Research On Piezoelectric Transducer For Slotted-cymbal Transducer Of Health Monitoring System In Asphalt Pavement

The durability and safety of pavement and bridge are increasingly caused widespread concern. So applying the health monitoring of pavement and bridge is essential, however, the micro power of which is not conductive to long-term monitoring. Applying the Cymbal transducers to supply power for the health monitoring system because of piezoelectric ceramics can convert much mechanical energy into electrical energy. But Cymbal transducers found that there are large circumferential stress concentrations leading to a low energy conversion efficiency and short service life in the transducer. Slotting the surface of mental cap can improve the piezoelectric performance of transducers. Machinery energy recovery from pavement and bridge based on piezoelectric transducer consistent with sustainable development and the concept of low-carbon,It is an effective way of energy recovery and has great research value. This article takes the analysis method of combining with the asphalt pavement and environmental characteristics, analysising the theoretical, finite element simulation and performance analysis. Specific for the following several aspects:Firstly, according to the basic theory of piezoelectric coupling and the characteristics of vehicle load, piezoelectric structure suitable for asphalt pavement was choosed, the structure of piezoelectric transducer and the characteristics of piezoelectric transducer output were analysised, the factors that have an effect on output voltage and electric energy were determined.Secondly, the Finite Element Analysis model of the Cymbal piezoelectric transducer buried in asphalt pavement is presented and calculated by the ANSYS program. Geometry parameters can be optimized by analyzing regulation of their effect on the open circuit voltage of the transducer,the stress of mental cap and the stress of PZT. Proposing the evaluation factors of the coordination between Cymbal and asphalt pavement, and the optimal structure sizes of the embedded Cymbal transducers are obtained.Thirdly, there are large circumferential stress concentrations at the edge on the bonding of metal cap and piezoelectric ceramics, leading to a low energy conversion efficiency and short service life of the transducer. So the model of the slotted Cymbal piezoelectric transducer buried in asphalt pavement is builded by the ANSYS program, and reaching calcuation formula of electric energy applying to the slotted Cymbal transducers. Moreover,analyzing the performance influence on slotted parameters, load and embedment depth. The results show that the slotted Cymbal transducers can not only increase the output voltage, and in decreasing to stress has obvious effect.Finally, the electrical equivalent analysis of Cymbal transducer is put forward, and the finite element analysis of the composite Cymbal transducer is carried out by ANSYS program.The relationship between the connection mode and the output of the transducer is preliminarily discussed,and the characteristics of a variety of complex Cymbal transducers are proved. The results show that the effect of the Cymbal stack transducer is the best among the embedded composite Cymbal transducers.