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Re-Entry Vehicle Control System Design and Mechanization.


AD485616

Publication Date 1966
Personal Author Scharmack, D. K.; Ward, M. D.
Page Count 206
Abstract A nonlinear optimal feedback control scheme for controlling a vehicle re-entering the earth's atmosphere from lunar return initial conditions is reported. The optimal feedback control law used in the scheme is obtained from a multi-dimensional surface fit of the control function for several optimal trajectories. Partials of the control with respect to the state vector are included in the fitting procedure. The functional minimized by the trajectories is the total (convective plus radiative) stagnation point heat. The feedback control scheme is developed, and several re-entry trajectories are suaui bserved, and large (although tolerable) terminal point errors occur. It is believed that the terminal errors can be greatly reduced, if necessary. A powerful predictor scheme is developed which allows optimal a function of a parameter. This is used to exttend the range of an optimal trajectory, to perform an absolute minimum test, and to map the optimal re-entry corridor. Sufficiency tests for a relative minimum are mechanized, and it is shown that the trajectories considered are minimizing paths. (Author)
Keywords
  • Reentry vehicles
  • Flight control systems
  • Feedback
  • Optimization
  • Lunar craft
  • Descent trajectories
  • Partial differential equations
  • Heat transfer
  • Stagnation point
  • Errors
  • Mathematical prediction
  • Nonlinear systems
  • Range(Distance)
  • Acceleration
  • Simulation
  • Polynomials
  • Numerical analysis
  • Functions(Mathematics)
  • Mathematical analysis
  • Numerical methods and procedures
  • Design
  • Lunar trajectories
Source Agency
  • Non Paid Delimited ADS
NTIS Subject Category
  • 84C - Manned Spacecraft
Corporate Authors Honeywell Inc Minneapolis Minn
Document Type Technical Report
Title Note Final rept. 1 Jun 64-1 Aug 65.
NTIS Issue Number 197713
Contract Number
  • AF 33(615)-1858
Re-Entry Vehicle Control System Design and Mechanization.
Re-Entry Vehicle Control System Design and Mechanization.
AD485616

  • Reentry vehicles
  • Flight control systems
  • Feedback
  • Optimization
  • Lunar craft
  • Descent trajectories
  • Partial differential equations
  • Heat transfer
  • Stagnation point
  • Errors
  • Mathematical prediction
  • Nonlinear systems
  • Range(Distance)
  • Acceleration
  • Simulation
  • Polynomials
  • Numerical analysis
  • Functions(Mathematics)
  • Mathematical analysis
  • Numerical methods and procedures
  • Design
  • Lunar trajectories
  • Non Paid Delimited ADS
  • 84C - Manned Spacecraft
  • AF 33(615)-1858
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