现有的压电俘能器大多是针对某一较窄频率范围内的振动情况而设计,但周围环境的频率范围非常宽泛且随时可能发生变化,导致一般俘能器很难实现能量俘获或俘能效率低,为了解决这一问题,设计了一种新的T型压电悬臂梁作为俘能装置.从结构设计和电路设计2方面出发,进行了静力学分析、模态分析和谐振分析,得出压电结构装置的固有频率和激振力频率等响应,对新型的主动式俘能电路进行设计,计算电路的功率损耗以及元器件损耗量.通过对主动式俘能电路进行计算仿真验证,以及对主动技术和被动技术进行对比分析,得到主动技术所获得的最大功率是被动技术的5倍.由此可知,运用电压控制型主动边界控制方法进行接口电路设计,主动利用每个压电换能周期中触发的电学边界条件,可有效增加输入压电俘能器的机械能,进而增大输出的电能.该研究创新了利用压电材料主动俘能的方式,对压电俘能的发展有积极的促进作用.%Most of the existing piezoelectric traps are designed for a narrow frequency range of vibration,but the surrounding environment has a very wide frequency range,and the frequency may also be subject to change,causing the problem of difficult to achieve energy capture or capture inefficiency.In order to solve problem,a new T-type piezoelectric cantilever is proposed as a capture energy structure in the paper.To begin with the aspects of structural design and circuit design,the static analysis, modal analysis and resonance analysis of the structure are carried out and the natural frequency and excitation frequency of the device are analyzed.The design and calculation of the power consumption and the loss of the components of the circuit are ana-lyzed by the simulation and verification of the active capture energy circuit,and the active and passive techniques are compared and analyzed,the simulation of the active capture circuit is verified by analyzing the power consumption of the circuit and the maximum power obtained by the active technology is 5 times of that of the passive technology.And then the voltage-controlled active boundary control method can be used for interface circuit design,taking the initiative to use each piezoelectric transduc-tion cycle triggered by the electrical boundary conditions to effectively increase the input piezoelectric pump energy,and then increase output power.The way of utilizing the active trapping of piezoelectric materials is innovated,which has a positive effect on the development of piezoelectric traps.
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