A strain-sensing based scheme for indoor localization: Analysis,algorithm, and demonstration

In this work, a strain-based positioning problem is analyzed for indoor localization applications. This inverse mapping problem for estimating force-applied location by a few known strain data is formulated and analyzed for a square plate structure. Finite element (FE) simulations are performed to obtain the correlation between the force-applied location and the output index, which is a combination of measurable strain-gauge signals. Due to nonlinear coupling between major axes, the effective zone, which guarantees localization with sufficient accuracy is poor and must be enhanced. A novel iterative scheme is then proposed and implemented, aiming to improve the resolution and the effective zone. By such an effort, the spatial resolution is improved, and the effective zone is enhanced based on the simulation results. Meanwhile, a prototype of localization system is also constructed as the first step toward experimental demonstrations. The test results agree with the theoretical prediction qualitatively and the effective zone indeed can be further improved from 39% to 57% by the iterative algorithm based on a ±5% spatial uncertainty. The lessons and conclusion learned from this work serve as the basis for the 2D smart-floor tile designs currently underway for smart building applications.     

Presenting directions with a vibrotactile torso display

Vibrotactile displays covering the torso present spatial information in an intuitive way since the stimuli are directly mapped to the body coordinates; left is left, front is front, etc. The present study investigated the direction in the horizontal plane to which a specific torso location is mapped using a 15 tactor linear display. Participants indicated the observed external direction of a localized vibration by positioning a remotely controlled cursor. The results show that the observed direction is toward the midsagittal plane (i.e. the navel or the spine) compared to the tactor direction. This bias is consistent over the observers tested, and up to 10° for the oblique directions. Inspection of the response patterns revealed that observers did not use the body midaxis as the origin for the observed direction, but used two spatially separated internal reference points, one for each body half. Therefore, the use of a torso-related transfer function in applications that require a high level of precision is suggested. The variability of the responses also depends on the tactor direction. It is higher for the left?–?right direction and lower for the fore?–?aft direction, which may be caused by the spine and navel acting as anchor points. The present results are relevant for tactile navigation displays for visually handicapped individuals or for jet pilots.     

棉与木棉混纺防羽绒织物的性能研究

探讨影响棉/木棉混纺防羽绒织物的防钻绒性和手感的因素。采用棉/木棉混纺纱和纯棉纱以不同后整理方法试制了5种防羽绒织物,测试了各防羽绒织物的防钻绒性、弯曲性能和剪切性能,并分析了织物防钻绒性的影响因素及弯曲性能和剪切性能与织物手感间的关系。试验发现,14.6 tex棉/木棉混纺纱与11.7 tex纯棉经纱交织的防羽织物具有较好的防钻绒性,并且织物弯曲刚度低、手感柔软、布面细洁,隔离螨虫效果达90%以上,应用价值较高。认为:棉/木棉混纺织物的防钻绒性与木棉纤维的低线密度紧密相关。目前的防羽后整理工艺对提高织物防钻绒性能有限,从纤维原料和织物结构入手可以大幅度提高织物防钻绒性。     

弹丸贴膛运动的研究

本文建立了非对称弹丸前定心部紧贴膛壁情况下的横向运动微分方程,对对称和非对称弹丸在膛内的贴膛运动规律进行了电算,得到了若干重要结论。     

塑料挤出机计算机控制系统

本文介绍变结构预测控制技术,触摸屏彩色图形界面,模块化结构在塑料挤出机中的应用。     

基于ZigBee的断路器动触头温度智能测控系统设计

针对传统温度智能测控系统在有强电环境干扰下控制效果差的问题,提出了基于ZigBee的断路器动触头温度智能测控系统设计。根据系统总体结构和软件部分设计思路,使用CC2350射频电路通过串口与上位机进行交互,采用RS-485总线与ZigBee协调器进行数据传输,采用铝合金外壳CNC数控加工的定制DTS光纤传感器,通过CC2350射频电路,将传输温度数据实时发送到ZigBee终端节点。通过腾驰 XH-W1308数字温度控制器,进行相应控制。依据软件设计流程,制定具体温度控制规则,采用ZigBee技术实现强电环境干扰下的断路器动触头温度智能测控系统设计。由实验结果可知,该系统控制效果最高可达到99%,为温度智能控制提供设备支持。     

调光台灯的设计

台灯在目前社会已经相当普及,主要用于卧室床头柜、矮柜或书房写字台,造型色彩千变万化。本设计主要是利用无线电遥控和触摸式两种方式对台灯进行调光的控制。灯光由暗变亮,按暗—亮—最亮—亮—微亮的顺序变化。该遥控、触摸两用调光灯电路以调光集成电路CS7232和无线电发收模块RCM-1A/RCM-1B为核心组成,具有电路简单、调光方便、性能可靠等优点,遥控距离为8—15m,为步进式调光,并具有记忆功能。     

起重机自动化在垃圾发电厂中的应用

采用触摸屏、PLC和变频器设计的桥式抓斗起重机控制系统,实现了调速的要求和保证了工作条件十分恶劣的垃圾抓斗系统运行的可靠性,同时提高了生产效率。     

车载式热解炉电气控制系统的设计

为了完成对车载式热解炉工作过程的自动化控制,从车载式热解炉工艺出发,应用PLC控制器和触摸屏技术开发并设计了一套电气控制系统。该系统采用触摸屏作为人机界面,具有手动、自动两种运行模式,可实现炉况实时监测、参数设定和修改等功能,并能方便、直观地对热解炉工作过程进行监控。该系统稳定性好、可靠性高、易于维护,提高了热解炉工作效率和自动化水平。     

基于SenchaTouch的移动书店设计与实现

为满足移动客户随时随地选购图书的需要,采用MobileApp移动框架SenchaTouch技术,设计开发一个移动书店。介绍网上书店的需求分析、关键技术和详细实现过程。经过测试表明,基于SenchaTouch的移动web应用具有良好的跨平台能力,能满足多种应用需求。