The Research On Self-charging Structure Of Vehicle Tires Based On Piezoelectric Materials

As the level of intelligence in cars continues to increase to meet people’s constantly growing demands for performance,comfort,and safety,the number of sensors inside tires is also increasing.However,the existing button battery power supply is no longer sufficient to meet their power needs,making it necessary to establish a tire self-capturing energy system.Although many researchers have proposed capturing energy device structures,the increasing number of sensors inside tires has raised the requirements for their power supply capabilities.This article is based on PVDF piezoelectric films to study the arrangement of piezoelectric materials,piezoelectric sheet specifications,and the effects of tire load and tire pressure on piezoelectric capturing energy to improve the energy capture efficiency of piezoelectric materials placed on the tire wall.The specific research work is as follows:(1)Explain the development of passive tire capturing energy and the structural research of piezoelectric materials at home and abroad.At the same time,analyze the piezoelectric effect and discuss the structure of tire piezoelectric capturing energy based on PVDF piezoelectric films.By establishing a finite element model of the PVDF bending body,analyze the influence of the piezoelectric sheet specifications and curvature radius on the energy capture efficiency.(2)Based on the finite element principle of hyperelastic materials and the characteristics of tire materials,establish a finite element model of the tire to study the deformation of the tire under different tire pressures and loads,and analyze the optimal capturing energy position of the piezoelectric material in the tire.(3)By analyzing the parameters that affect the efficiency of piezoelectric capturing energy,establish a rolling and piezoelectric coupling model of the tire.Through this model,obtain the voltage curve output by the piezoelectric material as the tire rolls,further verifying the analysis of the optimal capturing energy position of the piezoelectric material in the tire.(4)Place PVDF on the outside of the tire and conduct rolling experiments.By attaching PVDF piezoelectric material films of different specifications,thicknesses,and quantities to the tire,measure the output voltage of the piezoelectric material under different tire pressures and driving speeds.The simulation and experimental results show that when using piezoelectric materials for energy capture,thickness,length,and curvature radius of the piezoelectric material are the main factors affecting the voltage size.Placing the piezoelectric material on the tire sidewall can achieve the highest energy capture efficiency of the piezoelectric material.For tire state factors,the higher the tire pressure,the worse the capturing energy effect,and the lower the tire pressure,the better the capturing energy effect;at the same time,the larger the load,the better the capturing energy effect.The experiment further studied the effects of tire driving speed and the number of piezoelectric material arrangements on capturing energy effect.The results show that the faster the vehicle driving speed,the better the capturing energy effect;at the same time,increasing thickness and arrangement quantity can improve the capturing energy effect.In addition,the length of the piezoelectric material has a greater influence on the energy capture efficiency than the width.