Visualization of acoustic radiation from the rocket propulsion system in the first seconds of the launch

1Sokol, GI, 1Nekrasov, VE, 1Kirichenko, SYu., 1Mironenko, ES, 1Khorishchenko, AA
1Oles Honchar National University of Dnipropetrovsk, Dnipro, Ukraine
Space Sci. & Technol. 2019, 25 ;(4):36-40
Publication Language: Russian
An important factor in determining the impact of noise on the environment at the moment of the space rocket launch is the compilation of a technique for calculating sound pressure levels. At the stage of the preliminary design of a rocket carrier, the energy and structural data of the rocket are already known. The main source of noise is the propulsion system of the rocket. With known acoustic characteristics, visualization of noise propagation in the environment can be visualized.
        When solving this problem, we use mathematical modeling in the framework of linear acoustics, Fourier series, Fortran software, MathCad. Shown32 is used to visualize data of the calculation. The program calculates the sound pressure p in decibels at a point located at a distance r from the radiation source and at an angle to the source θ. Visualization of calculated data requires their conversion into a format used in Shown32. Initially, the grid parameters, the maximum, minimum values, and the number of divisions along the axes are set. Further, the number of nodes is calculated. Calculation of the sound pressure in the Fortran software package is performed in the polar coordinate system as the dependence of the pressure on the distance and the polar angle. The visualization in Shown32 requires the Cartesian coordinate system. Grid cells are selected in the form of quadrilateral polygons. The program then determines the cell vertices. An operator is created that allows printing data. Displayed parameters are assigned notation. In this case, these are the sound pressure levels in decibels. The distribution pattern of the sound pressure levels is represented by a color scale
Keywords: acoustic radiation, movement installation, rocket, Shown32, visualization
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