Start Date
4-1969 8:00 AM
Description
In the design of a launch vehicle attitude control system two factors of major concern are the bending moments experienced during flight and the terminal drift. Excursions in these system variables are produced by winds, the most important of which occur during the period surrounding maximum dynamic pressure. Conventional design approaches assume a linear control law and determine gain values and shaping networks based on a great many complex and interacting considerations (e.g.,bending, sloshing, the nature of winds, separation dynamics, etc.) in order to meet bending moment and drift requirements. The result is a linear control law with gains which are switched between two or more fixed values during the flight.
A number of investigators have treated the problem from the standpoint of determining an optimal control law which will minimize a cost function based on either bending moment, drift, or a combination of these. In many cases, the models include bending dynamics, however, the effects of wind disturbances are not present during the minimization.
Sensitivity and Optimization Theory for Launch Vehicle Attitude Control System Synthesis
In the design of a launch vehicle attitude control system two factors of major concern are the bending moments experienced during flight and the terminal drift. Excursions in these system variables are produced by winds, the most important of which occur during the period surrounding maximum dynamic pressure. Conventional design approaches assume a linear control law and determine gain values and shaping networks based on a great many complex and interacting considerations (e.g.,bending, sloshing, the nature of winds, separation dynamics, etc.) in order to meet bending moment and drift requirements. The result is a linear control law with gains which are switched between two or more fixed values during the flight.
A number of investigators have treated the problem from the standpoint of determining an optimal control law which will minimize a cost function based on either bending moment, drift, or a combination of these. In many cases, the models include bending dynamics, however, the effects of wind disturbances are not present during the minimization.
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