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power losses     
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  功率损耗
     Based on the intrinsic characteristics of power grid and the analysis of power losses,node voltage amplitude and voltage phase,this paper obtains the expression ofΔPloss,ΔQloss,ΔU,Δδ and their relations to wheeling businesses.
     结合电网自身固有特点 ,通过对电网功率损耗、节点电压幅值和相角的分析 ,得到 ΔPloss,ΔQloss,ΔU,Δδ与转运业务的关系表达式。
短句来源
     Numerical calculation of power losses on cable coil
     电缆线圈功率损耗的数值计算
短句来源
     It can calculate the power losses of each feeder rapidly and correctly and provide reliable foundation for the analysis and management of the power losses in low voltage distribution network.
     该系统能适应弱环网等复杂的配网运行方式,并能快速准确地计算出低压配网中每条馈线的功率损耗情况,为低压配网线损的分析与管理提供可靠的基础。
短句来源
     By the study of the influence on the voltage to the transformers'power losses,this paper presents the conception of critical voltage spread load rate,which is used to decide the direction of the voltage spread.
     通过研究电压对变压器功率损耗的影响,提出了临界电压调整负载率的概念,用于决定配电变压器运行时电压调整的方向。
短句来源
     So a new condition characteristic is put forward that used to be monitoring transformer windings, i.e. power losses.
     找到了变压器在线监测特别是针对绕组在线监测的新特征量:功率损耗,并在电力局现场做了变压器绕组匝间短路试验。
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  功率损失
     meanwhile, about 30% power losses due to birefringence.
     同时,应力引起的双折射造成了约30%的功率损失
短句来源
     THE EFFICIENCY, POWER LOSSES AND DISCHARGE COEFFICIENT OF SUCKER ROD PUMP
     抽油泵效率和功率损失及排量系数的计算
短句来源
     The coupling coefficients and power losses of two graded index fibers due to radial offset and angular misalignment are considered as the experimental errors.
     对两段渐变折射率光纤的径向位移和角度失配的耦合系数和功率损失,本文按实验误差来考虑。
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     2. less voltage and power losses; 3. weakening the disturbance to communication; 4. no longer necessary to lower the bows when the trains are in movement, etc.
     与现行供电系统相比,它具有剩余负序低、电压损失小、功率损失小、通信干扰能自行削弱、多机牵引的重载(组合)列车在全线可不降弓通过等优点。
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     With the wall conditioning, impurities and radiation power losses are generally lower than those with boronization, and strong wall pumping and low hydrogen recycling occur in these tokamak discharges.
     在这种壁处理后的托卡马克放电中,杂质和辐射功率损失一般比硼化后更低,出现了强烈的壁抽气效应和低氢再循环特性。
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  损失功率
     Calculating Efficiency of Planetary Transmission Based on Dynamic Power Losses
     基于动态损失功率的行星齿轮传动效率计算
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     All flow parameters characterized by one-dimensional flow theory in the turbine stage can be calculated after solving a group of equations by using these static stream pressures and the results of performance testing, taking account of pressure rise due to the velocity slipping at the rotor inlet and by introducing a relation of power losses from the disc friction and windage.
     利用这些实测静压值和性能试验结果,顾及由叶轮进口速度滑移引起的压力升高值,引用了一个轮盘摩擦鼓风损失功率关系式,在解出一组方程后,算出了涡轮级内由一元流动理论表征的各个气流参数。
短句来源
     This paper presents the methods for calculathg the lift, output power,input power,ef-ficiency,various partial efficiencies,various power losses and discharge coefficient of thesucker rod pump in the pumping well.
     本文研究了抽油泵的扬程、输出功率、输入功率、(总)效率、机械效率、水力效率、容积效率、机械摩擦损失功率、水力摩擦损失功率、容积影响的损失功率和排量系数的计算方法。
短句来源
  功损失
     On the other hand,this mechanical simplification also brings lower efficiency(comparing with the stirling,the pulse tube has more heat and power losses)and inconvenience of phase angle adjustment.
     但结构上的简化带来了效率上的降低 (与斯特林相比存在更多的热、功损失 )和相位调节上的不便。
短句来源
     So,improving efficiency(decreasing the heat and power losses)and seeking more effective method to adjust the phase angle become an important task.
     因此 ,提高效率 (降低脉管制冷机的热、功损失 )和寻求更有效的相位调节方法就成为研究脉管制冷机的重要课题。
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      power losses
    The dependence of the power losses on the dislocation velocity is studied.
          
    The difficulties are related to radiation power losses due to imperfect matching in microwave channels and leakage of energy of electrons (acquiring an energy quantum from radiation and transferring it to phonons in the microbolometer absorber.
          
    Optical power losses in a thin-film waveguide on silicon substrate
          
    Running a plasma torch off design power can significantly alter power losses through the nozzle wall and subsequently change the species distribution at the nozzle exit.
          
    An increase in the power losses were found after changes in the electrical configuration of the deposition set-up.
          
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    This paper presents the structure of the five tilting pad journal bearings which is designed for an air turbo-compressor (DA930-121). Its specifications, production technology and 1:1 full-size test are discussed. The test rig and the test measurement instruments are also described. In addition, the test results of the vibration of the rotor and bearings, the oil flow rate, temperature and the power loss of the bearings are generally analyzed.

    本文介绍了为DA930-121空气透平压缩机设计的五块可倾瓦径向轴承的结构、 参数、制造工艺及1:1全尺寸试验的情况。介绍了试验装置及测量仪器。对转子及 轴承的振动、轴承的油量、温度和功率损耗的测试结果做了概略的分析。

    This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil...

    This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil film are greater and stability conditions are basically the same. With the same coefficients of load capacities, the oil flow for the turbulent operation will be a little greater or smaller, the power losses and temperature rises will be about thrice larger and the regions of stability will be slightly narrower. Thus the data for laminar operation may be used to estimate the stability performances for turbulent operation in case of lack of the turbulent data; (3) a comparison among several theories of the turbulent lubrication developed abroad more recently by Constantinescu, Ng and Pan, Aoki and Harada and Hirs. These theories have been examined and analysed. The result shows that the theory put forward by Aoki and Harada is the best of all. On the other hand the Hirs Theory is obviously unreasonable when it is used with large eccentricities; (4) suggestions and recommendations made to the manufacturer concerned: recommending the length diameter ratio should be chosen as 0.75, the elliptic ratios should be chosen between 0.5 and 2/3 and some kinds of grooves for oil outflow should be made in the region of the oil film rupture to reduce power losses; (5) a preliminary disoussion on the rational criteria for determining the flow regime in the oil film of an elliptio bearing. The materials in the paper may prove helpful in designing, calculating and experimenting with bearings for turbulent operation.

    本文主要介绍:(1)紊流工况下椭圆轴承的方程(雷诺、流量和阻力方程),计算框图以及计算中的几点考虑:紊流系数的选取;油膜破裂区阻力的考虑;紊流系数中的局部雷诺数R_h值;紊流流道中出现层流段的考虑等。(2)紊流工况和层流工况轴承性能差异分析。(3)紊流工况椭圆轴承的性能曲线和分析。(4)对某机组用椭圆轴承结构、参数的建议。

    In this paper the capillary and orifice-compensated multi-recess hydrostatic journal bearings without circumferential oil groove are studied. Starting with the equation of continuity of flow, through analyzing the characteristics of the bearing with any number of recesses, general formulas for calculating the pressure in each recess, load capacity or stiffness and power loss are derived, to be used in computer operations. The paper shows also the effects of some demensionless design parameters on the characteristics...

    In this paper the capillary and orifice-compensated multi-recess hydrostatic journal bearings without circumferential oil groove are studied. Starting with the equation of continuity of flow, through analyzing the characteristics of the bearing with any number of recesses, general formulas for calculating the pressure in each recess, load capacity or stiffness and power loss are derived, to be used in computer operations. The paper shows also the effects of some demensionless design parameters on the characteristics of bearings. With increasing shaft speed of rotation, heat evolution and temperature rise become a critical problem. Consequently, the optimum design with the aid of a computer has been resorted to, under the constraints of maxima load capacity and stiffness for a given recess geometry, with the total power loss as an objective function. In order to solve this problem, the penalty function method is applied to transform a constrained minimization problem into a seguence of unconstrained minimization problems. The optimum solution to the design problem is obtained by using Powell's method. Both the flow chart and the computer program in FORTRAN are worked out in detail.

    本文讨论毛细管节流和小孔节流的多油腔、无周向回油槽的液体静压向心滑动轴承,从流量连续性方程出发,对任意油腔数的轴承特性进行分析,导出油腔压力、承载量和刚度、流量以及功率损耗的通用计算公式,以便上机运算;说明了一些无因次设计参数对轴承特性的影响。由于轴的转速越来越高,轴承的发热和温升是个突出矛盾。为此,对给定的油腔几何尺寸,讨论在承载能力和刚度为最大的约束条件下,以功率损耗为目标函数,利用电子计算机进行最优化设计,用罚函数法将有约束最优化问题化为一系列无约束最优化问题,采用Powell法寻求最优解,编制了详细的程序框图和FORTRAN程序。

     
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