A nonvarying-C* control scheme for aircraft
Rang, Edward R.
MetadataShow full item record
A sum of normal acceleration and pitch rate appears to be the best variable to use to control aircraft in the longitudinal axis. The C*-Criterion specifies that the time response of this quantity called C* must fall in a prescribed envelope for all speeds and altitudes. It is equivalent to requiring the control system to hold the coefficients of a certain equation, which describes the aircraft's short-period motion, fixed. This is done by using feedbacks with variable gains. The gain-changing mechanism is found using gradient techniques. The system was shown to be practical by an analog simulation. It was found to be tolerant of instrument noise, elevator hysteresis, and other complications not accounted in the analytical derivations. The study strongly suggests a modification of the C*-Criterion. It is proposed that the coefficients in the expression of the quantity C* should be representative of the aircraft's parameters rather than have the values currently in use. (Author)
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
NPS Report NumberNPS57RJ9061A
Showing items related by title, author, creator and subject.
Hansen, Darcy Michael (Monterey, California. Naval Postgraduate School, 1991-09);Various computational methods and operational computer codes used to predict the aerodynamic coefficients and separation trajectories of aircraft stores are examined. The semi-empirical aeroprediction code Missile DATCOM ...
A method for determining the tempo of operations aboard aircraft carriers through regression analyses of accidents Gasser, Robert Eugene. (Monterey, California. U.S. Naval Postgraduate School, 1967-06);Although variations in the tempo of flight deck operations aboard an aircraft carrier can be easily detected, no suitable method has been developed to measure this tempo. A method, based on two assumptions, which may solve ...
Jonsson, Haflidi H. (Naval Postgraduate School, 2011-03-07);The Department of Energy conducted the Cloud-Land Surface Interaction Campaign (CLASIC) in Poncha City Oklahoma, in June 2007. The purpose of the experiment was to study the influence of different surface conditions on ...