Influence of crosswind on the projectile movement dynamics

Authors

DOI:

https://doi.org/10.33577/2312-4458.23.2020.17-21

Keywords:

projectile exterior ballistics, the Mach number, crosswind, D-20 howitzer, shooting range

Abstract

The paper analyzes the application area of the formula for determining the lateral projectile displacement under the action of crosswind, which is used nowadays in the compilation of range-tables. It is established that this formula is true: if the drag force to the projectile movement is proportional to the square of its velocity; wind velocity components are much less than the horizontal component of projectile velocity; the projectile velocity projections on the Oy and Oz axes are much less than the projections on the Ox axis; the dimensionless factor of resistance and the crosswind value are constant values. However, the power of resistance of the projectile movement only sometimes is proportional to its squared velocity; the projectile velocity component about the axis Oz is not always much less than its component about the axis Ox, and may even be larger than it; the factor of resistance is not a constant value, but depends on the value of the Mach number, so it can be constant only at short-range firing. The authors propose mathematical model for determining the lateral projectile displacement under the action of crosswind. It is considered that the efficiency of the crosswind on the projectile depends on: air density; projectile maximum area of longitudinal section raised to centain power; the difference between the value of the cross component of wind and the velocity of the projectile lateral displacement to some extent. The values of the projectile lateral displacement under the crosswind action at short-range firing differ slightly from the values of the lateral displacement specified in the range-tables. The values are obtained by applying the proposed mathematical model. However, with extending the shooting range, the difference between these values is constantly increasing and reaches the values of the same order with the values of the lateral displacement determined by the theoretical method or specified in the range-table. Analyzing the velocity of the projectile lateral displacement under the crosswind action, it was obtained that its theoretical value constantly grows along with the increase duration of the projectile flight endurance. However, the velocity of the projectile lateral displacement obtained using table values initially increases, but with increase of shooting range it begins to decrease, which does not comply with the laws of dynamics. Therefore, the table values of the projectile lateral displacement under the crosswind action do not quite accurately indicate its value.

References

Таблиці стрільби для рівнинних і гірських умов 152 мм гармати-гаубиці Д-20. – Львів, 2017. – 472 с.

Внешняя баллистика. Часть ІI / А.Д. Чернозубов, В.Д. Кириченко, И.И. Разин, К.В. Михайлов. – М., Типография Артиллерийской инженерной академии, 1954. – 501 с.

Robert L. McCoy. Modern Exterior Ballistics. The Launch and Flight Dynamics of Symmetric Projectiles. 2012/ - 328 pages

LEWTAS Ian, MCALISTER Rachael, WALLIS Adam, WOODLEY Clive, CULLIS Ian. The ballistic performance of the bombard Mons Meg. Defence Technology 12(2016) 59-68.https://doi.org/10.1016/j.dt.2015.12.001

Cech, V, Jedlicka, L. and Jevicky, J. (2014) Problem of the reference height of the projectile trajectory as a reduced meteo-ballistic weighting factor, Defence Technology, №10, pp. 131-140. http://dx.doi.org/10.1016/j.dt.2014.06.002

Sahoo S., Laha M.K. Coefficient of Drag and Trajectory Simulation of 130 mm Supersonic Artillery Shell with Recovery Plug or Fuze. Defence Science Journal, Vol. 64, No. 6, November 2014, pp. 502-508, DOI: 10.14429/dsj.64.8110

Bo Zhang, Shushan Wang, MengyuCao,YuxinXu. Impacts of Deflection Nose on Ballistic Trajectory Control Law.Hindawi Publishing Corporation, Mathematical Problems in Engineering, Volume 2014, Article ID 984840, 6 pages, http://dx.doi.org/10.1155/2014/984840

Problem of the reference height of the projectile trajectory as a reduced meteo-ballistic weighting factor / V. Cech, L. Jedlicka, J. Jevicky // Defence Technology. – 2014. – №10. – P. 131-140. http://dx.doi.org/10.1016/j.dt.2014.06.002

Ткачук П.П., Величко Л.Д., Горчинський І.В. Вплив вітру на зовнішню балістику кулі, випущеної із СВД. Військово-технічний збірник. – Випуск №19. – Львів: НАСВ, 2018. – С. 43–49. DOI: https://doi.org/10.33577/2312-4458.19.2018.43-49

Ткачук П.П., Горчинський І.В., Величко Л.Д. Зов-нішня балістика осколково-фугасного снаряда ОФ-462Ж. Військово-технічний збірник. – Випуск № 22. – Львів: НАСВ, 2020. – С. 14–20. DOI: https://doi.org/10.33577/2312-4458.22.2020.14-20

Published

2020-11-20

How to Cite

Velychko, L., Petruchenko, O., & Tereshchuk, O. (2020). Influence of crosswind on the projectile movement dynamics. Military Technical Collection, (23), 17–21. https://doi.org/10.33577/2312-4458.23.2020.17-21

Issue

Section

COMBAT EMPLOYMENT OF MILITARY EQUIPMENT