Energy harvesting and speed sensing with a hybrid rotary generator for self-powered wireless monitoring
王志霞 1邱宏蕴 2焦宣博 2王炜 3张琪昌 3田瑞兰 4曹东兴5
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作者信息
1. School of Mechanical Engineering,Tianjin University Tianjin 300350,China;Tianjin Key Laboratory of Nonlinear Dynamics and Control,Tianjin 300350,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
2. School of Mechanical Engineering,Tianjin University Tianjin 300350,China
3. School of Mechanical Engineering,Tianjin University Tianjin 300350,China;Tianjin Key Laboratory of Nonlinear Dynamics and Control,Tianjin 300350,China
4. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Mechanics Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
5. Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China
Real-time onboard health monitoring systems are critical for the railway industry to maintain high service quality and operational safety.However,the issue with power supplies for monitoring sensors persists,especially for freight trains that lack onboard power.Here,we propose a hybrid piezoelectric-triboelectric rotary generator(HPT-RG)for energy harvesting and vehicle speed sensing.The HPT-RG incorporates a rotational self-adaptive technique that softens the equivalent stiffness,enabling the piezoelectric non-resonant beam to surpass resonance limitations in a low-frequency region.The experiments demonstrate the feasibility of using the HPT-RG as an energy harvesting module to collect the rotational energy of the freight rail transport and power the wireless temperature sensors.To allow multiple monitoring in confined spaces on trains,a triboelectric sensing module is added to the HPT-RG to sense the operation speed and mileage of vehicles.Furthermore,the generator exhibits favorable mechanical durability under more than 600 h of official testing on the train bogie axle.The proposed HPT-RG is essential for creating a truly self-powered,maintenance-free,and zero-carbon onboard wireless mon-itoring system on freight railways.
关键词
Energy harvesting/Speed sensing/Rotational self-adaptive technique/Low-frequency/Self-powered wireless monitoring
Key words
Energy harvesting/Speed sensing/Rotational self-adaptive technique/Low-frequency/Self-powered wireless monitoring
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