Experimental evidence of mode coupling in drift wave intermittent turbulence using a wave number bicoherence analysis

2006 ◽  
Vol 13 (12) ◽  
pp. 122305 ◽  
Author(s):  
F. Brochard ◽  
T. Windisch ◽  
O. Grulke ◽  
T. Klinger
Keyword(s):  
Experimental Evidence ◽  
Mode Coupling ◽  
Wave Number ◽  
Intermittent Turbulence ◽  
Drift Wave

Spectrum Cascade by Mode Coupling in Drift-Wave Turbulence

1978 ◽  
Vol 41 (21) ◽  
pp. 1470-1473 ◽  
Author(s):  
Akira Hasegawa ◽  
Yuji Kodama
Keyword(s):  
Mode Coupling ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave

Toroidal mode coupling effects on drift wave stability

1978 ◽  
Vol 21 (8) ◽  
pp. 1366 ◽  
Author(s):  
Wendell Horton ◽  
R. Estes ◽  
H. Kwak ◽  
Duk-In Choi
Keyword(s):  
Mode Coupling ◽  
Coupling Effects ◽  
Drift Wave ◽  
Toroidal Mode ◽  
Wave Stability

scholarly journals TEMPERATURE DEPENDENCE OF SECONDARY RELAXATION IN A SUPERCOOLED LIQUID

2001 ◽  
Vol 15 (32) ◽  
pp. 4199-4209
Author(s):  
SUDHA SRIVASTAVA ◽  
SHANKAR P. DAS
Keyword(s):  
Temperature Dependence ◽  
Time Scales ◽  
Mode Coupling ◽  
Defect Density ◽  
Supercooled Liquid ◽  
Wave Number ◽  
Coupling Theory ◽  
Slow Mode ◽  
Secondary Relaxation ◽  
Lennard Jones

The dynamics of Lennard–Jones fluid is studied through extended mode coupling theory (MCT) with the inclusion of the slow mode of defect density. Inclusion of defect density facilitates the liquid like state for temperatures much lower than predicted from ideal MCT. In the present paper we consider the secondary relaxation over time scales long compared to microscopic time scales but shorter than the final relaxation. Particularly we study the temperature dependence and wave number dependence of the relaxation process.

Prediction and suppression of inconsistent natural frequency and mode coupling of a cylindrical ultrasonic stator

2010 ◽  
Vol 224 (9) ◽  
pp. 1853-1862 ◽  
Author(s):  
S Wang ◽  
J Xiu ◽  
J Gu ◽  
J Xu ◽  
J Liu ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Effective Means ◽  
Wave Number ◽  
Analysis Method ◽  
Ultrasonic Motors ◽  
Modal Properties ◽  
Thin Ring ◽  
Motor Design ◽  
Direct Perturbation ◽  
Quantitative Understanding

Inconsistent frequency and mode coupling are primary concerns of ultrasonic motors. These modal properties are influenced by motor features, including piezoelectric ceramics, stator teeth, or other supports attached on a stator. While this influence is understood intuitively and has been studied numerically, they have not been clarified analytically. This work develops the analytical model of the example cylindrical stator and uses it to study the influence of the features on the modal properties. In this model, the stator is considered as a thin ring with equally spaced features. The analytical solution of the model is obtained by using the direct perturbation analysis, which connects the feature number and the wave number with the modal properties, and naturally provides an effective means to achieve the coincident frequency and suppress or even eliminate the predominant mode coupling only by optimizing the combination of the two numbers. Simulation results are well consistent with the analytical conclusions. The main feature of this work is that a quick and quantitative understanding of the effects of deviation from the perfect cylindrical stator is obtained. In addition, the derived analytical results contribute to the applications of common ultrasonic motor design choices. Furthermore, while the terminology of a cylindrical stator is used in this work, the analysis method applies for other stators, such as the disc-like or linear stator.

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