查询词典 transient time

As the complete characteristic curves of reversible pump turbine are often used to calculate the instantaneous parameters, this paper studies the characteristic curve and the wicket closure and opening law in pumped storage plants.Chapter 1 presents the importance and the necessity of this study and reviews the previous related research on hydraulic transient process and valve regulation in pumped storage plants.Chapter 2 analyzes the six collected characteristic curves of reversible pumped turbine and studies their diversification from the point of view of specific speed. The six collected discharge and moment curves with maximum efficiency have been fitted to piecewise continuous curves. This curve-fitting procedure is listed.Chapter 3 takes Liyang Pumped storage plant as an example and analyzes the effect of different characteristic curves on regulation guarantee parameters and the variety of its trochoid during the same operation status.Chapter 4 takes three pumped storage plants with different heads as examples and studies the characteristic of coordinated closure with wicket gate and ball valve and its effect on dynamic pressure in the spiral case, inlet pressure in the draft tube and the rise of rotating speed.Chapter 5 summarizes this paper and point out what should be done in the future research.

由于在过渡过程分析计算中，需要频繁利用可逆式机组的全特性曲线推求机组的瞬时参数，所以本文就特性曲线及关闭规律问题进行了研究，其主要内容如下：第1章，指出本文研究的意义和目的，回顾前人对水力过渡过程、抽水蓄能电站及阀调节的研究成果，在此基础上提出本文的研究内容；第2章，针对收集到的六套特性曲线，从比转速的角度出发来研究可逆式机组特性曲线的变化规律；并对六套曲线的最高效率流量和力矩曲线进行分段拟合，得到各分段函数的具体形式，再通过举例说明最高效率曲线的拟合步骤；第3章，以溧阳抽水蓄能电站为实例，分析讨论不同比转速特性曲线对调保参数造成的影响及对于相同工况其轨迹线的变化；第4章，结合高、中、低三水头段抽水蓄能电站，在导叶直线关闭的基础上，研究导叶与球阀协联关闭规律的特点及对蜗壳动水压力、尾水管进口压力及转速上升造成的影响；第5章，总结全文，提出今后研究的重点和方向。

The switch transient processis is an important nonlinear resistance phenomenonof wolfram lamp, the resistance of which will rapidly be increased with the tempreture of tungsten filament .

白炽灯钨丝的电阻随温度迅速变化引起的开关瞬态过程是一个很重要的，非线性电阻现象。

The simulation accuracy can be improved by above model for the turbofan engine transient performance.

上述模型的建立将有效的提高涡扇发动机过渡过程性能模拟程序的精度。

The mathematical model of turbofan engine transient process with thrust vectoring nozzle was established.

建立带矢量喷管的涡扇发动机动态数学模型。

Therefore, in the limiting case envisaged by the model unconditional convergence, where differences in productivity levels arise solely from transient "shock", productivity growth rates in any period would be found to vary inversely with their respective initial levels, so that laggards would tend to catch up with the leaders and differences in levels eventually would be eliminated.

国家倾向于追赶上领导者并且它们之间的差异将最终被消除。

Thirdly, based on the continuum model, the natural modes of undamped complex framed structures are proved to be orthogonal with each other in a generalized sense. This leads to an alternative method for transient response analysis of undamped framed structures via the expansion of normal modes.

再次，基于MRRM列式，从连续模型的角度证明无阻尼复杂框架结构的固有模态具有正交性，并以此为基础构造模态叠加法来求解无阻尼复杂框架结构的瞬态响应。

A state variable feedback based system control approach, which indirectly controls load voltage by means of controlling the supply current, is proposed, thus the problem that the undamped DC transient component of supply current, which is caused by the linking inductance between power supply and power loads under PI control mode, is solved.

分析了仅由1套逆变器构成的并联型综合电能质量调节器的结构特点和控制目标，提出了一种基于状态变量反馈的系统控制方法，通过控制电源电流来间接控制负载电压，很好地解决了常规比例–积分控制时电源和负载间的连接电感所导致的供电电流直流暂态分量不衰减的问题。

The undeformed chip thickness is then a variable in the milling cutter axis direction so the process is transient.

因此圆弧曲面铣削加工是一个动态切削过程。

Transient in change, and almost undistinguishable in the mingling of light, space, and motion, they have a logic structure that, with their complex composition, does not belong to the quotidian world of reality.

以光、空间和运动组成不能够确切地辩认的，变幻交错即现即逝，迷宫似的脉络雾霭构成不属于任何现实世界的逻辑结构。

In the modelling aspect, Boeuf and Garrigues have established the transient state unidimensional quasi-neutrality combination model, has calculated the electron current and ion electric current vibration [1] separately.

在建模方面，Boeuf 和Garrigues建立了瞬态的一维准中性混杂模型，分别计算了电子电流和离子电流的振荡[1]。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。