Improving the Safety of TPP and NPP Thermal Power Equipment through Noise Reduction Using Acoustic Barriers with Modified Top Edge

Abstract

The paper provides data based on an analysis of the results of mathematical modeling in COMSOL Multiphysics software, which allow to determine the acoustic efficiency of a noise barrier with cylindrical top device depending on the height of the barrier, the diameter of the device and the position of the cylindrical device relative to the top edge of the barrier. It was determined that a higher barrier increased the length of interference region (the region of local maxima and minima of the top device efficiency) and significantly affects the acoustic efficiency of the top device at octave bands of 250, 500, 1000 and 2000 Hz. The cylindrical device with the installation angle α_inst = 90° was found to be the most efficient for a constant distance of 5 m from the noise source to the barrier in all cases. It is shown that the acoustic efficiency of the top device with different angles remains almost constant when the barrier height is increased from 1 to 2 m. When the barrier height was increased to between 3 and 5 m, the acoustic efficiency of the device increased by about 2 dBA. The acoustic efficiency of the cylindrical device was found to increase by 2 or 3 dBA on average as the top device diameter increased from 0.2 to 0.5 m.