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propulsion systems
相关语句
  推进系统
    The Use of Simulation Technology in the Study of Naval Vessel Propulsion Systems
    舰船推进系统研究中的仿真技术
短句来源
    Marine gears for propulsion systems of high-speed craft
    高速船舶推进系统减速器
短句来源
    AC power propulsion systems have the requirements of high efficiency, low harmonics and noise.
    交流电力推进系统的设计需满足高效率、低谐波和低噪声的要求。
短句来源
    The result shows that compared with SPWM, SVPWM has the advantages of less harmonic distortion, lower switching losses and higher voltage availability ratio, which has provided a solution to the PWM generation of AC ship power propulsion systems.
    实验结果表明,与SPWM相比,SVPWM具有谐波畸变率低、开关损耗小以及电压利用率高等优点,为舰船交流变频推进系统的PWM方式提供了一种解决方案。
短句来源
    A Comparison of SVPWM and SPWM in AC Ship Power Propulsion Systems
    舰船交流电力推进系统PWM方式的比较
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    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
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    Neural Fuzzy Control and Their Applicationfor the Marine Propulsion Systems
    神经模糊控制及其在舰船动力系统中的应用
短句来源
    New Energy and Power Electronics and Their Application in Marine Electric Propulsion Systems
    新能源与电力电子在船舶电力推进中的发展和应用
短句来源
    Identification of Physical Parameters of Ship's Propulsion Systems
    舰船推进轴系物理参数的识别
短句来源
    In this paper four types of propulsion systems were tested and compared on the 104 total tonnage trawler of Shan Dong provice.
    以山东104总吨钢质拖网渔船为母型船,对其进行了四种推进装置的设计与分析论证,筛选出适应近海拖网渔船多工况的较佳推进装置。
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  propulsion systems
Mechanical and propulsion systems prognostics: U.S.
      
High-cycle fatigue (HCF), involving the premature initiation and/or rapid propagation of cracks to failure due to high-frequency cyclic loading, remains a principal cause of failures in gas-turbine propulsion systems.
      
This requires a further development of current diesel and gasoline engines as well as a careful look to alternatives like fuel cell systems or hybrid propulsion systems.
      
Increasing shortage on energy resources as well as future emission legislation development increase the pressure to develop more efficient, environmentally friendly propulsion systems for vehicles.
      
An analysis is made of the optimum motion for three possible propulsion systems: limited exit velocity, limited power, and limited thrust.
      
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For the purpose of saving energy, sails used as wind propulsive device for modern ships are reintroduced. Sail-assisted motorships, in which engine is the main propulsion system which the sails provide auxiliary propulsion, have been successfully developed abroad. According to statistical information, 15% energy saving can be obtained due to the use of sails, or calculated in another way, an average power gain of 0.3-0.4 HP can" be resulted from per m2 sail area. In China, research work in this field...

For the purpose of saving energy, sails used as wind propulsive device for modern ships are reintroduced. Sail-assisted motorships, in which engine is the main propulsion system which the sails provide auxiliary propulsion, have been successfully developed abroad. According to statistical information, 15% energy saving can be obtained due to the use of sails, or calculated in another way, an average power gain of 0.3-0.4 HP can" be resulted from per m2 sail area. In China, research work in this field has as well begun and results are being applied to actual ships.This present paper deals with the experimental study on aerody-namic performsnce of circular-arc sails. Based on test results, influence of sail form and geometrical parameters on aerodynamic performance is discussed. Available data and diagrams given in this paper will facilitate calculation of thrust lateral force, turning moment and help programing for automatic control of sails so as to optimally utilize wind energy.

为了节能的需要,在现代船舶上采用风帆推进装置的方案又被重新提出。在国外,已成功地发展了机主帆副的船舶(或称风帆助航节能船舶)。据统计,由于利用风帆而得到的节能效果约15%左右,每平方米帆面积平均获得的功率约0.3~0.4马力,我国也已开展这方面的研究工作,并准备用之于实船。 本文结合有关任务,对圆弧型风帆的流体动力性能进行了试验研究,探讨风帆的形式及参数等对空气动力性能的影响。文中给出的资料可供设计风帆时计算推力、横向力及编制风帆自动控制程序之用。

Model testing plays a very important role in the design and performance analysis of waterjet propulsion systems. In this paper, the procedure of wind tunnel tests for inlet and duct of waterjet propulsion systems is discussed, performance characteristics of inlet and duct such as velocity profile and total energy recovery were measured, appendage and inlet drag were also deduced from wind tunnel tests results. Static pressure measurements along the ramp and the lip were made to roughly predict cavitation...

Model testing plays a very important role in the design and performance analysis of waterjet propulsion systems. In this paper, the procedure of wind tunnel tests for inlet and duct of waterjet propulsion systems is discussed, performance characteristics of inlet and duct such as velocity profile and total energy recovery were measured, appendage and inlet drag were also deduced from wind tunnel tests results. Static pressure measurements along the ramp and the lip were made to roughly predict cavitation inception. Such tests were performed for flush inlet of waterjet propulsion system of a high speed boat at CSSRC. Figure 1 is the schematic plan of test rig. Some results obtained from the tests are shown in Figure 3 to 7. Figure 3 and 4 are the velocity distributions at inlet plane and circular pump inlet plane respectively. Figure 6 shows the static pressure distributions along the ramp and the lip. Head loss and inlet drag coefficients as functions of inlet velocity ratio (IVR) are shown in Figure 5 and 7 respectively. Serious separation at inlet plane was found at low IVR. Flow improvement devices such as boundary layer suction and vortex generators were also applied in order to improve the flow. As a result, reduction in head loss and improvement in flow field at inlet and in duct were achieved.

喷水推进器由于流动情况比较复杂,故试验研究至今仍是解决问题的重要途径。本文论述了对喷水推进器进口及管道进行风洞试验研究的方法,并用此方法对平进口型喷水推进器的进口及管道进行了试验研究,取得了有意义的成果,为今后设计性能好、效率高的平进口型喷水推进器提供了依据。

This paper, with reference to the general layout of the submersible, discusses in detail the interior equipment arrangement principles, the selection of power battery, the weight/buoyancy balance, the buoyancy material, the design of the discontinuous structure of the pressure hull, the construction of the hull and the selection of the propulsion system, etc.

本文从可潜器总体设计角度出发,对内部设置布置原则,科研蓄电池电源选用,重量、浮力平衡,浮力材料,耐压壳体不连续结构的设计,壳体加工制造,以及动力推进系统的选择等问题,进行了较详细的论述。

 
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