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Pseudostabilny lot naddźwiękowego pocisku moździerzowego

Merda Tomasz

Problemy Techniki Uzbrojenia

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2019

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R. 48, z. 149

23--46

PL

W trakcie prac nad opracowywaniem naddźwiękowych pocisków moździerzowych, podczas strzelań jednym z typów pocisku, zaobserwowano bardzo duży rozrzut. Wykorzystując model balistyki zewnętrznej traktujący pocisk jako bryłę sztywną wyznaczono tory lotu badanych pocisków oraz określono ich parametry i przyczyny rozrzutu ich punktów upadku. Analiza uzyskanych wyników wykazała, że przyczyną powstałego rozrzutu nie był podrzut aerodynamiczny tylko inne, nie opisane dotąd w literaturze, zjawisko, które w niniejszej pracy zostało nazwane „pseudostabilnym lotem pocisku”. W pracy przedstawiono opis, określono przyczyny i czynniki mające wpływ na jego występowanie oraz przedstawiono metodę wyznaczania kąta nutacji równowagi, który jest kluczowy dla tego zjawiska.

EN

Significantly large dispersion of projectiles was observed at firing a specific type of a supersonic mortar projectile being developed. The flying paths, parameters and reasons of falling points dispersion were determined for tested projectiles with a model of external ballistics describing the projectile as a rigid body. Analysis of received results has indicated that the dispersion was not caused by an aerodynamic jump but by an effect which has not been described yet in the literature and is named here as “projectile’s semi stable flight”. The paper includes a description of the effect with reasons and parameters affecting its occurrence, and a method for determination of the equilibrium nutation angle which plays a key role in this effect.

2

Mortar Projectile Reverse Shooting Test

Merda T.

Machine Dynamics Research

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2018

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Vol. 42, No. 4

59--72

EN

In the article a reverse shooting test was described. The main idea of the test was to shoot the mortar projectiles inserted in the barrel in the opposite way, i.e. with the fins at the front. The test was designed to analyze the supersonic mortar projectiles aerodynamic coefficients at the significant total angles of attack. At the beginning the test setup was shown. During the test three projectiles were fired at the different charges. In the article all available data gathered during the test was shown. Also, the high disturbed flight at the beginning was described. The author concluded the gathered data and added the suggestions of the test improvements.

3

Calculations of Pitch at Flight for Mortar Projectiles

Magier M., Merda T.

Machine Dynamics Research

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2018

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Vol. 42, No. 4

5--16

EN

In this article, two different point mass model methods for pitch angle calculations for fin stabilized projectiles were shown and analyzed. The first method originates from the Modified Point Mass Model and was presented by McCoy. Comparison of the calculated pitch angles with the 5-degrees-of-freedom external ballistic model results has shown insufficient accuracy of the CRAWFISH-AMMUNITION shooting parameters range. Therefore, the authors presented their own method for pitch angle calculations. Comparison of methods at the wide range of entry parameters was made and has shown higher accuracy of the method developed by the authors of this article.