Transactions of Nanjing University of Aeronautics & Astronautics
LowCost Wireless Sensor Network Node Design for Multi-point Bolt Loosening Detection
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Abstract:
Bolted connections are commonly used in aerospace structures. Once the bolts on the aircraft are damaged or loose, the consequence will be disastrous. Therefore, monitoring bolt loosening is especially required. However, periodic manual inspection costs much money and time. And it is very difficult to achieve multipoint monitoring for many bolted structures in an aircraft. Therefore, a lowcost, reliable detection method based on wireless sensor networks is presented. The reed switch is selected as a sensor for bolt loosening monitor. The chip PT2262 and PT2272 are chosen as hardware codec chip for multipoint placement. A wireless transmitter and receiver circuit is designed on 315 MHz frequency. The codec chip and the wireless transmission are triggered by the reed switches. Ｂolt loosening is detected by the receiving terminal and indicated by light and sound alarms. The wireless transmitter and ｔｈｅ receiver circuit are test ed and the monitoring system is erified by experiments. The results show that bolt loosening can be effectively detected within 300 m. The developed sensor network is expected to solve multipoint bolt detection problems and provide a low cost and reliable monitoring technology.
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Project Supported:
the National Natural Science Foundation of China (Nos.51105209, 61401211,51175267), the China Postdoctoral Science Foundation (Nos.2012M5 11760, 2013T60540), the Specialized Research Fund for the Doctoral Program of Higher Education (No.20113219120005), the Jiangsu Province Science and Technology Support Program(No.BE2012034), the Ministry of Science & Technology of Zhengzhou (No.131PPTGG425), and the Zijin Intelligent Program of Nanjing University of Science and Technology (No.2013ZJ0203).
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