0
RESEARCH PAPERS: Launch Dynamics

Analysis of Dynamic Characteristics for Rarefaction Wave Gun During the Launching

[+] Author and Article Information
Xiao-bing Zhang

Ballistic Research Laboratory of China, Nanjing University of Science and Technology, 210094, Nanjing, P.R. Chinazhangxb680504@163.com

Ying-ze Wang

Ballistic Research Laboratory of China, Nanjing University of Science and Technology, 210094, Nanjing, P.R. China; Energy and Power Engineering, JiangSu University, 212013, Zhenjiang, P.R. China

J. Appl. Mech 77(5), 051601 (May 17, 2010) (9 pages) doi:10.1115/1.4001289 History: Received July 30, 2009; Revised January 24, 2010; Published May 17, 2010; Online May 17, 2010

Rarefaction wave gun (RAVEN) propulsion has renewed interest in the fundamental limits of recoil reductions attainable by redirecting propellant gases rearward from a gun without compromising the projectile propulsion. Compared with a conventional gun there is a great difference in the launch process and launch structure. This paper is concerned with an analysis of the dynamic characteristics of this high performance weapon system by numerical simulation. Based on its launch mechanism and launch structure, the vibration equation describing the vibration characteristics of RAVEN was established by vibration theory, which considered the actual movement of the projectile and inertial breech by coupling the interior ballistic equations of the rarefaction wave gun. A rigid-flexible dynamic model, which considered the coupling effect between the elastic vibration of the launch barrel and the dynamic behaviors of the other parts of the RAVEN, is established via a subsystem method. The vibration response of RAVEN during the launch is analyzed by numerical simulation. Comparisons are presented based on the conventional gun, as well as the rules of how the different parameters affect the vibration response. During the launching of RAVEN, the launch barrel shows significant vibration due to the effect of the propellant gases, the inertial breech, and the projectile, and there is some reduction in the vibration amplitude compared with that observed in a conventional closed chamber gun. The vibration amplitude and duration of the launch barrel, which increased with a decrease in the loading density, an increase in the mass of the inertial breech and projectile, and a delay of the venting time, is affected in a more significant manner by changes in loading density and the mass of projectile. The coupled effect between the launch barrel and the other parts of RAVEN are most prevalent in the z-direction. The vibration amplitude along the z-direction is higher than that of the y-direction. When the coupled effect is considered, the transverse vibration response of the flexible barrel has some reduction compared with the one that does not exhibit the coupling effect.

Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Image of inertial breech RAVEN

Grahic Jump Location
Figure 2

Image of vibration model of RAVEN

Grahic Jump Location
Figure 3

Distributions of inertial loads caused by a moving inertial breech and projectile

Grahic Jump Location
Figure 4

Axial distributions of the Bourdon load along the barrel

Grahic Jump Location
Figure 5

Time history of the Bourdon load

Grahic Jump Location
Figure 6

Axial distribution of transverse vibrational displacement of the barrel at different times

Grahic Jump Location
Figure 7

Time history of transverse vibrational displacement of the barrel at different positions

Grahic Jump Location
Figure 8

Distribution of transverse vibrational displacement at the muzzle

Grahic Jump Location
Figure 9

Distribution of the rotation angle at the muzzle

Grahic Jump Location
Figure 10

Distribution of transverse vibrational velocity at the muzzle

Grahic Jump Location
Figure 11

Distribution of transverse vibrational acceleration at the muzzle

Grahic Jump Location
Figure 12

Comparative distribution of the transverse vibrational displacement in the muzzle

Grahic Jump Location
Figure 13

Comparative distribution of the axial transverse vibrational displacement of the barrel at various times

Grahic Jump Location
Figure 14

Distribution of the peak value of transverse vibrational displacement at the muzzle position and the duration of the vibrational response due to different factors

Grahic Jump Location
Figure 15

Axial distribution of the transverse vibrational displacement of the launch barrel at the different times

Grahic Jump Location
Figure 16

Distribution of transverse vibrational displacement at the muzzle position

Grahic Jump Location
Figure 17

Distribution of transverse vibrational velocity at the muzzle position

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In