查询词典 dynamic system

This article deeply discusses the procedure of develop and the related techniques of the Ticket-selling system. By using dynamic pages, database and data structure to work out the solution of the Ticket-selling system. The whole system includes two main modules: the queries and the book of tickets and the management of system.

本文详细介绍了铁路订票系统开发过程及其相关技术，运用动态网页、数据库、数据结构等技术，提出了订票系统的解决方案，将整个订票系统按用户的不同分为前台查询、订票和系统管理共两个主要的功能模块。

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

Described are the composition and functions of the new infrared inspection car in Ji nan Railway Bureau,the infrared dynamic inspection equipment,the relative deviation of wheels as well as the working principles of the suspended object monitoring system and HTK-2003 type AEI equipment dynamic inspection device,and the application prospects of the car.

介绍了济南局新红外线检测车的构成及功能，红外线动态检测设备、车轮相对偏移以及垂下品监测系统、HTK—2003型AEI设备动态检测装置的工作原理以及该车的应用前景。

In this thesis, we improve the existing rendering algorithm and propose a power-aware system architecture including three key modules: dynamic task dispatcher, dynamic task scheduler, and 2-stage precision-aware processor array.

在本论文中，我们改良了既有的绘图演算法，并且提出了具备功率感知功能的系统架构。其中包括三个关键模组：动态资料流分派器，动态资料流排程器，以及具备精确度感知的处理器阵列。

The dynamic test system based on PXI bus consists of machine-box, controller, dynamic collect board and signals measure modulation.

基于PXI总线的动态测试系统，由机箱、控制器、动态采集板及信号调理模块组成。

Heart is one of the most important organs in the human body. It is very complex and changeful nonlinear dynamic system, which was recorded by dynamic electrocardiogram.

心脏是人体中非常重要的器官之一，是一个极其复杂多变非线性动力系统，动态心电图的变化反映了心脏的活动。

Based on the equilibrium equation of an arch element the cubic nonlinear dynamic model with second order is established and the nonlinear differential dynamic system without constant term is obtained through a transfer process of T=U+b. Hence three fixed points and the homoclinic orbits are found. The critical condition of the chaotic vibration of the elastic arch is given by using the method of Melnikov function. The numerical results of the stationary and chaotic motion are given and discussed.

首先利用拱的单元平衡方程建立了拱的二阶三次非线性动力学模型；然后通过变换使方程转化为不含常数项的非线性微分动力系统，并由此得到无扰动系统的3个不动点与同宿轨道；再用Melnikov函数法给出了发生混沌的临界条件；最后给出了该系统出现定常运动和混沌运动的数值结果。

Firstly, this paper researched the mechanism of tubing string vibration when natural gas flows in horizontal well tubing string. Secondly, established whole tubing string undamped and damped vibration system model according as reasonable assumption data of one horizontal well. Apply finite element analysis software to calculate tubing string natural characters, simple harmonic dynamic behavior of stable gas production and nonlinear dynamic behavior. Finally, this paper carried out the safety varied frequency of gas well and the method of vibration reduction.

本文首先从理论和数值模拟研究了天然气在水平井油管柱内的流动诱发油管柱振动的机理，然后在合理假设的基础上结合某水平井数据建立了全井段油管柱无阻尼和有阻尼振动系统模型，利用有限元软件计算分析了油管柱固有特性、稳产简谐动力学响应和非线性动力学响应，针对油管柱振动规律提出了天然气安全调节频率范围和减振措施。

Based on specific model, this thesis discusses the static and dynamic character of DEH system and analyse the main factors that influence the dynamic character.

针对具体模型对DEH系统的动态和静态特性进行了全面的讨论，分析了影响DEH动态特性的主要因素。

The dynamic model of flexible multibody system is derived by first kind of Lagrange equation and also the constraint equations for velocity are obtained, the final expression of the dynamic equation is hybrid one of algebra and differential.

首先利用第一类Lagrange方程建立了多柔体系统的动力学模型，并建立了速度意义下的约束方程，方程的最终表现形式为微分／代数混合方程组。

Green function defined inphase space differs from one in coordinate space by its struc-ture which exhibits nonlocatity in coordinates and oscillatorybehavior with respect to momenta.

在相空间中定义的Green函数不同于通常坐标空间的Green函数，在结构上显示出对坐标的高度非局域性，而对动量则显示出振荡行为。

The upper front part of a saddle;a saddlebow.

前鞍桥马鞍前面的上部分；前鞍桥