Visualization and Modeling of Short Wave Propagation by Using Genetic Algorithm and S-Transformation

2005 ◽  
Author(s):  
X. Wang
Keyword(s):  
Genetic Algorithm ◽  
Wave Propagation ◽  
Short Wave

Ultra-Short Wave Propagation*

1933 ◽  
Vol 12 (2) ◽  
pp. 125-161 ◽  
Author(s):  
J. C. Schelleng ◽  
C. R. Burrows ◽  
E. B. Ferrell
Keyword(s):  
Wave Propagation ◽  
Short Wave

Internal waves in a horizontally inhomogeneous flow

1984 ◽  
Vol 142 ◽  
pp. 233-249 ◽  
Author(s):  
A. Ya. Basovich ◽  
L. Sh. Tsimring
Keyword(s):  
Wave Propagation ◽  
Internal Wave ◽  
Internal Waves ◽  
Short Wave ◽  
Wave Transformation ◽  
Wave Trapping ◽  
Wave Amplification ◽  
Normal Surfaces ◽  
Inhomogeneous Flow ◽  
Horizontally Inhomogeneous

The effect of horizontally inhomogeneous flows on internal wave propagation in a stratified ocean with a constant Brunt-Väisälä frequency is analysed. Dispersion characteristics of internal waves in a moving fluid and kinematics of wave packets in smoothly inhomogeneous flows are considered using wave-normal surfaces. It is shown that internal-wave blocking and short-wave transformation may occur in longitudinally inhomogeneous flows. For parallel flows internal-wave trapping is possible in the vicinity of the limiting layer where the wave frequency in the locally comoving frame of reference coincides with the Brunt-Väisälä frequency. Internal-wave trapping also takes place in jet-type flows in the vicinity of the flow-velocity maximum. WKB solutions of the equation describing internal-wave propagation in a parallel horizontally inhomogeneous flow in the linear approximation are obtained. Singular points of this equation and the related effect of internal-wave amplification (overreflection) under the action of the flow are investigated. The spectrum and the growth rate of internal-wave localized modes in a jet-type flow are obtained.

scholarly journals Vibration Attenuation Optimization in a Rod With Different Periodic Piezoelectric Shunting Configurations

2021 ◽  
Vol 26 (3) ◽  
pp. 212-220
Author(s):  
Hui Guo ◽  
Yaru Zhang ◽  
Tao Yuan ◽  
Pei Sun Qian ◽  
Qian Cheng ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Wave Propagation ◽  
Numerical Model ◽  
Elastic Wave ◽  
Vibration Control ◽  
Wave Attenuation ◽  
Broad Band ◽  
Band Gaps ◽  
Attenuation Constant ◽  
Vibration Attenuation

Wave propagation control in piezoelectric meta-materials has been extensively investigated in recent years due to its significant effects on elastic wave attenuation. In this work, a novel piezoelectric meta-material rod connected to three configurations of shunting circuits is proposed for broad band gaps. The numerical model is constructed to predict the band gap, attenuation constant, and vibration transmission. For larger attenuation within the band gaps, the shunting circuit parameters are optimized with a genetic algorithm. The result shows that the structure with the optimized parameters provides prominent vibration control ability. Both the attenuation constant and the width of the band gaps are enlarged.

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