of ships: (1) Strength testing of actual ships and stress measure- ments on sea way,(2)Strength testing in model tank,(3)Problem of long superstructure,(4) Elastic and plastic strength of ship plating,(5) Ship vibration, (6) Materials for ship construction. This paper also gives an account of the preliminary achievments of the Chinese shipbuilding research work in respective fields and expresses the opinion that a great deal of amount of work is left to be done for the Chinese naval architects.Finally,the paper suggests that China must redouble her effort to construct her main shipbuilding research base equiped with instruments and apparatus of highest quality and to train the research experts as quick as possible.

为了在十二年内争取赶上世界的造船科学水平,就有必要对世界各国造船科学研究的发展,进行一番探讨。本文首先说明造船科学在百年来所起的作用,和二次世界大战后各国对造船科学研究的组织和发展。进一步探讨了二次大战后在船舶流体力学及船体强度学两方面的主要成就。并分以下几部份叙述: 船舶流体力学方面:(1)关于船型的系列试验;(2)关于船模与实船的换算关系;(3)兴波阻力理论;(4)推进器系列试验;(5)推进器理论;(6)推进器空泡、剥蚀、唱音等问题;(7)船舶运动和适航性。船体强度学方面:(1)实船强度试验和航行中应力测量;(2)船模试验池中的强度试验;(3)长上层建筑问题;(4)船体钢板的弹性塑性问题;(5)船体振动问题;(6)造船用材料问题。文中也涉及一些我国造船科学研究的初步收获,并说明我国在整个造船科学领域中还留着很大空白面。为了进一步发展我国的造船科学研究;建设主要的研究基地,充实仪表设备和培养研究人员是刻不容缓的事。

During the recent years, the coastal shipping in our country becomes more and more increasing in accordance with the high tide of our economical construction, and hence, the study of coasters plays an important role in our research work.The paper gives results of experiments made with models of 5000-tons coasters. The forms of fore-body and aft-body, position of longitudinal centre of buoyancy, length, & breadth are systemmatically varied, with a view to investigate the influences of the individual factor on...

During the recent years, the coastal shipping in our country becomes more and more increasing in accordance with the high tide of our economical construction, and hence, the study of coasters plays an important role in our research work.The paper gives results of experiments made with models of 5000-tons coasters. The forms of fore-body and aft-body, position of longitudinal centre of buoyancy, length, & breadth are systemmatically varied, with a view to investigate the influences of the individual factor on the resistance.Fifteen models are made. and the test results are all converted into EHP and ■400' curves. The ■400' curve of a similar foreign coaster which has been tested in the same tank is also given for comparison.

本試驗以5000吨沿海货輪为对象,分別变更艏艉截面形状,纵浮心位置,长度和寬度,进行系列化船模阻力試驗,研究各不同因素对阻力的影响。文中除将试驗結果归納成实船有效馬力和(?)400’等各种图表外,並列入一艘类似尺度的国外5000吨貨輪的試驗資料,以資比較。对我国制訂标准船型的工作,将为一很好的参考。

 
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