More and more attention is being paid to the impact of industry on the environment and people’s surroundings. One type of pollution is the noise that is generated by technological apparatus. It is necessary to develop new tools that will be able to survey noise in large industrial areas. This paper presents a concept of using unmanned aerial vehicles to generate acoustic maps of a surveyed area. One of the tools that is required for this purpose is aerial photogrammetry, which is used to generate a numerical terrain model from a series of photographs. The methodology and results of the simulation study of the effect of the data-acquisition-process parameters (flight altitude and transverse and longitudinal overlay levels of images) on the quality of the generated numerical terrain model and the generating time are presented in this paper.
This paper presents the concept and results of initial simulations of an acoustic system for absolute pressure measurement. Its working principle is based on a coupling between the flow and acoustic fields. The measurement is performed indirectly. The measurement of absolute pressure is based on measuring the velocity and time of arrival of an acoustic wave and the relationship between the pressure and speed of sound in a given medium. The concept was verified numerically using the finite volume method and the OpenFOAM environment. One possible application of the system is to measure the mean pressure on the walls of buildings.
