Statistics of peak overpressure and shock steepness for linear and nonlinear N-wave propagation in a kinematic turbulence

2017 ◽  
Vol 142 (6) ◽  
pp. 3402-3415 ◽  
Author(s):  
Petr V. Yuldashev ◽  
Sébastien Ollivier ◽  
Maria M. Karzova ◽  
Vera A. Khokhlova ◽  
Philippe Blanc-Benon
Keyword(s):  
Wave Propagation ◽  
Linear And Nonlinear ◽  
N Wave

Simulation of N-wave propagation in turbulent atmosphere using standard and wide-angle parabolic equations

2020 ◽  
Vol 148 (4) ◽  
pp. 2615-2615
Author(s):  
Petr V. Yuldashev ◽  
Maria M. Karzova ◽  
Vera Khokhlova ◽  
Philippe Blanc-Benon
Keyword(s):  
Wave Propagation ◽  
Parabolic Equations ◽  
Turbulent Atmosphere ◽  
Wide Angle ◽  
N Wave

Linear and nonlinear wave propagation in rarefied plasmas

2002 ◽  
Vol 9 (6) ◽  
pp. 2593-2603 ◽  
Author(s):  
I. Ballai ◽  
R. Erdélyi ◽  
Y. Voitenko ◽  
M. Goossens
Keyword(s):  
Wave Propagation ◽  
Nonlinear Wave ◽  
Nonlinear Wave Propagation ◽  
Linear And Nonlinear

Delamination Detection in Composite Plates Using Linear and Nonlinear Ultrasonic Guided Waves

2019 ◽  
Author(s):  
Yanfeng Shen ◽  
Mingjing Cen
Keyword(s):  
Wave Propagation ◽  
Guided Waves ◽  
Fiber Composite ◽  
Composite Plates ◽  
Ultrasonic Guided Waves ◽  
Carbon Fiber Composite ◽  
Laser Doppler Vibrometry ◽  
Delamination Detection ◽  
Nonlinear Ultrasonic ◽  
Linear And Nonlinear

Abstract This paper presents a delamination detection strategy for composite plates using linear and nonlinear ultrasonic guided waves via the wave field imaging and signal processing based on Scanning Laser Doppler Vibrometry (SLDV). The anisotropic elastodynamics in composite plates is first studied. Two numerical methods are deployed to analyze the wave mechanics within the composite plates. The Semi-analytical Finite Element (SAFE) method is utilized to obtain the dispersion curves and mode shapes for a carbon fiber composite plate by bonding two quasi-isotropic carbon fiber composite panels together. The Local Interaction Simulation Approach has been employed to investigate the wave propagation and interaction with the delamination. Contact Acoustic Nonlinearity (CAN) between the delamination interfaces during wave damage interaction is presented as a potential mechanism for delamination detection. After developing an in-depth understanding of the wave propagation and wave damage interaction mechanism, active sensing experiments are conducted using the Piezoelectric Wafer Active Sensors (PWAS) and the Scanning Laser Doppler Vibrometry (SLDV). Two delamination imaging methodologies are presented. The first one utilizes the total wave energy to detect the delamination, taking advantage of the trapped modes within the delaminated area. The second one adopts the nonlinear second harmonic imaging algorithm, highlighting the nonlinear interaction traces at the delamination region. The damage detection images are finally compared and fused to provide detailed diagnostic information of the delamination. The damage imaging technique presented in this paper possesses great potential in material evaluation and characterization applications. This paper finishes with summary, concluding remarks, and suggestions for future work.

Waves, Buckles, and Homoclinics

2009 ◽  
Author(s):  
A. Srikantha Phani
Keyword(s):  
Wave Propagation ◽  
Plane Wave ◽  
Nonlinear Regime ◽  
Lattice Structures ◽  
Linear Regime ◽  
Numerical Examples ◽  
Wave Technique ◽  
Linear And Nonlinear ◽  
The Stability ◽  
Plane Wave Propagation

Dynamic response of lattice structures in linear and nonlinear regime is investigated. In the linear regime, connections between vibration and buckling are revisited in the context of plane wave propagation. The power of wave technique in picking up the correct bifurcation mode and the associated critical load is illustrated. The stability of spatially localised structures arising from homoclinics is examined in the nonlinear regime. Simple analytical results will be presented and illustrated using numerical examples.

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