Experimental Determination Of The Quadratic Transfer Function Governing Slowly Oscillating Phenomena In Irregular Waves

1978 ◽  
Author(s):  
Rolf Rolf
Keyword(s):  
Transfer Function ◽  
Experimental Determination ◽  
Irregular Waves

Experimental Determination of Water Motions Inside a Moonpool

2017 ◽  
Author(s):  
Bastien Abeil
Keyword(s):  
Experimental Determination ◽  
Transfer Functions ◽  
Side Wall ◽  
Model Tests ◽  
Irregular Waves ◽  
Video Recordings ◽  
Non Linear ◽  
Relative Water ◽  
Water Elevation

Model tests of a drillship with a rectangular moonpool opening were conducted in regular and irregular waves from the bow and bow-quarter. Most tests were conducted at zero speed, the rest was performed with the model towed to a speed of 10 kn. From the video-recordings and transfer functions of the measured relative water elevation inside the moonpool, the typical piston and first sloshing modes are well captured, for wave frequencies that agree relatively well with relevant formulations. A few tests conducted at varying wave amplitudes show that the water elevation is non-linear by nature, while repeat tests conducted with the moonpool fitted with two layers of side wall flanges shows that these can reduce the water motions by nearly 40 %.

Transfer function approach to the experimental determination of mode transfer matrices

1990 ◽  
Vol 29 (21) ◽  
pp. 3166 ◽  
Author(s):  
S. Yang ◽  
D. R. Hjelme ◽  
I. P. Januar ◽  
I. P. Vayshenker ◽  
Alan R. Mickelson
Keyword(s):  
Transfer Function ◽  
Experimental Determination ◽  
Function Approach ◽  
Transfer Matrices

Theoretical and Experimental Determination of the Transfer Function of a Compressor

1984 ◽  
Author(s):  
Jacques Paulon
Keyword(s):  
Transfer Function ◽  
Experimental Determination ◽  
Mass Flow ◽  
Transient Pressure ◽  
Flow Fluctuations ◽  
Unsteady Regime

Aerodynamic operation of a compressor during transients and any unsteady regime is controlled by its response to transient pressure and mass flow fluctuations.

Experimental Determination of Flame Transfer Function Using Random Velocity Perturbations

2011 ◽  
Author(s):  
Alexis Cuquel ◽  
Daniel Durox ◽  
Thierry Schuller
Keyword(s):  
Transfer Function ◽  
Experimental Determination ◽  
Operating Conditions ◽  
Frequency Resolution ◽  
Modulation Amplitude ◽  
Combustion Instabilities ◽  
Velocity Signal ◽  
Burner Exit ◽  
Large Frequency

This study focus on the experimental determination of the Flame Transfer Function (FTF) which can be used to analyze acoustic induced combustion instabilities. In the present work random non-harmonic velocity signals are generated to perturb the flame. This method enables to rapidly determine the FTF compared to other techniques and improves the frequency resolution. A System Identification (SI) technique is applied to model the frequency response of different components of the test bench. It is firstly used to impose a white noise velocity signal at the burner exit, with a tunable perturbation level. SI tools and spectral analysis are used to reconstruct the FTF of a laminar conical flame. Experiments are conducted for different operating conditions and forcing levels. Results are compared with those obtained by harmonic modulations of the flow. They closely match over a large frequency range for small perturbation levels. The limits of the technique are examined when the modulation amplitude is increased.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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