Detached Eddy Simulations and Reynolds-Averaged Navier- Stokes Calculations of a Spinning Projectile

Doraiswamy, S.; Candler, Graham V.

doi:10.2514/1.31935

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…upstream and around projectile up to 25D (4L) in all directions except in the downstream; it was extended up to 50D (8L). According to [16] grid sensitivity study was carried out at the highest Mach number 2.68. Five structured 2-D grids have been generated using Gambit 2.4 to obtain the grid independent solution.…”

Section: 56dmentioning

confidence: 99%

Ballistic Analysis of a Projectile Provided with Base Bleed Unit

Abou-Elela¹,

Ibrahim²,

Mahmoud³

et al. 2013

International Conference on Aerospace Sciences and Aviation Tec

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An analysis has been performed to investigate the ballistic performance of the 155mm K307 extended range projectile provided with base bleed unit. Different tools were used to perform this analysis; including analytical modeling and available computational resources. Drag reduction modeling has been used to study the effect of different parameters on base bleed performance such as burning rate, number of base bleed grain parts and the grain dimensions. The study has showed that a better ballistic performance could be obtained when the exit mass flow rate of the burnt gases is relatively large at the first few seconds of the projectile flight. To change this mass flow rate along the trajectory, a newly developed technique has been introduced. The technique depends on filling the base bleed unit with a grain subjected to burning by two rates resulting in extending the projectile range.

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Section: 56dmentioning

confidence: 99%

Ballistic Analysis of a Projectile Provided with Base Bleed Unit

Abou-Elela¹,

Ibrahim²,

Mahmoud³

et al. 2013

International Conference on Aerospace Sciences and Aviation Tec

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“…Impulsive-correction projectile, as a type of precision-guided munitions, produces directive force for trajectory control, which results in quick-maneuvering and precise-correcting via small impulsive rockets equipped around the cross section of the airframe. This has also attracted significant interests of research due to its short-time response, high ratio of effectiveness-consumption, and simpleness of guidance [1][2][3][4][5]. Considerable work on the design of magnitude of impulse thrust and its position arrangement [4], real-time computational algorithm [6], flight stability of impulsive-correction trajectory [7], and so on has been developed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Optimal Control Method for Impulsive-Correction Projectile Based on Particle Swarm Optimization

Sun

Hong

Gang

2016

Discrete Dynamics in Nature and Society

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This paper presents a new parametric optimization approach based on a modified particle swarm optimization (PSO) to design a class of impulsive-correction projectiles with discrete, flexible-time interval, and finite-energy control. In terms of optimal control theory, the task is described as the formulation of minimum working number of impulses and minimum control error, which involves reference model linearization, boundary conditions, and discontinuous objective function. These result in difficulties in finding the global optimum solution by directly utilizing any other optimization approaches, for example, Hp-adaptive pseudospectral method. Consequently, PSO mechanism is employed for optimal setting of impulsive control by considering the time intervals between two neighboring lateral impulses as design variables, which makes the briefness of the optimization process. A modification on basic PSO algorithm is developed to improve the convergence speed of this optimization through linearly decreasing the inertial weight. In addition, a suboptimal control and guidance law based on PSO technique are put forward for the real-time consideration of the online design in practice. Finally, a simulation case coupled with a nonlinear flight dynamic model is applied to validate the modified PSO control algorithm. The results of comparative study illustrate that the proposed optimal control algorithm has a good performance in obtaining the optimal control efficiently and accurately and provides a reference approach to handling such impulsive-correction problem.

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