Dynamic Characteristics Of A Bistable Piezoelectric Cantilever Generator

In the past few years,the development of piezoelectric power generation technology,using the vibration energy in the environment to power the system has become a hot spot in currentdynamics research.Piezoelectric power generation devices are the focus of scholars research,in order to make the system get better power generation effects.In this paper,a nonlinear spring is combined with a traditional bistable piezoelectric energy capture system,and a bistable piezoelectric vibration energy-capturing device with nonlinear spring is proposed,which makes it easier for the system to reduce the barrier and make large-scale periodic motion.To achieve a better kinetic output response.In this paper,the MATLAB numerical simulation method is used to study the dynamic response characteristics of the system and the variation of various structural parameters on the output response characteristics of the system.The experimental results are used to verify the system output response characteristics such as excitation amplitude,excitation frequency,magnetic beam spacing and damping impact.The design and practical application of the bistable piezoelectric power generation device have scientific significance.The main research contents are as follows:(1)The mathematical geometry model of the bistable piezoelectric power generation system with nonlinear spring is established.The dynamic control equations of the system are obtained by Hamiltonian principle,Galerkin method and Taylor series expansion.The kinetic output response of the system with excitation intensity,excitation frequency,magnetic beam spacing,magnetic moment and damping changes under harmonic excitation,and the above parameters are obtained for the bistable piezoelectric vibration energy capture device with nonlinear spring.The law of variation of the vibration situation.At the same time,compared cases,the dynamic brush response of bistable systems with nonlinear springs is higher than that of bistable piezoelectric systems with linear springs.The dynamic governing equations of the piezoelectric system are established and solved numerically under the excitation of narrow band random noise signal.The effects of noise intensity and frequency,magnetic beam spacing,initial value,magnetic moment,random perturbation term,and nonlinear spring stiffness on the dynamic response and power characteristics of the system were studied with other parameters unchanged.The response characteristics of each parameter to the system under narrow-band random excitation and simple harmonic excitation were verified and analyzed by self-designed experiments,and the parameter range ranges of the magnetic beam spacing,nonlinear spring stiffness and the initial value that produced a large motion range to the system were obtained.Through the above research,the dynamic characteristics of the bistable piezoelectric power generation system with nonlinear spring are obtained,and the research results provide more theoretical basis for the in-depth study of the nonlinear bistable piezoelectric vibration energy capture device.