Search Results for “activation energy” – Collected book of scientific-technical articles https://journal.yuzhnoye.com Space technology. Missile armaments Wed, 06 Nov 2024 11:40:32 +0000 en-GB hourly 1 https://journal.yuzhnoye.com/wp-content/uploads/2020/11/logo_1.svg Search Results for “activation energy” – Collected book of scientific-technical articles https://journal.yuzhnoye.com 32 32 11.2.2018 Some Peculiarities of Ensuring LRE Guarantied Service Life in the Conditions of Replacement of Components of Interindustry Application https://journal.yuzhnoye.com/content_2018_2-en/annot_11_2_2018-en/ Thu, 07 Sep 2023 11:32:42 +0000 https://journal.yuzhnoye.com/?page_id=30768
Key words: isotropic pyrographite , accelerated environmental tests , fluoroplastic , equivalent storage temperature , activation energy Bibliography: 1. isotropic pyrographite , accelerated environmental tests , fluoroplastic , equivalent storage temperature , activation energy .
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11. Some Peculiarities of Ensuring LRE Guarantied Service Life in the Conditions of Replacement of Components of Interindustry Application

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine

Page: Kosm. teh. Raket. vooruž. 2018 (2); 94-100

DOI: https://doi.org/10.33136/stma2018.02.094

Language: Russian

Annotation: The article considers the present-day aspects of predicting and establishing the guaranteed service life of liquid rocket engines. The phases and sequence of works to specify the guarantee periods are presented. The physical ground for determining thermal ageing test modes and increased humidity test modes is set forth. The mathematical dependencies are given to determine the time of testing at increased temperature, increased relative humidity, equivalent article storage temperature. The generalized list and sequence of tests to establish a guarantee period are set forth. The content of works is considered to seek for and introduce new components of inter-industry application, in particular, replacing materials for rubber mixtures during production of rubber technical goods, polymer materials (fluoroplastics, polyamides), isotropic pyrographite, ozone friendly means for degreasing liquid rocket engine assemblies being in contact with propellant component – oxygen and to seek for alternative bearings.

Key words: isotropic pyrographite, accelerated environmental tests, fluoroplastic, equivalent storage temperature, activation energy

Bibliography:
1. Vasilina V. G. et al. Autonomous Development Testing of LRPS Pneumohydraulic Supply Systems and Units. Kharkiv, 2005. 113 p.
2. Shaposhnikov V. A., Utkin V. F., Belyayev N. M. Evaluation of Rockets Guaranteed Service Life. М., 1967. 164 p.
3. GOST 9.707-81. Unified System of Corrosion and Ageing Protection. Polymer Materials. Methods of Accelerated Climatic Ageing Tests. М., 1990. 79 p.
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11.2.2018 Some Peculiarities of Ensuring LRE Guarantied Service Life in the Conditions of Replacement of Components of Interindustry Application
11.2.2018 Some Peculiarities of Ensuring LRE Guarantied Service Life in the Conditions of Replacement of Components of Interindustry Application
11.2.2018 Some Peculiarities of Ensuring LRE Guarantied Service Life in the Conditions of Replacement of Components of Interindustry Application

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7.1.2023 Specificity of using rubbers as structural materials for making connector assemblies of temperature conditioning systems https://journal.yuzhnoye.com/content_2023_1-en/annot_7_1_2023-en/ Fri, 12 May 2023 16:10:58 +0000 https://test8.yuzhnoye.com/?page_id=26991
For separation systems with increased requirements to external actions and cleanliness, authors developed a shear explosive bolt or pyrobolt, divided into parts, cutting the body walls in segments, which are set in motion by action of the pressure of gases, released as a result of pyrocartridge activation. Vibration impulsive loading during pyromixture combustion is reduced by optimization of explosive quantity, finding its minimum to provide the reliable activation of the device. To reduce the impact on the explosive bolt elements and shock front interface the rubber gasket is installed in the path of shock wave distribution, partially disseminating and absorbing its kinetic energy.
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7. Specificity of using rubbers as structural materials for making connector assemblies of temperature conditioning systems

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine1; State Enterprise DINTEM Ukrainian Research Design-Technological Institute of Elastomer Materials and Products2

Page: Kosm. teh. Raket. vooruž. 2023 (1); 63-69

DOI: https://doi.org/10.33136/stma2023.01.063

Language: Ukrainian

Annotation: Explosive bolts are widely used as actuating devices in the spacecraft separation systems. Explosive bolt body is divided into parts as a result of engagement of the pyromixture placed inside. Activated explosive bolts have negative mechanical effect on the interface elements and sensitive electronic devices installed nearby owing to explosive behavior of the pyromixture combustion, generating shock front with high pressure and velocities, impacts and collisions of the structural units. Cumulative effect of the above factors on the separated objects is called pyroshock. For separation systems with increased requirements to external actions and cleanliness, authors developed a shear explosive bolt or pyrobolt, divided into parts, cutting the body walls in segments, which are set in motion by action of the pressure of gases, released as a result of pyrocartridge activation. The basic sources of pyroshock for these shear explosive bolts with segments are: combustion of pyromixture, internal impacts of structural units against the bolt body; cutting of body wall in segments, release of preliminary deformed interface after activation. Structural solutions are presented to reduce the pyroshock per each of the components. Vibration impulsive loading during pyromixture combustion is reduced by optimization of explosive quantity, finding its minimum to provide the reliable activation of the device. To reduce the impact on the explosive bolt elements and shock front interface the rubber gasket is installed in the path of shock wave distribution, partially disseminating and absorbing its kinetic energy. Damper, made of easily deformable aluminum alloy, is also installed to decrease the internal impact of the rod against the explosive bolt body. Functional testing of the device, using the pendulum suspension and measuring separation speed and vibration impulsive loading, showed that body parts of the shear explosive bolt with segments are separated without significant impact loads and discharge of high-temperature gases and debris, providing reliable separation of compartments and units without damaging the sensitive equipment. Obtained values of the mechanical momentum, I = 0,4÷0,7 N•s and shock load spectrum – g-load 1950 g at the frequency range up to 5000 Hz, meet the up-to-date requirements to pyrotechnical devices.

Key words: explosive bolt, pyroshock, shock wave, pyrocartridge, high-temperature gases, damper

Bibliography:
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2. Bigun S. A., Khorolskiy M. S. Problemnye voprosy sozdania uzlov stykovki system termostatirovania raket kosmicheskogo naznachenia. Kosmicheskaya technika. Raketnoe vooruzhenie. Space technology Missile armaments: sb. nauch.-techn. st. GP «KB «Yuzhnoye». Dnepropetrovsk, 2013. Vyp. 2. S. 132-138.
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4. Pat. Frantsii №2685903 (А1), 1993, MPK kl В64G 5/00; F41F3/055; F02K9/44.
5. Pat. Rossiyskoi Federatsii №2473003-S1, 2011 r., MPK7F16L 37/20.
6. Yrtsev L. N., Bukhin B. L. Rezina kak konstruktsionniy material. Bolshoy spravochnik rezinschika. V dvuh chastyah. Ch. 1. Kauchuki i ingredienty. Pod red. S. V. Reznichenko, Yu. L. Morozova. M., 2012. 744 s.
7. GOST 263-75. Rezina. Metod opredelenia tverdosti po Shoru A (s izmeneniyami № 1, 2, 3, 4). M., 1989. 10 s.
8. Koshelev F. F., Kornev A. Ye., Bukanov A. M. Obschaya technologia reziny. Izd. 4-e, pererab. i dop. M., 1978. 528 s.
9. Skokov A. I., Kaplun S. V., Bogutskaya Ye. A., Khorolskiy M. S., Bigun S. A. Technologicheskie aspekty sozdaniya rukavov stykovki system termostatirovania raket-nositeley. Kosmicheskaya technika. Raketnoe vooruzhenie: sb. nauch.-techn. st. GP «KB «Yuzhnoye». Dnepropetrovsk, 2015. Vyp. 1. S. 42-45.
10. Bigun S. A., Yevchik V. S., Khorolskiy M. S. O vybore materialov dlya sozdaniya rukavov stykovki system termostatirovania sovremennyh RKN. Kosmicheskaya technika. Raketnoe vooruzhenie. Space technology Missile armaments: sb. nauch.-techn. st. GP «KB «Yuzhnoye». Dnepr, 2018. Vyp. 1. S. 72-84. https://doi.org/10.33136/stma2018.01.072
11. Pat. Ukrainy № 120445, 2019 r., В64G 5/00, В64G 1/40, F16L 37/08, F41F 3/055, F16L 33/00.
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14. Bigun S. A., Khorolskiy M. S. i dr. Eksperimentalnye issledovania rezultatov otrabotki uzlov stykovki system termostatirovania RKN «Tsiklon-4». Kosmicheskaya technika. Raketnoe vooruzhenie: sb. nauch.-techn. st./ GP «KB «Yuzhnoye». Dnepropetrovsk, 2016. Vyp. 2. S. 43-51.

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7.1.2023 Specificity of using rubbers as structural materials for making connector assemblies of temperature conditioning systems
7.1.2023 Specificity of using rubbers as structural materials for making connector assemblies of temperature conditioning systems
7.1.2023 Specificity of using rubbers as structural materials for making connector assemblies of temperature conditioning systems

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