Electrode pattern definition in ultrasound power transfer systems
Electrode pattern definition in ultrasound power transfer systems
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DOI：
10.1063/5.0139866
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发表时间：
2023-03
影响因子：
4
通讯作者：
Moustafa Sayed Ahmed;S. Shahab
中科院分区：
文献类型：
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作者：
Moustafa Sayed Ahmed;S. Shahab
我们在压电电极上使用高图案保真度技术，以选择性地激发高阶振动模式，同时隔离其他模式，在多层透壁超声功率传输（TWUPT）系统中。物理机制，例如在发送和接收压电元件处的直接和反向压电效应，以及穿过弹性屏障和耦合层的波传播，都有助于TWUPT。TWUPT系统中的高阶径向模式具有应变节点，其中动态应变分布在圆盘半径方向上改变符号。本研究从理论上和经验上解释了如何用连续电极覆盖振动模式的应变节点导致电输出的实质性抵消。对应变节点位置的预测进行了详细的分析。用于创建发射器和接收器形状的电极图案化由不发生局部力和电荷消除的区域确定，即，两个模态主应力分量具有相同的符号。用于创建电极形状的图案化通过由实验支持的高保真度数值建模来执行。TWUPT系统的独特性质使得在发射侧使用差分激励，同时在各种振动模式下在接收侧监测发射功率和效率成为可能。由于系统质量和功率因数的改善，确定采用所提出的电极图案设计提高了整体器件效率和有功功率。其他模式的抑制构成了与所考虑的模式处的增强配对的滤波器特征。
We use a high pattern-fidelity technique on piezoelectric electrodes to selectively excite high-order vibration modes, while isolating other modes, in multi-layered through-wall ultrasound power transfer (TWUPT) systems. Physical mechanisms, such as direct and inverse piezoelectric effects at transmitting and receiving piezoelectric elements, as well as wave propagation across an elastic barrier and coupling layers, all contribute to TWUPT. High-order radial modes in a TWUPT system feature strain nodes, where the dynamic strain distribution changes sign in the direction of disks' radii. This study explains theoretically and empirically how covering the strain nodes of vibration modes with continuous electrodes results in substantial cancelations of the electrical outputs. A detailed analysis is given for predicting the locations of the strain nodes. The electrode patterning for creating the transmitter and receiver shapes is determined by the regions where local force and charge cancelation do not occur, i.e., the two modal principal stress components have the same sign. Patterning for creating the electrode shapes is performed by high-fidelity numerical modeling supported by experiments. Using differential excitation on the transmitter side while monitoring transmitted power and efficiency on the reception side at various vibration modes is made possible by the unique nature of TWUPT systems. Due to an improvement in system quality and power factors, it is determined that employing the proposed electrode pattern designs enhances overall device efficiency and active power. The suppression of other modes makes up a filter feature that is paired with the enhancement at the mode under consideration.