Accession Number : AD0920127

Title :   Methods for Predicting the Longitudinal Damping Coefficients for Vertical Acceleration and Pitch.

Descriptive Note : Final rept. Sep 72-Nov 73,

Corporate Author : FLORIDA UNIV EGLIN AFB GRADUATE ENGINEERING CENTER

Personal Author(s) : Conlan, R. W.

Report Date : FEB 1974

Pagination or Media Count : 52

Abstract : Methods for predicting values for vertical acceleration and pitch are presented. The instantaneous formulation is examined by use of the indicial response technique applied to a linear second order differential equation for nondimensional pitching moment as a function of time. Various examples of indicial responses are examined to determine under what conditions vertical acceleration and pitch may be considered time independent. A potential fluid method referred to as the method of Inertial Coefficients is used to find vertical acceleration and pitch for those cases where the fluid is free of vorticity and vortex lines. This technique is subsequently supplanted by a more general method using Allen's Crossflow Theory and a variety of slender body equations applicable to the analysis. The report is written to provide sufficable to the analysis. The report is written to provide sufficient theory, equations, and references to find vertical acceleration and pitch slender bodies with fore and aft wings in the presence of body or wing induced vortices.

Descriptors :   (*WING BODY CONFIGURATIONS, AERODYNAMIC CHARACTERISTICS), (*PITCH(MOTION), DAMPING), (*MATHEMATICAL PREDICTION, COEFFICIENTS), AERODYNAMIC STABILITY, VORTICES, INTERFERENCE, INTEGRAL TRANSFORMS, DIFFERENTIAL EQUATIONS, GRAPHICS, TRANSFER FUNCTIONS, ANGLE OF ATTACK, INTEGRAL EQUATIONS, TAYLORS SERIES, FLOW FIELDS, EQUATIONS OF MOTION, CROSS FLOW, SLENDER BODIES, MATHEMATICAL MODELS, VELOCITY, DRAG, LIFT, OSCILLATION, FLUID DYNAMICS, FLUID MECHANICS, BODIES OF REVOLUTION, FINS, THEORY, GUIDED MISSILES, BOUNDARY LAYER, FLOW SEPARATION.

Subject Categories : Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE