PCB平面绕组力矩电机闭环反馈式驱动系统设计

针对PCB平面绕组力矩电机运转时平稳性的问题,采用能实现极低导通电阻的IRF2807PBF MOS管作为驱动电路的主要芯片,结合IR2010s驱动芯片以及STM32F103ZET6主控芯片搭建整体的驱动电路,提升了在慢速情况下电路的驱动能力。利用SS361RT霍尔磁性位置传感器,形成速度闭环反馈,并运用自抗扰控制算法对速度增量进行控制,使用PI电流环对电流增量进行控制,最后通过SVPWM模块输出六路PWM脉冲序列控制三相全桥电路中的各相MOS管导通,从而实现了一种针对PCB平面绕组力矩电机的PWM闭环反馈式平稳调速驱动系统。通过仿真和实验表明,相比于使用传统的PI速度环设计的电机驱动系统,该驱动系统在相同转速下能大大提升电机运行时的平稳性。将驱动系统用于光学生物测量仪PCB平面电机控制的延迟线部分,能使延迟线平稳低速运行,保证了测量精度。     

基于STM32单片机的数字直流调速系统的设计

本文介绍了一种基于STM32F103的全数字直流调速系统。首先分析了直流调速系统的控制原理,然后利用STM32F103单片机产生PWM控制信号,并在软件中应用增量式PID的速度闭环来完成直流电机的调速控制方案。文中着重分析了电机的控制模块、检测电路、驱动电路等硬件电路构成及相应的软件编程设计,最后搭建了小功率直流电机直流调速实验系统。实验及结果分析表明:该方案具有性价比高、可靠性好、精度高的优点,并验证了设计方案的可行性和合理性。     

基于STM32的开关磁阻电机控制器的设计

以ARM内核的STM32 F103 RBT6为主控芯片设计了低成本、高性能三相开关磁阻电机驱动控制器.该控制器的主电路由IGBT构成不对称半桥回路,由低成本的隔离驱动芯片PC923直接驱动,具有过流、过压和欠压保护功能.采用以低速时电流斩波控制和高速时角度位置控制相结合的控制手段,系统运行可靠,性能优良.详细介绍了系统功能和软硬件设计并给出实验结果.     

无线数据传输设计在电火花震源地震勘探中的应用

为实现电火花震源在陆上无电缆地震勘探作业,解决电缆自身存在的体积庞大、不易搬运、易损坏等问题,采用XL-01数字音频模块,STM32F103ZET6作为核心控制模块,设计一套无线数据传输系统,应用于电火花震源勘探系统中,并给出软、硬件的技术实现;上位机方面采用STM32F103ZET6作为核心控制器,搭载内部12位ADC作为数据采集,采集到的数据均通过串口上传至PC端。结果表明:该系统在数据传输无缆施工中有显著意义,并能为相关行业的发展提供新思路。     

Delta机器人控制系统研究

随着Delta机器人的迅速发展,其应用范围越来越广,对控制系统性能的要求也越来越高。为满足复杂的工业环境需求,提高控制器的开放性和通用性,设计并测试了一种开放式Delta机器人控制系统。系统硬件方面以微控制器STM32F103ZET6和运动控制芯片MCX514为核心芯片,并基于STM32F103ZET6配备了USB接口和以太网接口,以满足不同的接口需求。软件方面分别使用C语言开发上位机,采用串口和以太网协议作为通信协议。该控制系统成本低、开放性强。试验结果证明,系统精度高,运行稳定,能准确控制机器人进行连续运动。     

基于双STM32的行车辅助信息记录装置设计

分析行车监测研究现状,并设计一款多功能且操作简单的行车辅助信息记录装置.该装置具备图像采集、监测车内温度、湿度、气压及车外障碍物距离等功能,并将数据存储于SD卡内,显示在LCD上.选择2个STM32F103ZET6作为主控芯片,配以电源电路、图像采集模块、行车参数监测模块、液晶显示模块和SD卡存储模块,并采用CAN总线通信方式实现主机和从机的通信.实验测试结果表明,该装置模型具有实时显示及拍照、行车参数采集与图像存储等功能.     

基于STM32和LABVIEW的多通道DNA合成仪控制系统的设计

将合成DNA的固相亚磷酸酰胺法与自动控制技术相结合,设计了一款基于STM32的96通道寡核苷酸长链的合成仪.该DNA合成仪以STM32F103ZET6微控制器为主控芯片,接收、处理上位机发送的指令,并控制外围的执行单元.人机交互界面采用LabVIEW开发,具有合成序列多通道输入、工作状态监控、与主控系统实时通信等功能.该DNA合成仪控制系统可同时实现96个独立通道的寡核苷酸长链的合成,具有合成效率高、操作界面友好、操作方便等优点,完全满足中小型实验室及社区医院的碱基合成需求.     

基于传感器信息采集技术的酒精浓度监测系统的研究与设计

为了解决传统酒精检测系统稳定性差、系统重复利用恢复慢、数据采集不准确和无法实时与在线系统对接等问题,设计了一套基于嵌入式ARM芯片STM32F103C8T6的酒精浓度监测系统。首先,进行了酒精浓度监测系统总体结构设计,主要包括主控芯片、酒精浓度检测传感器、信息调频模块、语音警报和屏幕显示等模块。然后,对该系统的硬件结构电路进行了详细设计,包括STM32F103C8T6电路连接设计、传感器电路设计和传感器性能测试、语音警示电路设计和音频功放电路设计等。最后,对该系统的软件流程进行了设计说明,主要详细介绍了系统控制流程和系统A/D中断流程设计。该酒精浓度检测系统能够快速灵敏的对被测人的饮酒状况进行详细检测、警报、数字显示、语音提醒和数据实时上传等功能,具备很强的实际使用价值。     

基于语音识别和无线传感的家居安全预警系统

为了安全、舒适和便捷的家居环境需要,提出了一种基于STM32F103ZET6处理器为核心的安全预警系统方案,包含语音识别模块和无线传感网络.本系统通过传感器实时监测家居环境,一旦达到阈值,通信模块发送短信给用户,并借助无线通信模块实现图片传输,用户可通过不同语音指令来实现自动拨号功能.实验结果表明,本系统具有智能化、性能稳定等优点,语音识别算法改进后较好的提高了识别率.     

太阳能辅助充电型节能爬楼梯电动轮椅设计

从助老助残的需要出发,以节能环保和降低成本为目标,采用30W太阳能电池板作为辅助充电电源,以STM32RCT6单片机为控制芯片研制了一款电动轮椅控制器。首先介绍了太阳能系统的组成,然后介绍控制器的组成功能模块及详细分析了其控制及驱动电路的原理,包括H桥驱动电路构成及分类、电源芯片的选择、通信方式选择、电机电流、蓄电池电池电压采集及液晶显示等硬件电路的设计。实验结果表明该控制器满足较大功率直流电机的驱动需要,控制灵活,满足老弱及下肢患者的操作需要,具有实用价值。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with