A novel robust adaptive control algorithm for AC drives

In this paper a robust adaptive control algorithm for AC machine is presented. The main feature of this algorithm is that minimum synthesis is required to implement the strategy—hence the appellation minimum controller synthesis (MCS). Specifically, no plant model is required (apart from a knowledge of the state dimension) and no controller gains have to be calculated. The MCS algorithm appeared to be robust in the face of totally unknown plant dynamics, external disturbances and parameter variations with the plant. Finally a new approach has been successfully implemented on field-oriented controlled drive. Discussion on theoretical aspects, such as, selection of a reference model, stability analysis, gain adaptive and steady state error are included. Results are also presented.     

Modulation of viewing angle on an LCD surface through backlight optics

Abstract— A backlight unit (BLU) that varies the viewing angle from the top to the bottom surface of a transmissive LCD screen has been developed through the design and fabrication of microstructures on a light‐guide plate (LGP). An array of taper prisms has been designed and fabricated on the back surface of the LGP, which resulted in the variation of 29° in the angular distribution of the luminance of the backlight from the top sector to the bottom sector of its surface. This characteristic is employed to modulate the viewing angle of the LCD from the top of the screen to the bottom of the screen for special applications.     

Visual display characterization using temporally modulated patterns

Abstract— A novel method to characterize CRT displays through visual assessment and a pair of visual experiments that were conducted to validate this method will be discussed. The temporal integration method discussed in this paper has many advantages over previously described methods, which have employed spatially modulated patterns to characterize displays. Included among the advantages are improvements in usability and enhanced robustness to single errors in human judgment. The observer study demonstrates that the method provides a robust estimate of CRT display gamma for both novice and experienced observers. This method may be applied to provide improved electronic‐display matching in e‐commerce applications, including online catalogs and online photofinishing.     

Development of the PenTile Matrix™ color AMLCD subpixel architecture and rendering algorithms

Abstract— Color subpixel rendering is enhanced by co‐optimizing the color subpixel architecture and algorithms with respect to human vision. This has resulted in the PenTile? display technology, which provides double the information content per subpixel when compared to a conventional RGB Stripe display. Output performance results from mathematical modeling, software simulations, and prototype AMLCDs displays demonstrate significant quality improvements to both text and full‐color images in comparison to images from RGB Stripe displays that have the same number of subpixels and column drivers.     

VXI总线控制方式及其性能分析

VXIbus规范对总线控制器的实现给予了很大的灵活性，文章详细介绍了当前流行的几种VXIbus控制方式，给出了一组针对不同配置的性能测试参数，并作了对比分析，最后对系统方案的选择提出了几点建议。     

穴盘播种器双轴协调控制系统的研究

摆臂和穴盘双轴协调控制是穴盘播种器的自动控制系统的关键。根据播种器的工作特性，设计了双轴系统合理的控制方案，针对摆臂的动作要求设计了严格的摆臂行程控制策略。运用实时性软件设计思想编写了系统控制程序，提高了控制系统的实时性。     

基于PC/104的摆式列车控制器设计

介绍了摆式列车倾摆控制系统的功能和原理。设计了一种基于PC／104工控机的控制器，实现了对摆式列车倾摆控制系统的控制及信息交换。系统调试结果表明，控制器达到了系统性能要求。为摆式列车的试验及运行提供了一种有效的设备。     

一类分布参数系统的反馈能稳性

研究了一类分布参数系统在有限维输出反馈下的指数能稳性,用构造有限维观测输出反馈控制器的方法,得到这一类系统反馈指数能稳的充分条件.     

USB2.0 Hub 事务转换器的工作机理

USB通用串行总线是新一代标准接口总线，与USB1．0版本不同，USB2．0不仅支持低速（1.5Mbps)和全速（12Mbps)外部设备，还支持高速（480Mbps)外部设备。为了将全／低速设备对高速设备可用带宽的影响减到最小，USB2．0提供了一种机制，该机制支持在Hub连接的是全／低速设备的情况下，主控制器与Hub之间以高速传输所有设备的数据。     

多相空间矢量脉宽调制技术研究

近年来，三臂三相空间矢量脉宽调制(SVPWM)逆变器在三相交流电机变频调速中得到了广泛的应用。但三臂三相SVPWM难于胜任大转速-力矩调节范围、大功率、高可靠性的要求。本文对三相SVPWM技术进行推广，提出并分析一种多臂多相的空间矢量脉宽调制和极相调制技术。特别地．将9相SVPWM技术应用到九绕组感应电机中，并将9相SVPWM技术与9相SPWM进行比较。