Simulation And Experimental Study On Piezoelectric Energy-fed Shock Absorber Of Automobile

At present,energy recovery and utilization has become one of the research focuses of scholars all over the world.Piezoelectric elements can convert vibration energy into electrical energy and are used in many fields,such as natural energy power generation,mechanical vibration power generation,human organ power generation and so on.Hydraulic shock absorber is the most widely used damping element in automobile suspension system.Its function is to absorb and dissipate the vibration energy of vehicle body when the vehicle is driving on uneven road.In this paper,a new type of piezoelectric energy fed hydraulic shock absorber is developed by combining piezoelectric ceramics with double cylinder hydraulic shock absorber.The shock absorber can convert the vibration energy of vehicle body into electric energy for recycling.The main contents of this paper are as follows :(1)Analyzing the working principle of piezoelectric energy-feed shock absorber,determining the structure form of piezoelectric oscillator,deducing the expression of voltage and electric energy,and introducing the basic theory of mathematical modeling of piezoelectric energy-feed shock absorber.(2)Through the modal analysis and static analysis of the selected piezoelectric vibrator by the simulation software,the influence of the structural parameters of the ring piezoelectric vibrator on its deformation is discussed,and the structural parameters of the ring piezoelectric vibrator are determined;the harmonic response analysis and random vibration analysis of the piezoelectric vibrator are carried out,and the ultimate output power of the piezoelectric vibrator is calculated.(3)The fluent two-dimensional mathematical model of the energy fed shock absorber is established;the flow field distribution in the energy fed shock absorber is explored,and the vibration reduction characteristics of the energy fed shock absorber are verified.(4)Combined with the above model,the influence of piston rod motion type,constant through hole size,bottom valve diameter,oil viscosity and temperature characteristics,and the parameters of gas filling into the compensation chamber on the energy feeding characteristics of the energy feeding damper are studied by using Matlab/ Simulink simulation software.(5)A hardware in the loop simulation test-bed is built to explore the influence of amplitude and frequency of sinusoidal excitation and power spectral density of different road grades on the energy capture characteristics of piezoelectric vibrator,and the simulation results are compared to verify the feasibility of vibration energy recovery by energy fed damper.The simulation results show that: the voltage value of the energy fed hydraulic damper increases with the increase of the amplitude and frequency of sinusoidal excitation;increases with the increase of the road roughness coefficient;decreases with the increase of the diameter of the constant through hole and the overflow diameter of the bottom valve;decreases with the increase of the ambient temperature;the type of gas has little effect on the energy capture characteristics of the energy fed hydraulic damper.The experimental results show that the voltage value generated by the piezoelectric vibrator increases with the increase of sinusoidal excitation frequency and amplitude,and increases with the increase of road displacement power spectral density.The experimental results are consistent with the simulation results,which verifies the feasibility of the energy feedback damper for vibration energy recovery.There are 50 pictures,5 tables and 55 references.