多变量系统反馈补偿解耦设计

针对于多变量控制系统解耦补偿阵选取的困难，提出了一种基于反馈补偿的解耦补偿阵频域设计方法，其特点是原理较为简单。文章给出了一个２×２阶被控对象的实例，得到了较满意的仿真结果。     

一种多变量汽门控制器的设计

提出了一种新的多变量反馈汽门控制器的设计方法，该控制器与平衡点的位置及网络的参数 无关。仿真结果表明：该汽门控制器对不同的故障具有适应性，且能有效地提高系统的暂态 稳定极限。     

A memristive dual-slope A/D converter

As an emerging device, memristor has several excellent properties like changeable memristance, nonvolatility, and nanoscale. Based on complementary metal-oxide-semiconductor (CMOS) dual-slope analog-to-digital (A/D) converter, this paper proposes a memristive dual-slope A/D converter. Owing to the usage of memristor, the proposed memristive A/D converter not only has more compact circuit structure and simpler control timing than the CMOS one but also has advantages over the existing memristive conversion circuits in circuit design and application. For the memristive A/D converter, a conversion process consists of two count procedures. By means of controlling the memristance change in the two count procedures, the A/D converter converts an analog signal to the corresponding digital count value. Meanwhile, the conversion result is inferred according to the circuit structure of the A/D converter. Then, combining the conversion process and PSPICE simulation, this paper analyzes the anti-interference performance of the A/D converter. Further, the robustness of the A/D converter is presented, applying the similar analysis methods. The analysis results demonstrate that the proposed A/D converter has good anti-interference and robustness performances.     

250A直流固体继电器的设计

文章论述了250A直流固体继电器的电原理设计和主要结构设计,重点对大功率输出器件的设计和MOSFET并联结构进行了分析,给出了产品的设计方案,阐明了设计思路.     

A STRATEGY TO ISOLATE A SWITCHING DEVICE FAULT IN A CURRENT REGULATED MOTOR DRIVE

ABSTRACT

In this paper a new, improved induction motor control topology is proposed which allows for continuous, disturbance-free operation of the drive with a failed short-circuited switch in one leg of the inverter. The analysis of this control strategy and the computer simulation are explored. The experimental results from hardware are attached to verify the simulation results. A complete control strategy combined with short-circuit fault and open-circuit fault is also included.     

A VISION OF FRAM AS A FUSION MEMORY

ABSTRACT

The purpose of this paper is to attempt to find a plausible solution for a high density FRAM (Ferroelectric Random Access Memory). To complete this, firstly, we give a very brief but an important review of how FRAM technologies have been evolved during the past many years. Secondly, not only are a few examples demonstrated in terms of how a FRAM-embedded system is advantageous when adopted in a system but it is also put forward how FRAM can play an essential role in a fusion memory. Finally, several process technologies for integrating a reliable high-density FRAM are mentioned, accordingly resulting in very reliable cell-charge populations after full integration, along with wafer-level reliabilities.     

三相辐射配电网状态估计方法

提出了一种基于牛顿法的三相配网状态估计算法。该算法充分利用辐射配网的特点,计及三相不平衡,采用分解形式的雅可比矩阵,每步迭代时不需要重新分解。理论分析和实际算例表明,该算法收敛可靠,运算速度快,内存占用少,量测适应性好。     

同步滤波器

本文所讨论的同步滤波器,是一种高Q值的脉冲控制式带通滤波器。其中心频率w_0=(2π/N)f_c,可以通过改变电子开关的驱动频率f_c来连续改变。这种滤波器的基本思路是将同步信号变成直流信号,将非同步信号或噪声信号变成频率更高的信号,由低通滤波器将同步信号完全响应而把非同步信号和噪声衰减到原幅值的10~(-x),x可任取1、2、3、4或更大。     

大型电站烟道关闭挡板的性能测试研究

大型电站的烟道关闭挡板是烟风管道系统的主要配套设备，在引进制造技术的基础上，对其性能测试进行了研究。通过对国产化产品的各项动、静态参数测试和电厂热态测试的研究，对该产品提出了性能指标和数据，完善了引进技术的消化吸收工作，这对提高国产化产品质量、国产化率、节约资金等方面有重要作用。     

关于体上的自共轭矩阵的注记

在文[1]、[2]的基础上,本注记证明了一般体上的自共轭矩阵的收缩定理,特征数≠2的体上的自共轭矩阵的GH对角化定理以及体上某些类型矩阵分解为自共轭矩阵乘积的相应结果,并得到了四元数体上的可中心化矩阵与可交换化矩阵的一种关系。     

新型盐酸缓蚀剂的研究

合成了一种新型盐酸缓冲剂—— β—二乙胺基丙酰苯 (简称 DPB) ,并用失重法、极化曲线法研究了其缓蚀性能。结果表明 ,DPB在盐酸中对碳钢有良好的缓蚀作用 ,是一种混合控制型缓蚀剂     

一种交流采样的补偿算法

提出了一种应用于微机交流采样中功率、电压、电流有效值测量的采样补偿方法,该方法精度高,响应速度快。并在8096开发系统上进行了该算法的仿真计算,结果表明,该算法具有很高的精度。     

THEORY OF A SYNCHRONOUS MACHINE WITH A SELF-LEVITATED ROTOR

ABSTRACT

The properties of an ironless rotor synchronous machine (SM) with null-flux windings on the stator and radial displacement of the rotor are considered. The system of the SM equations are derived. These equations are based on an analytic representation of a three-dimensional excitation field and on considering the SM as a dynamic system with three generalized coordinates, two of which are the coordinates of the Center of rotor mass and one is the angle coordinate which characterizes the rotation of the rotor on its own axis.

On the basis of the solution of the equations we obtain the relations for all the basic quantities: radial and centering forces, radial suspension stiffness and parameters of the null-flux circuit. They characterize all the properties of the SM in the state when the rotating rotor undergoes a radial displacement.     

斩波式可变电阻器及其应用

斩波式可变电阻器是应用现代脉宽调制（ＰＷＭ）技术对固定电阻进行斩波控制,从而实现电阻无级可调的新型变阻器。与传统的接触工变阻器相比,它不权具有体积小、造价低、维护使用方便等优点,而且具有调节精度高,可以方便地实现恒电流自动控制的特点,是一种值得推广的高科技电子产品。本文详细地论述了这种变阻器的原理、特性,并给出了一些具体应用的分析计算,对它的推广使用具有积极的指导作用。     

A serial charge redistribution logarithmic A/D converter

The present paper describes the design and prototype construction of a serial charge redistribution logarithmic A/D converter (LADC). the LADC uses only two capacitors and has an eight-bit digital word. It directly converts the input to logarithmic code and is suitable for use with digital systems implementing the sign-log number system. the conversion is completed in 128 steps (clock cycles). the input dynamic range is four decades and the relative error is 3.7 per cent. A capacitor ratio accuracy of 0.4 per cent is required to keep conversion errors within 1 LSB.     

气脉冲发生器中火焰传播与压力变化的研究

燃烧气脉冲发生器用于电厂锅炉除灰，其工作原理是预混可燃气体在右端部分开口在内部有障碍物的容器中快速燃烧，以形成一定的压力脉冲，并产生作用于积灰表面的射流和冲击波，火焰在端流扰动装置的作用下不断加速，容器中的压力不断上升，火焰传播愈快，压力波形愈陡，压力锋值愈高，针对这些现象，该文进行了实验和理论研究。主要研究了乙炔，水煤气，液化石油气和甲烷4种燃料，在不同燃料浓度，不同阻塞比时对火焰传播和压力上升的影响，计算和实验结果对实验应用有指导作用。     

一种交流采样的补偿算法

本文提出了一种应用于微机交流采样中功率、电压、电流有效值测量的采样补偿方法，该方法精度高，响应速度快。并在８０％ 开发系统上进行了该算法的仿真计算，结果表明当电力系统在正常工作范围内变动时，该算法具有很高的精度。     

ANALYSIS OF A GRID DIPOLE ARRAY PLACED INSIDE A WAVEGUIDE CAVITY WITH A RECTANGULAR COUPLING APERTURE

The circuit and coupling properties of a dipole grid array placed inside a rectangular cross-section waveguide are analysed when also a rectangular aperture is used to couple the resonator energy into a semi-infinite waveguide. A Green function approach is employed to determine the current distribution on the dipole elements by solving an integral equation and taking into account the boundary conditions on the rectangular cavity walls. Both mutual and self-impedance terms are calculated for the dipole grid array, and the effects of the rectangular coupling aperture are also examined. © 1997 by John Wiley & Sons, Ltd.