Implementation of Unsteady Double-Axis of Rotation Motion to Predict Pitch-Damping Moment

Abstract

An investigation was performed to verify the implementation of double-axis rotation of a well-studied projectile (Army-Navy Finner) using an existing commercial fluid-flow solver by computing the pitch-damping moment (PDM) in multiple manners and comparing to previously published results. The PDM stability derivative was computed using 3 methods: 1) planar pitching, 2) lunar coning (steady and transient), and 3) equal and opposite coning-spinning motion. The investigation studied the effect of time step for the transient double-axis rotation simulation. Overall, the predicted body moments agreed quite well with results, suggesting that convergence can be achieved with further reduced global time step size. Although the unsteady double-axis rotation implementation study proved to be successful (i.e., verifying that the method can be used in transient simulations of projectiles undergoing complex kinematic motions), it is inefficient, and, therefore, may not be an advisable method to accurately predict PDM.

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Document Details

Document Type
Technical Report
Publication Date
Oct 18, 2016
Accession Number
AD1020435

Entities

People

  • Joseph D. Vasile

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Center Of Gravity
  • Computational Fluid Dynamics
  • Convergence
  • Coordinate Systems
  • Department Of Defense
  • Euler Angles
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • High Performance Computing
  • Military Research
  • Projectiles
  • Rotation
  • Simulations
  • Steady State

Fields of Study

  • Engineering

Readers

  • Aerodynamics/Aeronautics.
  • Control Systems Engineering.
  • Systems Analysis and Design

Technology Areas

  • Space
  • Space - Spacecraft Maneuvers