Modeling, simulation, and analyses of attitude control for the Crew Equipment Retriever (CER) proposed for space station.
Authors
Hansen, Daniel L.
Subjects
CERS
attitude control
minimum fuel
optimal control
Three- Axis Stabilization
Space Station
Free fiver
attitude control
minimum fuel
optimal control
Three- Axis Stabilization
Space Station
Free fiver
Advisors
Burl, Jeff B.
Date of Issue
1989
Date
March 1989
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The Crew. Equipment Retrieval System (CERS) is proposed for space station to
provide the capability to rescue an EVA crewman or to retrieve equipment inadvertently
detached from the station. This research is directed to model, simulate, and analyze attitude
control for the Crew 'Equipment Retriever (CER) with and without a target during
autonomous attitude hold. Time-optimal and weighted-time-fuel optimal control laws
are derived using Pontryagin's Minimum Principle. The CER baseline configuration is
analyzed to accomplish some of the attitude control trade-off analyses planned for the
CER preliminary design phase. Optimal thruster size and placement are evaluated for
three-axis stabilization. Control stability when the moment of inertia tensor changes
during target capture is evaluated for several worst-case scenarios. Attitude control
performance results are computed through computer simulation. Simulation of the CER
baseline configuration shows it does not provide effective control during capture of a
worst-case 850 pound target.
A new CER configuration scheme is proposed, evaluated and compared to the
baseline configuration. Fuel optimal and end-of-mission performance for the new CER
configuration is evaluated. Simulation of the CER proposed configuration shows it
provides effective control during target capture for modified locations in the capture net.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
102 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.