Use of the SIMBAD Gun Dynamics Code for Modelling the In-Bore Dynamics of EM Launchers
Abstract
Generic SIMBAD models of various Electro-Magnetic (EM) launchers have been used in the UK for studying model the in-bore phase and launch accuracy issues of such systems. Although many of features of the EM environment are not modelled with any degree of complexity, SIMBAD still provides a useful tool for investigating some of the dominant material and geometric influences on the in-bore dynamics and launch accuracy. Modifications to the SIMBAD code allowed for the simulation of asymmetrical electro-magnetic forces acting on the projectile. Other modifications allowed for the simulation of some of the time varying asymmetries in the forces on the projectile. These have demonstrated that there may be additional EM influences contributing to in-bore projectile balloting. Comparative performance data was produced for three shot designs (U4, U7 and U9 projectiles) simulated being fired from the 90 mm IAP and Task C launchers, and highlighted their typical in-bore performance characteristics. Transverse accelerations on the projectiles showed typical peak values of 6,000 g. higher values and degradation in projectile performance was demonstrated due to increasing wear and distortion in the launcher's core when experimental bore straightness and wear were included. Initial values for projectile exit conditions from the launchers were produced, which demonstrated increased sensitivity of shot jump, pitch and pitch rate in the vertical plane and some important differences between projectile designs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 26, 2001
- Accession Number
- ADP012473
Entities
People
- A. M. Dilkes437
- D. W. Lodge