期刊
SMART MATERIALS AND STRUCTURES
卷 24, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/24/2/025023
关键词
cement-based piezoelectric composite; smart traffic monitoring system; mechanical-electrical conversion; vehicle speed detection; weigh-in-motion measurement
资金
- Ministry of Science and Technology of China [2015CB655100]
- Hong Kong Research Grant Council [615412]
- Bureau of Science and Information Technology of Guangzhou Municipality Government [2013J4500069]
Cement-based piezoelectric composites are employed as the sensing elements of a new smart traffic monitoring system. The piezoelectricity of the cement-based piezoelectric sensors enables powerful and accurate real-time detection of the pressure induced by the traffic flow. To describe the mechanical-electrical conversion mechanism between traffic flow and the electrical output of the embedded piezoelectric sensors, a mathematical model is established based on Duhamel's integral, the constitutive law and the charge-leakage characteristics of the piezoelectric composite. Laboratory tests show that the voltage magnitude of the sensor is linearly proportional to the applied pressure, which ensures the reliability of the cement-based piezoelectric sensors for traffic monitoring. A series of on-site road tests by a 10 tonne truck and a 6.8 tonne van show that vehicle weight-in-motion can be predicted based on the mechanicalelectrical model by taking into account the vehicle speed and the charge-leakage property of the piezoelectric sensor. In the speed range from 20 km h(-1) to 70 km h(-1), the error of the repeated weigh-in-motion measurements of the 6.8 tonne van is less than 1 tonne. The results indicate that the embedded cement-based piezoelectric sensors and associated measurement setup have good capability of smart traffic monitoring, such as traffic flow detection, vehicle speed detection and weigh-in-motion measurement.
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