Abstract
Traditional bridge monitoring has found it difficult to meet the current diversified needs, and frequent replacement of sensor batteries is neither economical nor environmentally friendly. This paper presents a wireless acceleration sensor with low power consumption and high sensitivity through integrated circuit design, data acquisition and wireless communication design, package design, etc. The accuracy of the sensor in data collection was verified through calibration and performance comparison tests. The ability of triangular piezoelectric cantilever beam (PCB) was tested through design and physical manufacture. Finally, the self-powered performance of the sensor was tested by connecting the sensor and the triangular PCB through a circuit, which verifies the feasibility of using the PCB to collect bridge vibration energy and convert it into electrical energy to supply power for sensor, and also explore the green energy collection and application.
Highlights
With the rapid development of microelectronics, the sensors used in bridge health monitoring are trending towards low power consumption, low cost, small size and wireless communication [1]
A piezoelectric energy harvesting device can install eight triangular piezoelectric cantilever beam (PCB) which were designed in this paper, so it can generate 1.96 J in 1 h, which can be used for the wireless acceleration sensor to transmit data 217 times
This paper developed a wireless acceleration sensor that is suitable for bridge vibraFigure
Summary
With the rapid development of microelectronics, the sensors used in bridge health monitoring are trending towards low power consumption, low cost, small size and wireless communication [1]. The bridge vibration frequency is low, and the piezoelectric cantilever beam used for bridge vibration energy collection must have a very low resonance frequency and high performance output. The structure of the PCB is studied and optimized to improve the piezoelectric output performance according to the characteristics of the bridge vibration. A piezoelectric transducer device suitable for bridge vibration energy collection and wireless sensor power supply is developed, which realizes the self-powered performance of bridge sensor nodes. The voltage of the triangular PCB developed in this paper reaches the first peak value of 51.6 V at 3.2 Hz, and the voltage reaches the second peak value of 77.2 V at 12.1 Hz; its resonance frequency is lower than that of the cantilever beam developed by previous scholars, and the output performance is higher, which is more suitable for application in the bridge’s low frequency vibration environment
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