Physical modeling and computer software for acoustic ecology problems

Abstract

In the report physical modeling and the computer system for acoustic ecology problems based on it are presented. An investigation of acoustic fields and modeling of wave propagation in the case of media with a complex heterogeneous structure has been carried out. Both dissipation and nonhomogeneities were considered. In a particular case of soil, models were formulated and their computer analysis, including the problem of acoustic waves propagation, was carried out. Both bulk and shift waves were taken into account. Several types of elastic shells as the sources, merged in soil, were considered (including particular cases with realistic parameters of underground transport tunnel inner). Numerous measurements on the ground were carried out for the verification of proposed models. Computer realizations of described technology for acoustic and geophysics fields analysis have been obtained. In particular a software package for analysis of vibration and acoustic situation on the ground surface and estimations of possible measures for vibration reduction is proposed. A new combined digital-analytic method for physical problems investigation has been used. It is based on the adaptive expansions of considered functions in an adjustable orthogonal function basis. Obtained results were applied for modeling of the vibration field from underground railways and ground surface building operations.