Autor: Nguyen, Dung Thai - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Studying the thermo-gas-dynamic process in a muzzle brake compensator
Autorzy:: Nguyen, Dung Van
Bui, Viet Quy
Nguyen, Dung Thai
Uong, Quyen Si
Truong, Hieu Tu
Powiązania:: https://bibliotekanauki.pl/articles/27309887.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: thermo-gas-dynamic
muzzle device
muzzle brake compensator
automatic gun
dynamiczny termo-gaz
urządzenie wylotowe
kompensator hamulca wylotowego
pistolet automatyczny
Opis:: To reduce the recoil and improve the stability of small arms, a muzzle brake compensator is attached to the muzzle of the barrel. This device uses the kinetic energy of the powder gas escaping from the bore after the bullet is fired. In this paper, the authors present the determination of the thermo-gas-dynamic model of the operation of a muzzle brake compensator and an example of calculating this type of muzzle device for the AK assault rifle using 7.62x39 mm ammunition. The results of the calculation allowed for obtaining the parameters of the powder gas flow in the process of flowing out of the muzzle device, as well as the change in the momentum of the powder gas's impact on the muzzle device. The model proposed in the article provides the basis for a quantitative evaluation of the effectiveness of using the muzzle device in stabilizing infantry weapons when firing.
Źródło:: Archive of Mechanical Engineering; 2023, LXX, 2; 311--328
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Research, Calculation and Proposal of Ventilation Solution for Duong Huy Coal Mine when Mining Down to -250 m Depth
Autorzy:: Dao, Van Chi
Le, Tien Dung
Vu, Thai Tien Dung
Nguyen, Hong Cuong
Powiązania:: https://bibliotekanauki.pl/articles/2020250.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: main fan
working mode
ventilation
airflow
air pressure
air velocity
wentylacja
ciśnienie
powietrze
Opis:: At present, according to the extraction plan in the year 2020 of Duong Huy Coal Company - Vinacomin, the mining is divided into three main zones: Central Zone extracts 06 faces; South Zone extracts 2 faces and Northeast Zone extracts 2 faces. The designated total production of all zones is 1,880,000 tons/year. To ensure the production of each mining zone, exhaust fan stations are installed at ventilation roadway adits with a total of 05 main fan stations. However, in the near future, to ensure and maintain production activities, the mine is being planned and operated using 03 main fan stations. The calculation results for the reasonable working mode of fan stations are as follows: for fan station FBCDZ8-№32B at level +47 m, airflow is 167.69 m3 /s and air pressure is 243.74 mm H2O; for fan station 2K56- №30 level +40 m, airflow is 123.37 m3 /s and air pressure is 324.79 mm H2O; for fan station FBCDZ-8- №32B at level +44 m, airflow is 167.69 m3 /s and air pressure is 354.99 mm H2O.
Źródło:: Inżynieria Mineralna; 2021, 2; 513--520
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Fracture Mechanism of Hard Main Roof and Determining the Width of Coal Pillars when Extracting Flat-lying Coal Seams
Autorzy:: Le, Quang Phuc
Dao, Van Chi
Nguyen, Phi Hung
Vu, Thai Tien Dung
Powiązania:: https://bibliotekanauki.pl/articles/27323252.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: failure mechanism
coal pillar
stress distribution
roadway deformation
retained roadway
hard main roof
gob-side entry
węgiel
filary
stabilność
Wietnam
Opis:: In underground coal mining, the stability of roadways and gob-side entry depends on the coal pillar width. An unreasonable width of the coal pillar will cause the roadway to be in a dangerous zone of influence of the abutment pressure, leading to severe roadway deformation. This paper studies the fracture mechanism of the hard main roof and reasonable coal pillar width to protect the stability of gob-side entry driving. The research results show that when mining a coal seam under a hard main roof, the console of the main roof on the edge of the coal seam has the form of hinge structure. The great load of the roof layers and the rotation of the console are the main causes leading to the variation of the stress field in the coal seam. According to the development law of the stress field, after the main roof completes the collapse process, the peak of the maximum stress will move deep into the solid coal seam, and on the edge of the coal seam it will form a low-stress zone. Research results from the case of Seam #11 of Khe Cham coal mine, Vietnam show that the gob-side entry will be well stabilized when the narrow coal pillar between it and the boundary of the gob is 4–5 m.
Źródło:: Inżynieria Mineralna; 2023, 2; 271--280
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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