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The effect of frequency detuning and seismic energy scavenging on the host structure and harvesting performance under broadband excitation

机译:宽带激励下频率失谐和地震能量清除对宿主结构和采集性能的影响

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In this work, the effect of seismic energy harvesting on the host structure and the harvesting performance will be discussed under broadband excitation with a view to exploring a more practical case. This work focuses on the harvester design for a fixed host structure under broadband force excitation. The modeling of the whole system is based on stochastic theory and the system performance is discussed with numerical calculations using this stochastic modeling. In addition to analysis on the coupling between the host structure and the harvester, the effect of frequency detuning between the harvester and host structure resonant frequencies is also presented. Two design criteria (constant force factor and constant electromechanical coupling factor) are proposed to show different energy conversion processes. In both cases, the optimal harvested powers are found when the resonant frequency of the harvester is perfectly matched with the resonant frequency of the host structure. With a constant force factor, the harvester performance is very sensitive to the frequency detuning effect. With a constant electromechanical coupling factor, however, there is very little variation in the harvested power when the two resonant frequencies are detuned.
机译:在这项工作中,将在宽带激励下讨论地震能量收集对主体结构和收集性能的影响,以探索更实际的情况。这项工作的重点是在宽带力激励下针对固定主体结构的收割机设计。整个系统的建模基于随机理论,并使用该随机模型通过数值计算来讨论系统性能。除了分析主机结构和收割机之间的耦合之外,还介绍了收割机和主机结构共振频率之间的频率失谐效应。提出了两个设计标准(恒定力因数和恒定机电耦合因数)来显示不同的能量转换过程。在这两种情况下,当收割机的共振频率与主体结构的共振频率完全匹配时,便可以找到最佳的收割功率。在恒定的力因数下,收割机的性能对频率失谐效果非常敏感。但是,在恒定的机电耦合系数下,当两个谐振频率失谐时,收获的功率几乎没有变化。

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