TY - JOUR AU - Zagrevskyi, E. O. AU - Sokol, G. I. PY - 2023/02/23 Y2 - 2024/03/28 TI - ACOUSTIC RADIATIONS OF A CYLINDRICAL FORM AT THE LAUNCH OF A ONE-NOZZLE ROCKET JF - Journal of Rocket-Space Technology JA - Rocket-Sp. Tech. VL - 30 IS - 4 SE - Applied mechanics and mathematical methods DO - 10.15421/452214 UR - https://rocketspace.dp.ua/index.php/rst/article/view/148 SP - 107-115 AB -  When space rockets are launched, acoustic fields of various types of radiation appear in the atmosphere. Therefore, it is necessary to identify the features and determine the directions of research of acoustic radiation. The purpose of this work is to develop a methodology for studying cylindrical acoustic radiation at the launch of a one-nozzle rocket for space purposes in the first seconds of flight. At the same time, the following tasks are solved: development of physical models of acoustic fields; determination of types of acoustic sources; identification of sources of acoustic vibrations during rocket movement; calculation of sound pressure levels at specified points of the acoustic field. The calculation of the amplitude of acoustic pressure in the medium that surrounds a one-nozzle space rocket is performed. On the basis of the calculation results, the dependence of the lifting height of a one- nozzle space rocket on the flight time is constructed. In this paper, analytical methods based on those already known in acoustics will be used to compile a methodology for calculating the characteristics of acoustic fields, since methods for calculating the amplitude-frequency characteristics of acoustic radiation during rocket launches are not developed for all cases. The task of creating a methodology for calculating acoustic characteristics at the launch of a one-nozzle rocket for space purposes in the first seconds of flight is solved in a linear formulation. A simplified engineering methodology based on equations from acoustic sources and fields has been developed. The technique is used to calculate sound pressure levels in the far acoustic field, when the jet from the nozzle can be approximated by a cylindrical type emitter. It is found that the sound pressure level in the medium will not exceed the value of 144 dB. Based on the results of the physical and mathematical analysis of the sources of acoustic vibrations and their fields, which is shown in this work, at the stage of preliminary design and further development of the technique, it is possible to develop active and passive methods of damping acoustic vibrations. ER -