Potential benefits of a non-linear stiffness in an energy harvesting device
Potential benefits of a non-linear stiffness in an energy harvesting device
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DOI：
10.1007/s11071-009-9561-5
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发表时间：
2010-03-01
影响因子：
5.6
通讯作者：
Kovacic, I.
中科院分区：
文献类型：
--
作者：
Ramlan, R.;Brennan, M. J.;Kovacic, I.
研究了在包括质量-弹簧-阻尼器系统的能量收集装置中使用非线性刚度的益处。基于能量守恒原理的分析揭示了任何非线性装置在这种应用中的调谐线性装置的有效性的基本限制。两种类型的非线性刚度。第一系统具有非线性双稳态快速通过机构。该机制具有使质量的位移响应作为时间的函数变陡的效果，从而导致对于给定输入激励的更高速度。数值结果表明，当激励频率远小于固有频率时，该机构可以获得更多的功率。研究的另一个非线性系统具有硬化弹簧，其具有改变共振频率的效果。数值和分析研究表明，具有硬化弹簧的设备具有更大的带宽，由于谐振频率的偏移，可以在该带宽上收获功率。
The benefits of using a non-linear stiffness in an energy harvesting device comprising a mass-spring-damper system are investigated. Analysis based on the principle of conservation of energy reveals a fundamental limit of the effectiveness of any non-linear device over a tuned linear device for such an application. Two types of non-linear stiffness are considered. The first system has a non-linear bi-stable snap-through mechanism. This mechanism has the effect of steepening the displacement response of the mass as a function of time, resulting in a higher velocity for a given input excitation. Numerical results show that more power is harvested by the mechanism if the excitation frequency is much less than the natural frequency. The other non-linear system studied has a hardening spring, which has the effect of shifting the resonance frequency. Numerical and analytical studies show that the device with a hardening spring has a larger bandwidth over which the power can be harvested due to the shift in the resonance frequency.