School of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea.
Agency for Defense Development, Changwon 51678, Korea.
Sensors (Basel). 2021 Sep 12;21(18):6119. doi: 10.3390/s21186119.
Cymbal transducers are frequently used as an array rather than a single element because of their high quality factor and low energy conversion efficiency. When used as an array, cymbal transducers are likely to have a big change in their frequency characteristics due to the interaction with neighboring elements. In this study, we designed an array pattern of cymbal transducers to achieve a wide frequency bandwidth using this property. First, cymbal transducers with specific center frequencies were designed. Next, a 2 × 2 planar array was constructed with the designed transducers, where dielectric polarity directions of the transducers were divided into two cases (i.e., same and different). For the array, the effect of the difference in the center frequencies and the spacing between the transducers on the acoustic characteristics of the entire array was analyzed. Based on the results, the structural pattern of the array was optimized to have the maximum fractional bandwidth while maintaining the transmitting voltage response over a given requirement. The design validity was verified by making cymbal array prototypes, followed by measuring their performances and comparing them with that of the design.
音叉换能器因其高品质因数和低能量转换效率，常被用作阵列而不是单个元件。当用作阵列时，由于与相邻元件的相互作用，音叉换能器的频率特性可能会发生很大变化。在这项研究中，我们利用这一特性设计了一种音叉换能器的阵列模式，以实现宽频带。首先，设计了具有特定中心频率的音叉换能器。接下来，用设计的换能器构建了一个 2×2 的平面阵列，其中换能器的介电极性方向分为两种情况（即相同和不同）。对于该阵列，分析了换能器中心频率和间隔的差异对整个阵列声学特性的影响。基于结果，优化了阵列的结构模式，以在满足给定要求的情况下，最大限度地提高分数带宽，同时保持传输电压响应。通过制作音叉阵列原型验证了设计的有效性，然后测量了它们的性能并与设计进行了比较。
