Structural Health Monitoring System Design Based On Rf Energy Harvesting

Structural health monitoring can efficiently mitigate risks incurred by structure damage,which is of great significance to property safety.Traditional structural health monitoring systems mainly based on wired sensors,which is inconvenient to cabling and measurement.The emergence of wireless sensor networks facilitate the measurement of structral parameters,whereas most of the existing systems are powered by batteries which limit the lifetime of the whole network.In order to achieve long-term monitoring of internal structural health,this thesis design and implement self-powered structural health monitoring systems based on RF energy harvesting.The contributions of this thesis are four folds:1.Elaborate the architecture of the rechargeable structural health monitoring system and the operating principal of the core modules.Propose the real-time and long-term structural health monitoring system which can be used to two different scenarios.Based on the energy harvesting model,this thesis analyze the a series of methods to improve the efficiency of RF energy harvesting and calculate the optimal energy storage level where leakage current is considered.Besides,this thesis propose the sleep-wake work pattern to save energy based on the energy consuming model.2.Aiming at the scenario of erection of steelwork which requires multiple nodes monitoring,tiny,real-time and low cost,this thesis design an ultra-low power real-time structural health mon-itoring system based on RFID Communication,which includes sensor node hardware design,EPC C1G2 protocol stack and user display program,with strain and temperature data obtained timely.3.Build a practical test-bed to evaluate the energy harvesting and consuming performance,sensing performance and communication performance of the aforementioned system.The experi-ment results show the stability of the system with high energy harvesting and consuming efficiency.Besides,the collected data of the system is accurate enough,which reach the primal aim of struc-tural health monitoring system design.