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In power electronic devices, the winding temperature of the transformer in operation needs to be monitored in real time. But the Electromagnetic Interference(EMI) problems cause the measured winding temperature fluctuates anomalously. In this paper, the 10MVA transformer in the cabinet of a transformer rectifier is studied as a specific case, the temperature measurement circuit of the transformer...
The paper introduces a pulse wave sensor position system based on ZigBee technology. The system is made up of remote server, reference nodes, gateway nodes, master nodes and many location nodes on human body. Location nodes collect pulse waves and position information, and transmit these information to master nodes from ZigBee network. The server finds those humans whose pulse waves are abnormal and...
This paper describes the structure and the control mechanism of network layers based on wireless communication technology, and introduces the control requirements and realization methods for the automatic control modules. The paper first describes the realization of controlling the frequency variable system in the control unit and its serial communication with GPRS communication module. It then provides...
Acoustic emission testing technique is a dynamic testing technology. In this paper, the relationship between the cumulative energy of acoustic emission and lower cycle reversal loads is studied based on results of the experiments on underwater concrete columns, and waveform acoustic emission signal of different destruction states is picked up. Spectrum analysis is carried out, the results of which...
This paper describes a dynamic distributed monitoring scheduling algorithm (SOMSA) for sensor networks based on artificial neural-networks self-organizing maps algorithm. During the training, the stable sensor nodes compete and cooperate with their neighbors to study the input patterns of the environment and update their internal prototype vectors using only local sensing and interactions. The adjustment...
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