Accession Number:

AD0652683

Title:

APPLICATION OF THE THEORY OF INVARIANCE TO THE SELECTION OF THE PARAMETERS OF A FLIGHT CONTROL SYSTEM,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1966-09-02

Pagination or Media Count:

16.0

Abstract:

Effective inertial feedbacks of angular velocity in aircraft as control objects lead to the appearance of pairs of complex poles with small real negative parts and a negative zero. As a result of this the object becomes oscillatory with a small degree of damping in the presence of a large effect with respect to the derivative. The dynamic characteristics of the object can be improved by introducing a damping circuit, as a result of which, with selection of the appropriate transfer number of the damper, the inertial feedbacks in the object will be compensated. The closed circuit thus becomes invariant with respect to the variable parameters of the object. Realization of the conditions of invariance of the damping circuit is hampered by the presence of dynamic errors of the regulator elements. The reserve of stability is thus reduced and the possibilities of selecting the parameters of the control system are limited. The dynamic characteristics the system can be improved and the reserve of stability can be increased by reducing the dynamic errors of the elements and by the application of different control devices. As the parameters of the object change within wide limits, the conditions of invariance can be preserved by changing the transmission ratio of the damping circuit with the aid of self-adjusting devices. Author

Subject Categories:

  • Flight Control and Instrumentation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE