Control and Optimization Laboratories
Legendre pseudospectral approximations of optimal control problems
(Springer, 2003)
We consider nonlinear optimal control problems with mixed statecontrol constraints. A discretization of the Bolza problem by a Legendre pseudospectral method is considered. It is shown that the operations of discretization ...
Preliminary design of earth-mars cyclers using solar sails
(American Institute of Aeronautics and Astronautics (AIAA), 2005-01)
Motivated by the concept of using cycler trajectories for Mars return missions, an optimal Earth–Mars cycler is designed for spacecraft that use solar sails. The design is preliminary in the sense that the trajectories are ...
A fast approach to multi-stage launch vehicle trajectory optimization
(American Institute of Aeronautics and Astronautics (AIAA), 2003-08)
We present a fast and accurate approach for computing optimal trajectories for multi-stage launch vehicles. The computational technique is based on the pseudospectral (PS) knotting method implemented in the software package, ...
Design and Control of Libration Point Spacecraft Formations
(The American Institute of Aeronautics and Astronautics (AIAA), 2007-07)
We investigate the concurrent problem of orbit design and formation control around a libration point. Concurrency implies that the design and control problem are simultaneously investigated. Separating the two problems is ...
Naval Postgraduate School - Cyber Summit
(Monterey, California. Naval Postgraduate School, 2009-10-29)
Formal Analysis of Elastically Supported Beam Columns
(1966)
A method is presented for the systematic analysis of elastically supported beam-columns or
tie-bars in which formal notational devices simplify the handling of complicated discontinuous lateral loads.
Various relationships ...
Tip-loaded Cantilever Beams
(1966-12)
The author is Professor of Mechanical Engineering at the U. S. Naval Postgraduate School, Monterey, California, and formerly Director of Engineering Sciences of the Service Bureau Corporation, a subsidiary of IBM. His Ph.D. ...
Behavior of Separation Constants for Finite Gyromagnetic Plasmas
(1965-11)
The type of the functions appearing in the expressions for electromagnetic fields in finite magnetoplasmas depends only on the properties of the medium manifested in separation constants. Theomega-betaplane of the Brillouin ...
Formulation of Stability Conditions for Systems Containing Driven Rotors
(1996-03)
The much maligned energy-sink analysis is revisited to derive stability conditions for a dual-spin spacecraft that is subjected to possible energy additions by the motor torque. Landon's old idea of subtracting the work ...
Low-Earth-Orbit Maintenance: Reboost vs Thrust-Drag Cancellation
(1995-07)
We define the problem of orbit maintenance within an atmosphere as keeping the spacecraft within a specified altitude
band about a mean circular orbit.