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propulsion
相关语句
  推进
    ON THE STUDY OF MAGNETOHYDRODYNAMIC PUMP SHIP PROPULSION
    船舶电磁流体动力泵推进的研究
短句来源
    An Exploratory Study on a Propeller Propulsion System with Greater Cavitation Number,Higher Rotating Speed and Higher Efficiency
    高空泡数高转速高效率螺旋桨推进系统
短句来源
    Axial Vibration of Marine Diesel-engined Propulsion Shafting System
    柴油机船推进轴系装置轴向振动
短句来源
    Effects of Slightly Reduced Afterbody Block Coefficient with Attached Bulbous Bow on Resistance and Propulsion of large Full Ships
    略减后体方形系数并加装球鼻首对肥大船阻力和推进的影响
短句来源
    ACCELERATION STATE DYNAMIC SIMULATION OF A GAS TURBINE PROPULSION SYSTEM
    燃气轮机推进系统加速过程动态仿真
短句来源
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  推进力
    The main contents and results are in the following:The six-degree-freedom differential equation of ships' motion was establishedconsidering the hydrodynamics and the propulsion of screw propeller. Taking intoaccount the large amplitude of rolling motion, the nonlinear differential equation ofrolling motion was obtained.
    主要研究内容和成果为:综合考虑流体动力作用以及螺旋桨推进力,建立了描述船舶空间六个自由度运动的一般运动微分方程,考虑横摇大幅运动,得到非线性横摇运动微分方程。
短句来源
    Analyzed the propulsion drive and resistance besides turn torque and the resistant torque of ships motion, Gave corresponding mathematics model;
    分析了船舶运动的推进力与阻力、转船力矩和阻转力矩,给出了相应数学模型;
短句来源
  推进技术
    Application and Trend of Electric Propulsion Technology for Commercial Ships
    民船电力推进技术应用及发展方向
短句来源
    Development of Foreign Ship Electric Propulsion Technology
    国外舰船电力推进技术发展概况
短句来源
    Full electric propulsion is a natural requirement of modern ship
    发展综合全电力推进技术是现代舰船发展的客观要求
短句来源
    Aspects of Electric Propulsion for Military Ships
    军船电力推进技术研发概况
短句来源
    Introduce of Ship Electrical Propulsion
    面向21世纪的船舶电力推进技术
短句来源
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  “propulsion”译为未确定词的双语例句
    The Finite Element Method of Transverse Ship Propulsion Shafting Vibration
    用有限单元法计算船舶轴系的横向振动
短句来源
    The Simulation Experiments and Analysis for Lateral Vibrations of Ship's Propulsion Systems
    船舶轴系横向振动的模拟实验与分析
短句来源
    Experimental Study on the Combined Computer Control System of Diesel and Propulsion of Sail-Assisted Ships
    风帆船机桨联合计算机控制系统试验研究
短句来源
    The Non-contact Measuring of Axial Vibration for Marine Propulsion System of Large Ships
    大型船舶主柴油机轴系轴向振动的非接触测量
短句来源
    Active Vibration Control Oriented to Propulsion System of Warship
    面向舰船动力装置的主动振动控制技术
短句来源
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  propulsion
Research on swimming by undulatory long dorsal fin propulsion
      
On the basis of observation and experimental data, a simplified kinematic model on locomotion of the undulatory long dorsal fin propulsion is promoted.
      
It is suggested that the undulatory long dorsal fin propulsion is an adaptation to swimming with high hydromechanical efficiency.
      
The Use of a Solar Electrojet Propulsion System for Jupiter Satellite Injection
      
Low-thrust flights from high-elliptic orbits are of considerable interest, since they allow one to decrease (compared to high-thrust flights) the propulsion consumption and to reduce the flight duration.
      
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The aspect of lines design is reviewed for a number of inland water towboats based upon some of the trial results of having draft below 1.2 m The paper first describes the principal dimensions, form coefficients, performance characteristics and other problems of these towboats, then analyses and investigates the lines design of shallow draft towboats. With reference to the inland waterways condition of our country, the fore body and after body forms of existing shallow draft towboats have been considered. In...

The aspect of lines design is reviewed for a number of inland water towboats based upon some of the trial results of having draft below 1.2 m The paper first describes the principal dimensions, form coefficients, performance characteristics and other problems of these towboats, then analyses and investigates the lines design of shallow draft towboats. With reference to the inland waterways condition of our country, the fore body and after body forms of existing shallow draft towboats have been considered. In view of the resistance and propulsion, the load water line, shape of sections, half angle of entrance, forms of tunnel and their effect on propeller were analysed and compared. According to the service performance of these towboats, a relatively adequate fore and aft boby form and a suitable type of tunnel are presented. The relation of principal parameters of hull with lines design is discussed. Further, in connection with lines design, the problem of stability and steering has been investigated. Finally, the author suggests that the following eoefiicients are expected: 1) Block coefficient 0.65 2) Prismatic coefficient 0.70 3) Midship section coefficient = 0.85~0.95 4) Waterline coefficient >0.8

本文根据我国一些建造数量较多或做过试航鉴定、吃水在1.2米以下的内河螺旋桨拖输,在线型设计方面加以总结。文中首先介绍了这些拖输的主要尺度、船型系数、性能指标、使用情况和存在问题。然后对浅水拖输的绕型设计进行分析研究。根据我国航道条件就现有浅水拖输艏艉线型形状进行了探讨,从阻力和推进观点出发对满载水线、横剖面形状、半进水角和各种墜洞以及它们对螺旋桨的影响等加以分析、比较。根据这些拖输在实际使用中的优缺点,提出比较适当的艏艉线型形状和墜洞类型。文中还探封了船体各种主要参数与线型设计的关系。讨论了各种主要尺度比、船型系数对阻力和推进的影响以及它们在浅水拖输设计中的常用范围。此外还讨论了与线型设计有关的稳性和操纵性问题。最后得出了简短的结论。

Due to the absence of common understanding among the naval architects,engine-builders and marine engineers,about the definition of marine diesel engine power rating,difficulties aroused by power deficiency in diesel-installations on board were frequently eneountered in service.This paper deals with diesel engine power rating from manufacturing and service point of view.The manufacturers should rate their engines into three ranks:maximum rating,nominal rating and over-nominal rating. The marine engineers should...

Due to the absence of common understanding among the naval architects,engine-builders and marine engineers,about the definition of marine diesel engine power rating,difficulties aroused by power deficiency in diesel-installations on board were frequently eneountered in service.This paper deals with diesel engine power rating from manufacturing and service point of view.The manufacturers should rate their engines into three ranks:maximum rating,nominal rating and over-nominal rating. The marine engineers should rate their auxiliary engines into two ranks,namely,normal service rating and overload rating,and their main propulsion engines into trial trip rating,maximum service rating and normal service rating.Scientific definifion of these ratings are explained and their empirical relati- ons are also given. The bases of nominal rating are standard ambiant atmospheric conditions and installation condi- tions.The author proposes that standard ambiant atmospheric conditions should be based on the mean conditions in the test shop of the most diesel engine factories throughout the country.However,the naval architects should rate their engines according to the particular conditions of the appointed navigation zone and the kind of service to be attained.Numerical data of ambiant atmospheric conditions and installation conditions proposed are:736mmHg.,20℃,70% humidity,and less than 150 mm WG vacuum in the intake air system,30~300mmHg back pressure in the exbaust system.The calculation method in practice for correcting nominal rating and specific fuel consumption according to the variations of ambiant atmospheric conditions differ largely one another.For non-supercharged diesel engines,new correction formulas according to constant fuel pump rack and constant fuel/air ratio respectively are recommended in the paper.The results of comparison of these proposed fornmlas with others in practice and also with published test data show that the recommended formulas are more reasonable,although the correction is still slighly too high. The ambiant conditions on board differ largely with those in test shop,so the determination of service rating depends upon the specification of ambiant atmospheric conditions in the machinery compartment.Three kinds of standard ambiant conditions in machinery compartment,for high sea,east- south sea and north sea-going ships respectively,are given in this paper.These numerical data are deter- mined by statistical method.In the determination of service rating,the influence of wear,rpm.,insta- bility and power reserve must be considered.Its empirical coefficients are introduced.Generally,the normal service rating for auxiliary engines is about 75~82% of the nominal rating from manufacturer and 70~99% for the main propulsion engines.

船用柴油机功率的定义在设计、制造和使用各方面缺少统一的理解,以致使用时常常出现柴油机功率满足不了需要的问题。本文提出船用柴油机功率分级应从制造及使用两方面分别加以考虑:从制造方面可分为最大功率、额定功率和超额功率三级;从船上使用方面,驱动发电机的付柴油机可分为持久功率及超额功率两级,而推进用的柴油机则应分为试航功率、最大使用功率和正常使用功率三级。本文给出了上述各种功率的科学定义和经验比例。额定功率的标定基础是标准大气条件和安裝条件,标准大气条件的选择原则应根据国内大部份柴油机车间的条件而定,而使用者別应根据具体航区和船的用途重新标定持久使用功率。本文建议的标准大气条件为736毫米汞柱,20℃和70%湿度,并提出进气系统真空度不超过150毫米水柱、排气背压应为30~100毫米汞柱。目前使用的各种额定功率及耗油率修正计算方法差别较大,本文对非增压柴油机分别按每循环供油量不变及燃烧空气过量系数不变两种情况提出了新的修正计算公式。运用本文介绍的公式计算结果与试验结果,比较表明本文建议的公式比较合理,但仍略偏于保守。船上机仓内的大气条件与工厂条件相差较大,投使用功率的选定应以机仓大气条件为准。作者根据统计提出适合在远...

船用柴油机功率的定义在设计、制造和使用各方面缺少统一的理解,以致使用时常常出现柴油机功率满足不了需要的问题。本文提出船用柴油机功率分级应从制造及使用两方面分别加以考虑:从制造方面可分为最大功率、额定功率和超额功率三级;从船上使用方面,驱动发电机的付柴油机可分为持久功率及超额功率两级,而推进用的柴油机则应分为试航功率、最大使用功率和正常使用功率三级。本文给出了上述各种功率的科学定义和经验比例。额定功率的标定基础是标准大气条件和安裝条件,标准大气条件的选择原则应根据国内大部份柴油机车间的条件而定,而使用者別应根据具体航区和船的用途重新标定持久使用功率。本文建议的标准大气条件为736毫米汞柱,20℃和70%湿度,并提出进气系统真空度不超过150毫米水柱、排气背压应为30~100毫米汞柱。目前使用的各种额定功率及耗油率修正计算方法差别较大,本文对非增压柴油机分别按每循环供油量不变及燃烧空气过量系数不变两种情况提出了新的修正计算公式。运用本文介绍的公式计算结果与试验结果,比较表明本文建议的公式比较合理,但仍略偏于保守。船上机仓内的大气条件与工厂条件相差较大,投使用功率的选定应以机仓大气条件为准。作者根据统计提出适合在远洋、东南海及比海航行的三种船舶之标准机仓大气条件;同时推荐了在送定使用功率计算中为考虑磨损、转速不稳性及功率贮备等因素所采用的系数。对于发电用的柴油机船上使用功率一般为额定功率的76~82%,对于推进主机则为70~79%。近年来,在我国船舶上,通常发现由于各方面对船用柴油机功率标定缺少统一妁理解,往往引起柴油机的实际使用功率超出其能力,以致引起柴油机超负荷、螺旋桨转速或发电量达不到设计要求,严重的甚至会引起发动机损坏。柴油机功率按不同大气条件的修正亦常常引起制造厂与验收部门的争执。这些问题虽然在我国有关标准中已作了某些规定,但仍有继续探讨的必要。本文着重对额定功率与使用功率的关系、标准大气条件的确定以及功率和耗油率按大气条件变化的修正等问题提出一些看法。

A new presentation form for the test result of ship-model propulsion data,i.e.the contours of Δz value difference,thrust difference and torque difference is presented.It shows full data of test result of ship-model propulsion and also provides a basis for extrapolation of any ship length. Based upon the curves of this new presentation,a method for comparing and analysing standard model test,geometrically similar models tests and ship trial results is introduced. For ship-model propulsion test,the...

A new presentation form for the test result of ship-model propulsion data,i.e.the contours of Δz value difference,thrust difference and torque difference is presented.It shows full data of test result of ship-model propulsion and also provides a basis for extrapolation of any ship length. Based upon the curves of this new presentation,a method for comparing and analysing standard model test,geometrically similar models tests and ship trial results is introduced. For ship-model propulsion test,the author proposes a new method in which both the velocity and revolution are variable.This method is organically combined with three current methods of Continent,England and U.S.S.R.and showing these three methods are special instances for the proposed method.The new method saves much time than current methods,and to some extent it solves the problem of boat-model propulsion test.

本文首先就模型推进试验结果提出一种新的表达形式即:模型△Z值偏差量、推力偏差量和扭矩偏差量曲线图。这种表达形式反映了模型推进试验结果的全部数据,并对任何长度实船情况的换算提出了依据。其次,根据这种表达曲线介绍了对标准模型、几何相似模型以及实船试验等结果进行分析比较的方法。接着,对模型推进试验又提出了新的变航速变转速法,即:各次试验点的转速与航速使之近乎成许多直线簇关系,这新方法能将国外现行的三种试验方法,大陆法(转速与航速要满足某特定关系)英国法(转速与航速无关系),以及苏联法(航速与转速无关系)有机地联系起来,并证明这三种方法都是新方法的特例情况,从而澄清了对这三种方法认为是互相独立的提法。同时,新的试验方法较之现行国外的三种方法要节省很多试验时间。最后,新方法在原理上解决了模型艇的推进试验问题。

 
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