Acoustic source model input parameter simulation via hydrodynamic modeling of breaking waves

2003 ◽  
Vol 114 (4) ◽  
pp. 2462-2462
Author(s):  
Steven L. Means ◽  
William G. Szymczak
Keyword(s):  
Input Parameter ◽  
Breaking Waves ◽  
Source Model ◽  
Hydrodynamic Modeling ◽  
Acoustic Source ◽  
Model Input ◽  
Model Input Parameter

A hydro‐acoustic source model in calculating noise field generated by breaking waves

2005 ◽  
Vol 118 (3) ◽  
pp. 2003-2003
Author(s):  
Xuemei Chen ◽  
Steven L. Means ◽  
William G. Szymczak ◽  
Joel C. W. Rogers
Keyword(s):  
Breaking Waves ◽  
Source Model ◽  
Acoustic Source ◽  
Noise Field

Hydrodynamic Modeling for Stationary Breaking Waves

2004 ◽  
Author(s):  
David T. Walker ◽  
Ales Alajbegovic ◽  
Jason D. Hunt
Keyword(s):  
Breaking Waves ◽  
Hydrodynamic Modeling

scholarly journals Polar F-layer model-observation comparisons: a neutral wind surprise

2005 ◽  
Vol 23 (1) ◽  
pp. 191-199 ◽  
Author(s):  
J. J. Sojka ◽  
M. David ◽  
R. W. Schunk ◽  
A. P. van Eyken
Keyword(s):  
Input Parameter ◽  
Auroral Oval ◽  
Neutral Wind ◽  
Neutral Atmosphere ◽  
State University ◽  
Utah State University ◽  
Daily Weather ◽  
Magnetospheric Convection ◽  
Ionospheric Models ◽  
Model Input Parameter

Abstract. The existence of a month-long continuous database of incoherent scatter radar observations of the ionosphere from the EISCAT Savlbard Radar (ESR) at Longyearbyen, Norway, provides an unprecedented opportunity for model/data comparisons. Physics-based ionospheric models, such as the Utah State University Time Dependent Ionospheric Model (TDIM), are usually only compared with observations over restricted one or two day events or against climatological averages. In this study, using the ESR observations, the daily weather, day-to-day variability, and month-long climatology can be simultaneously addressed to identify modeling shortcomings and successes. Since for this study the TDIM is driven by climatological representations of the magnetospheric convection, auroral oval, neutral atmosphere, and neutral winds, whose inputs are solar and geomagnetic indices, it is not surprising that the daily weather cannot be reproduced. What is unexpected is that the horizontal neutral wind has come to the forefront as a decisive model input parameter in matching the diurnal morphology of density structuring seen in the observations.

scholarly journals An acoustic source model for asymmetric intraglottal flow with application to reduced-order models of the vocal folds

PLoS ONE ◽  
2019 ◽  
Vol 14 (7) ◽  
pp. e0219914
Author(s):  
Byron D. Erath ◽  
Sean D. Peterson ◽  
Kelley S. Weiland ◽  
Michael W. Plesniak ◽  
Matías Zañartu
Keyword(s):  
Vocal Folds ◽  
Source Model ◽  
Reduced Order Models ◽  
Acoustic Source ◽  
Reduced Order

Uncertainty Quantification of Aeroacoustic Power Sources in Corrugated Pipes

2015 ◽  
Author(s):  
Maharudrayya Swamy ◽  
Pejman Shoeibi Omrani ◽  
Nestor Gonzalez Diez
Keyword(s):  
Uncertainty Quantification ◽  
Input Parameter ◽  
Distribution Functions ◽  
Geometrical Parameters ◽  
Acoustic Source ◽  
Parameter Uncertainties ◽  
Source Power ◽  
Power Sources ◽  
Edge Radius ◽  
Onset Velocity

Gas transport in corrugated pipes often exhibit whistling behavior, due to periodic flow-induced pulsations generated in the pipe cavities. These aero-acoustic sources are strongly dependent on the geometrical dimensions and features of the cavities. As a result, uncertainties in the exact shape and geometry play a significant role in determining the singing behavior of corrugated pipes. While predictive modelling for idealized periodic structures is well established, this paper focusses on the sensitivity analysis and uncertainty quantification (UQ) of uncertain geometrical parameters using probabilistic models. The two most influential geometrical parameters varied within this study are the cavity width and downstream edge radius. Computational Fluid Dynamics (CFD) analysis was used to characterize the acoustic source. Stochastic collocation method was used for propagation of input parameter uncertainties. The analysis was performed with both full tensor product grid and sparse grid based on level-2 Clenshaw-Curtis points. The results show that uncertainties in the width and downstream edge radius of the cavity have an effect on the acoustic source power, peak Strouhal number and consequently the whistling onset velocity. Based on the assumed input parameters distribution functions, the confidence levels for the prediction of onset velocity were calculated. Finally, the results show the importance of performing uncertainty analysis to get more insights in the source of errors and consequently leading to a more robust design or risk-management oriented decision.

Diesel Engine Combustion Monitoring Based on Acoustic Measurement of Exhaust Systems

2006 ◽  
Author(s):  
R. Gennish ◽  
J. Jiang ◽  
A. Albarbar ◽  
G. Harris ◽  
F. Gu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Exhaust System ◽  
Source Model ◽  
Acoustic Measurement ◽  
Engine Fuel ◽  
Acoustic Source ◽  
Engine Combustion ◽  
Combustion Monitoring ◽  
Exhaust Systems

This paper presents a novel monitoring approach to diesel engine combustion based on acoustic measurement of exhaust systems. It investigates the acoustic characteristics from the measurements of individual sensors and their combination based on a linear one port acoustic source model. It has been found that the strength, in terms of pressure, of the acoustic source gives a more accurate representation of engine acoustics because it is obtained by minimizing the reflection effects in the exhaust system. Therefore, the pressure waveform produces more accurate monitoring results for abnormal combustions such as those caused by faults in engine fuel injection systems.

Physical Insight of the Source Data of a Two-Port Acoustic Source Model

2010 ◽  
Vol 44-47 ◽  
pp. 3413-3417
Author(s):  
Bin Zhang ◽  
Xue Jun Liu ◽  
Rui Xiang Song ◽  
Bin Liu ◽  
Tao Feng
Keyword(s):  
Boundary Condition ◽  
External Source ◽  
Source Model ◽  
State Equation ◽  
Acoustic Source ◽  
Theoretical Derivation ◽  
Acoustic Boundary Condition ◽  
Source Data ◽  
Physical Insight ◽  
Full Absorption

The physical insight of the source data of two-port acoustic source model for a duct is studied in theoretical, experimental and numerical aspects respectively. Under the ideal acoustic boundary condition of full absorption at the duct ends, the state equation of two-port acoustic source model is discussed, and the physical insight of the source data is obtained through theoretical derivation. The experimental model of two-port acoustic source is established, and the source data have been measured by the method “with an external source”. The physical meaning of source data has been demonstrated through the experimental method. The numerical simulating model for the experiment system is built, and the source data obtained numerically are compared with those measured experimentally for research. From the comparison, it is concluded that the source data of two-port acoustic source model are the traveling wave propagating outside along the duct under the acoustic boundary condition of full absorption at duct ends.

On the dipole acoustic source level of breaking waves

1994 ◽  
Vol 96 (5) ◽  
pp. 3036-3044 ◽  
Author(s):  
Li Ding ◽  
David M. Farmer
Keyword(s):  
Breaking Waves ◽  
Acoustic Source ◽  
Source Level
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