8098单片机开关磁阻电动机调速系统

开关磁阻电动机调速系统是２０世纪８０年代中期兴起的一种新型调速系统，本文介绍了开关磁阻电动机调速系统的基本原理，并设计了一种用８０９８单片机实现的开关磁阻电动机调速系统，实验证明该系统运行可靠。     

用变节径法研究圆弧齿同步带不完全啮合区传动状态

根据圆弧齿同步带的传动特性，应用变节径法，建立了圆弧齿同步带与带轮在不完全啮合关系模型。在此基础上，分析了圆弧齿同步带与带轮的节距差、带轮齿数对啮合动干涉的影响；得出圆弧齿同步带与带轮零节距差传动有干涉，带轮具有适量的正节距差可减少啮合传动干涉，提高带的寿命。     

圆弧齿同步齿形带传动的应用研究

分析了圆弧齿同步齿形带传动的形式及原因，介绍了带轮滚刀齿廓的优化设计方法和结果、带轮材料及热处理方式的选择，以及对原带轮结构的改进等。     

丙二醇甲醚醋酸酯合成研究

研究了以浓硫酸为催化剂，丙二醇甲醚和醋酸酯化合成丙二醇甲醚醋酸酯的过程，考察了醚和酸比例、催化剂用量等因素对反应的影响，并选择甲苯为水萃取剂，当丙二醇甲醚与醋酸和甲苯配比分别为１．０：１．１和１．０：０．６（ｍｏｌ：ｍｏｌ），催化剂浓硫酸用量ω＝０．００５￣０．０１时，丙二醇甲醚醋酸酯的收率大于９６％，通过对该反应的动力学研究得到了反应的活化能及反应速率常数。     

工业打印机的硬件电路设计及分析

介绍和分析计算机、单片机为核心，感应子式步进电机控制打印针头打印钢号的硬件电路的工作原理、设计方案。通过串行口将计算机产生的连续纲号（即产品的列序号）传输给单片机，单片机收到信息后控制打印针头，实现打印过程。     

同步脉搏心电信号的混沌特性分析

对同步脉搏信号和心电信号进行处理,获取脉搏信号和心电信号的间期序列PR及RR,采用替代数据法和Lyapunov指数判断HRV和PRV的混沌特性.结果表明,具有混沌特性的同步脉搏信号和心电信号的零假设检验显著性水平大于1.96,Lyapunov指数大于0,混沌特性一致.在心电信号不可得或不方便得到时,可利用PR代替RR对...     

FBFN-based adaptive repetitive control of nonlinearly parameterized systems

An adaptive repetitive control scheme is presented for a class of nonlinearly parameterized systems based on the fuzzy basis function network （FBFN）. The parameters of the fuzzy rules are tuned with adaptive schemes. To attenuate chattering effectively, the discontinuous control term is approximated by an adaptive PI control structure. The bound of the discontinuous control term is assumed to be unknown and estimated by an adaptive mechanism. Based on the Lyapunov stability theory, an adaptive repetitive control law is proposed to guarantee the closed-loop stability and the tracking performance. By means of FBFNs, which avoid the nonlinear parameterization from entering into the adaptive repetitive control, the controller singularity problem is solved. The proposed approach does not require an exact structure of the system dynamics, and the proposed controller is utilized to control a model of permanent-magnet linear synchronous motor subject to significant disturbances and parameter uncertainties. The simulation results demonstrate the effectiveness of the proposed method.     

中山市灰霾天气与相关污染物的关系分析

根据中山市四个空气质量自动监测站和中山市气象局的监测数据,统计2008年和2009年全市PM10、NO2、O3的浓度值与灰霾天气出现天数。分析了它们的月变化趋势和PM10、NO2、O3与灰霾天气的相关关系。结果表明PM10、NO2、O3和灰霾天气有明显的季节变化规律,PM10、NO2与灰霾天气有较好的相关性,其中PM10与灰霾天气的相关水平达到0.9以上;O3与灰霾天气也有一定的关系,但相关水平较低。     

基于前馈及反馈补偿的高性能直线伺服系统

数控机床用直线电动机在工作过程中,推力波动、负载扰动和非线性摩擦等各种扰动因素降低了直线伺服的性能。为抑制扰动满足数控机床直线伺服系统速度跟踪性能的要求,在分析永磁直线同步电动机数学模型和各种扰动因素的基础上,引入具有动态递归特性的Elman神经网络,设计出具有前馈及反馈综合补偿效果的复合控制器,不仅可以对各种扰动进行反馈补偿,而且对速度给定信号进行预测前馈补偿控制,提高了直线伺服系统的跟踪精度和响应速度,仿真结果验证了Elman神经网络的动态性能及综合补偿的优点,表明了复合控制方案的有效性和可行性。

Abstract：

Disturbance variations,such as force ripple,load disturbance and nonlinear friction,directly impose on the motor shaft,leading to significant effect on the computer numerical control （CNC） machine tool servo system performance.In order to satisfy the requirements for speed command tracking performance and eliminate the influence of disturbance,on the bases of the analyzing the mathematics model of permanent magnet linear synchronous motor （PMLSM） and disturbance variation,Elman dynamic recurrent Neural Network was introduced and compound controller with feedforward and feedback comprehensive compensation was proposed.The disturbances were compensated by feedback component and reference speed input signal was preview controlled by feedforward component.The tracking performance and respect speed of linear server system were improved.The advantages of the comprehensive compensation and dynamic of Elman NN were proved.The simulation results show that this compound control scheme is feasible and effective.     

Design optimization of a slotless PM brushless motor with helical edge wound laminations for rim driven thrusters

This paper discusses the analysis and design of a very thin slotless permanent magnet (PM) brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a "Slinky") and then fitted over the windings that are preformed on the outside surface of a non-conducting former. Analytical and finite element analysis (FEA) are used to determine the constrained optimum dimensions of a motor used to drive a rim driven thruster in which the motor rotor is fitted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. The paper describes the fabrication of a demonstrator motor and presents experimental results to validate the theoretical calculations. Experimental motor performance results are also reported and compared with those of a slotted motor that fits within the same active radial dimensions as the slotless motor. The slotless motor, which has longer active length and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and more expensive (prototype cost) than the slotted machine.