高压电动机无功就地补偿装置开发和应用的若干问题

从实践出发，介绍高压电动机无功就地补偿装置的应用情况、量化分析，并就补偿装置的选择、成套装置的电气接线和配套设备、节能及经济效益分析、防止谐振和电机自激磁等问题加以研讨。     

坐标组合法对直埋电缆与土壤界面温度场的数值计算

高压电力输送在城市一般都采用地下电缆的形式。为确保电缆能够安全 ,正常的工作 ,采用精确的方法预计地下电缆的载流量与热特性是很有意义的。本文采用有限差分法 ,用坐标组合的方式对土壤区域和电缆区域分别进行计算 ,最终可以确定任意敷设方式下电缆允许的载流量。计算与实验结果进行比较 ,认为完全可以满足实际需要。     

基于Chirp-Fourier 变换的LFM信号的参数估计

本文从匹配Fourier变换的角度给出了chirp-Fourier变换的定义、意义和离散实现。分析表明，LFM信号的Chirp-Fourier变换的峰值对应的坐标即为其初始频率和调频斜率，所以应用Chip-Fourier变换可以估计LFM信号的参数。仿真试验表明，应用Chirp-Fourier变换不但可以有效地估计LFM信号的参数，而且有很好的抗噪声干扰能力。     

MC68HC11Kx系列单片机存贮器扩展

文中介绍MC68HC11Kx系列单片机存贮器扩展技术，并给出应用实例，对工程设计具有参考意义。     

大型电力系统非全相振荡时任意时刻电气量的快速计算

基于双口网络理论，对继电保护整定计算过程中大型电力系统非全相振荡时任意时刻正序网断相口开路电压的计算方法进行了深入研究，提出了一种能自动适应电力系统网络操作，可快速计算大型电力系统非全相振荡时任意时刻正序网断相口开路电压的新方法，并应用这一方法解决了继电保护整定计算中快速计算大型电力系统非全相振荡时任意时刻电气量的问题。该方法在保留现有方法优点的基础上，可显著提高计及网络操作时大型电力系统非全相振荡时任意时刻电气量的计算速度和计算效率，可满足大型电力系统继电保护在线整定计算的需要。     

电容型设备介损检测仪的设计

介绍了一种基于基波相位分离法的电气设备绝缘介质损耗数字化检测方法,根据其原理设计了以DS80C320型单片机构成的绝缘介损检测仪,详细描述了其硬件组成和软件设计,给出了该仪器装置测量的试验结果。     

基于LabVIEW虚拟信号频谱分析仪的设计与实现

介绍了信号频谱分析仪的硬件构成和软件设计思想及程序流程,分析了设计和实现过程中需要注意的问题.     

Delay-dependent robust stabilization of uncertain systems withmultiple state delays

This paper deals with the problem of robust stabilization for uncertain systems with multiple state delays. The parameter uncertainties are time-varying and unknown but are norm-bounded, and the delays are time-varying. A new method for achieving robust stabilization is presented for a class of uncertain time-delay systems via linear memoryless state feedback control. The results depend on the size of the delays and are given in terms of several linear matrix inequalities     

Fast Collision Detection Algorithms with Applications to Particle Flow

In this paper, we present efficient algorithms for collision detection of arbitrarily shaped rigid moving objects in a variety of interactive as well as non-interactive environments. The algorithms primarily consist of two stages. The first stage involves finding candidate objects for possible collisions. The second stage involves detecting exact (within a prespecified tolerance) collision between these candidates. The primary data structure used in the algorithms is an octree. In the first stage, we build an octree for the enclosure containing the objects, which is used to detect possible collisions. Assuming spatial/temporal coherence i.e., that the particles move slowly or that the time sampling is fast enough, the average time complexity of this stage can be shown to be O(n) (excluding the time complexity for a one time octree construction), where n is the number of particles. In the second stage, we build a surface-octree for each object. If the objects are convex and assuming coherence, the expected time complexity to detect precise (within a prespecified tolerance) collision for each pair is a constant (excluding the time complexity for a one time surface-octree construction). Therefore, the overall expected time complexity for convex object collision detection is linear with respect to n. For the concave objects, complexity analysis is nontrivial to perform and instead we provide a very practical (almost linear time) algorithm. We apply our algorithms to particle flow simulations by simulating flow density conditions often arising in granular flows.     

Output feedback decentralized stabilization: ILMI approach

In this paper, the static output feedback decentralized stabilization problem is addressed using a linear matrix inequality approach. A necessary and sufficient condition for static output feedback decentralized stabilizability is derived for linear time-invariant large-scale systems. It is proven that the existence of a stabilizing decentralized gain is equivalent to that of the solution of a quadratic matrix inequality. The extension of the result to control is studied. An iterative LMI algorithm based on the linear matrix inequality technique is proposed to obtain the decentralized feedback gain. Examples show the effectiveness of the algorithm.