WRSNS中SENSOR节点设计与充放电策略研究

发布时间：2018-06-29 08:53

本文选题：基于磁耦合谐振的无线电能传输(MCR-WPT) + 无线可充电传感器网络(WRSNs)　；参考：《天津工业大学》2017年硕士论文

【摘要】：基于磁耦合谐振的无线电能传输(MCR-WPT)技术,为无线传感器网络能量补充提供新的手段。利用MCR-WPT为网络节点补充能量,构建无线可充电传感器网络(WRSNs),目前成为无线传感器网络研究热点之一。在WRSNs中,能无线充电的节点设计以及节点间充放电策略直接影响到节点获取能量效率,决定网络的稳健性。本文基于磁耦合谐振无线电能传输特点,结合网络节点功能需求,采用双电源供电方式,设计可充电网络节点,保证节点供电的稳定性;在此基础上,分析节点充放电过程中传输频率、距离、负载对传输功率和传输效率的影响,试图寻找最佳充放电策略,为WRSNs能量分配提供依据。本文主要工作如下:基于MCR-WPT技术,设计可充电传感器节点,并搭建WRSNs网络。根据WRSNs节点的功能特点,提出节点设计要求及指标,并进行节点结构设计、硬件设计和软件设计。硬件设计中电源模块基于MCR-WPT技术,能够进行无线充电,采用双电源设计,保证节点能够稳定持续工作。研究MCR-WPT的功能特性,分析节点充放电过程中传输频率、距离、负载对传输功率和传能效率的影响。由研究结果得知,在最佳工作条件下,MCR-WPT能够以较高传能效率和较大传输功率进行无线能量传输。节点充放电策略研究。在节点无线充放电过程中,根据充电电池充放电情况进行分析,划分锂电池无充放电、锂电池充电不放电、锂电池放电不充电以及锂电池边充电边放电四种情况,并进行实验研究,分析结果。由结果得知,在传输距离Omm～130mm范围内,锂电池充电不放电情况下,能够以较高传能效率和较大传输功率进行能量补给,是最佳充放电策略。基于WRSNs网络实验平台,通过实验分析,结果为:所设计可充电节点满足设计要求,谐振频率为83KHz,在传输距离0mm～200mm、水平偏移-80mm～+80mm和偏转角度-50～+50度范围内,结合锂电池充电不放电情况下,节点实现最佳能量补给,延长生命周期。
[Abstract]:MCR-WPT (Magnetic coupled Resonance based Radio Energy Transmission) technology provides a new method for energy replenishment in wireless sensor networks. Using MCR-WPT to supplement the energy of network nodes to construct wireless rechargeable sensor networks (WRSNs) has become one of the research hotspots in wireless sensor networks. In WRSNs, the design of wireless charging nodes and the charging and discharging strategies between nodes directly affect the energy efficiency of the nodes and determine the robustness of the network. Based on the characteristics of magnetically coupled resonant radio transmission and the functional requirements of network nodes, this paper designs a rechargeable network node to ensure the stability of the node power supply. The effects of transmission frequency, distance and load on transmission power and transmission efficiency during charging and discharging of nodes are analyzed. The best charging and discharging strategy is sought to provide the basis for energy distribution of WRSNs. The main work of this paper is as follows: based on MCR-WPT technology, the rechargeable sensor node is designed and the WRSNs network is built. According to the functional characteristics of WRSNs node, the design requirements and specifications of the node are put forward, and the node structure design, hardware design and software design are carried out. In the hardware design, the power module is based on MCR-WPT technology, which can be used for wireless charging and dual power supply design to ensure that the node can work stably and continuously. The functional characteristics of MCR-WPT are studied, and the effects of transmission frequency, distance and load on transmission power and energy transfer efficiency are analyzed. The results show that MCR-WPT can transmit the wireless energy with higher energy transmission efficiency and higher transmission power under the optimal working conditions. Research on charging and discharging Strategy of Node. In the process of wireless charging and discharging of nodes, according to the charging and discharging situation of charging battery, there are four kinds of cases: no charge and discharge of lithium battery, no charge and discharge of lithium battery while charging. The experimental study was carried out and the results were analyzed. The results show that the best charging and discharging strategy is to supply the energy with higher energy transfer efficiency and higher transmission power under the condition that the charge of lithium battery does not discharge in the range of transmission distance of Ommna 130mm. Based on the WRSNs network experimental platform, the experimental results show that the designed rechargeable nodes meet the design requirements, the resonant frequency is 83 KHz, the transmission distance is 0 mm to 200 mm, the horizontal offset is -80 mm ~ 80mm and the deflection angle is -50 ~ 50 degrees. In the case of lithium battery charging without discharge, the node realizes the best energy recharge and prolongs the life cycle.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5;TP212.9

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