Response Characteristics And Experimental Study Of Bi-stable Multi-cantilever Piezoelectric Energy Capture System

The environmental micro-energy collection technology provides a solution for the fast development of low power wireless sensor power supply problems.among them,the bistable piezoelectric vibration capture system has been paid much attention because of its ability to obtain high capture efficiency within a wide range of low frequencies.at present,the research on bistable piezoelectric vibration capture energy system is still in its infancy,and there are still many problems to be studied.in this paper,in order to bistable piezoelectric vibration system as the research object,by means of structural design,dynamic theoretical modeling?numerical calculation and experimental analysis,study the dynamic response characteristics and generating performance of the system,as the design of the wide-band captive energy lay the foundation.The paper aiming at the problem of narrow resonance frequency band?difficulty in matching the vibration broadband characteristics of the environment and the low efficiency of capture of traditional linear piezoelectric energy capture device,fusion of nonlinear dynamics and multi-field coupled structure technology,put forward a new bistable piezoelectric vibration capture energy system.established the system dynamics model of consider magnetic field and structural nonlinear characteristics,analysis of the bistable and dynamic response characteristics,revealed nonlinear parameters and external vibration excitation conditions influence law of system power generation performance?Through analysis vibration characteristics of coal mining machine in coal mine,proposed the design requirements of the structure parameters of piezoelectric energy capture device.analyzed the resonant frequency of captured energy by numerical method,obtained the influence of the piezoelectric energy capture device based on the optimal set energy efficiency.Finally,in order to test and evaluate the frequency band broadening capability and power generation performance of bistable piezoelectric vibration capture system,made a test prototype and built a performance testing platform.The experimental results show that:The output voltage of the new bistable piezoelectric vibration capture energy system can reach 18 volt,which is 3.5 times of the linear piezoelectric vibration capture system,the effective working band is 3.1 times of the linear piezoelectric vibration capture system.It is shown that the new bistable piezoelectric capture energy system has the ability to expand the effective working frequency band and improve the power generation efficiency.the research of this paper provides a theoretical basis for the design and application of the broadband belt of the bistable piezoelectric vibrator,which is of certain reference value for the design and application of the wideband band.