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Acoustic problems of rocket launch Authors: Hrinchenko V. 2020, (1); 155-159 DOI: https://doi.org/10.33136/stma2020.01.155 Language: Russian Annotation: Due to an increase of power of rocket engines, the high intensity sound field generated by the exhaust jets have become an important factor, which determines the success rate of a rocket launch. Identification and definition of acoustic sources structure within a complex supersonic jet, being a one of the most important scientific problems, which have to be solved to find the ways to control accoustic radiation. A three components of acoustic sources can be defined here – broadband signals from large and small components of of turbulent jet and tonal signals which usually being overlooked during the estimation of overall sound pressure level.
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17. Acoustic problems of rocket launch

Authors:

Hrinchenko V. T.

Organization:

Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine

Page: Kosm. teh. Raket. vooruž. 2020, (1); 155-159

DOI: https://doi.org/10.33136/stma2020.01.155

Language: Russian

Annotation: Due to an increase of power of rocket engines, the high intensity sound field generated by the exhaust jets have become an important factor, which determines the success rate of a rocket launch. Ensuring a successful launch of a rocket system became harder due to new engineering problems. Identification and definition of acoustic sources structure within a complex supersonic jet, being a one of the most important scientific problems, which have to be solved to find the ways to control accoustic radiation. A three components of acoustic sources can be defined here – broadband signals from large and small components of of turbulent jet and tonal signals which usually being overlooked during the estimation of overall sound pressure level. The paper considers various aspects of acoustics of the launch of rocket systems, which includes characteristics of acoustic sources in supersonic jets, possibilities and physical limitation factors, under which it is possible to control the sound radiation. Among the possible ways to control the process of sound generation by a jet, a method of water injection in a jet is being studied. While saving the general thrust of the engine this method can not greatly reduce the sound radiation by a jet. It is recommended to use big amounts of water-air mix to protect the launch pad from damage. Significant progress on the topic of understanding the process of sound generation by supersonic jets can be achieved via mathematical modeling of sound radiation. The latest achievements of mathematical modeling of sound generation by supersonic jets being presented.

Key words: Acoustics of rocket launch, acoustic efficiency of a jet, semi-empirical models of of jet acoustics, numeric-computational methods in aeroacoustics, control of jet-generated acoustic levels

Bibliography:
1. Lighthill M. J. On Sound Generated Aerodynamically: I. General Theory. Proc. Roy. Soc. London Ser. A, 211. 1952. Р. 564–581. https://doi.org/10.1098/rspa.1952.0060
2. Tam C. K. W. Jet noise. Theoretical Computftional Fluid Dynamics. 1998. No 10. Р. 393–405. https://doi.org/10.1007/s001620050072
3. Lubert C. P. Sixty years of launch vehicle acoustics. Proc.Mtgs.Acoust. Vol. 31. 2017. https://doi.org/10.1121/2.0000704
4. Ask the Astronaut: What does launch feel like? URL: https://www.airspacemag. com/ask-astronaut/ask-astronaut-what-does-launch-feel-what-thoughts-and-emotions-run-through-your-mind-180959920/
5. Tim P. Ask an Astronaut: My Guide to Life in Space. 2018. 272 p.
6. Saucer B. What’s the Deal with Rocket Vibration? MIT Technology Review. July 15, 2009. URL: https://www.technology-review.com/s/414364https:/whats-the-deal-with-rocket-vibrations/
7. Ross D. Mechanics of Underwater noise. 1976. 266 p.
8. Varnier J. Experimental study and simulation of rocket engine free jet noise. AIAA J. 2001. Vol. 39, Nо 10. P. 1851–1859. https://doi.org/10.2514/2.1199
9. Eldred K. M. Acoustic loads generated by the propulsion system. NASA SP-8072, 1971. 49 p.
10. Balakrishnan P., Srinivason K. Impinging get noise reduction using non-circular jets. Applied Acoustics. 2019. Vol. 143. Р. 19-30. https://doi.org/10.1016/j.apacoust.2018.08.016
11. Tsutsumi S. Acoustic generation mechanism of a supersonic jet impinging on deflectors / S. Tsutsumi, R. Takaki, Y. Nakanishi, K. Okamoto, S. Teramoto 52th AIAA Aerospace Sci. Meet. AIAA Pap. 2014-0882. 2014. 12 p. https://doi.org/10.2514/6.2014-0882
12. Ahuja K. K., Manes J. P., Massey K. C., Calloway A. B. An Evaluation of various concepts of Reducing Supersonic Jet Noise, AIAA-90-3982. AIAA 13th Aeroacoustic Conference, 1990. Р. 1-21. https://doi.org/10.2514/6.1990-3982
13. Krathapalli A., Lenkatakrishnan L., Elovarsan R., Laurenco L. Supersonic Jet Noise Suppression by Water Injection. AIAA 2000-2025. 6th AIAA/CEAS Aeroacoustic Conference, 2000. Р. 1-25.
14. Moratilla-Vega M. A., Lackhole K., Janicka J., Xia H., Page C. J. Jet Noise Analysis using an Efficient LES/ High-Order Acoustic Coupling Method. Computer and Fluid. 2020. https://doi.org/10.1016/j.compfluid.2020.104438

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]]> 7.1.2018 Prospective Gas Purification Device for LRE Test Bench https://journal.yuzhnoye.com/content_2018_1-en/annot_7_1_2018-en/ Tue, 05 Sep 2023 06:22:22 +0000 https://journal.yuzhnoye.com/?page_id=30456
Calculation and Measurement of Characteristics of Noise Created in Far Acoustic Field by Jet Aircraft / Under the editorship of L.
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7. Prospective Gas Purification Device for LRE Test Bench

Authors:

Sheiko А. F., Petrenko I. P., Dneprov P. Е., Ivanov S. А.

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine

Page: Kosm. teh. Raket. vooruž. 2018 (1); 39-45

DOI: https://doi.org/10.33136/stma2018.01.039

Language: Russian

Annotation: The paper considers the project of prospective integrated gas purification device for large-sized LRE test stand. The prognostic mathematical models are presented for evaluation of ecological indices of the integrated gas purification equipment.

Key words:

Bibliography:
1. Sokolov E. Y., Zinger N. M. Jet Devices. 3rd edition, revised. М., 1989. 352 p.
2. Abramovich G. N. Applied Gas Dynamics. In 2 parts. Part 1: Study guide for technical universities. 3rd edition, revised and enlarged. М., 1991. 600 p.
3. MODELING OF CHEMICAL AND PHASE EQUILIBRIUMS AT HIGH TEMPERATURES (ACTPA.4 рс). Version1:16. Description of Use. М., 1996. 51 p.
4. Gusev N. G., Belyayev V. A. Radioactive Emissions in Biosphere. М., 1991. 255 p.
5. Noise Control in Industry: Guide / Under the general editorship of E. Y. Yudin. М., 1985. 400 p.
6. Calculation and Measurement of Characteristics of Noise Created in Far Acoustic Field by Jet Aircraft / Under the editorship of L. I. Sorokin. М., 1968. 100 p.
7. GOST 31295.2-2005. Noise. Sound Attenuation at Propagation on Terrain. P. 2. General Calculation Method. 35 p.

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7.1.2018 Prospective Gas Purification Device for LRE Test Bench
7.1.2018 Prospective Gas Purification Device for LRE Test Bench
]]> 10.1.2019 Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off https://journal.yuzhnoye.com/content_2019_1-en/annot_10_1_2019-en/ Thu, 25 May 2023 12:09:56 +0000 https://journal.yuzhnoye.com/?page_id=27715
Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off Authors: Batutina T. 2019, (1); 72-75 DOI: https://doi.org/10.33136/stma2019.01.072 Language: Russian Annotation: The semi-empirical technique of evaluation of external acoustic loads during lift-off is a modification of the known NASA SP-8072 technique based on empirically determined universal dependencies of jet section acoustic power on normalized coordinate and frequency (Strouhal number).
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10. Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off

Authors:

Batutina T. Y.1, Bondar’ D. S.1, Hrinchenko V. T.2, Oliinyk V. N.2

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine1; Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine2

Page: Kosm. teh. Raket. vooruž. 2019, (1); 72-75

DOI: https://doi.org/10.33136/stma2019.01.072

Language: Russian

Annotation: The semi-empirical technique of evaluation of external acoustic loads during lift-off is a modification of the known NASA SP-8072 technique based on empirically determined universal dependencies of jet section acoustic power on normalized coordinate and frequency (Strouhal number). The proposed technique was updated in respect of evaluation of mechano-acoustic effectiveness of supersonic jet, determination of spatial scale of sound generating zone in jet, and formation of sound radiation direction towards rocket’s head module. A detailed presentation of the sequence of solving the task set is provided. A comparative analysis of the NASA SP-8072 technique and the proposed modification is made.

Key words: LV lift-off, supersonic jet, sound generation, sound generating zone scale, sound waves direction

Bibliography:

1. Eldred K. M. Acoustic loads generated by the propulsion system / K. M. Eldred. NASA SP-8072, 1971. 49 p.
2. Koudriavtsev V. A simplified model of jet aerodynamics and acoustics / V. Koudriavtsev, J. Varnier, A. Safronov // 10th AIAA/CEAS Aeroacoust. Conf. AIAA Pap. 2004-2877, 2004. 13 p. https://doi.org/10.2514/6.2004-2877
3. Haynes J. Modifications to the NASA SP-8072 Distributed Source Method II for Ares I lift-off environment predictions / J. Haynes, J. Kenny // 15th AIAA/CEAS Aeroacoust. Conf. AIAA Pap. 2009-3160, 2009. 12 p. https://doi.org/10.2514/6.2009-3160

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10.1.2019 Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off
10.1.2019 Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off
10.1.2019 Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off

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]]> 9.1.2019 Modeling of Cyclone-4M Rocket Jet Acoustic Emission by Volumetric Source https://journal.yuzhnoye.com/content_2019_1-en/annot_9_1_2019-en/ Thu, 25 May 2023 12:09:50 +0000 https://journal.yuzhnoye.com/?page_id=27714
2019, (1); 64-71 DOI: https://doi.org/10.33136/stma2019.01.064 Language: Russian Annotation: During lift-off of integrated launch vehicles, the propulsion system jet generates acoustic field. To take into account the effects on these elements, it is necessary to determine the characteristics of generated acoustic field. The method was developed that allows modeling the acoustic fields during integrated launch vehicle lift-off based on determination of acoustic sources type. The modeling of integrated launch vehicle propulsion system (ILV PS) jet acoustic field as bulky radiation source was performed in the rocket flight leg where ILV ascent altitude does not exceed ~ 25 m. The characteristics of acoustic fields sound pressure levels were calculated depending on radiation frequency taking into account environmental temperature. Key words: integrated launch vehicle , acoustic field , sound pressure Bibliography: 1. integrated launch vehicle , acoustic field , sound pressure .
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9. Modeling of Cyclone-4M Rocket Jet Acoustic Emission by Volumetric Source

Authors:

Sirenko V. M.1, Sokol G. I.2, Savchuk V. M.1, Kotlov V. Y.2, Savchuk T. L.2

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine1; Oles Honchar Dnipro National University, Dnipro, Ukraine2

Page: Kosm. teh. Raket. vooruž. 2019, (1); 64-71

DOI: https://doi.org/10.33136/stma2019.01.064

Language: Russian

Annotation: During lift-off of integrated launch vehicles, the propulsion system jet generates acoustic field. Therewith, the loads can be created that are critical for the launching equipment, rocket body and especially for the spacecraft, which are under the fairing. To take into account the effects on these elements, it is necessary to determine the characteristics of generated acoustic field. The method was developed that allows modeling the acoustic fields during integrated launch vehicle lift-off based on determination of acoustic sources type. In particular, modeling of Cyclone-4M ILV jet acoustic radiation by bulky source was performed. This provided the possibility to calculate acoustic pressure amplitudes in ILV ambient medium and to evaluate acoustic effect on the rocket body at certain points. The method is expected to be used to investigate kR wave parameter. The modeling of integrated launch vehicle propulsion system (ILV PS) jet acoustic field as bulky radiation source was performed in the rocket flight leg where ILV ascent altitude does not exceed ~ 25 m. In this case, one should be based on the value of boundary frequency fb =150 Hz which separates two types of acoustic field: fb ˂ 150 Hz – front of acoustic wave of spherical type, fb > 150 Hz – front of acoustic wave of flat type. The algorithm and program of calculation of sound pressure levels were developed in JAVA language. The characteristics of acoustic fields sound pressure levels were calculated depending on radiation frequency taking into account environmental temperature. The maximal acoustic pressure level in 150 Hz frequency in the payload area outside the fairing – 155 dB, in the instrumentation bay area – 157 dB, in the intertank bay area – 172 dB, in the aft bay area – 182 dB. In the frequencies lower than 150 Hz, the sound pressure levels are lower. The calculation data are presented graphically.

Key words: integrated launch vehicle, acoustic field, sound pressure

Bibliography:

1. Dementiev V. K. O maximalnykh akusticheskykh nagruzkakh na rekety pri starte/ V. K. Dementiev, G. Ye. Dumnov, V. V. Komarov, D.A. Melnikov// Kosmonavtika I raketostroenie. 2000. Vyp. 19. P. 44-55.
2. Tsutsumi S., Ishii T., Ut K., Tokudone S., Chuuouku Y., Wado K. Acoustic Design of Launch Pad for Epsilon Launch Vehicle / Proceedings of AJCPP2014 . Asian Joint Conference on Propulsion and Power, March 5- 8, 2014, Jeju Island, Korea. AJCPP2014-090.
3. Panda J., Mosher R., Porter D.J. Identification of Noise Sources during Rocket Engine Test Firings and a Rocket Launch a Microphone Phased-Array // NASA / TM2013-216625, December 2013. P. 1-20.
4. Sokol G. I. Metod opredeleniya vida istochnikov akusticheskogo izlucheniya v pervye secundy starta raket kosmicheskogo naznacheniya/ G. I. Sokol// Systemne proektuvannya ta analiz characteristic aerokosmichoi techniki: Zb. nauk. pr. 2018. XXIV. Dnipro: Lira, 2018. P. 91-101.
5. Sokol G. I., Frolov V. P., Kotlov V. Yu. / Volnovoy parameter kak kriteriy v osnove metoda issledovaniya akusticheskikh istochnikov pro starte raket/ Aviatsionno-kosmicheskaya technika I technologia. 2018. 3 (147), May-June 2018. Kharkov: KhAI, 2018. P. 4-13. DОІ:http://doi.org /10.20535/0203- 3771332017119600.
6. Rzhevkin S. N. Kurs lektsiy po teorii zvuka/ S. N. Rzhevkin. M.: MGU, 1960. 261 p.
7. Tyulon V. N. Vvedenie v teoriyu izlucheniya I rasseyaniya zvuka / V. N. Tyulin. M.: Nauka, 1976. 253 p.
8. Sapozhkov M. A. Electroakustica/ M. A. Sapozhkov. M.: Svyaz, 1978. 272 p.
9. Grinchenko V. T., Vovk V. V., Matsipura V. T.. Osnovy akustiki. Kyiv: Nauk. dumka, 2007. 640 p.
10. Ultrazvuk: Malaya enciclopedia. M.: Nauka, 1983. 400 p.
11. Volkov K. N. Turbulentnye strui – staticheskie modeli i modelirovanie krupnykh vikhrey/ K. N. Volkov, V. N. Emelyanov, V. A. Zazimko. M.: Fizmatlit, 2013. 960 p.
12. Schildt G. Java 8. Polnoe rukovodstvo. 9-e izd. M.: Wiliams, 2015. 137 p.

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9.1.2019 Modeling of Cyclone-4M Rocket Jet Acoustic Emission by Volumetric Source
9.1.2019 Modeling of Cyclone-4M Rocket Jet Acoustic Emission by Volumetric Source
9.1.2019 Modeling of Cyclone-4M Rocket Jet Acoustic Emission by Volumetric Source

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]]> 5.1.2019 Methodology of Normative Principles of Justification of Launch Vehicle Launching Facility Structures Lifetime https://journal.yuzhnoye.com/content_2019_1-en/annot_5_1_2019-en/ Thu, 25 May 2023 12:09:25 +0000 https://journal.yuzhnoye.com/?page_id=27710
Main achievements of Ukrainian scientists in the field of strength and life are specified, taking into account the specifics of various branches of technology. Developing strength standards and useful life calculation basis, it is advisable to use modern methods of engineering diagnostics, in particular, holographic interferometry and acoustic emission, and to develop the high-speed circuits of numerical procedures for on-line calculations when testing the designed systems. Key words: classification of loads and failures; shock wave , acoustic and thermal loads; low-cycle fatigue; hierarchical approach in classification; projection-iterative schemes of numerical procedur Bibliography: 1.
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5. Methodology of Normative Principles of Justification of Launch Vehicle Launching Facility Structures Lifetime

Authors:

Hudramovych V. S.1, Sirenko V. M.2, Klimenko D. V.2, Daniyev Y. F.1, Hart Ye. L.3

Organization:

The Institute of Technical Mechanics, Dnipro, Ukraine1; Yangel Yuzhnoye State Design Office, Dnipro, Ukraine2; Oles Honchar Dnipro National University, Dnipro, Ukraine3

Page: Kosm. teh. Raket. vooruž. 2019, (1); 28-37

DOI: https://doi.org/10.33136/stma2019.01.028

Language: Russian

Annotation: This article contains results of methodology and standards development for life prediction of launch site structures to launch various types’ launch vehicles into near-earth orbit. Launch sites have been built in various countries of the world (European Union, India, China, Korea, Russia, USA, Ukraine, France, Japan, etc.). In different countries they have their own characteristics, depending on the type and performance of the launch vehicles, infrastructure features (geography of the site, nomenclature of the space objects, development level of rocket and space technology), problems that are solved during launches, etc. Solution of various issues, arising in the process of development of the standards for justification of launch site life is associated with the requirement to consider complex problems of strength and life of nonuniform structural elements of launch sites and structures of rocket and space technology. Launch sites are the combination of technologically and functionally interconnected mobile and fixed hardware, controls and facilities, designed to support and carry out all types of operations with integrated launch vehicles. Launch pad, consisting of the support frame, flue duct lining and embedded elements for frame mounting, is one of the principal components of the launcher and to a large extent defines the life of the launch site. Main achievements of Ukrainian scientists in the field of strength and life are specified, taking into account the specifics of various branches of technology. It is noted that the physical nonlinearity of the material and statistical approaches determine the strength analysis of useful life. Main methodological steps of launch site structures life prediction are defined. Service limit of launch site is suggested to be the critical time or the number of cycles (launches) over this period, after which the specified limiting states are achieved in the dangerous areas of the load-bearing elements: critical cracks, destruction, formation of unacceptable plastic deformations, buckling failure, corrosion propagation, etc. Classification of loads acting on the launch sites is given. The useful life of launch site is associated with estimation of the number of launches. Concept of low and multiple-cycle fatigue is used. Developing strength standards and useful life calculation basis, it is advisable to use modern methods of engineering diagnostics, in particular, holographic interferometry and acoustic emission, and to develop the high-speed circuits of numerical procedures for on-line calculations when testing the designed systems.

Key words: classification of loads and failures; shock wave, acoustic and thermal loads; low-cycle fatigue; hierarchical approach in classification; projection-iterative schemes of numerical procedur

Bibliography:

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20. TEchnologicheskie obiekty nazemnoy infrastructury raketno-kosmicheskoy techniki: monografia/ Pod red. I. V. Barmina. M.: Poligrafiks RPK, 2005. Kn. 1. 412 p.; 2006. Kn. 2. 376 p.
21. Нudrаmоvich V. S. Соntact mechanics of shell structures under local loading/ International Аррlied Месhanics. 2009. Vol. 45, № 7. Р. 708– 729. https://doi.org/10.1007/s10778-009-0224-5
22. Нudrаmоvich V. Еlесtroplastic deformation of nonhomogeneous plates / I. Eng. Math. 2013. Vol. 70, Iss. 1. Р. 181–197. https://doi.org/10.1007/s10665-010-9409-5
23. Нudrаmоvich V. S. Mutual influence of openings on strength of shell-type structures under plastic deformation / Strenght of Materials. 2013. Vol. 45, Iss. 1. Р. 1–9. https://doi.org/10.1007/s11223-013-9426-5
24. Mac-Ivily A. J. Analiz avariynykh razrusheniy / Per. s angl. M.: Technosfera, 2010. 416 p.
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26. Mesarovich M. Teoria ierarkhicheskykh mnogourovnevykh system/ M. Mesarovich, D. Makho, I. Tohakara / Per. s angl. M.: Mir, 1973. 344 p.

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5.1.2019 Methodology of Normative Principles of Justification of Launch Vehicle Launching Facility Structures Lifetime
5.1.2019 Methodology of Normative Principles of Justification of Launch Vehicle Launching Facility Structures Lifetime
5.1.2019 Methodology of Normative Principles of Justification of Launch Vehicle Launching Facility Structures Lifetime

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]]> 12.2.2019 Procedure of acoustic loads measuring during the ILV launch https://journal.yuzhnoye.com/content_2019_2-en/annot_12_2_2019-en/ Mon, 15 May 2023 15:46:04 +0000 https://journal.yuzhnoye.com/?page_id=27214
Procedure of acoustic loads measuring during the ILV launch Authors: Batutina T. 2019, (2); 92-95 DOI: https://doi.org/10.33136/stma2019.02.092 Language: Russian Annotation: The paper considers the main aspects of acoustic loads measuring during the rocket launch as well as problem of staff, equipment and environment protection from destructive effect of noise, generated by rocket’s engine. Effective sanitary standards of noise safety were taken to define the duration and power of acoustic loads safe for the personnel.
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12. Procedure of acoustic loads measuring during the ILV launch

Authors:

Batutina T. Y., Bondar’ D. S.

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine

Page: Kosm. teh. Raket. vooruž. 2019, (2); 92-95

DOI: https://doi.org/10.33136/stma2019.02.092

Language: Russian

Annotation: The paper considers the main aspects of acoustic loads measuring during the rocket launch as well as problem of staff, equipment and environment protection from destructive effect of noise, generated by rocket’s engine. Proposed is the procedure of acoustic loads measurement and calculation of the minimal acoustic noise-safe launching rocket distance, at which it is safe to put equipment and operating personnel. This procedure is based on sharing of the numerical simulation of the exhaust jet in the ANSYS software system, engineering approaches in calculation of propagation and extinction of acoustic waves and measurement of the actual values of acoustic loads with the use of several noise meters. Effective sanitary standards of noise safety were taken to define the duration and power of acoustic loads safe for the personnel. As an example of use of this procedure, results of calculation of noise levels, provided by the sound attenuating chamber, and measurement data during the pulsed wind tunnel tests have been presented. As an outcome of calculations and measurements, done by the proposed procedure, outlines of the noise-safe zone were successfully defined and number of modifications suggested for the sound attenuating chamber to reduce the acoustic loads it generates.

Key words: Supersonic jet, calculation of acoustic loads, acoustic measurements, acoustic protection

Bibliography:
1. Opredelenie summarnogo urovnya shuma neskolkykh istochnikov. URL: http//studbooks.net/39077/bzhd/ opredelit_summarnyy_uroven_neskolkih_ istochnikov_shuma (data obrascheniya: 06.08.2017).
2. DSN 3.3.6.037-99. Sanitarni normy vyrobnychogo shumu, ultrazvuku ta infrazvuku.
3. Khekl M., Muller Kh. A. Spravochnik po tekhnicheskoy akustike. 1980. 438 s.

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12.2.2019 Procedure of acoustic loads measuring during the ILV launch
12.2.2019 Procedure of acoustic loads measuring during the ILV launch
12.2.2019 Procedure of acoustic loads measuring during the ILV launch

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]]> 8.2.2019 Evaluation of the external acoustic loads, acting on the rocket when it passes the leg with maximum velocity head https://journal.yuzhnoye.com/content_2019_2-en/annot_8_2_2019-en/ Mon, 15 May 2023 15:45:50 +0000 https://journal.yuzhnoye.com/?page_id=27210
Evaluation of the external acoustic loads, acting on the rocket when it passes the leg with maximum velocity head Authors: Batutina T. 2019, (2); 58-62 DOI: https://doi.org/10.33136/stma2019.02.058 Language: Russian Annotation: The article considers the procedure for evaluation of acoustic stressing parameters at the observation point nearby the launch vehicle nose cone when passing the sectors with maximum velocity heads and close to 1 Mach numbers.
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8. Evaluation of the external acoustic loads, acting on the rocket when it passes the leg with maximum velocity head

Authors:

Batutina T. Y.1, Bondar’ D. S.1, Hrinchenko V. T.2, Oliinyk V. N.1

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine1; Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine2

Page: Kosm. teh. Raket. vooruž. 2019, (2); 58-62

DOI: https://doi.org/10.33136/stma2019.02.058

Language: Russian

Annotation: The article considers the procedure for evaluation of acoustic stressing parameters at the observation point nearby the launch vehicle nose cone when passing the sectors with maximum velocity heads and close to 1 Mach numbers. And the problem is set to determine the overall sound pressure level and the corresponding levels in octave and 1/3-octave frequency bands. Procedure under consideration is based on the semi-empirical dependency of characteristics of the wideband aerodynamic noise, which occurs during the launch vehicle flight at high velocities due to the turbulent pressure fluctuations and dimensionless aerodynamic parameters of the main stream. General idea of this approach is to establish relation of the velocity heads with wall pressure fluctuations in the boundary layer, calculating shear stress (friction) on the shell surface based on relationships applicable in the boundary layer theory and engineering experience. Attempts of development of similar calculation models go back to the early efforts, dedicated to the study of the aeroacoustics of the launch vehicle in flight. Main advantages of the procedure are its simplicity and versatility since it can be used to determine the acoustic loads around the payload fairings of launch vehicles of different sizes and shapes within the wide range of flight velocities and altitudes.

Key words: Launch vehicle flight, Mach number, launch vehicle payload fairing, determination of sound pressure

Bibliography:
1. Raman K. R. A study of surface pressure fluctuations in hypersonic turbulent boundary layers. NASA CR-2386, 1974. 90 p. https://doi.org/10.2514/6.1973-997
2. Aviatsionnaya akustika/ pod red. A. G. Munina. М., 1986. Ch. 1. 248 s.
3. Aviatsionnaya akustika / pod red. A. G. Munina. М., 1986. Ch. 2. 264 s.
4. Kovalnogov N. N., Lukin N. M. Osnovy teorii i rascheta pogranichnogo sloya. Ulianovsk, 2000. 86 s.
5. Monin A. S., Yaglom A. M. Statisticheskaya hydromechanika. Mechanika turbulentnosti. M., 1965. Ch. 1. 640 s.
6. Vasiliev V. V., Morozov L. V., Shakhov V. G. Raschet aerodynamicheskykh characteristic letatelnykh apparatov. Samara, 1993. 78 s.
7. Yefimtsov B. M. Kriterii podobiya spektrov pristenochnykh pulsatsiy davleniy turbulentnogo pogranichnogo sloya. Acousticheskiy journal. 1984. T. 30, № 1. S. 58–61.

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8.2.2019 Evaluation of the external acoustic loads, acting on the rocket when it passes the leg with maximum velocity head
8.2.2019 Evaluation of the external acoustic loads, acting on the rocket when it passes the leg with maximum velocity head
8.2.2019 Evaluation of the external acoustic loads, acting on the rocket when it passes the leg with maximum velocity head

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