Zhang J, Hladky-Hennion A C, Hughes W J, Newnham R E
Materials Research Laboratory, The Pennsylvania State University, University Park 16802, USA.
Ultrasonics. 2001 Mar;39(2):91-5. doi: 10.1016/s0041-624x(00)00055-x.
The "double-driver" cymbal, a directional class V flextensional transducer, is described in this paper. Its basic structure is a bilaminar piezoelectric disk with metal caps as mechanical transformers and amplifiers. The directivity was accomplished by exciting the double-driver in a combined flexural and bending mode causing the sound pressure to add in one direction and cancel in the opposite direction. The cardioid beam pattern predicted by finite element modeling agreed well with the experimental measurements. A 3 x 3 double-driver array was constructed to demonstrate that under optimal conditions the array can provide a directional beam pattern with a front-to-back ratio of more than 20 dB.
本文介绍了一种“双驱动”钹形换能器，它是一种定向V类弯曲延伸型换能器。其基本结构是一个双层压电盘，带有金属帽作为机械变压器和放大器。通过以弯曲和弯折组合模式激励双驱动来实现方向性，使得声压在一个方向相加而在相反方向抵消。有限元建模预测的心形波束图案与实验测量结果吻合良好。构建了一个3×3双驱动阵列，以证明在最佳条件下，该阵列可以提供前后比超过20 dB的定向波束图案。
