| In recent years,the technology of road vibration energy harvesting based on piezoelectric effect has received extensive attention from the business and academic circles.Because it can provide power for transportation ancillary facilities and low-power wireless sensor devices,thus providing support for the Internet of Things and intelligent transportation.Based on laboratory and field tests,this study combined theoretical analysis and finite element analysis to study the structure and fatigue life of two new piezoelectric transducers for road applications.The main contents are as follows:(1)Research on the lack of long term application research of road piezoelectric energy harvesters on roads.According to the theory of piezoelectric power generation and the main performance parameters of piezoelectric ceramics,combined with laboratory tests,the models of piezoelectric ceramics suitable for road power generation were selected,and finally the PZT-53 H was adopted.The fatigue degradation law of PZT-53 H piezoelectric transducer under traffic load was studied through ten million times of intermittent loading test,one million times of continuous loading test,different excitation frequency and load loading test.The fatigue life of road piezoelectric energy harvester was evaluated.Finally,SEM scanning electron microscope was used to observe the piezoelectric transducer before and after failure loading,and the micromechanism of fatigue depolarization was discussed.(2)Research on the problem of good output performance but insufficient bearing capacity and difficult curvature control of curved piezoelectric transducer.A new type of road-compatible Tile transducer with controllable curvature was developed.The effects of radius of curvature,thickness of spring steel sheet,boundary conditions and load distribution on the output power of Tile transducer were studied by laboratory tests.The results show that the Tile transducer has enough power to replace the battery and power the wireless sensor nodes for road and bridge health monitoring.(3)Research on the problem that the output power of road piezoelectric energy harvesters stay at milliwatt or even microwatt level.A watt-level road-compatible piezoelectric energy harvester based on an improved Drum transducer was developed,and its optimal size was determined by unit test and finite element analysis.The results of indoor and field tests show that the output power reaches tens of watts for the first time in all the researches at home and abroad.The application prospect of piezoelectric flooring and tunnel LED-induced lamp emergency system based on the watt-level road piezoelectric energy harvester was discussed. |
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