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Research Papers

Research for a Projectile Positioning Structure for Stacked Projectile Weapons

[+] Author and Article Information
Qiao Luo

College of Energy and Power,  Nanjing University of Science and Technology, Nanjing 210094, China

Xiaobing Zhang1

College of Energy and Power,  Nanjing University of Science and Technology, Nanjing 210094, Chinazhangxb680504@163.com

1

Corresponding author.

J. Appl. Mech 78(5), 051015 (Aug 05, 2011) (7 pages) doi:10.1115/1.4004285 History: Received November 25, 2010; Revised May 23, 2011; Published August 05, 2011; Online August 05, 2011

One of the key technologies of stacked projectile weapons is projectile positioning. However, the present projectile positioning structures have their respective advantages and shortcomings. A new structure based on the self-locking principle is put forward in this paper and verified as feasible by static analysis if the proper material and structural parameters are chosen. In order to check the strength and verify the feasibility of the structure under launch conditions, the multibody contact finite element model of the structure is established, coupled with dynamic load in the interior ballistic cycle. According to simulations and analysis, the projectile positioning structure is feasible and the strength of the projectile can meet the strength requirement for launch conditions. For different maximum static friction coefficients, simulations show that an increase in the maximum static friction coefficient between the contact surfaces of the positioning ring and barrel improves the positioning performance, but an increase in the maximum static friction coefficient between the contact surfaces of the positioning ring and projectile worsens. On the basis of great computation, it is found that an increase in the upper thickness and height of the positioning ring improves the positioning performance, but an increase in the lower thickness worsens the positioning performance. Further, a lower thickness affects the positioning performance more greatly. As a result, the positioning ring will be thin and light to improve the positioning performance. Compared with other positioning structures, the new structure has little influence on the ballistic performance and is a good application prospect.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A schematic view of the projectile positioning structure with extension column

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Figure 2

A schematic view of the projectile positioning structure with extension cylinder

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Figure 3

A schematic view of the projectile positioning structure with ring set in the groove of the barrel

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Figure 4

A schematic view of self-locking principle

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Figure 5

A schematic view of the projectile positioning structure based on the self-locking principle

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Figure 6

A schematic view of the simplified load conditions of the positioning ring and the conditions for self-locking. (a) The simplified load conditions of the positioning (b) The conditions for self locking.

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Figure 7

Finite element model of the axisymmetric structure

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Figure 8

The 2-D axisymmetric drawing (in mm) of the projectile, positioning ring and barrel. (a) The projectile (b) The positioning ring (c) The barrel.

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Figure 9

The boundary condition

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Figure 10

The pressure-versus-time curve of the 30 mm gun

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Figure 11

The axial displacement contours of the ring and barrel and the von-Mises stress contours of the projectile. (a) The axial displacement contours of the ring and barrel (b) The von-Mises stress contours of the projectile.

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Figure 12

The results of the three structures with different values of upper thickness

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Figure 13

The results of the three structures with different values of lower thickness

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Figure 14

The results of the three structures with different values of height

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Figure 15

The results of the three structures with the same algebraic difference between upper thickness and lower thickness

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