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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Piezoelectric Resonance Shifting Using Tunable Nonlinear Stiffness
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Piezoelectric Resonance Shifting Using Tunable Nonlinear Stiffness

机译：可调非线性刚度的压电谐振位移

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摘要

Piezoelectric cantilever devices for energy harvesting purposes have typically been tuned by manipulating beam dimensions or by placement of a tip mass. While these techniques do lend themselves well to designing a highly tuned resonance, the design is fixed and causes each system to be unique to a specific driving frequency. In this work, we demonstrate the design of a nonlinear tuning technique via a variable external, attractive magnetic force. With this design, the resonance of the piezoelectric energy harvester is able to be tuned with the adjustment of a slider mechanism. The magnetic design uses the well of attraction principle in order to create a varying nonlinear stiffness, which shifts the resonance of the coupled piezoelectric beam. The significance of this work is the design of a piezoelectric energy harvesting system with a variable resonance frequency that can be adjusted for changes in the driving frequencies over a wide range without the replacement of any system components; thus, extending the usefulness of these vibration energy harvesting devices over a larger frequency span.
机译：用于能量收集目的的压电悬臂装置通常已通过操纵光束尺寸或通过放置尖端质量进行了调整。虽然这些技术确实可以很好地设计出高度调谐的谐振，但是该设计是固定的，并使每个系统对于特定的驱动频率都是唯一的。在这项工作中，我们通过可变的外部吸引力来演示非线性调整技术的设计。通过这种设计，压电能量采集器的共振能够通过调节滑块机构来调节。磁性设计使用吸引阱原理，以创建变化的非线性刚度，从而改变耦合压电梁的共振。这项工作的意义在于设计一种具有可变谐振频率的压电能量收集系统，该系统可以在不更换任何系统组件的情况下针对很大范围内的驱动频率变化进行调整；因此，将这些振动能量收集装置的实用性扩展到更大的频率范围。

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