Clusters of Shaped Ultrasonic Transducers for Lamb Waves’ DoA Estimation

Applied Sciences

Marco Dibiase¹  LucaDe Marchi² 

[1] Department of Computer Science and Engineering, University of Bologna, 40136 Bologna, Italy;Department of Electrical, Electronic, and Information Engineering “Guglielmo Marconi”, University of Bologna, 40136 Bologna, Italy;

关键词: direction of arrival estimation;    Acoustic source location;    piezoelectric sensors;    shaped sensors;    Lamb waves;    Radon transform;   

DOI  :  10.3390/app10228150

来源: DOAJ

【 摘 要 】

The direction of arrival (DoA) estimation of Lamb waves is a fundamental task to locate acoustic events, such as those caused by impacts in plates or shells. To perform this task, a novel cluster of piezoelectric sensors is presented in this work. The designed cluster is composed by three irregularly shaped patch transducers (P1, P2 e P3). This is in contrast with the approaches that are typically presented in literature which are based on isotropic piezo-disks. In our approach, the transducers are shaped with a procedure based on the Radon Transform, so that the difference in time of arrival (DToA) of the Lamb waves at patches P1 and P2 is linearly related to the DoA, while P3 is designed so that it is possible to perform the estimation of DoA without knowing the actual wave velocity. The numerical validation shows that the performance in the DoA estimation achieved by means of the proposed cluster compares favorably with respect to clusters of conventional sensors, even in the case of noise-affected measurements.

【 授权许可】

Unknown