Acoustic Source Localisation Using Distributed Sensing. (2017)

• Record Type: Journal Article
• Authors: Rosalie, Cedric; Rajic, Nik; Norman, Patrick; Davis, Claire
• Is Part Of: Procedia engineering. Volume 188(2017)
• Page Start: 499
• Page End: 507
• Publication Date: 2017
• Subjects: acousto-ultrasonics -- distributed sensing -- filtering -- finite element modelling -- Lamb waves -- laser vibrometry -- structural health monitoring; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2017.04.514
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: The actuation of Lamb waves in thin plate-like structures and subsequent interpretation of the scattered wave field offers a capability for broad area damage detection and location. In practice, interpretation of a scattered field can be difficult when there are several overlapping wave modes propagating which is a realistic scenario for many applications. This paper reports on the use of spatially distributed in situ measurements to decompose a wave-field into its constituent modes. A pass-band filter is applied to the complex spectrum of the wave-field and an inverse transform then applied to affect a complete time-domain separation of the constituent modes. Knowledge of the group velocity and time-of-flight for each mode allows the distance of the sensor from the source to be accurately determined while the pass-band filtered spectrum enables a determination of the relative orientation between the source and the sensor via the application of a corrective angle. The method is validated numerically and experimentally.