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Research Papers

Advanced Gun System Gun and Projectile Dynamic Model Results and Correlation to Test Data

[+] Author and Article Information
J. Edward Alexander

 BAE Systems, 4800 East River Road, Minneapolis, MN 55421-1498ed.alexander@baesystems.com

J. Pressure Vessel Technol 134(4), 041005 (Jul 09, 2012) (10 pages) doi:10.1115/1.4006352 History: Received November 14, 2011; Revised February 18, 2012; Published July 09, 2012; Online July 09, 2012

BAE Systems is currently developing and testing a 155 mm advanced gun system (AGS) and a long range land attack projectile (LRLAP) as a part of the DDG-1000 ship development program. For this development, it is important to understand the barrel and projectile dynamics, including the interaction of the barrel and the projectile in the bore as well as the projectile tip-off parameters at exit. An abaqus explicit dynamic finite element model has been developed to compare results with test data that were taken on June 18, 2003, at the BAE Systems site at the Alliant Techsystems Proving Ground (ATPG) during AGS propellant testing. The abaqus model includes the gun barrel, the projectile used for propellant testing (a steel slug), the M110 gun mount, and the recoil system. Features of the model incorporate settling of the barrel due to gravity, gun recoil, in-bore interaction of the projectile and the barrel using contact surfaces, and the initial flight of the projectile after bore exit. The abaqus model results have been compared with gun firing test data acquired during propellant testing at Elk River, MN. These comparisons include barrel and projectile displacements, angular velocities, and axial accelerations. The abaqus model results are also compared to similar models of the test conditions with the simulation of barrel dynamics (simbad ) gun dynamics code and the ibhvg 2 interior ballistics code.

Copyright © 2012 by American Society of Mechanical Engineers
Topics: Projectiles , Firing
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References

Figures

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Figure 1

Breech end of AGS barrel in M174 (8-in.) gun mount in AGS test facility

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Figure 2

abaqus model of AGS test barrel

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Figure 3

AGS barrel in M110 mount

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Figure 4

AGS barrel model breech end

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Figure 5

AGS barrel model muzzle end

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Figure 6

Projectile used for propellant testing

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Figure 7

abaqus projectile model

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Figure 8

Projectile connector elements for rifling torque application

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Figure 9

AGS barrel in M110 gun mount

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Figure 10

abaqus model of the AGS gun in M110 mount

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Figure 11

Spring elements representing M110 mount

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Figure 12

Barrel vertical support lug spring

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Figure 13

Nonlinear spring curves for recoil and recuperator cylinders

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Figure 14

Breech, mean, and base pressures from ibhvg 2 model corresponding to RMP-20 test

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Figure 15

Rifling torque on projectile and spin rate relationship

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Figure 16

Muzzle vertical displacements during gun firing

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Figure 17

Laser 1 barrel displacement measurements during gun firing

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Figure 18

abaqus barrel displacements corresponding to laser 1 location

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Figure 19

Laser 1 measured and abaqus calculated barrel displacements

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Figure 20

Laser 5 measured and abaqus calculated barrel displacements

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Figure 21

Laser 2 measured and abaqus calculated barrel displacements

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Figure 22

Laser 6 measured and abaqus calculated barrel displacements

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Figure 23

Barrel muzzle axial accelerations from test data and model results

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Figure 24

Shock response spectrum plots of barrel muzzle test and model axial accelerations

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Figure 25

Muzzle angular velocity from test data and model results

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Figure 26

Projectile muzzle velocity

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Figure 27

Projectile pitch angle at muzzle exit

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Figure 28

Projectile pitch velocity at muzzle exit

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Figure 29

Projectile yaw angle at muzzle exit

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Figure 30

Projectile yaw velocity at muzzle exit

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Figure 31

abaqus projectile in-bore acceleration

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