Research And Experiment Of Resonant Road Sensor

With the rapid development of expressway and automobile industry,the traffic accidents caused by accumulation are increasing year by year,and the monitoring of road surface condition is becoming more and more significant.So,the research of road sensor is developing at high speed.By analyzing the present situation and the mainstream of a variety of road sensors at home and aboard,and finally proposed the use of resonant frequency measurement method to develop a new road sensor.The resonant frequency is measured by a sensitive element of a constant-elastic alloy with piezoelectric ceramic(PZT).The influence factors of the resonant frequency of the circular thin plate are analyzed by mathematical modeling.Then,the finite element simulation of the sensitive element is carried out.The simulation results are in accordance with the mathematical formula.Through the material selection and mechanical structure to make it suitable for complex road conditions.Circuit design to complete the various modules(power module,microcontroller module,frequency generation module,signal processing module,etc.).And the resonant frequency is measured by the secondary frequency sweep method.Finally,the algorithm on the server-side the sensor data to obtain the final road condition.The cable between the sensor and the transfer station make it difficult in installation process.So,a wireless solution is put forward.The sensor and the transfer station use Zig Bee communication.The transfer station communicates with the cloud server using GPRS.The user accesses the cloud server through We Chat.A large number of water icing tests are taken in the laboratory.The Thesis analyzes the phenomena and problems in the experiment,and puts forward the corresponding solutions to the existing problems.And the test in the actual road environment achieve a good result.