Extracting longitudinal waves by utilizing the symmetry of piezoelectric sphere

• Published in: International journal of mechanical sciences Vol. 279; p. 109499
• Main Authors: Wang, Zhi-Yang, Wu, Zhi-Jun, Duan, Guan, Shui, Lang-Quan, Li, Ying-Wei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2024
• Subjects: Body wave; P-wave component extraction; Piezoelectric sensor; Symmetrical structure; Theoretical and numerical validation; Piezoelectric sensor; Body wave; Theoretical and numerical validation; P-wave component extraction; Symmetrical structure
• ISSN: 0020-7403
• DOI: 10.1016/j.ijmecsci.2024.109499

•The transducer was developed by utilizing the symmetry of the spherical structure.•P-wave generates the equivalent electrical potential in both hemispheres.•S-wave engenders opposing electrical potentials in the adjacent quarter sphere.•Numerical simulations and laboratory tests proved the validation of the transducer. Dividing the P- and S- wave components from measured body wave signals is a pivotal yet formidable task for various seismic monitoring devices. In contrast to the commonly employed post processing methods, here, we report a sensor designed to directly extract P-wave signals by filtering out the S-wave component from body waves. The design principle of the sensor capitalizes on the inherent symmetry of a spherical piezoelectric shell and body waves, resulting in the superposition of P-wave excitation charges while concurrently canceling out S-wave excitation charges. The validity of this concept was first confirmed through theoretical analysis and numerical simulations. Laboratory tests further substantiated that the sensor response to P-waves surpasses that to S-waves by two orders of magnitude. The reported sensor sheds sights on the processing of body waves with hardware and validates a new pathway for improving the performance of existing related devices. [Display omitted]