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quasi steady     
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  准稳态
     From the requirement of dynamic modeling and computer simulation of ship propulsion plant, the importance of building mathematical model of fluid coupling for research on the dynamic characteristics of ship propulsion plant is stated, and for using experimental curve of the fluid coupling-in the form of the input characteristic-as source data for quasi steady model.
     从船舶动力装置动态建模与仿真的实际需求 ,引出了其主要部件之一的液力耦合器数学建模在稳 /动态特性研究中的重要性 ,以及利用其试验曲线 (输入特性形式 )作为数据源去构建准稳态数学模型的困难之处 :寻找一种通用的数学表达形式 ,以实现 1液力耦合器在额定工况及其附近的试验曲线的内插与外延 ;
短句来源
     Boundary Element Methods for Solving Problems in Quasi steady state the Temperature Field
     用边界单元法求解准稳态温度场问题
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     Modified quasi steady state model of converters in transient simulation of hybrid AC/DC systems
     交直流系统暂态仿真中换流器的改进准稳态模型
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     Design of Quasi Steady State for Large Amplitude Maneuvering of Fighter
     战斗机大幅值机动运动准稳态设计方法
短句来源
     Because of its fast and flexible controllability, the voltage source converter (VSC) based high voltage direct current (VSC-HVDC) will be widely applied in power systems, so it is of practical significance to study the dynamic performance of VSC-HVDC in complicated power grids. The quasi steady state response of flexible HVDC system can be simulated in power system simulation software PSS/E.
     柔性直流输电系统(voltage sourced converters high voltage direct current,VSC-HVDC)因其快速灵活的可控性在电力工业中将有越来越广泛的应用,研究其在复杂电力网络中的动态性能具有工程实际意义,应用电力系统仿真软件PSS/E可模拟柔性直流输电的准稳态响应。
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  准定常
     It is verified that the method of quasi steady flow using the laminar flowmeter is effective in measuring instantaneous flowrate.
     通过瞬时流量积分求得的平均流量与用层流流量计实测的平均流量相比 ,得到了相一致的结果 ,这说明用层流流量计藉准定常流法测定瞬时流量是有效的。
短句来源
     The quasi steady flow method is applied widely for measuring the instantaneous flowrate, but its application is restricted by the similarity criterion Strouhal number which should be very small.
     准定常流法是测定瞬时流量常用的方法 ,但其应用受相似准则Strouhal数的限制 ,Strouhal数应甚小。
短句来源
     The mathematical equations of one dimensional ,quasi steady,chemical equilibrium are established for ram accelerator. The equations are solved by Gauss reiterative method. The performance curves of ram accelerator are calculated,and the characteristics of ram accelerator is analyzed.
     根据冲压加速器工作特点,本文建立了一维、准定常、化学平衡控制体的数学方程组,并利用高斯消去法进行数值求解,模拟出了冲压加速器的性能曲线,分析了冲压加速过程中物理量的变化规律,可为实验时选择预混气体组分提供指导.
短句来源
     The similarity criterion--Strouhal number Sr was derived from the substantive derivative in this paper. The Sr number is a limiting condition for applying of the quasi steady flow method to the measurement of the instantaneous flowrate.
     从物质导数的基本概念出发 ,导出了准定常流法的适用条件受相似准则 Strouhal数 Sr的限制。
短句来源
     For the first time, the influence of base plate and projecting angle on the formation of the jet has been considered By utilizing the one dimension quasi steady flow theory,the calculation formulas of the mass,moving direction and velocity are deduced for the jet that is formed in the colliding process of flyer plate against base plate under the condition of slant setting.
     首次考虑基板、抛掷角对射流形成的影响 ,利用一维准定常流体力学理论 ,推导了倾斜放置条件下复板、基板碰撞时形成的射流质量、运动方向和运动速度的表达式
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  拟稳定流
     Inver function transformation has been conducted on the approximation analytical solution describing the quasi steady radial flow dispersion in this paper.
     将描述拟稳定流径向水动力弥散过程的近似解析解进行反函数变换。
短句来源
  准稳定
     On the basis of the characteristics of inlet process of supercharged four stroke diesel engine, assuming that air flow is one dimensional quasi steady incompresseble flow during charge, the authors present a simplified dimensionless mathematical model for determining the optimum component size matching of the intake system, which brings about an improvement of fuel economy due to the increase of charging coefficient, and which is verified by the experimental results of Model 6160A supercharged four stroke diesel engine.
     本文根据增压四冲程柴油机进气特点,假定进气气流为一元不可压缩准稳定的流动,推导出用无因次参数表示的进气系统部件尺寸配合的简化数学模型。 按此方法确定的进气系统尺寸可提高充气系数而改善柴油机的经济性,并且已经为6160A型增压四冲程柴油机的试验所证实。
短句来源
     For the safe construction and operation of high arch dam,the concrete arch dam construction and operation procedure during 30 years in Jinping-1 engineering is simulated by finite element method. The results show the temperature duration,the distribution patterns of quasi steady temperature field and stress field of 300m grade high arch dam. Important reference is provided to designing and construction in the aspect of temperature control and cracking prevention.
     为了高拱坝的安全施工和运行采用有限元法模拟了锦屏一级工程混凝土拱坝的整体施工过程和30 a运行过程,结果揭示了300 m级高拱坝的温度历时变化过程、坝体准稳定温度场及应力场分布规律,对设计和施工具有重要的参考价值。
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      quasi steady
    We consider a quasi steady laminar axisymmetric flow of Bingham type under the assumption that the yield stress increases at a rate proportional to the internal power dissipation.
          
    The HRG process (also known as the low-angle silicon sheet [LASS] process) has been analysed from the standpoint of a quasi steady-state heat flow analysis, subject to the assumption of a parabolic ribbon cross-section.
          
    The oxidation consisted of an initial transient period in which a composite scale of NiO and Cu oxides formed, and a subsequent quasi steady-state regime during which parabolic growth of NiO determined the overall oxidation rate.
          
    The equations derived can be used for rapid estimation of the time, required to reach a prespecified fraction of quasi steady state plasma level during quasi-uniform multiple dosing.
          
    The Valensi-Carter, Ginstling-Brounshtein, and other quasi steady state models have been extended to include mixed control.
          
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    The relation between the basic currents of the low latitudes and the initiation of typhoons is investigated statistically and synoptically by means of recent aerological data. It is shown that about 80% of typhoons developed in the eastern part of the equatorical convergence zone between the equatorial westeries and trade wind of West Pacific Ocean. The equatorial westeries is a large scale and quasi-steady phenomeanon therefore it is probably reasonable to be called "basic current" and typhoons...

    The relation between the basic currents of the low latitudes and the initiation of typhoons is investigated statistically and synoptically by means of recent aerological data. It is shown that about 80% of typhoons developed in the eastern part of the equatorical convergence zone between the equatorial westeries and trade wind of West Pacific Ocean. The equatorial westeries is a large scale and quasi-steady phenomeanon therefore it is probably reasonable to be called "basic current" and typhoons are considered as vortices of smaller scale. There is a quite definite relationship between the time, position, frequency of the initiation of typhoons and the position, strength of the basic currents in the low latitudes. There is a quasi-periodical variation of the strength and position of the basic currents with a period longer than one month. This fact may be helpful for the extended forecast the initiation and development of typhoons.

    本文根据近年来的资料,对东南亚低緯度基本气流与台风发生的关系进行了統計与个例分析.結果指出,北半球夏季西太平洋极大多数台风发生在赤道西风与北半球信风間交界面的东端.赤道西风尺度大,比較稳定,可視作夏季低緯度基本气流,而台风可視为这种基本气流与另一基本气流——信风——間交界面上的涡旋.台风发生的时間、地点及次数与低緯度基本气流的位置及强度有密切的关系。低緯度基本气流的位置与强度具有一个月以上的长周期式振动,因而可供台风发生频率的中期預报参考.

    In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation. This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion. Therefore it may be concluded that the motion of these scales also proceeds...

    In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation. This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion. Therefore it may be concluded that the motion of these scales also proceeds slowly under the condition of quasi-balanced forces just as that the large-scale motion proceeds quasi-geostrophically. If, however, in some way this quasi-balanced condition is disturbed, there must be a mechanism to bring the motion back to the quasi-balanced state. For the meso- and small-scale motion the inertia force (velocity advection), the coriolis force and the force of pressure gradient are in quasi-balanced state.The process to bring the motion to the state of quasi-balance of forces is called adaption process and the motion under quasi-balanced state is called quasi-steady process. The physical nature of these two processes is discussed in this paper. For meso-scale motion it is shown that in the adaption process D>>ζ, and in quasi-steady process D ≤ ζ, where D and ζ are respectively the divergence and the vorticity.If at certain time the quasi-balanced state is brokendown in certain limited region, further development of this motion may be calculated as an initial value problem. The computation concludes that in the initial short interval of time the meteorological elements undergo vigorous change leading to the reestablishment of the quasi-balanced state and then the motion goes into quasi-steady state.The equations of quasi-balanced condition for the meso- and small-scale motion may be written asThis suggests that for the motion of this scale P-field should be analyzed instead of height or pressure field.

    在大型运动中有所谓地转适应的现象,本文研究了中小尺度运动中风场和气压场之间的适应问题。 由尺度分析可以发现:在一般中小尺度运动方程中,时间导数项较其中的各主要项小一个量极。因此可以认为中小尺度运动是在力的准平衡状态下进行缓慢的演变。当有某种原因破坏了这种力的准平衡态时,即有一种机制使运动回到准平衡来。这种准平衡态是惯性力(即速度平流)、科氏力和气压梯度力三者之间的准平衡。 由准平衡态的破坏恢复到准平衡的过程称为中小尺度的适应过程;准平衡态下的演变过程称为准常定过程。文中讨论了这两种过程中运动的物理性质。指出:对中尺度运动而言在适应过程中D>>ζ,在准常定过程中D≤ζ,这里D和ζ分别为散度和涡度。 设在某一有限的区域中,运动的平衡态受到了严重破坏,作为初值问题可以计算破坏以后运动的发展。计算结果表明:在短暂的时间内,气象要素有一急烈变化和调整,重新恢复准平衡态;时间稍长运动即进入准常定的演变。

    A three-dimensional axial-symmetric model of cumulus development is here presented, with consideration of the effect of condensation feedback on the field of motion. A computational scheme of the system of equations concerned is given. For a case with initial temperature disturbance 1℃ and the vertical lapse rate of circumstances is slightly decreased with height, a calculation computed by the electric computer shows that a cumulus with a thickness more than 5-6 kms could be developed in about 20 minutes. In...

    A three-dimensional axial-symmetric model of cumulus development is here presented, with consideration of the effect of condensation feedback on the field of motion. A computational scheme of the system of equations concerned is given. For a case with initial temperature disturbance 1℃ and the vertical lapse rate of circumstances is slightly decreased with height, a calculation computed by the electric computer shows that a cumulus with a thickness more than 5-6 kms could be developed in about 20 minutes. In the lower part of the cloud there is a moist-unstable region (a > 0) which becomes quasi-steady in its intensity and size. The field of motion and that of temperature are also approximately steady in this region. But in the upper moist-stable region of the cloud, the flow and temperature fluctuate greatly; in this region the convective element from the lower part of the cloud oscillates and gradually dissipates. All these characteristics are in accord with the phenomena observed in the atmosphere, i.e. the cumulus has a steady and flat base but an ever-changing top.

    本文给出了一个三维轴对称的积云发展模式,考虑了凝结对流场的反馈影响,并假定环境的温度递减率和相对湿度随高度减小。在电子计算机上求得的数值解表明:当大气中有1℃左右的温度扰动时,则在二十分钟以内就可以发展成一块5—6公里厚的积云。在积云下部形成一个变化不大的湿绝热不稳定区,流场和温度场在积云发展后期变化也不大。而在积云上部的稳定层结中,流场和温度场随时间变化则比较大,从云中下部上升的对流泡到顶部形成波动。这与观测结果是相象的。

     
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