Identification of transmission lines: from time domain measurements to frequency domain models

2003 ◽  
Author(s):  
W. De Block ◽  
R. Pintelon ◽  
Y. Rolain
Keyword(s):  
Frequency Domain ◽  
Transmission Lines ◽  
Time Domain ◽  
Domain Models

Wave Exciting Forces of a Free Floating Semi Submersible in Regular Waves

2015 ◽  
Vol 74 (5) ◽  
Author(s):  
Hassan Abyn ◽  
Mohammad Rafiqul Islam ◽  
Jaswar Jaswar ◽  
Amin Mahmoudi ◽  
C. L. Siow ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Domain Analysis ◽  
Offshore Structures ◽  
Source Distribution ◽  
Linear Wave ◽  
Distribution Method ◽  
Exciting Forces ◽  
Domain Models ◽  
Wave Exciting Forces

Drilling and production of oil by semi submersible take place in many locations throughout the world. Generally, floating structures play an important role in exploring the oil and gas from the sea. The force and motion prediction of offshore structures may be carried out using time domain or frequency domain models or model tests. In this paper the frequency domain analysis used because it is the simplified and linearized form of the equations of motion. The time domain analysis, unlike frequency domain models, is adequate to deal with non-linearities such as viscous damping and mooring forces, but it requires sophisticated solution techniques and it is expensive to employ. In this paper, the wave exciting forces of a free floating semi-submersible were carried out using 3D source distribution method within the scope of the linear wave theory. The results obtained from computations were also compared with the results obtained using commercial software MOSES and WAMIT.  

Circuit Models of Lossy Multic onductor Transmission Lines: Incident Plane Wave Effect

2016 ◽  
Vol 6 (5) ◽  
pp. 2369
Author(s):  
Saih Mohamed ◽  
Rouijaa Hicham ◽  
Ghammaz Abdelilah
Keyword(s):  
Plane Wave ◽  
Frequency Domain ◽  
Transmission Lines ◽  
Time Domain ◽  
Method Of Characteristics ◽  
Incident Plane Wave ◽  
Wave Effect ◽  
Incident Plane ◽  
Simulation Results ◽  
The Time Domain

<p>In this paper, we concentrate on the variety impacts of incident plane wave on multiconductor transmission lines, utilizing Branin’s method, which is alluded to as the method of characteristics. The model can be directly used for the time-domain and frequency-domain analyses, Moreover,  it had the advantage of being used without the need of setting the  preconditions of  the  charges  applied  to  its  ends; this permits it to be effortlessly embedded in circuit simulators, for example Spice, Saber, and Esacap. This model validity is affirmed by contrasting our simulation results under ESACAP and different results, and we will talk about variety impacts of incident plane wave.</p>

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