scholarly journals Small-size silencers for stub-barreled arms

2020 ◽  
Vol 2020 (4) ◽  
pp. 3-12
Author(s):  
O.V. Pylypenkо ◽  
◽  
N.A. Konovalov ◽  
V.I. Kovalenko ◽  
D.V. Semenchuk ◽  
...  
Keyword(s):  
Sound Level ◽  
Operating Efficiency ◽  
National Academy Of Sciences ◽  
Small Arms ◽  
Space Agency ◽  
Level Meter ◽  
Full Scale Tests ◽  
Enclosed Space ◽  
Academy Of Sciences ◽  
Sound Suppression

This paper describes the designs and manufacturing and testing features of small-size silencers developed at the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine for arms used in enclosed space. The topicality of the development is due to the use of stub-barreled arms by Ukrainian special subunits. With consideration for the features of existing silencers for submachine guns of special subunits, a line of compact silencer development was chosen. The paper formulates requirements for the design of silencers for stub-barreled small arms and material and manufacturing accuracy requirements for their components. The use of silent stub-barreled small arms in enclosed space without damaging the shooter’s organs of hearing is justified. In combat operations, sound suppression allows subunits to contact with one another and their commanders to have the situation under control. The paper shows the features of design solutions and describes the design of the silencers’ internal components and their effect on the operating efficiency for different embodiments of theirs. The paper presents the appearances, construction arrangements, and specifications of the small-size silencers developed and the results of their full-scale tests. The sound suppression efficiency of the silencers developed was measured with a sound level meter and verified by comparison tests with basic prototypes developed earlier. The efficiency proved to be (28 – 34) dBA, which is on a level with their best foreign counterparts. The test showed that: - the silencers do not affect firearm automatics and sustain standard firing regimes, - the silencers do not affect the shot grouping characteristics, and - the silencers do not affect other performance characteristics either. Hence the compact silencers developed for stub-barreled submachine guns (assault rifles) are efficient and reliable.

scholarly journals Monoblock silencers for pistols

2020 ◽  
Vol 2020 (3) ◽  
pp. 3-11
Author(s):  
O.V. Pylypenkо ◽  
◽  
N.A. Konovalov ◽  
V.I. Kovalenko ◽  
D.V. Semenchuk ◽  
...  
Keyword(s):  
Sound Level ◽  
The Body ◽  
Operating Efficiency ◽  
National Academy Of Sciences ◽  
Space Agency ◽  
Firing Range ◽  
Shooting Gallery ◽  
Level Meter ◽  
Full Scale Tests ◽  
Production Company

This paper presents the stages of development of silencers with monoblock spreaders for pistols. The features of two groups of monoblock silencer designs (with and without a central tube) are identified and described. The use of different materials for different silencer parts is substantiated: the body and the monoblock are made of an aluminium alloy, the covers and the unions are made of a titanium alloy, and the perforated tubes are made of steel or titanium. The paper shows the features of design solutions and describes the design of internal components and their effect on the operating efficiency for different embodiments of theirs. The mamufacture of silencers of this design is less labor intensive in comparison with silences with discrete components (bodies, bushings, etc.), thus offering a lower cost due to the use of advanced technologies in the manufacturing of the silencer components and the silencer as a whole. The paper presents the results of firing range and shooting gallery full-scale tests of monoblock silencers with Glock 17 and Fort 14 pistols using 9х18 mm і 9х19 mm cartridges. The results show that: - in sound suppression efficiency, the silencers compare well with their best foreign counterparts and outperform the standard silencers of Research and Production Company Fort at comparable dimensions and mass. The efficiency of the silencers developed was measured with a precision pulsed sound level meter and verified by comparison tests with basic prototypes developed earlier and foreign silencers. The efficiency proved to be (25 – 36) dB(A). - the silencers do not affect pistol automatics and sustain standard firing regimes, - the silencers do not affect the shot grouping characteristics, and - the silencers do not affect other performance characteristics either. Hence the silencers for Fort or similar pistols developed at the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine are efficient and reliable.

Compact silencers for new-generation light small arms

2021 ◽  
Vol 2021 (2) ◽  
pp. 20-35
Author(s):  
O.V. Pylypenko ◽  
◽  
N.A. Konovalov ◽  
V.I. Kovalenko ◽  
◽  
...  
Keyword(s):  
Gas Flow ◽  
High Efficiency ◽  
Design Feature ◽  
Operational Reliability ◽  
National Academy Of Sciences ◽  
Expansion Chamber ◽  
Small Arms ◽  
Technical Requirements ◽  
Space Agency ◽  
Perforated Tube

This paper presents the results of the development of silencers, whose design feature is a central perforated tube, at the institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine (ITM of NASU and SSAU). The advisability of silencers of this type is confirmed by their operational reliability and shot sound suppression efficiency in their actual service as part of light small arms of different types. To design high-efficiency advanced silencers, technical requirements for their design were developed. The paper describes the possibility of using a central perforated tube as the key component of a powder gas spreader. Differently shaped elements or a combination thereof are used as additional elements that form a powder gas flow inside a silencer: conical and spherical axisymmetric baffles coaxial with the silencer body, cylindrical shells (including perforated ones) that provide a powder gas flow between the expansion chambers along the internal axis of the central channel, helicoidal elements, and peripheral labyrinth-vortex contours. One way to increase silencer efficiency is an additional expansion chamber that embraces the external part of the barrel and is gas-dynamically connected to a traditional muzzle silencer. In deciding on an advisable design for compact silencers, the following was redetermined: the number of expansion chambers, the powder gas energy converter design, the baffle type, the presence of a gas flow between the chambers along the inner surface of the silencer body, and, if so, the gas flow rate. The silencer design was optimized based on simulating the silencer gas dynamics using the authors’ efficiency calculation procedure for silencers with a central perforated tube and different internal components. The paper describes the procedure and presents the results calculated with its help. Comparison tests of the silencers developed and foreign silencers confirmed a high efficiency of the former. The silencers with a central perforated tube for light small arms developed at the ITM of NASU and SSAU compare well in performance with their best foreign counterparts. The designs of some of them are covered by Ukrainian patents.

scholarly journals Strength, reliability, and life of aerospace and power engineering structures

2021 ◽  
Vol 2021 (2) ◽  
pp. 100-106
Author(s):  
V.S. Hudramovich ◽  
Keyword(s):  
Large Body ◽  
Power Engineering ◽  
Shell Structures ◽  
Computational Time ◽  
Launch Vehicles ◽  
National Academy Of Sciences ◽  
Engineering Structures ◽  
Space Agency ◽  
Academy Of Sciences ◽  
Conference Papers

This paper gives a brief overview of investigations into the strength, reliability, and life of aerospace and power engineering structures conducted along the following reseach line of the Institute of Technical mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine: the strength, reliabiliyty, and optimization of mechanical systems, launch vehicle, and spacecraft. The basic literature sources of 1991–2021 are cited. A more detailed consideration is given to the results obtained in 2014–2021 and published (monographs, articles indexed in international citation databases, and international conference papers). They involve the simulation of deformation of inhomogeneous material, in particular concrete, in heat-and-power engineering structures, the life estimation of shell structures of rocket/space hardware in the presence of stress concentrators in the form of openings, inclusions, and cracks, and the development of a methodological basis for the strength, reliability, and life of launch complexes for launch vehicles of different spacecraft classes. The methodological stages of calculation are considered, and high-intensity thermomechanical loads are classified. The life of launch complexes is determined using the notion of low- and high-cycle fatigue. Consideration is given to the development of fast projection-iteration schemes of the finite-element method and the method of local variations, which significantly reduce the computational time and may be used to advantage when a large body of calculations is needed in the design and development of new aerospace hardware and power engineering structures with the use of experiments at the developmental stage. In doing so, the effect of inelastic deformations in the vicinity of cutouts is analyzed. A numerical simulation of the strength and stability of inhomogeneous shell structures with the use of the above-mentioned new computational schemes is considered. Investigations of this type first of all involve inhomogeneous thin-walled shell structures at local loads and the effect of reinforcing inclusions on stress and strain concentration.

Materials for the history of the gospel-Baptist movement in Ukraine

1996 ◽  
pp. 4-15
Author(s):  
S. Golovaschenko ◽  
Petro Kosuha
Keyword(s):  
Large Scale ◽  
Religious Studies ◽  
Theological Seminary ◽  
National Academy Of Sciences ◽  
Evangelical Christians ◽  
Evangelical Christian ◽  
First Results ◽  
History Of ◽  
Fruitful Cooperation ◽  
Academy Of Sciences

The report is based on the first results of the study "The History of the Evangelical Christians-Baptists in Ukraine", carried out in 1994-1996 by the joint efforts of the Department of Religious Studies at the Institute of Philosophy of the National Academy of Sciences of Ukraine and the Odessa Theological Seminary of Evangelical Christian Baptists. A large-scale description and research of archival sources on the history of evangelical movements in our country gave the first experience of fruitful cooperation between secular and church researchers.

The phenomenon of religion

1996 ◽  
pp. 45-46
Author(s):  
Borys Lobovyk
Keyword(s):  
Religious Studies ◽  
National Academy Of Sciences ◽  
Historical Phenomenon ◽  
Academy Of Sciences

"PHENOMENON OF RELIGION" - under this name on June 20-21, 1996, the All-Ukrainian Colloquium, convened by the Department of Religious Studies and the Ukrainian Association of Religious Studies took place at the Institute of Philosophy of the National Academy of Sciences of Ukraine. The purpose of the colloquium is to discuss the topical issues of Ukrainian religious studies concerning the nature, essence and functionality of religion as a social and historical phenomenon.

First Ricin Readings

1998 ◽  
pp. 39-41
Author(s):  
Oleksandr N. Sagan
Keyword(s):  
Religious Studies ◽  
National Academy Of Sciences ◽  
Medical College ◽  
Religious Consciousness ◽  
Medical Academy ◽  
65Th Anniversary ◽  
Academy Of Sciences

On April 22, 1998, on the occasion of the 65th anniversary of the publication of Arsen Rychinsky's "Problems of Ukrainian Religious Consciousness" in Kremenets (Ternopil region), the First Rychinsky reading was held. The organizers of the conference were: Ukrainian Association of Religious Studies, Ternopil Medical Academy named after them. I.Gorbachevsky, Department of Religious Studies at the Institute of Philosophy named after G.S. Skovoroda, National Academy of Sciences of Ukraine, Kremenets Medical College.

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