Interior ballistics codes are used to estimate events
within a gun tube as the propellant is ignited and the projectile accelerates
along the barrel. Time-varying chamber pressures, heat transfer to the gun
barrel, and distance and velocity histories of the projectile are certainly some
of the variable of interest. Movement of the parts of the gun, such as recoil of
the entire gun or parts thereof, is also of interest. Once the projectile exits
the barrel, the interior ballistics code has done its job and the travel of the
projectile is predicted using an exterior ballistics code.
Sandia's current internal ballistics code is ONEGUN. The
Sandia report listed below discusses the theory and use of the code. The code
has been run on several computer platforms and has proven to be easily portable.
Also discussed below is a simple 3-degree-of-freedom exterior ballistics code to
continue analysis of the projectile motion where ONEGUN leaves off.
For a copy of the code, contact the
author: dwbarne@sandia.gov
For a copy of the code, contact the
author: dwbarne@sandia.gov.
This is a restricted code and
available to US government agencies only, unless prior permission is obtained.
The
report SAND2000-???? (in progress)
describes in detail the history, theory, application, and limitations of
Sandia’s interior ballistics computer code ONEGUN, the most current interior
ballistics code at Sandia National Laboratories. Although in use for over 30
years, this is the first detailed report on the ONEGUN code. Described herein
is the lumped parameter model used to determine the pressure, temperature, and
position history of projectiles in weapons used with chemical propellants.
Single and dual grain, perforated and non-perforated propellants of various
shapes are modeled. The code has been recently revised to include extensive,
hard-to-find powder properties that previously had to be input separately. It
has seen extensive use at Sandia in typical as well as recoilless weapons and
has been called into service for both fired and firing penetrators, howitzers,
and occasionally small arms.The output of ONEGUN may be used as input to
external ballistics codes such as 3- and 6-degree-of-freedom trajectory codes.
Written in FORTRAN, ONEGUN runs on a personal computer to provide fast answers
to complex interior ballistics problems.
For
a copy of this report, contact the author: dwbarne@sandia.gov
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