Mars Science Laboratory: entry, descent and landing system overview
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Mars Science Laboratory entry descent and landing ↗
Engineering topics
Umland, J. W.
Publications and source records attributed to Umland, J. W..
SRTM mast damping subsystem design and failure investigation
A mast vibration damping system was developed for the Shuttle Radar Topography mission. The damping system development is considered from both a system perspective, and a detailed mechanism design viewpoint.
SRTM↗
SRTM mast damping subsystem design and failure investigation
The Space Radar Topography Mission flew in February 2000 on the space shuttle Endeavor as the primary payload for STS-99. The primary product of this mission was a topographic database of 80 percent of the earth's land surface.
SRTM↗
SRTM on-orbit structural dynamics
One of SRTM's significant features is the use of a 60 meter long deployable mast that serves to deploy an outboard antenna and creates a stable baseline.
SRTM↗
SRTM on-orbit structural dynamics
The primary product of the Space Radar Topography Mission was a topographic database of 80 percent of the earth's land surface. The resulting digital terrain data set provides a significant improvement over currently existing global topography data sets.
SRTM↗
Mechanical Design of the Mars Pathfinder Mission
The Mars Pathfinder Mission was a great engineering achievement for the National Aeronautics and Space Administration (NASA) and the Jet Propulsion Laboratory (JPL) which built the Pathfinder Spacecraft and the Sojourner Rover. The mechanical design of the mission hardware was critical to the success of the complex entry sequence and landed operations.
Mars↗
Active member vibration control for a 4 meter primary reflector support structure
The design and testing of a new low voltage piezoelectric active member with integrated load cell and displacement sensor is described. This active member is intended for micron level vibration and structural shape control of the Precision Segmented Reflector test-bed. The test-bed is an erectable 4 meter diameter backup support truss for a 2.4 meter focal length parabolic reflector. Active damping of the test-bed is then demonstrated using the newly developed active members. The control technique used is referred to as bridge feedback. With this technique the internal sensors are used in a local feedback loop to match the active member's input impedance to the structure's load impedance, which then maximizes vibrational energy dissipation. The active damping effectiveness is then evaluated from closed loop frequency responses.
Umland, J. W.↗