Structural evolution of fused optic-fiber components: numerical simulations and experimental study

2018 ◽  
Author(s):  
Avihai Spizzichino ◽  
Sharone Goldring ◽  
Yuri Feldman ◽  
Omer Porat
Keyword(s):  
Experimental Study ◽  
Numerical Simulations ◽  
Structural Evolution ◽  
Optic Fiber ◽  
Fiber Components

Numerical simulations and experimental study of terahertz photoconductive antennas based on GaAs and its ternary compounds

2018 ◽  
Author(s):  
Denis V. Lavrukhin ◽  
Alexander E. Yachmenev ◽  
Rinat R. Galiev ◽  
Igor A. Glinskiy ◽  
Rustam A. Khabibullin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Simulations ◽  
Photoconductive Antennas ◽  
Ternary Compounds

Hrem Observations, Peels Analysis and Numerical Simulations of Au/Ni Mbe Multilayers

1993 ◽  
Vol 319 ◽  
Author(s):  
Pascale Bayle ◽  
T. Deutsch ◽  
B. Gilles ◽  
F. LancÇn ◽  
A. Marty ◽  
...  
Keyword(s):  
Image Processing ◽  
Structural Change ◽  
Numerical Simulations ◽  
Structural Evolution ◽  
Hrem Image ◽  
Chemical Profile

AbstractThe structural evolution of Au/Ni multilayers (with an increasing number of Ni monolayers (MLs)) has been investigated by HREM. As soon as the thickness of Ni becomes larger than 5 MLs, a structural change occurs which in fact has been predicted by numerical simulations. The deformation in the multilayer has been characterised by HREM image processing and has been related to the Ni profile. This profile has been compared to the chemical profile obtained by scanning PEELS analysis through the multilayer.

Experimental study and numerical simulations of a plasma relativistic microwave amplifier

2010 ◽  
Vol 36 (9) ◽  
pp. 762-771 ◽  
Author(s):  
I. L. Bogdankevich ◽  
I. E. Ivanov ◽  
P. S. Strelkov
Keyword(s):  
Experimental Study ◽  
Numerical Simulations ◽  
Microwave Amplifier

Experimental Study of Very Low Aspect Ratio Wings in Slender Bodies

2012 ◽  
Author(s):  
M. A. Arevalo-Campillos ◽  
S. Tuling ◽  
L. Parras ◽  
C. del Pino ◽  
L. Dala
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Numerical Simulations ◽  
Water Channel ◽  
Vortex Sheet ◽  
The Body ◽  
Low Aspect Ratio ◽  
Moderate Reynolds Number ◽  
Slender Bodies ◽  
Low Aspect Ratio Wings

The dynamics of very low aspect ratio wings (or strakes) vortices in slender bodies are complex due to the interaction of the shed vortex sheet and the body vortex. For missiles at supersonic speeds these interactions are not easily predicted using engineering level tools. To shed some new light onto this problem, an experimental study in a water channel for moderate Reynolds number (Re = 1000) was performed for a 19D body and strake configuration with strakes having a span to body diameter ratio of 1.25. Comparisons to numerical simulations in supersonic flow are also performed. Flow visualisation has been carried out to characterize the vortex dynamics at different angles of attack; these being 11°, 16°, 22° and 27°. The comparison between a slender body without strakes and the body-strake configuration has given some key indicators in relation to the vortex position of the core. Furthermore, unsteady wing-body interference has been observed at angles of attack above 20° for both experimental and numerical simulations. Consequently, the average position of the vortex core is located at larger distances from the missile in comparison to the body without strakes. The numerical simulations show good correlation with the experimental tests even though the dynamic convective interactions between the body vortex and strake vortex sheet are not predicted.

Parameters deduced from the pressuremeter test

2002 ◽  
Vol 39 (6) ◽  
pp. 1333-1340 ◽  
Author(s):  
A Fawaz ◽  
M Boulon ◽  
E Flavigny
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Numerical Simulations ◽  
Fine Sand ◽  
Numerical Results ◽  
Pressuremeter Test ◽  
The Relationship ◽  
Pressuremeter Modulus

This paper presents a study of the pressuremeter test and the results that can be obtained from this test. Hostun's fine sand was chosen as the material upon which to perform the experimental study of the pressuremeter. Numerical simulations of the pressuremeter tests have been made with the commercially available PLAXIS software. The numerical results have been compared with the experimental ones. The variation of the parameters resulting from an applied surcharge was studied experimentally and numerically. Finally, the relationship between the magnitude of the deformation and the pressuremeter modulus was analyzed.Key words: sand, pressuremeter, triaxial, pressure, modulus, deformation, numerical simulation.

Rotational Compliance Measurements of a Flexible Plane Structure Using an Attached Beam-like Tip, Part 2: Experimental Study

1997 ◽  
Vol 119 (4) ◽  
pp. 603-608 ◽  
Author(s):  
Y. C. Qu ◽  
L. Cheng ◽  
D. Rancourt
Keyword(s):  
Experimental Study ◽  
Error Analysis ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Companion Paper ◽  
Experimental Measurements ◽  
Frequency Range ◽  
Experimental Assessment ◽  
Different Types ◽  
Modal Behavior

This paper presents an experimental assessment of the Tip Excitation Technique (TET) introduced in a companion paper. The aim of the technique is to measure the rotational compliance of attached plane structures. Following the guidelines established on the basis of a numerical study in the companion paper, experimental measurements were performed on a rectangular plate and results were compared with numerical simulations. The investigation focuses on the general performance of the technique, on the different types of excitation used and on other factors necessary to ensure accurate results. In addition, an error analysis is conducted to demonstrate the sensitivity of the results to biased measurement quantities. It is concluded that the proposed technique can be used in the low to middle frequency range, where relatively strong modal behavior is involved.

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