Electro-Discharge Fine Truing of Metal-Bonded Fine-Grain Diamond Wheel Based on Real-Time Monitoring

A data acquisition system based on LabVlEW is designed and implemented, and electrodischarge(ED) fine truing of metal-bonded fine-grain diamond wheel based on real-time monitoring is researched. Real-time monitoring not only makes efficient impulse specification of ED truing easily obtained, but also is good for timely identifying no-load, avoiding short circuit and arc discharge phenomena and then for obtaining normal machining state. ED fine truing of the fine-grain wheel includes two steps: rough truing for high efficiency and fine truing for high precision. Final ED truing precision and efficiency not only depend on electric process specification, but also is concerned with electrode shape, insulated performance of operating fluid and vertical feed quantity value and frequency. Experiments indicate that ED fine truing based on real-time monitoring can improve the truing precision and efficiency. Average machining efficiency of W10 wheel is about 0.95μm/min； the final run-out by ED truing is less than 2μm.     

基于 LabVIEW 的机械臂实时动画显示系统

为解决机械臂运行过程中受地域条件等因素影响导致各关节运行位置观察不便的问题,结合 3D 动画显示、机械臂操控系统,设计了基于 LabVIEW 的六自由度机械臂运行实时显示系统。系统建立动画显示区、运行控制区等界面,实现六自由度机械臂关节的实时显示与控制,通过机械臂运行时的 3D 动画监控,显示六自由度机械臂运行状况。该系统对工业生产和实际生活有较大应用价值。     

基于无线传感器的远程实时监控与固件更新系统设计

针对工业生产中难以监控传感器状态的问题,设计一个物联网系统,实现远程传感器数据监控与固件更新。该系统由远程实时监控系统与远程固件更新系统组成,传感器采用嵌入式实时操作系统。在远程实时监控系统中,传感器可调节频率测量数据,基于消息排队遥测传输协议,通过无线网络将数据传输到服务器。为使远程固件更新系统运行符合限制应用协议,传感器连接至轻量级物联网协议服务器,再通过网关连接到hawkBit服务器中,基于超文本传输协议与轮询方式,由hawkBit提供远程更新服务。实践操作表明,该系统操作简单,具有可视化、直观的优点,可满足大型工厂远程实时监控与固件更新需求。     

电流变液可变阻尼减振数控机床实时控制系统

通过自动可调高压直流电源的电压大小可随数控机床主轴的振幅进行实时调节。使加在电流变液阻尼器中电压值发生变化，电流变液的黏度值随之发生改变，嘲而改变阻尼器的阻尼值和主振系的刚度值及主轴的振幅，最终达到控制数控机床主轴振幅的目的。该研究建立振幅-电压-阻尼三者的减振模型。振幅实时控制系统采用PID控制，并对系统性能进行了分析和预测。     

Towards multimodal emotion recognition in e-learning environments

This paper presents a framework (FILTWAM (Framework for Improving Learning Through Webcams And Microphones)) for real-time emotion recognition in e-learning by using webcams. FILTWAM offers timely and relevant feedback based upon learner's facial expressions and verbalizations. FILTWAM's facial expression software module has been developed and tested in a proof-of-concept study. The main goal of this study was to validate the use of webcam data for a real-time and adequate interpretation of facial expressions into extracted emotional states. The software was calibrated with 10 test persons. They received the same computer-based tasks in which each of them were requested 100 times to mimic specific facial expressions. All sessions were recorded on video. For the validation of the face emotion recognition software, two experts annotated and rated participants’ recorded behaviours. Expert findings were contrasted with the software results and showed an overall value of kappa of 0.77. An overall accuracy of our software based on the requested emotions and the recognized emotions is 72%. Whereas existing software only allows not-real time, discontinuous and obtrusive facial detection, our software allows to continuously and unobtrusively monitor learners' behaviours and converts these behaviours directly into emotional states. This paves the way for enhancing the quality and efficacy of e-learning by including the learner's emotional states.     

实时全息测量中干涉条纹的检测方法

针对实时全息干涉条纹的特点,结合视频运动检测技术,提出了一种具有一定抗干扰能力的干涉条纹检测技术及其实现算法.     

B超诊断仪中鼠标轨迹包围面积的实时计算

本文分析了B超诊断仪中鼠标轨迹包围面积的实时计算处理方法,重点解决了复杂轨迹下如何避免面积重复计算的问题,推导归纳出能够用于实时处理的实用算法。通过多组数据进行测量对比,进一步验证了算法的正确性和实用性。     

基于两阶段Stackelberg博弈的实时电价分布式优化

以降低峰均比即平衡负载时序为目标,采用用户用电计划和效用函数两个指标对家电进行分类,在提出的效用最大化用户目标函数基础上设计两阶段Stackelberg博弈模型,通过用户的个体优化行为实现对实时电价的分布式优化,最终达到博弈均衡。仿真结果显示,其系统负载下降了14%,峰均比下降了47%,且新机制下的负载时序和电价时序相较原负载时序与电价时序实现了明显的平衡效果,表明该模型能够有效降低峰均比并平衡负载时序,提高电力系统负载稳定性。     

《工程测试技术》项目教学法的研究与实践

《工程测试技术》是一门体系庞大,知识覆盖面广,理论性和应用性都很强的学科,但是内容过于繁杂,学生难以理清掌握。该门课在实施教学中,以油气管道的自动化巡检为例,采用项目教学方法,通过问题引导和工程实践加深学生对该课程进行深入的理解与掌握。该项目研发一种自动化油气管道自动巡检平台,解决固定布局式传感器所存在误检漏检率高的问题,同时减少人工介入,实现全天候无缝隙巡检。采用气体传感器、光电传感器、GPS定位传感器等,并搭载通信传输系统和控制系统,实现了具有完整功能的测试系统。该项目的顺利实施使得学生对该门课程得到了新的领悟,提高了学习兴趣、自学能力和创新能力。     

基于贝叶斯网络的无线Ad Hoc网络视频传输方法

针对AdHoc网络的视频传输,提出了一种新的网络带宽预测及控制方案．该方案基于跨层、接收端反馈以及贝叶斯网络等技术．对视频传输过程进行公式化描述,从而推导出影响视频传输质量的几个主要因素,这些因素可以通过跨层机制或接收端反馈的方式获取．根据这些影响因素,确定变量集和贝叶斯网络拓扑结构,从而构建贝叶斯网络预测模型．预测结果作为AdHoc网络带宽,根据该带宽值来控制视频编码器,动态调节输出的实时视频流码率．为验证该方案,对整个视频通信系统进行了仿真．结果显示,跟传统的传输方案相比较,夺方案能更好地利用网络带宽,减少了数据包的丢失,提高了实时视频质量．