Aerodynamic Noise Generation, Suppression and Control (Aerodynamic Noise Ge)

Venue: CISMM, Udine, Italy

Location: Udine, Italy

Event Date/Time: Sep 07, 2009 End Date/Time: Sep 11, 2009
Registration Date: Sep 04, 2009
Early Registration Date: Jul 27, 2009
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Aeroacoustics is one of the most challenging domains of Fluid Dynamics. A very accurate knowledge of the mechanisms of aerodynamic noise generation is required to satisfy current regulatory requirements in fields as varied as transport (airplanes and road vehicles) and safety (noise in the working environment, vibration induced mechanical fatigue). The aim of this Lecture Series is to present a state-of-the-art review of on-going activities in noise prediction and to indicate current research directions in a way that is accessible to attendees coming from both academic and industrial areas. Introductory lectures on the fundamentals of aeroacoustics will be followed by up-to-date reviews on theoretical developments, experimental techniques and numerical modeling in other topics of aeroacoustics from noise generation to noise propagation and noise control. The principal components determining the noise of a modern passenger aircraft as a whole are fan and turbine noise, jet noise and airframe noise. Since all the above sources of aerodynamic noise turn out to be important at different flight stages, the challenging goal of aircraft noise reduction requires assuming each source noise reduction. It is necessary to know concrete radiation mechanisms for developing the methods of noise control, numerical methods of noise prediction etc. These coupled problems are considered in the course. The proposed course will have a short introduction into the topic, emphasising the foundations of nonlinear acoustics and aeroacoustics. These lectures will introduce the physics basis of aerodynamic noise from the viewpoint of nonlinear wave physics. They would also cover nonlinear phenomena generated at the boundary and in the volume of media. One series of lectures will be dedicated to problems of high-power noise generation in the atmosphere; interaction of high-intense modulated acoustic waves; shocks formation and the broadening of spectrum towards the high-frequency region; evolution of aerodynamic noise spectrum. Another part of the course will deal with modern theoretical approaches used for nonlinear acoustic wave propagation. The lectures are focused on basic problems of nonlinear acoustic wave propagation. An overview will be given on for propagation of nonlinear diffusive acoustic waves; behavior of short pulses and periodic waves far from the sound source; noise from traffic, fans, motors etc. and a noise barrier. Another part of the course will deal with the supersonic passenger transport and sonic boom impact. Acoustic engineering for applications will illustrate the capabilities of different approaches, allowing an evaluation of their performance and an assessment of their applicability in various fields of research. The main objective of this course is therefore to allow an information transfer between well-known scientists, leaders in the aeroacoustics field, and industries and laboratories.


Piazza Garibaldi 18

Additional Information

Coordinator: Efim Kudashev (Space Research Institute, Moscow, Russia)