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Program:
Orbital Boost Vehicle, Title: Guidance, Navigation and Controls
Engineer, Duties: Computer-aided Control System Design model capture,
development, verification, reconciliation, and validation for launch
vehicle stage 1 electro-hydraulic Thrust Vector Control System. Flight
proven in February 2003.
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Program:
Internet Optical Crossconnect (visualization), Title: Mechatronics
Engineer, Duties: Design, development, testing, and FPGA implementation
of 4 mm MEMS based fast-steering mirror control algorithms for rapid
precision pointing, structural vibration mitigation, and earthquake
disturbance rejection.
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Program:ISS
Beta Gimbal Assembly Electronic Control, Title: Control Engineer,
Duties: Performed Electronic Control Unit (ECU) troubleshooting and
repair including firmware and electronics for torque motor control and
motor commutation. ECU system level modeling and analysis. Led
technical manual development. Developed an integrated, high fidelity
Electronic Control Unit/ Beta Gimbal Assembly/ Flexible Solar Array
systems simulation. Analysis and prediction of controls/ structure
interaction effects and system level performance for off-nominal
scenarios. Synthesis of contingency controllers for off-nominal
on-orbit modal variations. Assembly presently in orbit. Development of
flexible link space robot manipulator mathematical models for precision
pointing controls development and integration into full-up spacecraft
system model.
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Program:
Space Integrated Controls Experiment, Title: Simulation/Control
Engineer, Duties: Developed a MIMO, hybrid-time, active structural
dynamics controller for a flexible space telescope using the high
authority/ law authority (HAC/ LAC) control approach. The HAC portion
of the controller was synthesized using the H-infinty control
methodology and implemented digitally. The LAC portion was implemented
analog. The actuators consisted of eighteen proof-mass actuators.
Eighteen collocated accelerometers were used as sensors for feedback.
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Program:
Space Based Laser Actuator/Isolator, Title: Technical Director, Duties:
Led the systems engineering effort for an SBL actuator/isolator. This
included the development and preparation of trade studies in the areas
of configuration, power, weight, size, performance and cost.
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Program:
Space Active Vibration Isolator Development, Title: Control Engineer,
Duties: Participated in the development of a six degree-of-freedom
hexapod pointing mount including mathematical modeling, controls
synthesis, computer simulation, hardware integration and test. The
pointing mount consisted of an active vibration isolation system utilizing
a dual-mode approach that combined magnetic actuators with linear
actuators. The laboratory environment included a forward body zero-g
suspension system and aft body controls, all of which were modeled and
simulated.
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Program:
IRIDIUM Modeling Validation & Verification, Title: Orbital Control
Engineer, Duties: IRIDIUM space vehicle environment, actuation,
sensing, and multi-body dynamics modeling validation and verification.
Also, responsible for interface electronics validation, ACS/ OCS
hardware-in-the-loop test result analysis and reconciliation, as well
as observer dynamics performance verification.
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Program:
Precision Gimbal Modeling, Simulation and Analysis, Title: Control
Engineer, Duties: Discrete-time control of antennae pointing gimbals
for jitter reduction and accuracy analysis. Derived methods of
utilizing digital torque motor commutation for ripple and cogging
mitigation.
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Program:
Vibration, Isolation, Steering & Suppression System, Title: System/
Control Engineer, Duties: Synthesized a precision optical bench
controls architecture to provide simultaneous optical payload steering,
active suppression of optical payload attached disturbances such as
those emanating from cryocoolers, and hybrid isolation of optical
payload from spacecraft bus borne disturbances.
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Program:
Magnetically Suspended Control Moment Gyroscope, Title: Control/
Systems Engineer, Duties: Performed system architecture trades and system
modeling and control including gyrodynamics. Patent pending for
innovative control architecture that permits requisite MAGCMG torque
generation while maintaining nominal magnetic actuator gaps and
vibration isolation in 6 DOF. Developed electronic circuitry that
permitted the gap observed by the magnetic actuator to be ascertained
based on the actuator’s self-inductance. Also examined ways of reducing
actuator-induced vibration disturbances.
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Program:
Special Sensor Magnetometer Passive Utility Damper, Title: Control
Engineer, Duties: Performed structural damping robust performance
analysis for a tuned mass damper device interacting with a low
structurally damped flexible mast in the space environment.
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Program:Gyroscope/Reaction
Wheel Simulation, & Analysis, Title: Control Engineer, Duties:
Control moment gyroscope & reaction wheel modeling and simulation
for stability and performance analysis as well as system sizing and
requirements validation.
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Program:
Bearing Cage/Retainer Dynamic Stability Analysis, Title: Dynamics
Engineer, Duties: Control moment gyroscope rotor spin bearing
mechanical dynamics modeling and simulation for retainer stability criteria
and to analyze which factors may contribute to extending the bearing's
life.
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Program:
ISS Drive Lock Assembly Control Circuitry, Title: Electrical/Control
Engineer, Duties: Developed, modeled, and tested electronic control circuitry
which provided position and rate control for the ISS solar array Alpha
Joint motor during test. This circuitry included digital motor
commutation for the brushless DC motor.
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