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Projectile

About: Projectile is a research topic. Over the lifetime, 13047 publications have been published within this topic receiving 115563 citations.


Papers
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Proceedings ArticleDOI
06 Aug 2001
TL;DR: In this article, the authors describe and evaluate a guidance algorithm that is well suited for force control in a direct fire spinning projectile with micro synthetic jets, which achieve force or moment control by interacting with the flow.
Abstract: There exists a significant potential for improving the accuracy of direct fire spinning projectiles through the implementation of aerodynamic control. Of particular interest is the use of micro synthetic jets, which achieve force or moment control by interacting with the flow. Guidance and control methods need to be specially tailored for this application so that they require minimum control effort, and take maximum advantage of the dynamic characteristic of the projectile. We describe and evaluate a guidance algorithm that is well suited for force control. Results show a dramatic improvement in the impact point miss distance over an uncontrolled projectile, with very modest control effort. We also consider the effect that moments induced by actuation process can have on performance. Notation

34 citations

Patent
25 Sep 1980
TL;DR: In this paper, the authors propose to use a base bleed unit to brake the rotation of the fin-stabilized trajectory of a single-fur projectile, which can be extended at a desired point in the trajectory of the projectile.
Abstract: With the object of facilitating the terminal guidance of the projectile or increasing the effect of an explosive charge with a hollow-charge effect carried by the projectile, the projectile is provided with stabilizing fins (6-9) which are extended at a desired point in the trajectory of the projectile and brake the rotation of the projectile. The projectile is so dimensioned that its centre of pressure (C2) is situated behind the centre of gravity (G) of the projectile in the extended position of the fins (Figure 2) and so that the centre of pressure (C1) lies in front of the centre of gravity of the projectile in the retracted position of the fins (Figure 1), so that, with braked rotation, the projectile changes over from being spin-stabilized to being fin-stabilized. The fins (6-9), which can consist of so-called wraparound fins, are held in the retracted position, in an embodiment shown, by means of covering plates (2-5) which are held in place by a so-called base bleed unit (1). A delay device is adapted to be separated from the projectile at said desired point in the trajectory, so that the covering plates (2-5) are removed and expose the fins (6-9), as a result of which these can be extended.

34 citations

Journal ArticleDOI
TL;DR: In this article, the authors used the AUSMDV scheme and the dynamic chimera grid technique to describe the motion of a moving projectile in the launch process of a projectile at a relative high Mach number of 30.
Abstract: Numerical investigations on the launch process of a projectile in a nearly realistic situation have been performed in this article The Arbitrary Lagrangian–Eulerian (ALE) of Euler equations is solved by the AUSMDV scheme and the dynamic chimera grid technique are used for describing the moving of the projectile Based on our numerical results, the muzzle blast flow field of the transient launch process of a projectile at a relative high Mach number of 30 has been visualized numerically, and the prominent characteristics including the propagation of first and second blast waves, the generation of bow shock wave and moving of the projectile, etc have been discussed in detail

34 citations

Patent
Paul A. Merems1
11 Aug 2008
TL;DR: In this article, a deployable net is deployed on an interceptor during flight and it is deployed around an incoming projectile, such as a rocket-propelled grenade (RPG).
Abstract: An interceptor projectile includes a deployable net that deploys during flight and wraps around an incoming projectile, such as a rocket propelled grenade (RPG). The net is initially in a tubular body of the interceptor projectile. Weights are attached to ends of the net with metal cables. A propellant is used to deploy the net from the tubular body and to deploy the weights at acute angles to the longitudinal axis of the interceptor projectile. The weights move radially out from the interceptor projectile, expanding the net outward, and wrapping the net around an incoming projectile. The engagement of the net with the incoming projectile disables the incoming projectile, sending the incoming projectile off course.

34 citations

Journal ArticleDOI
TL;DR: In this article, time-accurate numerical simulations are used to study the dynamic development of oblique detonations on accelerating projectiles in ram accelerators, and it is shown that a small change in the shape of the projectile shape can significantly alter the overall detonation structure and significantly affect the pressure distribution on the projectile.
Abstract: Time-accurate numerical simulations are used to study the dynamic development of oblique detonations on accelerating projectiles in ram accelerators These simulations show that the oblique detonation can be stabilized on the projectile The high pressure generated behind the detonation can result in accelerations up to 106G and propel the projectile to velocities higher than 40 km/s The detonation structure on the projectile is sensitive to the projectile geometry A small change in the projectile shape is sufficient to alter the overall detonation structure and significantly affect the pressure distribution on the projectile In order to maximize the thrust, an appropriate projectile shape has to be chosen to generate the detonation structure just behind the widest part of the projectile body The projectile acceleration also has strong effects on the flow field and the detonation structure During the acceleration, the location of the oblique detonation moves upstream from one reflected shock to another However, one the detonation is stabilized behind the upstream shock, it remains at the new location until the transition to the next upstream shock occurs In the simulations, the Non-Inertial-Source (NIS) technique was used to accurately represent of the projectile acceleration Also, the Virtual-Cell-Embedding (VCE) method was employed to efficiently treat the complex projectile geometry on cartesian grids

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
2023650
20221,196
2021290
2020458
2019452