Controller synthesis with guaranteed closed-loop phase constraints

In this paper, we present an analysis and synthesis approach for guaranteeing that the phase of a single-input, single-output closed-loop transfer function is contained in the interval [−α,α] for a given α>0 at all frequencies. Specifically, we first derive a sufficient condition involving a frequency domain inequality for guaranteeing a given phase constraint. Next, we use the Kalman–Yakubovich–Popov theorem to derive an equivalent time domain condition. In the case where , we show that frequency and time domain sufficient conditions specialize to the positivity theorem. Furthermore, using linear matrix inequalities, we develop a controller synthesis approach for guaranteeing a phase constraint on the closed-loop transfer function. Finally, we extend this synthesis approach to address mixed gain and phase constraints on the closed-loop transfer function.     

基于单片机的温室自动控制系统

介绍一种基于单片机的温室温度自动控制系统。热敏电阻采集温室内的温度,单片机控制温度在液晶屏上实时显示,利用上位机进行实时监控,通过串行通信将采集到的数据送至上位机,应用系统自带的超级终端软件实现温室温度在上位机中的实时显示。     

汽车行驶记录系统中AT89C51ED2的设计与实现

本文介绍了AT89C51ED2在汽车行驶记录仪中的实现.该记录仪采用大容量闪速存储器FM1808作为存储栽体,利用定时器中断方式来实现秒间隔的数据采集与存储,利用串行口中断方式实现与微机的数据通信,通过USB HOST和IC卡实现对车辆记录数据的快速下载和出行任务的灵活设置.     

基于STC89C51的流体阀门电动执行器控制系统的设计

介绍了一种基于STC89C51单片机控制的流体阀门电动执行器的结构及工作原理,重点阐述了该电动执行器控制系统的组成及软、硬件设计方案。该电动执行器控制系统以STC89C51单片机为核心,利用环形分配器及功率放大电路控制步进电动机的转速、旋转角度等,进而控制阀门开度,并利用流量和压力传感器采集流体参数信号,并将该信号经AD转换后发送给STC89C51单片机,形成闭环控制,同时具有CAN通信和人机交互功能。     

自动装填系统故障检测适配器设计

针对装甲车辆自动装填系统的电气故障检测需求,分析了装甲车辆自动装填系统的基本工作原理和电信号特点,设计了以单片机AT89C52为核心的装甲车辆自动装填系统电气故障检测适配器;该设计具有多CAN通信通道、开关量和模拟量采集、开关量输出功能,构建了适配器与控制终端PC机组成的上下位机测控系统,可应用于我多型号坦克、步兵战车自动装填系统的功能测试和电气故障检测,具有较好的通用性、可靠性和较强抗电磁干扰性能,实际应用效果良好。     

Embedding HMMs-based models in a Euclidean space: the topological hidden Markov models

Current extensions of hidden Markov models such as structural, hierarchical, coupled, and others have the power to classify complex and highly organized patterns. However, one of their major limitations is the inability to cope with topology: When applied to a visible observation (VO) sequence, the traditional HMM-based techniques have difficulty predicting the n-dimensional shape formed by the symbols of the VO sequence. To fulfill this need, we propose a novel paradigm named “topological hidden Markov models” (THMMs) that classifies VO sequences by embedding the nodes of an HMM state transition graph in a Euclidean space. This is achieved by modeling the noise embedded in the shape generated by the VO sequence. We cover the first and second level topological HMMs. We describe five basic problems that are assigned to a second level topological hidden Markov model: (1) sequence probability evaluation, (2) statistical decoding, (3) structural decoding, (4) topological decoding, and (5) learning. To show the significance of this research, we have applied the concept of THMMs to: (i) predict the ASCII class assigned to a handwritten numeral, and (ii) map protein primary structures to their 3D folds. The results show that the second level THMMs outperform the SHMMs and the multi-class SVM classifiers significantly.     

基于GPRS的矿井远程数据传输系统的设计

提出了一种基于GPRS无线数据传输模块SARO3150P GPRS DTU和AT89S51单片机的矿井远程数据传输系统的设计方案,给出了GPRS数据传输的工作原理,详细介绍了系统硬件及软件设计。实际应用表明,该系统具有数据传送可靠、营运费用低等优点,具有一定的实用性。     

霍尔传感器在直流电机转速测量中的应用研究

采用霍尔传感器和AT89S52单片机控制步进直流电机转速,介绍了测速原理与软硬件设计方法。通过1602LCD显示电机转速值,根据需要可调整控制电机的转速。测试结果表明:该转速测量系统满足设计要求,具有硬件结构简单、性价比较高、易于调节电机转速及系统性能稳定等优点。     

电阻炉数字控制电路的设计与实现

温度测量与控制在工业、农业、国防等行业有着广泛的应用.由于利用单片机技术的温度测控可靠性高、价格低廉而被广泛采用.本文对电阻炉的数字控制电路进行了分析和设计.     

基于TC35I的汽车空调温控系统的设计

应用TC35I模块和DS18B30单总线数字温度传感器模块,利用STC89C52RC微控制器和GSM移动通信网络中的短消息业务,设计一种基于TC35I的汽车空调温控系统,详细阐述了系统的基本组成和相关的软硬件方面的设计.系统具有实时性、操作简单、实用等优点.