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.     

甚低码率视频编码

随着新的电信服务与应用的出现，对甚低码率（６４ｋｂ／ｓ以下）视频编码的需求大大增加．文中从波形编码和模型编码两方面介绍了甚低码率视频编码技术的进展，探讨了存在的问题．     

具有完整性的状态反馈H2最优控制器设计

基于互质分解的状态空间描述方法,给出了状态反馈下对执行器失效具有完整性的 H2最优控制器的一种新的参数化形式,将具有完整性H2最优控制器设计转化为设计一严格 正则的稳定控制器同时镇定对应于k个故障状态的k个辅助对象.     

混流式水轮机转轮内部三维紊流的数值分析

本文基于Ｎ－Ｓ方程和标准的ｋ－ε紊流模型，采用贴体座标和交错网格系统，用ＳＩＭ－ＰＬＥＣ算法对一比转速ｎＳ＝２４０（ｍ，ｍ３／ｓ，ｒ／ｍｉｎ）的混流式水轮机模型转轮内部的流动进行数值模拟，提出了三个典型工况时三维紊流数值计算结果，初步分析了转轮的汽蚀和能量特性，为改进设计提供了一些有益的参考资料。     

糠醛添加DMF精制润滑油

报导了DMF作为糠醛的添加剂,对润滑油糠醛精制萃取过程进行了一次平衡试验,试验结果表明,由于DMF的加入,缩短了两相达到平衡的时间,提高了精制油收率,并且精制油质量亦有所改善。     

关于一个Diophantus不等式的整数解个数

命t(m,q;r)=(m+r+g)~α-(m-r+q)~α—(m+r-q)~α+(m-r-q)~α,其中α(α-1)(α-2)(α-3)≠0。本文的目的是给出Diophantus不等式,满足条件的整数解数的较精确上界估计。其中。