This paper describes continued development and validation of a semi-empirical model of the aerodynamic noise generated by aircraft landing gears at approach. The model has been developed with Airbus funding over a number of years

1,2 , but recent studies carried out as part of the EC funded SILENCER project have led to the introduction of a number of new effects that occur on aircraft in flight. The core of the noise model is based on nondimensional source spectra derived from a database of full-scale tests on landing gears installed in the DNW wind tunnel. The new installation effects have been derived using the results of small-scale model tests 3 and by analysis of flight test data 4 . The model is used to examine differences between the performance of noise control fairings installed on a landing gear in a wind tunnel and similar fairings installed on a real aircraft in flight.

[1]  Fei Li,et al.  High Resolution Calculation of a Simplified Landing Gear , 2004 .

[2]  M. Lighthill.  On sound generated aerodynamically I. General theory , 1952, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

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

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

[5]  Stefan Oerlemans,et al.  An Experimental Study of Gear Wake/Flap Interaction Noise , 2004 .

[6]  W. Dobrzynski,et al.  Landing gears aerodynamic interaction noise , 2004 .

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

[8]  Werner Dobrzynski,et al.  Prediction of low noise aircraft landing gears and comparison with test results , 2006 .

[9]  D. A. Bies,et al.  AERODYNAMIC NOISE GENERATION BY A STATIONARY BODY IN A TURBULENT AIR STREAM , 1997 .

[10]  Kenji Takeda,et al.  Computational aeroacoustic simulations of leading-edge slat flow , 2004 .

[11]  Sebastien Guerin,et al.  Airframe noise characteristics from flyover measurements and prediction , 2006 .

[12]  Malcolm Smith,et al.  Validation of a prediction model for aerodynamic noise from aircraft landing gear , 2002 .

[13]  Yueping Guo.  A Semi-Empirical Model for Aircraft Landing Gear Noise Prediction , 2006 .

[14]  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.