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Wyświetlanie 1-2 z 2
Tytuł:
Role of wave reverberations in exit vibrations of projectiles and shells
Autorzy:
Trębiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/279876.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
intermediate ballistics
projectile vibrations
wave reverberation
Opis:
Carlucci et al. (2013) proposed a theoretical model describing exit vibrations of a shell launched by a gun. The model treats the shell as a system of a spring, damper and a rigid mass. In this paper, similar models describing vibrations of shells and monolithic projectiles are compared with some 1D models taking into account wave reverberations. The comparison proves that the models taking into account the wave motion, forecast similar amplitudes and frequencies of vibrations as discrete models. However, details of acceleration time courses differ considerably. The problem of the influence of the friction force between the shell wall and the filling is also discussed. The results of modelling serve as well for assessing if some projectile velocity oscillations detected by making use of the Doppler radar can be solely attributed to the exit vibrations.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 667-677
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical study of stress distribution models for estimation of stresses beneath plain rigid wheels and a vertical force on TRI-1 lunar soil simulant
Autorzy:
Kumar, Pala Gireesh
Jayalekshmi, S.
Powiązania:
https://bibliotekanauki.pl/articles/949136.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
TRI-1 lunar soil simulant
stress distributions
entry and exit angels
vertical force
DNSR and DSSR
Opis:
In this paper, three stress distribution models are considered, namely: Reece from 1965, Bekker from 1969, Wong-Reece from 1967. Two types of wheels are considered for the preset study, i.e., a small wheel with diameter of 160 mm and width 32 mm, whereas for a large wheel with diameter of 210 mm and width of 50 mm. TRI-1 or Tiruchirappalli soil simulant is considered for the interaction studies, which is an anorthosite based lunar soil simulant. The normal stress, shear stress and vertical forces are determined when the wheel starts moving on TRI-1 soil simulant. Entry and exit angles are also calculated for all models to estimate vertical forces. The maximum normal stress found for the small wheel was 32.121 kN/m2 (Wong-Reece model). In the case of the large wheel, the maximum normal stress was found to be 39.016 kN/m2 (Reece model). Vertical forces are found from the obtained normal stresses and shear stresses, and are presented graphically. The dimensionless stress ratio of both the wheels for the considered models, i.e., DNSR and DSSR, is also found.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 791-802
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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