Accession Number:

AD0741769

Title:

Relationship between Local and Effective Aerodynamic Pitch-Damping Derivatives as Measured by a Forced-Oscillation Balance for Preliminary Viking Configurations

Descriptive Note:

Final rept. 1 May-1 Nov 1971

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN

Personal Author(s):

Report Date:

1972-05-01

Pagination or Media Count:

53.0

Abstract:

Forced-oscillation pitch-damping balances oscillating over a small angular amplitude range about a nominal angle of attack yield an effective value of aerodynamic damping if the damping is a nonlinear function of angle of attack. Computer-simulated motion studies lead to developing a procedure to extract the local damping from the output of a forced-oscillation balance. A derivation is given of the basic integral equation relating local and effective damping. The method is applied to three preliminary unmanned Mars reentry Viking model configurations, and the results are discussed.

Subject Categories:

  • Unmanned Spacecraft
  • Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE