Research On Weigh In Motion System Based On Cement-based Piezoelectric Sensor

With the rapid development of social economy, the flow of transportation is growing fast.The overload phenomenon is becoming more and more common and serious. The overloadsnot only reduce the use efficiency of the road, but also cause severe damage to the road. Thesephenomenon have disrupted traffic orders, also they have caused large losses of nationalfinance and severely threatened people’s life safety. Weigh in motion (WIM) system whichcan dynamic monitor the vehicle load conditions to improve the management of highway, hasbecome an important national topic. This thesis does a research on key technologies of WIM,the main work is as follows:(1) On data processing technology of WIM, we have developed a new basic theoreticalalgorithm based on Duhamel integral and piezoelectric effect. So the axle weigh can becalculated by the basic theoretical algorithm if the voltage output is known. The basictheoretical algorithm has been verified with certain accuracy.(2) Aiming at reducing the speed influence on accuracy of the basic theoretical algorithm, thisthesis has proposed a WIM attenuation algorithm based on velocity. After verification, thisalgorithm greatly improves the accuracy of the basic theoretical model and reduces thevehicle influence on the test of the axle weigh.(3) Based on the above algorithm, we designed a weigh in motion system by using a new typeof cement-based piezoelectric sensor designed by the research group. Test data shows thatthe average system measurement error reaches as low as238%, reaching the measurementrequirements of weigh in motion systems with good prospects.