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中文摘要：
为了解决压电振子在低频振动环境中俘能效率低下的问题,提出一种变刚度升频结构,变刚度结构可以增大压电振子在微弱信号下的响应振幅来俘获更大的能量。首先设计振动发电电池结构,并此建立整个系统的AMESim振动仿真模型,然后确定变刚度弹簧的刚度曲线及相应仿真参数并进行仿真。仿真结果表明：相对于定刚度升频系统,变刚度升频振动发电机响应频带拓宽15%,发电功率峰值可达7 mW。
英文摘要：
A piezoelectric frequency increased structure with variable stiffness for harvesting low-frequency vibrations was presented. The electromechanical transducer is clamped with variable stiffness spring in order to amplify the amplitude of the piezoelectric ceramic, and then to gain maximum power output. After establishing an AMESim simulation model, a stiffness graph was designed for variable stiffness spring and the related simulation parameters were presented. The frequen- cy range of this modified vibration harvester improved 15% for the generator with constant stiffness springs. The device gen- erated a peak power of 7 mW.
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