基于AJAX技术创建的异步方法应用研究

遵循AJAX技术的基本原理,创建了一个简单的异步引用方法,并给出登录实例来说明如何实现该方法的引用,减少代码冗余。主要阐述了通过创建方法,并引用方法到不同Web应用程序中,实现了代码的优化。     

挖沙船的变频节能改造分析

挖沙船上主电机在采用变频调速以前,多用星三角起动或自耦减压起动方式。这种启动方式起动电流较大,导致所选用的柴油发电机的容量过大。采用变频调速以后,可以减小电动机的起动电流,降低柴油发电机的容量,减少前期投资,给企业带来可观的经济效益。     

Asynchronous fault detection filter design approach for discrete‐time switched linear systems

This paper is concerned with the problem of the fault detection filter design for discrete‐time switched linear systems with average dwell‐time. The designed fault detection filters are also switched systems, which are assumed to be asynchronously switched with the original switched systems. Improved results on the weighted l₂ performance and the H _? performance are first given, and the multiple Lyaounov‐like functions during matched period and unmatched period for the running time of one subsystem are used. By the aid of multiple Lyapunov‐like functions combined with Projection Lemma, the FD filters are designed such that the augmented systems under asynchronous switching are exponentially stable, and the residual signal generated by the filters achieves the weighted l₂‐gain for disturbances and guarantees the H _? performance for faults. Sufficient conditions are formulated by linear matrix inequalities, and the filter gains are characterized in terms of the solution of a convex optimization problem. Finally, examples are provided to demonstrate the effectiveness of the proposed design method. Copyright © 2012 John Wiley & Sons, Ltd.     

基于Pro/TOOLKIT异步模式特征识别方法

对Pro／Engineer（Pro／E）二次开发工具Pro／TOOLKIT（PTC公司为Pro／E软件提供的二次开发工具包）的异步模式进行了研究，充分利用参数化技术，开发了实体模型的特征识别系统。系统可以控制Pro／E的自动启动及关闭，使其在后台运行。通过模型的调用实现实体特征的快速识别提取，为模具估价系统的智能化设计做好了准备。     

洛河电厂6kV厂用电源双向快速切换

由于快切装置生产厂家只能提供一种逻辑,无法满足"厂网分开,竞价上网"后降低成本的要求,为此对厂家装置进行改进。针对以上要求,提出增加一套快切装置(称为反切柜)用于备用段自投。用这套快切装置进行两台机组与备用段电源开关之间的切换,通过设定的转换开关进行选择,并增加相应逻辑。这样避免了使用购网电量。同时实现无论哪台机跳闸备用电源均能投入运行。     

发电机失磁故障典型判据分析

介绍发电机失磁对电力系统及发电机本身造成的危害,阐述典型判据分析发电机失磁故障的原因及采取的方案措施．     

基于覆盖技术的异步时序电路设计

该文根据动态卡诺图的原理,提出了异步时序电路设计的新方法-基于覆盖技术的异步时序电路设计法。该方法采用α,β覆盖,不仅可通过卡诺图直接得出整个电路的次态方程,而且与传统的异步时序电路设计方法相比,成本更低、功耗更低、延时更少。     

Experimental Study on the Expansion Uniformity of Armature

A measurement system has been developed based on high-precision printed probes in printed circuit board (PCB) and steep rising-time probe adapters,which can be applied to study the expansion uniformity of armature in a helical magnetic flux compression generator (HFCG).The influences of wall thickness and initiation position on the expansion uniformity of armature in HFCG were experimentally investigated.The results show that the armature with thinner wall thickness will easily rupture due to the high pressure of detonation products inside,the armature with larger wall thickness will easily crack due to the tensile stress on the outer surface of the wall,the influence of the end effect on the expansion uniformity can be ignored if the distance between the first group of probe and the initiation point is more than 3 times the armature diameter.     

压电式胎压报警器供电装置的发电特性

提出利用压电发电装置替代电池为胎压报警器提供实时电能。根据胎压报警器结构特点,提出将压电发电装置安装在车轮轮毂上,利用车轮转动中的振动来发电的方案。通过试验的方法研究了压电振子在轮毂上不同安装方式下的发电特性。试验结果表明,在既垂直于轮毂又垂直于车轮滚动方向的安装方式下,压电振子可以有效克服离心力的影响并吸收来自车轮所在平面多个方向的振动,压电发电装置发电效果较佳,适合为胎压报警器供电。利用4片45mm×15mm×0.2mm的悬臂梁型压电振子并联为胎压报警器供电,其产生的能量能够满足胎压报警器的工作要求。     

冗余CAN总线在励磁装置中的应用

针对国内励磁控制系统普遍存在的故障易发率高、维护困难等问题,通过采用冗余策略,引入现场总线概念,采用带有两个CAN控制器的微处理器dsPIC 30F6014作为控制核心,构建了一种基于CAN总线的网络式新型励磁控制系统,它实现了冗余设计.文中介绍了励磁系统的构成、CAN总线的特点、通信方案、软硬件设计方法及运用指数分布函数对此冗余系统进行可靠性分析.所设计的系统具有较强的实时性,大大降低了部件之间相互影响的程度,提高了系统的可靠性.