1,871 research outputs found
Maximum Entropy/Optimal Projection (MEOP) control design synthesis: Optimal quantification of the major design tradeoffs
The underlying philosophy and motivation of the optimal projection/maximum entropy (OP/ME) stochastic modeling and reduced control design methodology for high order systems with parameter uncertainties are discussed. The OP/ME design equations for reduced-order dynamic compensation including the effect of parameter uncertainties are reviewed. The application of the methodology to several Large Space Structures (LSS) problems of representative complexity is illustrated
Distributed parameter modelling of flexible spacecraft: Where's the beef?
This presentation discusses various misgivings concerning the directions and productivity of Distributed Parameter System (DPS) theory as applied to spacecraft vibration control. We try to show the need for greater cross-fertilization between DPS theorists and spacecraft control designers. We recommend a shift in research directions toward exploration of asymptotic frequency response characteristics of critical importance to control designers
Interferometric Observatories in Earth Orbit
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76217/1/AIAA-1728-623.pd
Application of maximum entropy optimal projection design synthesis to a benchmark problem
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76995/1/AIAA-20955-739.pd
Electrostatic control of a membrane using adaptive feedback linearization
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76357/1/AIAA-1998-4139-522.pd
Accelerated convergence of neural network system identification algorithms via principal component analysis
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76898/1/AIAA-1998-4440-926.pd
The Optimal Projection Equations for Reduced-Order, Discrete-Time Modeling, Estimation, and Control
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/57880/1/DTReduced-OrderDiscrete-TimeModelingEstimationandControl.pd
A homotopy approach to the feedback stabilization of linear systems
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76174/1/AIAA-20236-533.pd
Autonomous system identification and control of MACE II using the Frequency Domain Expert algorithm
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77122/1/AIAA-1999-4586-175.pd
Axial Symmetry and Rotation in the SiO Maser Shell of IK Tauri
We observed v=1, J=1-0 43-GHz SiO maser emission toward the Mira variable IK
Tauri (IK Tau) using the Very Long Baseline Array (VLBA). The images resulting
from these observations show that SiO masers form a highly elliptical ring of
emission approximately 58 x 32 mas with an axial ratio of 1.8:1. The major axis
of this elliptical distribution is oriented at position angle of ~59 deg. The
line-of-sight velocity structure of the SiO masers has an apparent axis of
symmetry consistent with the elongation axis of the maser distribution.
Relative to the assumed stellar velocity of 35 km/s, the blue- and red-shifted
masers were found to lie to the northwest and southeast of this symmetry axis
respectively. This velocity structure suggests a NW-SE rotation of the SiO
maser shell with an equatorial velocity, which we determine to be ~3.6 km/s.
Such a NW-SE rotation is in agreement with a circumstellar envelope geometry
invoked to explain previous water and OH maser observations. In this geometry,
water and OH masers are preferentially created in a region of enhanced density
along the NE-SW equator orthogonal to the rotation/polar axis suggested by the
SiO maser velocities.Comment: 17 Pages, 4 figures (2 color); accepted for publication in Ap
- …