Study On Vibration Energy Recovery Of Vortex Street Based On Macpherson Suspension Damper

In this paper,the application scheme of wind-induced vibration piezoelectric energy recovery system in vehicles is proposed.The model of angular vibration McPherson suspension,flow field analysis of vibrating cylinder,energy recovery of double-layer piezoelectric cantilever beam,energy recovery circuit design are studied.In this paper,the wind-induced vibration energy recovery system of the damper is studied,and the main research contents and results was as follows:1.A 2-D Cartesian coordinate system is established for the structural and kinematic characteristics of the MacPherson suspension system.In addition,the motion characteristics of the MacPherson suspension are analyzed,and the simulation model is established in the MATLAB/Simulink environment.By comparing with the traditional suspension model,the results of the new MacPherson suspension angular vibration model are basically the same,then the new McPherson The suspension angle vibration model is trustworthy.2.According to the Euler-Bernoulli cantilever theory and the constitutive equation of piezoelectric materials,the relationship between the output voltage and current of the vibrator generated by the double-layer cantilever beam with intermediate interlayer and structural parameters is derived.The effects of parameters such as air flow rate,damper diameter,lateral vibration frequency and amplitude on the dynamic characteristics of the vortex are analyzed.The results showed that the de-vortex frequency has a quadratic relationship with the reciprocal of the damper diameter,while the lateral vibration frequency plays a key role in the dynamic de-vortex frequency,and has a significant influence on the pressure distribution of the flow field.The lateral amplitude vs.the boundary-free flow field The lateral distribution of the pressure field under the condition has a great influence.3.Based on the Euler Bernoulli cantilever beam theory and the constitutive equation of piezoelectric materials,the relationship between the Output voltage of oscillator with three layer cantilever beam with intermediate sandwich and the structural parameters is derived.Combined with the two-dimensional flow field model,the maximum position of the wake pressure change after static cylinder flow is calculated under different flow rates.The pressure change curves and the relationship between the maximum pressure change rate and the flow velocity are also calculated.By comparing with experiment,we found that there is a big gap between experiment and theory.4.The output voltage formula of piezoelectric cantilever beam under vibration environment is derived,and the piezoelectric energy recovery process of four classical piezoelectric energy recovery circuits is analyzed.The piezoelectric recovery power of these four piezoelectric energy recovery circuits in the case of a constant exciting force is calculated.Finally,the standard circuit is selected as the energy recovery circuit of this paper and the characteristics of the standard piezoelectric energy recovery circuit are analyzed by the circuit simulation software.And the analysis of the filter capacitor in the circuit shows that the filter capacitor has no effect on the recovered power of the standard energy recovery circuit,but the external load has a great influence on the piezoelectric recovery power of the circuit.As the resistance value of the external load increases,the piezoelectric recovery power is increased first and then decreased.5.The data acquisition system was designed to collect data from the experiment and perform piezoelectric energy recovery experiments.The results show that the maximum output power of the cantilever beam is 173?W.