Structural Design And Performance Analysis Of Piezoelectric Tire Force Sensor

As the main device for measuring vehicle dynamics parameters,the tire force sensor measures the relevant dynamic loads during vehicle travel in real time and monitors the state of wheel motion.The dynamics and stability analysis of the vehicle through its measurement data can help improve the smoothness of vehicle motion and the comfort of ride.Therefore,this paper addresses the layout method,measurement principle,structural design,structural optimization and performance analysis of the force-sensitive element of the tire force sensor,which is mainly as follows:Firstly,the piezoelectric tire force sensor is combined with the actual working conditions,and the quartz wafer with excellent dynamic measurement performance is selected as the force sensitive element,and its shape and size are determined.The quartz wafers of the same cut type are connected in parallel to make a unit crystal set,and then the unit crystal sets of different cut types are combined by stacking to make a corresponding quartz crystal set according to the demand of force/torque measurement,and the spatial layout of the quartz crystal set and the measurement principle of the tire force sensor are studied.Secondly,the design requirements are combined with the functional requirements of the tire force sensor,and the design of the main structure of the eight-beam tire force sensor is completed with the eight-point layout principle.According to the different ways of quartz crystal set mounting,two solutions of vertical mounting type and horizontal mounting type are designed,and the corresponding quartz crystal set mounting box is designed respectively to facilitate the installation of quartz crystal set.Based on this,the performance of both is compared and analyzed by finite element analysis.Then,the comprehensive performance index is proposed as a parameter index to measure the performance of the piezoelectric tire force sensor,and it is used as the optimization objective.The optimal distribution of materials in the tire force sensor structure under different loads is obtained by using topology optimization,the optimal boundary shape of the tire force sensor is obtained by using shape optimization,the dimensional parameters that have a large impact on the performance are screened out by using parameter correlation analysis and control variable method,and the main dimensional parameters are optimized by using a combination of response surface and finite element analysis to complete the structural optimization design of the piezoelectric tire force sensor.On this basis,the connection method and signal integration module of the tire force sensor and the wheel system are designed.Finally,the load transfer process of the piezoelectric tire force sensor is analyzed and a mechanical model is established.The performance is studied by mechanical performance simulation analysis,the actual intrinsic frequency of the tire force sensor is derived by kinetic simulation analysis,the reasonableness of the tire force sensor range is evaluated by ultimate load simulation test,and the mechanical transfer efficiency of the tire force sensor is calculated by the simulation results of mechanical performance.The research in this paper provides a theoretical basis for the pre-structural design and mechanical performance analysis of piezoelectric tire force sensors,shortens the design cycle of piezoelectric tire force sensors,and has important engineering practical significance.