scholarly journals On Time-Domain Model-Based Ultrasonic Array Imaging

2007 ◽  
Vol 54 (8) ◽  
pp. 1623-1633 ◽  
Author(s):  
F. Lingvall ◽  
T. Olofsson
Keyword(s):  
Time Domain ◽  
Domain Model ◽  
Model Based ◽  
Ultrasonic Array ◽  
Array Imaging

scholarly journals Comparison of Time Domain and Frequency-Wavenumber Domain Ultrasonic Array Imaging Algorithms for Non-Destructive Evaluation

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4951 ◽  
Author(s):  
Zeyu Zhuang ◽  
Jie Zhang ◽  
Guoxuan Lian ◽  
Bruce W. Drinkwater
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Low Noise ◽  
Wavenumber Domain ◽  
Imaging Parameters ◽  
Non Destructive Evaluation ◽  
Ultrasonic Array ◽  
Imaging Algorithms ◽  
Array Imaging ◽  
Non Destructive

Ultrasonic array imaging algorithms have been widely developed and used for non-destructive evaluation (NDE) in the last two decades. In this paper two widely used time domain algorithms are compared with two emerging frequency domain algorithms in terms of imaging performance and computational speed. The time domain algorithms explored here are the total focusing method (TFM) and plane wave imaging (PWI) and the frequency domain algorithms are the wavenumber algorithm and Lu’s frequency-wavenumber domain implementation of PWI. In order to make a fair comparison, each algorithm was first investigated to choose imaging parameters leading to overall good imaging resolution and signal-to-noise-ratio. To reflect the diversity of samples encountered in NDE, the comparison is made using both a low noise material (aluminium) and a high noise material (copper). It is shown that whilst wavenumber and frequency domain PWI imaging algorithms can lead to fast imaging, they require careful selection of imaging parameters.

MESFET large-signal model based on small-signal measurements for time-domain CAD

1988 ◽  
Vol 24 (15) ◽  
pp. 973 ◽  
Author(s):  
A. Ouslimani ◽  
G. Vernet ◽  
J.C. Henaux ◽  
P. Crozat ◽  
R. Adde
Keyword(s):  
Time Domain ◽  
Small Signal ◽  
Large Signal ◽  
Signal Model ◽  
Model Based

scholarly journals Prediction of deepwater riser VIV with an improved time domain model including non-linear structural behavior

2021 ◽  
Vol 236 ◽  
pp. 109508
Author(s):  
Sang Woo Kim ◽  
Svein Sævik ◽  
Jie Wu ◽  
Bernt Johan Leira
Keyword(s):  
Time Domain ◽  
Domain Model ◽  
Structural Behavior ◽  
Non Linear ◽  
Deepwater Riser
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