Research On Stiffness And Damping Of Piezoelectric Energy-regenerative Suspension Piezoelectric Mechanism

Continuously and rapidly development of auto industry, stimulating economic growthwhile also aggravated the energy shortage and environmental pollution. A new type ofpiezoelectric energy-regenerative suspension is put forward in this thesis, this systembased on the piezoelectric effect, it can regenerate utilization the vehicle vibration energyfrom the road excitation and transform it into electric energy. Through multidisciplinarypartnerships, a mathematical model of piezoelectric regenerative suspension wasestablished, then analyze the main factors that influence stiffness and damping. The mainresearch contents are as follow:Derive free vibration differential equation of continuous system using the structuralvibration theory. Numerical value result of the inherent frequency and main vibrationmode of piezoelectric cantilever and piezoelectric simple supported cantilever wereanalyzed, by using the finite element software of ANSYS, model result of two kinds ofbimorph cantilever are analyzed. Derive differential equation of continuous system withdamping forced vibration; analyze its transverse displacement of the steady-state response.According to the material mechanics knowledge, derive relation between equivalentstiffness and strain energy of piezoelectric cantilever. A mathematical model of equivalentstiffness of piezoelectric mechanism was established, the main factors that influenceequivalent stiffness of this mechanism was analyzed. The model of machine electricitytransformation of piezoelectric bimorph simple supported cantilever was established. Theeffects of structural and dimension parameters of the piezoelectric cantilever on energygeneration were analyzed. Explore energy dissipative processes and generationmechanism of damping of piezoelectric mechanism, the mathematical model wasestablished and analyzed that the equivalent stiffness of piezoelectric mechanism.The mathematical model of the piezoelectric McPherson energy-regenerativesuspension was built by the kiematic theory of space mechanism, and then combined withsimulation software ADAMS to establish the kinematic simulation analysis model. Themathematical model of energy-regenerative suspension based on force analysis, stiffness and damping calculation were established, then analyze the influence of piezoelectricmechanism of stiffness and damping on suspension system.