Accession Number:

AD0431566

Title:

SOME DYNAMIC ASPECTS OF STABILITY IN LOW-SPEED FLYING MACHINES

Descriptive Note:

Corporate Author:

PRINCETON UNIV NJ

Report Date:

1963-11-01

Pagination or Media Count:

63.0

Abstract:

This report is concerned with a linear time varying approximation to the dynamics of lowspeed flying machines. Simplifications and approximations are applied widely in order to emphasize essential aspects. The range of time variation is described in terms of frozen system loci of the roots corresponding to the predominant mode of a system. The rate of the time variation is described in terms of the deviation from the frozen system approximation. An analog computer study was made to specify quantitatively those rates of time variation which cannot be considered as slow. The longitudinal dynamics of VTOL aircraft is studied as an example in rather general terms. Approximations and the application of root locus methods in terms of the most significant stability derivatives lead to a construction describing the behavior of the oscillatory roots during transition. The results are used in a discussion of the following variable feedback configurations direct feedback adjustments, adaptive feedback, and programmed feedback adjustments.

Subject Categories:

  • Guided Missiles

Distribution Statement:

APPROVED FOR PUBLIC RELEASE