Design And Vibration Analysis Of A Multi-parameter Detector For Tire Pressure And Rotational Speed

Sensor technology has developed rapidly since this century.Sensors are widely used in scientific research such as cosmic exploration,deep-sea exploration,deepseismic exploration,Medical equipment,transportation tools,smart life and other fields.Piezoelectric sensors can convert mechanical energy into electrical energy,so energy conversion can be realized with low energy consumption and structure is simple.At present,the research on piezoelectric effect materials applied to tire pressure sensors is mainly focused on the research of Power Generation Capacity of Piezoelectric Cantilever.Most of the work considering piezoelectric materials as power supply components,there are few studies on the use of piezoelectric pressure sensors as sensing elements.There is less research on multi-parametric sensors that can be used for speed measurement and tire pressure monitoring.Magnetic force can realize non-contact transfer load.This paper proposes a piezoelectric multi-parameter tire pressure sensor based on a cantilever beam structure for the above problems.The sensor can realize a structural measurement of two parameters.The main work of this paper is to design the structure of the sensor.The output sensitivity of the sensor is studied through experiment.The sensor acceleration interference removal method is proposed and the effectiveness is verified.First,a piezoelectric multi-parameter tire pressure and rotational speed sensor based on cantilever structure was designed.A magnetic block is attached to one end of the sensor cantilever beam,and another magnetic block is installed in the corresponding position of the tire.The magnetic load is transmitted between the magnetic blocks,and the external load is applied to the cantilever beam to generate strain,and the piezoelectric material generates charge due to strain.The mathematical model of the output of the sensor is established using the piezoelectric equation and the Euler Bernoulli beam theory.The magnetic force between the magnetic blocks was calculated according to the finite element method,and the relationship between the magnetic force and the X distance was deduced.Then we use simulation software,the static simulation of the piezoelectric multi-parameter sensor is performed to verify the relationship between the sensor output and the input external force,and the allowable load is determined according to the material strength.According to the output characteristics and natural vibration,the geometric parameters of the cantilever beam are optimized through simulation.Using simulation to simulate the frequency spectrum of the sensor.Obtained first-order natural frequency has the greatest effect on operating frequency.Therefore,according to simulation results,the geometric parameters of the sensor are determined.Finally,a sensor experiment platform was designed and built.A sensor experimental platform was designed and built,a tire pressure rotation speed simulation device was designed,and a sensor test circuit was designed.The static test was conducted,the relationship between the deflection of the sensor's cantilever beam and the external force was calibrated,and the relationship between the X-feed of the tire pressure simulation device and the deflection of the cantilever beam was calibrated,and the relationship between the magnetic force and X was derived.The experiment has tested and obtained the frequency spectrum of the sensor to obtain the first-order characteristic frequency of natural vibration of the sensor.By separately adjusting the X-feed of the tire simulating device at different rotational speeds,the sensor output sensitivity under the change of tire pressure at different rotational speeds is obtained.Test sensor speed parameter detection.The tire pressure and speed parameters under the influence of acceleration are designed to affect the experiment and how to eliminate the influence of acceleration.In summary,this paper studies the method of multiple parameters of sensors,and conducts initial research on sensors from the aspects of working principle,structure design,simulation analysis,and experimental testing of piezoelectric multi-parameter sensors.