查询词典 transient time

A mathematical model that describes the transient flow is developed based on the conservation law of mass momentum and energy followed in the course of transient flow process of gasliquid phases.

根据气液瞬变流动过程中所遵循的质量、动量和能量守恒定律，建立了描述气液两相瞬变流动的数学模型。

Using wavelet analysis to realize single-phase grounding protection is easy to produce misjudgement and missed sanction and the method using magnitude and direction of transient component to realize single-phase protection needs calculate frequency and phase of transient component accurately.

采用小波分析实现单相接地保护容易产生误判和漏判现象，采用暂态分量的大小和方向实现单相接地保护的方法需要准确计算暂态分量的频率和相位。

In order to solve the fault location problem, this paper analyzes the electric structure of automatic blocking and continuous power transmission line, investigating the transient characteristics of traveling waves generated by different fault in the lines on the basis of traveling wave theory. The results show that transient process of earth fault and short fault in neutral noneffective grounding systems produce aerial mode component of traveling waves with steadyparameters.

为了解决自闭/贯通线路故障自动定位问题，分析了自闭/贯通线路电气结构的特殊性，以行波理论为基础研究了接地故障和相间短路故障产生的暂态电压、电流行波特征，发现接地故障和相间短路故障都存在参数比较稳定的行波线模分量。

Normalized transient energy function ; transient stability assessment ; stability control

归一化能量函数；暂态稳定性；稳定控制

Abtract This paper presents researches into the on—line identification of dynamic parameters of synchronous generators and power systems. The work is mainly in the following two fields:Ⅰ On—line identification of transient and sub—transient parameters of synchronous generators A new corrected extended Kalman filter is developed, in which, a corrected term is added in the equation of the partial differentiation of the state variables with respect to the parameters.

本文研究了同步发电机和电力系统的动态参数的在线辨识，所做的工作主要在以下两个方面：一、同步发电机的暂态和次暂态参数的在线辨识本文提出了一个校正扩展卡尔曼滤波技术，在状态对参数的偏导方程中加入了一个校正项。

The spread paths of common mode and differential mode noises in an SMPS under electrical fast transient/burst are studied and discussed. Hereby for single transient pulse, the vector fitting method is adopted combining rational function approximation according to the tested waveform to construct the a mathematical modeling of frequency, then a pole-residue representation is obtained by partial fraction expansion, and the last step are to draw a state space description and equivalent circuit.

在分析开关电源进行电快速瞬变脉冲群骚扰试验时共模和差模噪声的传播途径的基础上，对于单个脉冲，根据试验数据采用矢量匹配法结合有理函数逼近构造得到频域下的数学模型，通过部分分式展开得到零极点表达式，并最终得到相应的状态空间方程以及等效电路。

Also the response amplitude will be changed with the initial conditions due to the nonlinear properties of the cables.Taking the bending stiffness, cable sag and cable inclination into consideration, the space vibration control of the cables using the visco-elastic dampers in cable-stayed bridges is investigated by joining the center difference method and the state space strategy. Both the maximum modal damping ration and the optimal damper size are obtained, then the practical suggestions are proposed for the design of the dampers. The space nonlinear vibration equations of the cable-damper system are derived, and anew hybrid method for solving the cable-damper system is presented by combing the Newmark method and Pseudo-force technology. According to the known properties of the cable-damper system, the nonlinear transient responses are analyzed under all kinds of excitations. Based on the transient response, the control effectiveness of the visco-elastic dampers is further demonstrated.

综合考虑了拉索抗弯刚度、垂度的影响，研究了粘弹性阻尼器对斜拉桥拉索的空间振动控制，联合中心差分方法及状态空间法，得出了拉索面内、外振动各阶模态可能达到的最大阻尼比及相应的最优阻尼器系数，并对斜拉桥拉索的阻尼器设计提出了参考建议：考虑拉索抗弯刚度、垂度及几何非线性，导出了索-阻尼器系统的空间振动非线性方程组，结合Newmark方法及伪力(Pseudo-Force)方法，创新地提出了求解非线性方程组的杂交方法，根据拉索-阻尼器系统的阻尼特性，在各种荷载作用下，对索-阻尼器系统的非线性瞬态振动响应进行了研究，从系统响应的角度更加直接地验证了阻尼器的控制效果。

Torg reported that 0 of 117 quadriplegics in the National Football Head and Neck Injuries Registry recalled a prior episode of transient quadriparesis, and 0 of the 45 patients originally studied in his transient quadriparesis cohort have subsequently suffered quadriplegia.

Torg 在国家的足球中的 117个四肢麻痹者中的 0个领导而且拥抱受伤记入取消了短暂的 quadriparesis 的一段之前的插曲，而且取消了 45位病人中的 0位本来研读他的短暂 quadriparesis 步兵大队已经后来遭受四肢瘫痪。

2D transient model for rapid laser remelt;2. A two-dimensional symmetrical transient model applicable to cold-start emission applications was integrated, which was solved by the finite volume method.

描述了三效催化器的流动、传热传质和异相催化过程，分析了催化器的径向热导率的修正方法，比较了尾气分别作为双组分和多组分混合物时对其组分扩散系数的影响，集成了可用于模拟三效催化器的冷起动性能和暖机性能的二维轴对称瞬态模型，模型采用有限容积法求解。

As one of the singular functions,step function plays an important role in the transient analysis of dynamic circuits and its definition is the key to analyze transient circuits.

1问题的提出如图1所示，阶跃函数是一种奇异函数，它在分析动态电路的过渡过程中具有重要的作用，而阶跃函数如何定义是正确应用它分析动态电路的关键。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。