Towards an Airframe Noise Prediction Methodology: Survey of Current Approaches

In this paper, we present a critical survey of the current airframe noise (AFN) prediction methodologies. Four methodologies are recognized. These are the fully analytic method, CFD combined with the acoustic analogy, the semi-empirical method and fully numerical method. It is argued that for the immediate need of the aircraft industry, the semi-empirical method based on recent high quality acoustic database is the best available method. The method based on CFD and the Ffowcs WilliamHawkings (FW-H) equation with penetrable data surface (FW-H pds ) has advanced considerably and much experience has been gained in its use. However, more research is needed in the near future particularly in the area of turbulence simulation. The fully numerical method will take longer to reach maturity. Based on the current trends, it is predicted that this method will eventually develop into the method of choice. Both the turbulence simulation and propagation methods need to develop more for this method to become useful. Nonetheless, the authors propose that the method based on a combination of numerical and analytical techniques, e.g., CFD combined with FW-H equation, should also be worked on. In this effort, the current symbolic algebra software will allow more analytical approaches to be incorporated into AFN prediction methods.

[1]  F. Farassat,et al.  The Role of Analytic Methods in Computational Aeroacoustics , 2003 .

[2]  Thomas F. Brooks,et al.  Flap Edge Aeroacoustic Measurements and Predictions , 2003 .

[3]  Yueping Guo.  Airframe noise prediction , 2008 .

[4]  Christopher K. W. Tam,et al.  Wall boundary conditions for high-order finite difference schemes in computational aeroacoustics , 1994 .

[5]  M.Y. Hussaini,et al.  Low-Dissipation and Low-Dispersion Runge-Kutta Schemes for Computational Acoustics , 1994 .

[6]  Craig L. Streett,et al.  In Search of the Physics: The Interplay of Experiment and Computation in Slat Aeroacoustics , 2003 .

[7]  N. Curle.  The influence of solid boundaries upon aerodynamic sound , 1955, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[8]  Meng Wang,et al.  COMPUTATIONAL PREDICTION OF FLOW-GENERATED SOUND , 2006 .

[9]  David P. Lockard,et al.  The Airframe Noise Reduction Challenge , 2004 .

[10]  R. Amiet.  Noise due to turbulent flow past a trailing edge , 1976 .

[11]  David P. Lockard,et al.  Simulation of acoustic scattering from a trailing edge , 1999 .

[12]  F. Farassat,et al.  The Kirchhoff Formulas for Moving Surfaces in Aeroacoustics---The Subsonic and Supersonic Cases , 1996 .

[13]  G. P. Succi,et al.  A review of propeller discrete frequency noise prediction technology with emphasis on two current methods for time domain calculations , 1980 .

[14]  M. S. Howe.  Edge-source acoustic Green's function for an airfoil of arbitrary chord, with application to trailing-edge noise , 2001 .

[15]  M. Y. Hussaini,et al.  Computation of Engine Noise Propagation and Scattering off An Aircraft , 2002 .

[16]  C. Tam,et al.  A Study of the Short Wave Components in Computational Acoustics , 1993 .

[17]  David P. Lockard,et al.  A COMPARISON OF FFOWCS WILLIAMS-HAWKINGS SOLVERS FOR AIRFRAME NOISE APPLICATIONS , 2002 .

[18]  Y. Guo,et al.  On the Computation and Application of Exact Green's Function in Acoustic Analogy , 2005 .

[19]  F. Farassat,et al.  Extension of Kirchhoff's formula to radiation from moving surfaces , 1988 .

[20]  D. G. Crighton.  Radiation from vortex filament motion near a half plane , 1972 .

[21]  M G Macaraeg,et al.  Fundamental Investigations of Airframe Noise , 1998 .

[22]  Christophe Bailly,et al.  Computation of flow noise using source terms in linearized Euler's equations , 2000 .

[23]  D. Casalino.  An advanced time approach for acoustic analogy predictions , 2003 .

[24]  P. D. Francescantonio.  A NEW BOUNDARY INTEGRAL FORMULATION FOR THE PREDICTION OF SOUND RADIATION , 1997 .

[25]  M. S. Howe.  Trailing Edge Noise at Low Mach Numbers, Part 2: Attached and Separated Edge Flows , 2000 .

[26]  R. K. Amiet.  A note on edge noise theories , 1981 .

[27]  David P. Lockard,et al.  Hybrid acoustic predictions , 2003 .

[28]  Ana F. Tinetti,et al.  Aeroacoustic Scattering via the Equivalent Source Method , 2004 .

[29]  R. Amiet.  Acoustic radiation from an airfoil in a turbulent stream , 1975 .

[30]  Martin R. Fink.  Propulsive lift noise , 1991 .

[31]  Thomas F. Brooks,et al.  Rotor Broadband Noise Prediction with Comparison to Model Data , 2001 .

[32]  F. Farassat,et al.  Aircraft Engine Noise Scattering By Fuselage and Wings: A Computational Approach , 2003 .

[33]  C. Tam,et al.  Dispersion-relation-preserving finite difference schemes for computational acoustics , 1993 .

[34]  I. E. Garrick,et al.  A theoretical study of the effect of forward speed on the free-space sound-pressure field around propellers , 1953 .

[35]  F. Farassat,et al.  Modeling aerodynamically generated sound of helicopter rotors , 2003 .

[36]  M. S. Howe.  TRAILING EDGE NOISE AT LOW MACH NUMBERS , 1999 .

[37]  F. Farassat,et al.  A New Time Domain Formulation for Broadband Noise Predictions , 2002 .

[38]  Ann P. Dowling,et al.  Modern Methods in Analytical Acoustics: Lecture Notes , 1992 .

[39]  J. Williams,et al.  Aerodynamic sound generation by turbulent flow in the vicinity of a scattering half plane , 1970, Journal of Fluid Mechanics.

[40]  Yueping Guo,et al.  Development of Computational Aeroacoustics Tools for Airframe Noise Calculations , 2004 .

[41]  David P. Lockard,et al.  Shear effects in aeroacoustic predictions , 2003 .

[42]  Ana F. Tinetti,et al.  Airframe Noise Prediction by Acoustic Analogy: Revisited , 2006 .

[43]  F. Farassat.  Linear Acoustic Formulas for Calculation of Rotating Blade Noise , 1981 .

[44]  A. Powell.  Aerodynamic Noise and the Plane Boundary , 1960 .

[45]  F. Farassat,et al.  An Analytical Comparison of the Acoustic Analogy and Kirchhoff Formulation for Moving Surfaces , 1997 .

[46]  Meelan Choudhari,et al.  Application of Passive Porous Treatment to Slat Trailing Edge Noise , 2003 .

[47]  C. Bogey,et al.  A family of low dispersive and low dissipative explicit schemes for flow and noise computations , 2004 .

[48]  Mehdi R. Khorrami,et al.  Time-Accurate Simulations and Acoustic Analysis of Slat Free Shear Layer , 2002 .

[49]  Yueping Guo,et al.  Component-based empirical model for high-lift system noise prediction , 2003 .

[50]  Mehdi R. Khorrami,et al.  TIME-ACCURATE SIMULATIONS AND ACOUSTIC ANALYSIS OF , 2002 .

[51]  F. Farassat,et al.  Introduction to Generalized Functions With Applications in Aerodynamics and Aeroacoustics , 1994 .

[52]  R. H. Schlinker,et al.  Helicopter rotor trailing edge noise , 1981 .

[53]  Ana F. Tinetti,et al.  Aeroacoustic Noise Prediction Using the Fast Scattering Code , 2005 .

[54]  M. S. Howe.  Theory of Vortex Sound , 2002 .

[55]  C. Bogey,et al.  Computation of Flow Noise Using Source Terms in Linearized Euler's Equations , 2000 .

[56]  R. K. Amiet,et al.  Acoustic radiation and surface pressure characteristics of an airfoil due to incident turbulence , 1976 .

[57]  David A. Conner,et al.  Tiltrotor Aeroacoustic Code (TRAC) Predictions And Comparison With Measurements , 2000 .

[58]  Craig L. Streett,et al.  Investigation of Volumetric Sources in Airframe Noise Simulations , 2004 .

[59]  K. S. Brentner,et al.  Prediction of Helicopter Rotor Discrete Frequency Noise - A Computer Program Incorporating Realistic , 1986 .

[60]  D. L. Hawkings,et al.  Sound generation by turbulence and surfaces in arbitrary motion , 1969, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[61]  D. Stanescu,et al.  Computation of Engine Noise Propagation and Scattering off an Aircraft , 2003 .

[62]  M. S. Howe.  A review of the theory of trailing edge noise , 1978 .

[63]  K. Tang,et al.  Numerical Simulation of Flow-Induced Noise by Means of the Hybrid Method with LES and Aeroacoustic Analogy , 2006 .