Mode couplings in multiplex electromechanical structures
Mode couplings in multiplex electromechanical structures
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DOI：
10.1063/5.0103146
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发表时间：
2022-09
影响因子：
3.2
通讯作者：
Moustafa Sayed Ahmed;M. Ghommem;S. Shahab
中科院分区：
文献类型：
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作者：
Moustafa Sayed Ahmed;M. Ghommem;S. Shahab
与弹性波在三维复合结构中传播有关的模式耦合，表现为不对称的本征模式和耗散，决定了机电结构的效率。因此，在考虑材料损耗的同时，预测电弹性对称模式(如厚度扩张器和径向模式)以及非对称弯曲模式是至关重要的。多路机电结构包括多层透壁超声功率传输(TWUPT)系统。支持TWUPT的物理过程包括在发射/声源元件处的振动、通过屏障和耦合层的弹性波传播、在接收元件处的弹性振动的压电转换以及发射和接收元件的空间共振。我们研究了优化的模式TWUPT系统中的模式耦合，包括它们的物理起源，描述它们的模型，以及弱耦合和强耦合的状态。系统布局优化是根据尺寸(体积)、工作频率和匹配电路负载优化来定义的。开发了一个计算模型，并将其与实验模态特征相结合，以突出本征模特征对优化结果的影响。对几种行为模式进行了识别和分析。对称的径向模式和不对称的弯曲模式相互作用，导致系统的阻尼增加，器件的整体效率降低。机电耦合因子值也同样因此而减小。这种现象可以用模式之间相互作用时的能量流动来解释。本工作还提出了基于利用固有物理现象来提高TWUPT系统性能的设计指南。
Mode couplings associated with elastic wave propagation through three-dimensional multiplex structures, as manifested by asymmetric eigenmodes and dissipation, determine the efficiency of electromechanical structures. As a result, it is critical to predict electroelastic symmetric modes such as thickness expander and radial modes, as well as asymmetric flexural modes, while accounting for material losses. Multiplex electromechanical structures include multi-layered through-wall ultrasound power transfer (TWUPT) systems. Physical processes that support TWUPT include vibrations at a transmitting/acoustic source element, elastic wave propagation through a barrier and coupling layers, piezoelectric transduction of elastic vibrations at a receiving element, and spatial resonances of the transmitting and receiving elements. We investigate mode couplings in an optimized modal TWUPT system, including their physical origins, models used to describe them, and regimes of weak and strong couplings. The system layout optimization is defined in terms of size (volume), operating frequency, and matching circuit load optimization. A computational model is developed and utilized in conjunction with experimental modal characterization to highlight the impact of eigenmode features on optimization results. Several behavioral modes are identified and analyzed. The interaction of symmetric radial and asymmetric flexural modes causes the system damping to increase and the device's overall efficiency to decrease. The electromechanical coupling factor value is likewise reduced as a result of this. Such occurrences are explained by the flow of energy between modes as they interact. The present work also proposes design guidelines to improve the performance of TWUPT systems based on exploiting inherent physical phenomena.