Feasibility for Utilizing IEEE 802.15.4 Compliant Radios Inside Rotating Electrical Machines for Wireless Condition Monitoring Applications
Feasibility for Utilizing IEEE 802.15.4 Compliant Radios Inside Rotating Electrical Machines for Wireless Condition Monitoring Applications
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DOI：
10.1109/jsen.2018.2821266
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发表时间：
2018-05-15
影响因子：
4.3
通讯作者：
Lee, Meng Yeong
中科院分区：
文献类型：
--
作者：
Kumar, Padmanabhan Sampath;Xie, Lihua;Lee, Meng Yeong
用于旋转电机的常规状态监测系统主要基于外部可用信号，而内部信号，特别是转子上的内部信号，仍然相对未被探索。为了访问这些内部信号，无线传感器在成本和易于部署方面提供了有效的解决方案。然而，电机内部的环境偏离了典型的无线RF应用，并且需要评估这种情况下的通信链路可靠性。本文探讨了利用无处不在的IEEE 802.15.4-2.4 GHz兼容的无线电的电机内的无线传感器部署的可行性。通过一系列的测量实验，研究了在多径效应、多普勒频移、磁场干扰、封闭体屏蔽等突出环境因素下的链路质量特性。分组接收速率、接收信号强度和链路质量指标被用作量化链路性能的度量。据观察，相反，流行的信念，机器内的节点之间的链路质量并没有恶化，事实上被发现是增强。对于放置在机器内部和外部的节点之间的连接，观察到较差的链路质量。此外，链路质量高度依赖于空间位置并且易于受到干扰。然而，可以以高发射功率为代价来建立足够稳定的链路。这些实验结果表明，无线射频传感器节点可以部署在电机内部，它打开了一个机会，探索侵入性状态监测系统。
The conventional condition monitoring systems for rotating electrical machines are predominantly based on externally available signals, while the internal signals, especially on the rotor, remain relatively unexplored. To access these internal signals, wireless sensors offer an effective solution in terms of cost and ease of deployment. However, the environment inside an electrical machine deviates from a typical wireless RF application and communication link reliability under such scenarios needs to be assessed. This paper explores the feasibility of utilizing the ubiquitous IEEE 802.15.4-2.4 GHz compliant radios for wireless sensor deployment inside an electrical machine. A series of measurements are made to experimentally investigate the link quality characteristics under the prominent environmental factors such as the multipath effect, Doppler shift, magnetic field interference, and shielding effect of the enclosure. Packet reception rate, received signal strength and link quality indicator are used as the metrics to quantify the link performance. It is observed that contrary to popular belief, the link quality between nodes inside the machine is not deteriorated and in fact is found to be enhanced. A poor link quality is observed for the connection between nodes placed inside and outside the machine. Moreover, the link quality is highly dependent on spatial position and prone to interference. However, a sufficiently stable link can be established at the expense of high transmit power. These experimental findings indicate that wireless RF-based sensor nodes can be deployed inside an electrical machine and it opens an opportunity to explore invasive condition monitoring systems.