Determination of the cutoff frequency of an acoustic circumferential wave using a time–frequency analysis

• Published in: NDT & E international : independent nondestructive testing and evaluation Vol. 33; no. 6; pp. 373 - 376
• Main Authors: Latif, R, Aassif, E, Moudden, A, Decultot, D, Faiz, B, Maze, G
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.2000; Elsevier Science
• Subjects: Acoustic response; Aluminium tube; Analysing. Testing. Standards; Applied sciences; Circumferential antisymmetric wave; Exact sciences and technology; Measurement of properties and materials state; Metals. Metallurgy; Nondestructive testing; Reduced cutoff frequency; Time–frequency; Wigner–Ville distribution; Acoustic response; Circumferential antisymmetric wave; Time–frequency; Wigner–Ville distribution; Reduced cutoff frequency; Aluminium tube; Tube; Time frequency domain method; Acoustic signal; Eigenmode; Acoustic wave; Geometrical properties; Aluminium; Physical properties; Wigner-Ville method; Cut off frequency; Non destructive method; Phase velocity; Wave propagation; Group velocity; Pulse response; Wave scattering
• ISSN: 0963-8695; 1879-1174
• DOI: 10.1016/S0963-8695(00)00003-7

In this article, time–frequency representation of Wigner–Ville is used to analyse the acoustic signal backscattered by a thin elastic tube of radii ratio b/ a. This analysis allows to determine the reduced cutoff frequency of the circumferential antisymmetric wave A1 propagating around the tube. The evolution of this reduced cutoff frequency in function of b/ a is reported. The values obtained of reduced cutoff frequency are compared to the values computed from the proper modes method.