Detection and Mitigation of Transient Instabilities in Deployable Booms
No abstract provided
Balas, M.↗
Engineering topics
Bayard, D.
Publications and source records attributed to Bayard, D..
Pointing accuracy and stability recent JPL experience
Explore the source record for details and available documents.
SIRTF Cassini Galileo Mars Global Surveyor pointin↗
An Optimization Approach to Orienting Three Spacecraft Reaction Wheel Actuators with Application to the Europa Orbiter
This report introduces an optimization approach to finding the best way to orient three reaction wheels on an orbiting spacecraft.
reaction wheel optimal design actuators Europa↗
A Simple Analytic Method for Computing Instrument Pointing Jitter
Pointing jitter refers to camera motion occurring during an image exposure of specified duration.
pointing control jitter spacecraft instruments com↗
Guidance and Control for Mars Atmospheric Entry: Adaptivity and Robustness
In this paper, we address the atmospheric entry guidance and control problem for Mars precision landing.
Aerospace Systems Adaptive Control Guidance and Co↗
On the LTI Properties of Adaptive Feedforward Systems with Tap Delay-Line Regressors
It is shown that an adaptive system whose regressor is formed by tap delay-line (TDL) filtering of a multitone sinusoidal signal is representable as a parallel connection of a linear time-invariant (LTI) block and a linear time-varying (LTV) block.
tap delay-line (TDL) filtering linear time-invaria↗
Stable Direct Adaptive Periodic Control of Nonminimum-Phase Systems
The main contribution of this paper is to put stability requirements for convergence of direct adaptive periodic controllers on equal footing with requirements for indirect adaptive periodic control. The resulting stability conditions are simply that the plant order and delay are known a-priori.
robust↗
Stable Direct Adaptive Periodic Control Using Only Plant Order Knowledge
The main contribution of this paper is to put stability requirements for convergence of direct adaptive periodic controllers on equal footing with requirements for indirect adaptive periodic control, as set forth by Lozano. The resulting stability condition is simply that the plant order is known a priori. No other prior plant knowledge is used (e.g., relative degree, high-frequency gain, etc.), and persistent excitation is not required. More importantly, no assumption or knowledge is required as to whether the plant is minimum or nonminimum phase. A numerical example is given to demonstrate the method, and some guidelines are given for improving the adaptive transient response.
sampling↗
Instrument Pointing Tracking and Vibration Suppression Using Zero Annihilation Periodic Control
In Zero Annihilation Periodic control, the control gains vary periodically in time, in sharp contrast to conventional controllers whose control gains are fixed in time.
instrument pointing tracking and vibration suppres↗
High-Order Multivariable Transfer Function Curve Fitting: Algorithms, Space Matrix Methods and Experimental Results
This paper develops a computational approach to multivariable frequency domain curve fitting, based on 2-norm minimization.
matrix; parameter estimation; sparse matrices; mat↗
Statistical Plant Set Estimation Using Schroeder-Phased Multisinusoidal Input Design
In this paper, a frequency domain method is developed for plant set estimation.
robust↗
On-Orbit System Identification
Information derived from accelerometer readings benefits important engineering and control functions. Report discusses methodology for detection, identification, and analysis of motions within space station. Techniques of vibration and rotation analyses, control theory, statistics, filter theory, and transform methods integrated to form system for generating models and model parameters that characterize total motion of complicated space station, with respect to both control-induced and random mechanical disturbances.
Mettler, E.↗