Aerodynamics of the 120-mm M831A1 projectile - Analysis of free-flight experimental data

Soencksen, Keith P.; Newill, James F.; Plostins, Peter

doi:10.2514/6.2000-4198

Cited by 4 publications

(4 citation statements)

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“…However, when little or no roll is present, the trim angle will be directed in approximately the same orientation throughout the flight, causing a trajectory bias in this direction. The yaw data from these shots indicate that significant trim angles did sometimes exist (Soencksen, et al, 2000). Because the spin rates are so low and so far from steady state, an accurate value for roll damping moment coefficient (C,) was not determinable from these shots.…”

Section: Experimental Results and Analysismentioning

confidence: 93%

“…Since trims are present on some M831A1 shots (Soencksen, et al, 2000), this serves as a possible explanation of the occasional inaccuracies observed in the field. Soencksen et al (2000) also determined that pitch damping of the M831A1 is marginal. This was evidenced not only by the coefficient values, but also by the damping characteristics observed in the experiment.…”

Section: Discussionmentioning

confidence: 97%

“…The analysis showed that an aerodynamic trim existed on most shots (Soencksen, et al, 2000). This, combined with previously published roll data, led to a relatively in-depth roll analysis of the current data set.…”

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confidence: 85%

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Roll characteristics of the 120-mm M831A1 projectile

Soencksen

Newill

Plostins

2001

39th Aerospace Sciences Meeting and Exhibit

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Section: Experimental Results and Analysismentioning

confidence: 93%

Section: Discussionmentioning

confidence: 97%

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Roll characteristics of the 120-mm M831A1 projectile

Soencksen

Newill

Plostins

2001

39th Aerospace Sciences Meeting and Exhibit

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“…The dispersion of the projectiles is measured in mil (milliradian per range) of the projectile. It has been observed that (Zielinski et al 1997;Erline & Hathaway 1999;Soencksen, Newill & Plostins 2000;Weinacht, Newill & Conroy 2005) target impact points (TIP) were randomly distributed in large mils even when the same launch conditions are maintained. The theoretical estimation of the aerodynamic jump of projectiles in free flight which has a significant influence on the dispersion mostly relies upon the linear theory of the projectile, which offers physical insight into the projectile flight dynamics as closed-form solutions (Murphy 1963).…”

Section: Introductionmentioning

confidence: 99%

Flow interactions on supersonic projectiles in transitional ballistic regimes

et al. 2020

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Analytical Approach to Ballistic Dispersion of Projectile Weapons Based on Variant Launch Velocity

Chen

2011

Journal of Applied Mechanics

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This study quantifies the contribution of variant projectile velocity at a gun muzzle to its dispersion at an aim point from an analytical approach. The dispersion was formulated on the basis of stochastic physical conditions including potential crosswind effect. As a result, the statistical quantities of projectile impact distribution could be obtained from the stochastic formulation. In addition, this research proposes correction factors that may be needed when comparing dispersion in angular mil at multiple downrange distances. The significance of the correction factors was demonstrated through a few applicationBallistic dispersion is one of the important metrics that has been used to assess the performance of a weapon system. Over the past two decades, much research has been conducted to characterize target impact dispersion. In general, a wide range of ammunitions, including large-, medium-, and small-caliber projectiles, along with a few different weapon systems, including air guns and electromagnetic guns, has been covered for dispersion study [1][2][3][4]. Most investigations focused on dispersion analysis of experimental data for a particular weapon system. Some published research discussed ballistic dispersion with the consideration of a predefined physical condition from external environment, and others addressed the phenomenon with the demonstration of computer modeling and simulations [5,6].Conventionally, the absolute value of dispersion was initially computed based on a number of rounds at a certain range. Then, the dispersion quantity was divided by tbe corresponding downrange distance to obtain the dispersion in angular mil. This dimensionless unit enables us to compare dispersions at two or more different downrange distances. This comparison of dispersion at multiple distances is valid under the assumption that the projectile flies in a vacuum space. In other words, no external factor is considered in the calculation. Thus, one of the objectives of this study is to formulate the random nature of round-to-round errors in consideration of several varying environmental factors and evaluate if the underlying assumption for the conventional dispersion calculation is appropriate when some external forces are taken into account during flight. This analytical approach links dispersion results to projectile initial velocity conditions or vice versa from a theoretical point of view. When one of these two measurements is available, the other quantity could be derived accordingly. The proposed formulas in this study may be utilized to facilitate performance assessments of weapon systems.This investigation begins with the introduction of the most simplistic case, one where no external force is applied on a projectile during flight. That is, the initial conditions of the projectile at the muzzle remain the same throughout the entire flight period. It has been observed from many experiments that the target impact points (TIPs) were randomly distributed even when the same ammunition and weapon types were fired....

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Aerodynamics of the 120-mm M831A1 projectile - Analysis of free-flight experimental data

Cited by 4 publications

References 1 publication

Roll characteristics of the 120-mm M831A1 projectile

Roll characteristics of the 120-mm M831A1 projectile

Flow interactions on supersonic projectiles in transitional ballistic regimes

Analytical Approach to Ballistic Dispersion of Projectile Weapons Based on Variant Launch Velocity

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