Ball Obturation of a Spin Stabilized Tubular Projectile.

Abstract

An analytical model was constructed to predict the response of the ball obturator in a ball obturated, spin stabilized tubular projectile (BOT). Torques acting on the obturator were considered to be due to fluid and sliding friction forces. An experimental apparatus was designed, and built to simulate the BOT. Data obtained were the times required for the obturator to nutate through a known angle over a range of projectile angular velocities. Utilizing published coefficient of sliding friction information and a linear approximation of the exact solution, the trend in the data to go through a minimum value was duplicated. A least squares fit of the linear approximation to the data allowed the formulation of a new sliding friction coefficient. Using this value, values from the exact solution and the experimental data was constructed. The correlation is extremely good so that confidence in the predictive capabilities of the model was gained.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1980
Accession Number
ADA092410

Entities

People

  • James Wayne Bloomer Ii

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Aerodynamic Forces
  • Boundary Layer
  • Computational Science
  • Differential Equations
  • Equations Of Motion
  • Experimental Data
  • Fluid Dynamics
  • Fluid Flow
  • Friction
  • Geometry
  • Mach Number
  • Mechanical Engineering
  • Molecular Dynamics
  • Pressure Distribution
  • Projectiles
  • Sliding Friction

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Regression Analysis.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).