Imitation modeling of aviation source formation and sound distribution process
The problems of assessment, analysis and forecasting of the acoustic mode, built-up areas, which are exposed to the adverse effects of the aviation source noise are considered. A simple integral method of acoustic calculation of the sound fields of the aviation source using the developed simulation model representing the noise formation and spreading of this source for the acoustic calculation of its sound fields is proposed. The well-known principles of applied acoustics are used, on its base, within the framework of the initial boundary conditions of the energy theory of sound, possible aspects of performing acoustic calculation of the aviation source sound fields based on its proposed simulation model of noise formation and spreading on the ground. The results of practical usage of the proposed sound field calculation method for the approximate assessment of maximum and equivalent (L<sub>Ri</sub> (<sub>Amax</sub>), L<sub>Ri (Aeq.)</sub>) aircraft noise levels with a distance (Ri) in aerodrome areas are described. Also, on the basis of such initial data as sound levels (sound pressure) in its occurrence source (L<sub>0</sub>), and required sound levels in objects of protection (L<sub>Ri</sub>), considering the geometric parameters of the source itself, the numerical values of the distances R<sub>i</sub>) are determined from, actually, a source to objects of protection. Practical examples of acoustic calculation are given, conclusions on the method suitability for a preliminary, operational, indicative quantification of the expected values of the aircraft noise at the studied objects of protection are made. The implementation of the method by the computer program AcousticLab is shown below.