梭形线圈制动绕线架的改进

简要介绍了一种适用于中小型高压电机定子梭形线圈绕制的制动绕线架,它在生产过程中起了减少铜扁线绝缘损伤的作用,并能提高生产效率.     

信息产业--推进国民经济可持续发展的重要增长点

信息产业是当今世界最活跃、最有发展前途的产业之一,在我国经济发展的舞台上,信息产业已成为拉动国民经济信息化和建立可持续发展经济的重要新增点.     

基于小波变换的多尺度图像匹配算法

文中针对基于梯度算子的图像匹配方法通常存在的问题———收敛速度较慢、迭代易落入局部最优点,提出了一种基于小波变换的多尺度图像匹配算法。这一算法利用小波的良好的多尺度特征,先对低分辨率的子图像做匹配,将得到的结果作为初始值用于高分辨率图像的匹配运算,匹配运算都在位移矢量场上进行。实验表明该方法可节省计算时间,且减小迭代落入局部最优点的概率,算法鲁棒性得以提高。     

V5.x协议测试系统

首先概述了 V5 .x接口的功能及 V5 .x协议的结构 ,在此基础上 ,详细阐述了在 PC机上实现 V5 TS (V5 .x协议测试系统 )的测试原理及方法。最后 ,通过一个测试举例 ,描述协议消息的传输过程。     

时隙结构规划同步自组织网络

针对现代战争对战术C3I系统提出的高要求,作为支持战术武器系统、指挥控制系统的战术通信系统,要求其具有良好的抗毁性和机动性,以及能够传输大量信息的能力.本文提出了基于传统时隙结构的同步自组织网络,在强干扰和集群移动用户的环境下,该网络结构具有较强的抗干扰能力和灵活的网络重构能力.     

LMS算法收敛步长的精确求解

本文提出了用步长阀值上下限的算术平均值去计算收敛步长的新方法,通过LMS算法失调量的精确分析,寻出了计算步长的公式.计算机模拟结果证实了本文方法及其步长计算公式的准确性.     

Robust Constrained Model Predictive Control Based on Parameter-Dependent Lyapunov Functions

The problem of robust constrained model predictive control (MPC) of systems with polytopic uncertainties is considered in this paper. New sufficient conditions for the existence of parameter-dependent Lyapunov functions are proposed in terms of linear matrix inequalities (LMIs), which will reduce the conservativeness resulting from using a single Lyapunov function. At each sampling instant, the corresponding parameter-dependent Lyapunov function is an upper bound for a worst-case objective function, which can be minimized using the LMI convex optimization approach. Based on the solution of optimization at each sampling instant, the corresponding state feedback controller is designed, which can guarantee that the resulting closed-loop system is robustly asymptotically stable. In addition, the feedback controller will meet the specifications for systems with input or output constraints, for all admissible time-varying parameter uncertainties. Numerical examples are presented to demonstrate the effectiveness of the proposed techniques.     

激光冲击调整5B05铝合金残余应力状态的模拟仿真

开展了激光冲击波调整表面残余应力(主应力)状态的模拟仿真与实验研究。以ABAQUS为平台,建立了激光冲击5B05铝合金的有限元分析模型,研究了激光冲击参数对5B05铝合金激光冲击处理残余应力场的影响。模拟结果表明:随着冲击次数的增加,表层残余压应力逐渐增大,当冲击次数为3次时,增加并不明显,说明表面峰值残余压应力趋于饱和;在冲击压力一定的条件下,表面残余应力随光斑直径增大而增大,半径增加至一定程度后表面峰值残余压应力增幅会达到最小,基本保持不变。通过实验与模拟结果对比发现,尽管实验值与模拟结果存在一定的误差,但总体趋势一致,说明建立有限元模拟模型结构有效可行。     

Structural and optical properties of (Al,K)-co-doped ZnO thin films deposited by a sol–gel technique

Thin films of Al-doped ZnO (AZO) and (Al, K)-co-doped ZnO (AKZO) were synthesized by sol–gel spin coating and their structural and optical properties were investigated. All the films had a preferential orientation in which the c-axis was perpendicular to the substrate. The optical bandgap increased after Al doping, but decreased after K doping at a given Al doping concentration. UV emission and a broad visible emission band were observed in photoluminescence (PL) spectra. The intensity of both emission bands decreased after Al and K co-doping. PL excitation (PLE) spectra of the blue emission band indicate that the initial state is possibly the same for all the samples and a similar case occurs for the orange–red emission band. The green emission can be attributed to electronic transitions involving oxygen vacancies. A possible process for the orange–red emission of the thin films is radiative recombination of an electron trapped in a zinc interstitial defect with a hole deeply trapped in interstitial oxygen.     

微机械电子学系统

本文简要地评述了微机构、微传感器、微执行器的发展,提出了微机械电子学系统的概念,指出了微机械电子学系统的发展前景。