The uncertain optimization problem for structural dynamic responses of artillery systems is studied from the perspective of uncertainty and system engineering. First, a rigid–flexible coupl...

Interval optimization for structural dynamic responses of an artillery system under uncertainty

A nonlinear stochastic programming method is proposed in this article to deal with the uncertain optimization problems of overall ballistics. First, a general overall ballistic dynamics model is ac...

An uncertain optimization method for overall ballistics based on stochastic programming and a neural network surrogate model

Analysis of the vulnerability of MEMS tuning fork gyroscope during the gun launch

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The Temperature Field Pattern of Small Caliber Automatic Gun

: 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

Use of the SIMBAD Gun Dynamics Code for Modelling the In-Bore Dynamics of EM Launchers

Transverse motion of a projectile during launch is detrimental to firing accuracy, structural integrity, and/or on-board electronics performance of the projectile. One manifest contributing factor to the undesired motion is imperfect bore centerline straightness. This paper starts with the presentation of a deterministic barrel model that possesses both vertical and lateral deviations from centerline in accordance with measurement data, followed by a novel approach to simulating comprehensive barrel centerline variations for the investigation of projectile balloting 1 motions. A modern projectile was adopted for this study. In-bore projectile responses at various locations of the projectile while traveling through the simulated gun tubes were obtained. The balloting was evaluated in both time and frequency domains. Some statistical quantities and the significance were outlined.

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Michael M. Chen

Papers

Projectile Balloting Attributable to Gun Tube Curvature