Real-time calculation of fragment velocity for cylindrical warheads

Felix, David; Colwill, Ian; Stipidis, Elias

doi:10.1016/j.dt.2019.01.007

Cited by 20 publications

(15 citation statements)

References 10 publications

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“…The variable x is the distance of the fragment from the detonation end plate and L is the length of the warhead. Felix 27 also uses the work of several researchers to determine the position of the maximum fragment velocity (and by implication the maximum angle of projection) at a point 0.6 of the length of the warhead from the detonation (referred to as point M in this paper).…”

Section: Method: Analysis and Derivation Of Anew Equationmentioning

confidence: 99%

“…A reasonable formula for the variation of this velocity is given in Felix's paper. 27 The equations to calculate a fragment's initial velocity of projection, set out in the paper, are as follows:…”

Section: Improving the Initial Velocity Of A Fragmentmentioning

confidence: 99%

“…The value of 0.65 is derived from the work of several researchers and discussed in Felix's paper. 27 It represents the fraction of the Gurney velocity for the velocity of fragments at the end plates (i.e., the Gurney velocity multiplied by 0.65). The variable x is the distance of the fragment from the detonation end plate and L is the length of the warhead.…”

Section: Improving the Initial Velocity Of A Fragmentmentioning

confidence: 99%

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Real-time calculation of the initial angle of projection for fragments in cylindrical warheads

Felix

Colwill

Harris

2021

Journal of Defense Modeling & Simulation

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This paper presents an improvement in the speed and accuracy of calculating the initial angle of projection of fragments for exploding cylindrical shells. It is a fast tool that can be used by designers, where existing approaches, such as computationally intensive Finite Element Analysis, are preventively slow. An enhanced Taylor equation is presented using available experimental data and the effect of the changing shape of the warhead’s cylindrical casing on the fragment’s initial projection angle. The resulting equation is computationally fast as it uses uncomplicated equations and provides improved accuracy for estimating a fragment’s initial angle of projection in comparison to existing work.

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Section: Method: Analysis and Derivation Of Anew Equationmentioning

confidence: 99%

Section: Improving the Initial Velocity Of A Fragmentmentioning

confidence: 99%

Section: Improving the Initial Velocity Of A Fragmentmentioning

confidence: 99%

See 1 more Smart Citation

Real-time calculation of the initial angle of projection for fragments in cylindrical warheads

Felix

Colwill

Harris

2021

Journal of Defense Modeling & Simulation

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“…The equation used in this simulation is taken from Felix's paper. 13 The three-dimensional coordinates of the velocity are given by the following equation:…”

Section: Calculate the Initial Velocity Of Fragmentsmentioning

confidence: 99%

Real-time simulation of a fragmenting explosion for cylindrical warheads

Felix

Colwill

Harris

2021

Journal of Defense Modeling & Simulation

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Explosion models based on finite element analysis (FEA) can be used to simulate how a warhead fragments. However, their execution times are extensive. Active protection systems need to make very fast predictions, before a fast attacking weapon hits the target. Fast execution times are also needed in real-time simulations where the impact of many different computer models is being assessed. Hence, FEA explosion models are not appropriate for these real-time systems. As a trade-off between accuracy and execution time, this paper creates a simulation of fragments from a warhead’s explosion, using simple analytical equations. The results are verified against explosion experimental data and FEA results. The developed model then can be made available for real-time simulation and fast computation.

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“…Cooper states that the Gurney constant can be estimated using the detonation velocity of explosives [3]. Different authors [4][5][6][7][8][9][10][11] investigated the influence of rarefaction waves from two ends in cylindrical warheads, since the length of casing is not infinite, and consequently, fragment velocities are lower than the Gurney velocity prediction. Gao [4] concluded that the fragment velocities in the central part of the warhead are not influenced by rarefaction waves when the L/D ratio (slenderness) was more than 2.…”

Section: Introductionmentioning

confidence: 99%