---
res:
bibo_abstract:
- Due to the modal behavior of geometrically bounded media, ultrasonic guided waves
propagate in waveguides as a combination of multiple dispersive wave packets,
which can be simulated as a PDE-problem. Given an excitation in time and space,
multiple eigen-modes derived from solving the PDE may propagate each with different
dispersion characteristics and weight. Considering a broad-band pulse exciting
from one side of a hollow cylindrical waveguide, the received signal at the other
side consists of all propagating eigen-modes that can be considered approximately
as the narrow band signals. The synchrosqueezed wavelet transform (SWT) is employed
to sharpen the time-frequency representation (TFR) of the received waveguide signal.
Using a ridge detection algorithm, we successively separate the synchrosqueezed
TFR into several narrow band TFRs which can be identified as oscillatory components
with time-varying frequency. Then those separated TFRs are reconstructed as narrow
band signals using the inverse SWT. Based on an analytical model of the waveguide,
we observe that the decomposed signals are similar to those dominant eigen-modes
simulated above. Moreover, also the group delay and, therefore, the group velocity
of each decomposed signal can be estimated well. This is of high interest when
analyzing the characteristic of a given waveguide, such as acoustical property
measurements or non-destructive testing.@eng
bibo_authorlist:
- foaf_Person:
foaf_givenName: Fabian
foaf_name: Bause, Fabian
foaf_surname: Bause
- foaf_Person:
foaf_givenName: Boqiang
foaf_name: Huang, Boqiang
foaf_surname: Huang
- foaf_Person:
foaf_givenName: Angela
foaf_name: Kunoth, Angela
foaf_surname: Kunoth
- foaf_Person:
foaf_givenName: Bernd
foaf_name: Henning, Bernd
foaf_surname: Henning
foaf_workInfoHomepage: http://www.librecat.org/personId=213
dct_date: 2013^xs_gYear
dct_language: eng
dct_title: Ultrasonic Waveguide Signal Decomposition Using the Synchrosqueezed Wavelet
Transform for Modal Group Delay Computation@
...