On the topology of the complex wave spectrum in a fluid‐coupled elastic layer

1989 ◽  
Vol 85 (3) ◽  
pp. 1074-1080 ◽  
Author(s):  
S. I. Rokhlin ◽  
D. E. Chimenti ◽  
A. H. Nayfeh
Keyword(s):  
Elastic Layer ◽  
Wave Spectrum ◽  
Complex Wave

PROPAGATION OF ACOUSTICS WAVES OF NONSIMPLEX FORM IN A MATERIAL WITH HYSTERETIC QUADRATIC NONLINEARITY: ANALYSIS AND NUMERICAL SIMULATIONS

2004 ◽  
Vol 12 (03) ◽  
pp. 319-354 ◽  
Author(s):  
V. ALESHIN ◽  
V. GUSEV ◽  
V. YU. ZAITSEV
Keyword(s):  
Acoustic Wave ◽  
Qualitative Agreement ◽  
Numerical Scheme ◽  
Wave Spectrum ◽  
Quadratic Nonlinearity ◽  
Nonlinear Propagation ◽  
Wave Transformation ◽  
Complex Wave ◽  
Wave Emission ◽  
Induced Transparency

The numerical scheme for the analysis of the acoustic wave transformation in materials with nonlinearity hysteresis and end-point memory is developed. Both numerical and analytical predictions are obtained concerning mixing of a wave at fundamental frequency (ω-wave) and a wave at doubled frequency (2ω-wave) in the materials with hysteretic quadratic nonlinearity. The observed wave spectrum broadening is found to be in qualitative agreement with the selection rules for the multi-phonon processes in this type of materials. The predicted transformation of an initially complex wave (with four extrema over a period) into a simplex wave (with two extrema over a period) in nonlinear propagation is found to be one of the manifestations of the nonlinear hysteretic absorption. It is demonstrated that at short propagation distances the interaction of the ω- and 2ω-waves is mainly through the mechanism of the nonlinear hysteretic absorption and is not strongly influenced by the process of higher harmonics generation and their inverse influence on the input waves. The regimes of the induced and self-induced transparency are predicted. The influence of the transition from the simplex wave to complex wave emission (or vice versa) on the processes of the induced absorption and transparency is identified.

Millimetre-wave spectrum of the Ar-CO complex: the K = 2 ← 1 and 3 ← 2 subbands

1997 ◽  
Vol 92 (2) ◽  
pp. 229-236 ◽  
Author(s):  
M. HEPP ◽  
R. GENDRIESCH ◽  
I. PAK ◽  
Y.A. KURITSYN ◽  
F. LEWEN ◽  
...  
Keyword(s):  
Wave Spectrum ◽  
Millimetre Wave

SH-Wave Scattering From the Interface Defect

2017 ◽  
Vol 5 (1) ◽  
pp. 45-50
Author(s):  
Myron Voytko ◽  
◽  
Yaroslav Kulynych ◽  
Dozyslav Kuryliak
Keyword(s):  
Half Space ◽  
Wave Diffraction ◽  
Scattered Field ◽  
Wave Scattering ◽  
Elastic Layer ◽  
Analytical Form ◽  
Structure Parameters ◽  
Sh Wave ◽  
Interface Defect ◽  
Hopf Method

The problem of the elastic SH-wave diffraction from the semi-infinite interface defect in the rigid junction of the elastic layer and the half-space is solved. The defect is modeled by the impedance surface. The solution is obtained by the Wiener- Hopf method. The dependences of the scattered field on the structure parameters are presented in analytical form. Verifica¬tion of the obtained solution is presented.

Flow resistivity, characteristic impedance and complex wave number assessment of coconut fiber with thin thickness samples.

2017 ◽  
Author(s):  
Key Fonseca de Lima ◽  
Nilson Barbieri ◽  
Fernando Jun Hattori Terashima ◽  
Vinicius Antonio Grossl ◽  
Nelson Legat Filho
Keyword(s):  
Characteristic Impedance ◽  
Wave Number ◽  
Coconut Fiber ◽  
Complex Wave ◽  
Flow Resistivity ◽  
Complex Wave Number
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