Finite Element Simulation Of Piezoelectric Performance Of Cymbal Transducer On Asphalt Pavement

At present,“carbon peak and carbon neutral” has become a national strategy,and the construction of a new power conversion system with new energy as the main body has become the hottest topic at present.When the vehicle is driving on the road,the pavement structure will vibrate due to the action of load.The piezoelectric energy harvester embedded in the asphalt road will collect and utilize the vibration energy generated,which has become a renewable energy supply technology with great development prospects.In this paper,the vibration energy generated by asphalt pavement is collected,Cymbal piezoelectric transducer is taken as the research object,and the structural model of Cymbal piezoelectric transducer and the structural model of asphalt concrete pavement are established by using the finite element analysis method and the structural mechanics and AC/DC module of the finite element software COMSOL.The electrical output performance of the piezoelectric energy harvester embedded in asphalt pavement is simulated and analyzed.The main research results are as follows:1.By establishing the electromechanical coupling finite element analysis model of Cymbal piezoelectric transducer,optimize the structural parameters and calculate and analyze the influence of the structural parameters on the electrical output performance;And the influence of external load resistance,vibration frequency and excitation load on the electrical output performance of Cymbal transducer.Finally,the optimal structural parameters of the Cymbal piezoelectric transducer are determined as follows: the diameter of the top cavity(Фd)is 18 mm,the thickness of the metal cap(tc)is 0.3 mm,the thickness of the piezoelectric ceramic(tp)is 1 mm,the height of the inner cavity(dc)is 1 mm,the diameter of the Cymbal(Ф)is 40 mm,and the end cover material is H62 bronze.The piezoelectric material is PZT-5H,and the resistance is in the range of 0-6 MΩ.The optimal external load resistance suitable for Cymbal piezoelectric transducer is 1 MΩ.At this time,the output voltage is about 100 V,and the output power is 9.8 m W.In the range of 0-20 Hz,the output voltage and output power of the Cymbal piezoelectric transducer increase gradually with the increase of vibration frequency and excitation load.2.In order to obtain better electrical output performance of Cymbal piezoelectric transducer.The spatial arrangement distribution and electrical connection mode of Cymbal transducer are studied,and it is concluded that stacked parallel connection is used inside the transducer.PA66-GF30 is used as packaging material to design the Cymbal piezoelectric transducer.When the vibration frequency is 15 Hz,the output power of the piezoelectric energy collector reaches the peak when the load resistance is 0.02 MΩ,and the maximum output power is 2662 m W.In addition,the output power presents a unipeak distribution.Its maximum output voltage is finally stable at about 310 V;The circuit becomes open.3.The structure model of asphalt concrete pavement was established,and the electrical output performance was simulated and analyzed after the packaged piezoelectric energy collector was embedded in the pavement.The results showed that the output power of the embedded piezoelectric energy collector was 246 m W and the output voltage was 71 V under the condition that the vibration frequency of pavement structure was 15 Hz.The output power is reduced to it 9.24% and the output voltage is reduced to its 38.8%.