Nonlinear acoustic method for bubble density measurements in water

1998 ◽  
Vol 103 (5) ◽  
pp. 2377-2384 ◽  
Author(s):  
A. M. Sutin ◽  
S. W. Yoon ◽  
E. J. Kim ◽  
I. N. Didenkulov
Keyword(s):  
Acoustic Method ◽  
Density Measurements ◽  
Bubble Density ◽  
Nonlinear Acoustic

Nonlinear acoustic method for bubble density measurements.

1996 ◽  
Vol 99 (4) ◽  
pp. 2514-2529
Author(s):  
Alexander M. Sutin ◽  
Suk‐Wang Yoon ◽  
Eui‐Jun Kim ◽  
Igor N. Didenkulov
Keyword(s):  
Acoustic Method ◽  
Density Measurements ◽  
Bubble Density ◽  
Nonlinear Acoustic

Concrete damage diagnosed using the non-classical nonlinear acoustic method

2009 ◽  
Vol 18 (5) ◽  
pp. 1898-1905 ◽  
Author(s):  
Zhou Dao ◽  
Liu Xiao-Zhou ◽  
Gong Xiu-Fen ◽  
Nazarov V E ◽  
Ma Li
Keyword(s):  
Acoustic Method ◽  
Concrete Damage ◽  
Nonlinear Acoustic

Varied amplitude nonlinear acoustic method of landmine detection

2007 ◽  
Vol 122 (5) ◽  
pp. 3060
Author(s):  
Laurent Fillinger ◽  
Brad Libbey ◽  
Alexander Sutin ◽  
Armen Sarvazyan
Keyword(s):  
Acoustic Method ◽  
Landmine Detection ◽  
Nonlinear Acoustic ◽  
Varied Amplitude

Multi-crack imaging using nonclassical nonlinear acoustic method

2014 ◽  
Vol 23 (10) ◽  
pp. 104301 ◽  
Author(s):  
Lue Zhang ◽  
Ying Zhang ◽  
Xiao-Zhou Liu ◽  
Xiu-Fen Gong
Keyword(s):  
Acoustic Method ◽  
Nonlinear Acoustic

scholarly journals Nonlinear Acoustic Modeling and Measurements during the Fatigue Process in Metals

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 607
Author(s):  
Wenhan Lyu ◽  
Xianmei Wu ◽  
Weijiang Xu
Keyword(s):  
Early Stage ◽  
Acoustic Method ◽  
Spring Model ◽  
Spring Stiffness ◽  
Fatigue Process ◽  
Micro Cracks ◽  
Expansion Stage ◽  
Three Stages ◽  
Nonlinear Acoustic ◽  
Fatigue Evaluation

The nonlinear spring model combined with dislocation dipole theory was applied to describe the acoustic nonlinearity during the fatigue process in metals. The spring stiffness changes with fatigue degree. For the early stage, spring stiffness approaches infinity, and the heavier nonlinearity mainly results from the increase of dislocation density. Further fatigue leads to the occurrence of micro-cracks, during which spring stiffness begins to decrease. Abundant micro-crack sprouting accelerates the crack’s expansion, and spring stiffness drops quickly, which causes the obvious decline in the transmitted harmonic amplitudes. Solutions obtained from the nonlinear wave equation with dislocation terms were added into the spring model. Varying spring stiffness was chosen for simulating the fatigue process. Then, nonlinear harmonic variation during this process was observed, which was classified into three stages: (I) the early dislocation fatigue stage; (II) the micro-crack sprouting stage; (III) the crack expansion stage. Nonlinear acoustic measurements were carried out on an aluminum alloy specimen during its fatigue process until cracks could be seen clearly. Harmonic variations in experiments can also be classified into the same three stages as the numerical results, which provides a theoretical and experimental reference for fatigue evaluation in metals using the nonlinear acoustic method.

Bubble density measurements with HPD 2 at CERN

1971 ◽  
Vol 94 (2) ◽  
pp. 333-341 ◽  
Author(s):  
P. Duinker ◽  
E. Quercigh
Keyword(s):  
Density Measurements ◽  
Bubble Density
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