Research and Application of Monitoring System Based on Wi-Fi for Environmental Protection Equipment

随着现代科学技术的飞速发展、人口的快速增长以及社会生产力的不断提高，环境问题越来越成为整个社会关注的问题。实践证明，环境问题的解决依靠先进可靠的环保设备以及严格完善的管理。但是在实际中由于经济利益等原因，很多工厂企业即使安装了环保设备也不使用。所以开发一个能够远程、自动、实时监测环保设备工作情况的系统具有现实意义。 通过对环保设备特点的分析以及常用数据传输方式的对比，本文选择通过监测环保设备电源的运行情况来判断其工作状态，并且使用Wi-Fi技术作为数据传输的方式。在此总体方案的基础上，本文详细分析了数据链路的构建、数据采集器的设计以及人机交互设备的实现。 数据链路是整个远程监测系统的数据传...With the rapid development of modern science and technology, the rapid population growth and the continuous improvement of social productivity, the environment problem becomes a great concern of the society. Practice has proved that the solution of the environmental problems can rely on advanced and reliable equipment and strict management. But in practice, due to the economic interests, many ente...学位：工学硕士院系专业：物理与机电工程学院_测试计量技术及仪器学号：1992012115270

一种基于各向异性磁传感器的车辆检测方法

针对目前车辆检测方法受环境影响大、精度低、成本高和安装维护复杂等问题,文章提出一种基于各向异性磁阻效应的车辆检测方法,利用两个各向异性磁阻传感器组成三轴检测电路,通过检测车辆对地磁场的扰动来进行车辆检测。详细了介绍了地磁检测原理、硬件构成和软件设计,实验结果证明利用该地磁检测模块进行车辆检测有一定的优势

Rotation rate analyses and measuring methods of DC motors

为提高直流电机的速度检测效率,实现规模化生产中电机速度指标的在线检测,对现有直流电机的速度检测方法进行了总结。通过对直流电机电枢电流的分析,得出电枢电流的时间响应由衰减的指数分量、直流分量和正弦分量构成,从而得出电枢电流携有正弦分量的结论,进一步推导出正弦分量与电机转速的关系,由此得到了一种根据电机电枢电流测量电机转速的方案。经在线实际测量使用,结果表明,该方案具有简单、可靠、高效的特点。In order to increase rotation rate detection efficiency of DC motors and achieve online detection of rotation rates in mass production, existing rotation rate detection methods for DC motors are summarized in this paper.Based on the analyses of DC motor armature current, the conclusion is got that time response of armature current consists of attenuation index component, DC component and sinusoidal component.Thus it comes to the conclusion that armature current has sinusoidal component.Further the relationship between sinusoidal components and the rotation rate is deduced.So a solution for rotation rate measurement is given according to the armature current of DC motor.The results of online practical tests show that the method is simple, reliable and high effi ciency

A Double Time Constant Charge and Discharge Modeling and Simulation of Lithium Battery

根据动力锂离子电池充放电特性建立了一种采用快慢电容回路模拟充放电双时间常数动力锂电池的电池模型.详述了模型建立的理论推导过程,经仿真表明,该模型能够准确地反映动力锂电池充电及放电特性以及荷电状态(SOC)的动态变化.According to charging and discharging characteristics of lithium batteries,this paper develops a lithium battery model to simulate the charge and discharge process with fast and slow capacitance double-time constant circuit,and details the theoretical derivation procedure that has developed the model.The simulation result shows that the model can accurately reflect lithium battery charge and discharge characteristics and dynamic changes of the charge state.厦门市科技计划项目(3502Z20123013