Magnetic and mechanical noise in the frequency range of MHz are available in the environment and could be harvested for human convenience. This manuscript focuses on the dynamical behavior of hybrid magneto-mechano-electric (MME) energy harvesters to convert the energy of the magnetic noise and mechanical noise to electrical power using a composite energy scavenging structure. The proposed apparatus is composed of a piezoelectric (PZT-5A) layered beam on which a magnetostrictive material (Metglas-2605SC) is deposited. Once the device is exposed to external magnetic noise, Metglas-2605SC undergoes mechanical strain, and as a result, the mechanical strain is converted to electrical potential difference throughout the PZT-5A layer. In the present manuscript, the energy harvesting device is modeled as a cantilever beam, and the equations of motion are derived using Newton’s second law. The governing equations of motion, along with the output electrical potential difference equation are then discretized and numerically integrated over time, the frequency response curves for deflection, harvested power, and voltage are determined, and the effect of governing parameters on the output power is investigated. It is concluded that in the absence of mechanical damping, the response resembles that of a damped mass-spring oscillator confirming the energy consumption throughout the output circuit. In addition, as the external load resistance increases up to a particular value (164kΩ), the attenuation rate of the response amplitude, and accordingly, the harvested power also increases. Beyond that particular value, the collected energy decreases by further increasing the load resistance. The results revealed that between two successive natural frequencies, there exists an anti-resonance region, where the response amplitude dramatically drops, and the operating area of the energy harvester needs to be kept well away from this zone in the frequency domain. The analytical results are verified by presenting a finite element simulation of the cantilever energy harvesting model, in which the distribution of stress and harvested voltage are determined.

中文翻译：

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一种新型能量收集器将磁噪声能量转换为电能的动力学

MHz 频率范围内的磁和机械噪声存在于环境中，可以为人类方便而收集。本手稿重点介绍混合磁机电 (MME) 能量收集器的动力学行为，使用复合能量清除结构将磁噪声和机械噪声的能量转换为电能。所提出的装置由压电 (PZT-5A) 层状梁组成，其上沉积了磁致伸缩材料 (Metglas-2605SC)。一旦器件暴露在外部磁噪声中，Metglas-2605SC 就会承受机械应变，因此，机械应变会转化为整个 PZT-5A 层的电位差。在本手稿中，能量收集装置被建模为悬臂梁，运动方程是使用牛顿第二定律推导出来的。然后将运动控制方程以及输出电势差方程离散化并随时间进行数值积分，确定偏转、收集功率和电压的频率响应曲线，并研究控制参数对输出功率的影响. 得出的结论是，在没有机械阻尼的情况下，响应类似于阻尼质量弹簧振荡器的响应，确认了整个输出电路的能量消耗。此外，当外部负载电阻增加到特定值 (164kΩ) 时，响应幅度的衰减率也会增加，因此收集到的功率也会增加。除了那个特殊的价值，通过进一步增加负载电阻，收集到的能量会减少。结果表明，在两个连续的固有频率之间，存在一个反谐振区域，该区域的响应幅度急剧下降，并且能量收集器的工作区域需要在频域中远离该区域。通过提出悬臂能量收集模型的有限元模拟来验证分析结果，其中确定了应力和收集电压的分布。