Ballistics Modeling for Non-Axisymmetric Hypervelocity Smart Bullets

Abstract

A method for calculating the trajectories of guided, non-axisymmetric, hypervelocity projectiles is developed. The method is based on the equations of motion for a rigid body with an internal skid weight and roll wheel, combined with a tabulated set of ballistic coefficients used to specify the aerodynamic forces and moments on the body. The ballistic coefficients can in principle come from experiments or computational fluid dynamics (CFD) calculations. CFD calculations are carried out for a standard bullet (0.308" 168 grain Sierra International) in order to characterize the accuracy given various mesh sizes. The ballistics model is applied to a standard rifle shot in order to demonstrate the epicyclic pitch and yaw behavior. It is then applied to a smart bullet that utilizes a preliminary autopilot algorithm.

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Document Details

Document Type
Technical Report
Publication Date
Jun 03, 2014
Accession Number
ADA602840

Entities

People

  • Bahman Hafizi
  • D. Gordon
  • Scott Douglass
  • Y. Khine

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Aerodynamic Forces
  • Angular Momentum
  • Boundary Layer
  • Computational Fluid Dynamics
  • Coordinate Systems
  • Dynamics
  • Equations
  • Equations Of Motion
  • Exterior Ballistics
  • Fluid Dynamics
  • Fluid Mechanics
  • Mach Number
  • Orientation (Direction)
  • Physics Laboratories
  • Three Dimensional
  • Trajectories

Readers

  • Control Systems Engineering.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • ballistics.

Technology Areas

  • Hypersonics