EDUCATION
Mississippi State University 1991
Master’s of Mechanical Engineering
Mississippi State University 1989
B.S., Mechanical Engineering (Marine Option)
Mississippi State University 1989
Engineer in Training Test (EIT)
SECURITY CLEARANCE: Department of Defense: Secret
PROFESSIONAL EXPERIENCE
Mr. Stewart is a mechanical engineer with 21 years of experience in the custom design of marine and aerospace systems. He has experience with the design, fabrication, assembly, and deployment of full ocean depth rated underwater systems as well as space qualified and terrestrial flight hardware. Mr. Stewart is familiar with and accustomed to the effects of sea water and salt spray on dynamic and static components. He has designed components and systems to withstand the rigors of terrestrial as well as space flight. For 15 years he has employed COSMOS finite element analysis software coupled with Solidworks 3D CAD software to improve and enhance his designs.
Mr. Stewart has provided field support on research ships, Navy ships and military aircraft during engineering and proof of concept tests. He has assisted in the deployment of complete tethered hydrophone arrays and their associated. He has also assisted with installation and flight testing of prototype data acquisition systems on the Air Force P3 aircraft.
Mr. Stewart has experience with design and performance analysis on mechanical systems built for long term operation. He has performed modal analysis as well as shock and random vibration analyses on terrestrial and space flight hardware. He has performed mooring analyses on tethered and subsurface systems.
PROJECT RELATED EXPERIENCE:
Mr. Stewart provided mechanical design and analysis support on the Demonstration and Sciences Experiment (DSX) Experiment Computer System (ECS). He employed COSMOS Finite Element Analysis (FEA) software to convert Solidworks CAD models over to the Finite Element Models (FEM). The ECS was a 6U Compact PCI style ruggedized container designed and built for Geosynchronous Earth Orbit (GEO). The chassis contained a number of 6U VME style circuit cards including a custom designed and built Network Interface Card (NIC). Mr. Stewart performed modal, shock, vibration and thermal analysis on the chassis, the NIC card and the interface connectors. The parameters associated with ruggedized flight hardware design included a launch and second stage separation shock and vibration spectrum, radiation from the Sun and Earth and thermal conduction in deep space vacuum. The DSX flight hardware was field tested at a shock and vibration testing facility. All components performed as designed and are now awaiting a 2013 launch.
Mr. Stewart designed an ultra-lightweight Aluminum enclosure for the Small Unmanned Aerial Vehicle (SUAV) 2 channel sig-int receiver. Modal analysis was employed to minimize the effect of low frequency vibration in the enclosure. COSMOS was also employed to perform a thermal analysis. Conduction, convection and radiation were all considered in the thermal design. The enclosure had to be lightweight but also capable of withstanding large shock loads (forced landings) as well as dissipate almost 12 watts of heat generated by the electronics.
On the Special Interest Nanosatellite On-Demand (SINOD) effort Mr. Stewart designed a lightweight ruggedized Aluminum enclosure intended for launch on a cube-sat satellite. Requirements for survivability revolved around thermal survival in deep space with and without direct radiation from the Sun. The enclosure also had to survive launch. Modal, shock and thermal analyses were performed on the enclosure.
Mr. Stewart was the mechanical engineer in charge of the design, manufacture, and assembly of the DAMPS (Denied Area Measurement and Processing System). The system is designed as a mobile workstation employing three Hewlett Packard single board computers mounted in a 6U VME chassis. The main unit contains all of the electronics for system functionality including a flat screen display, keyboard, 4 2-gigabyte hard drives and miscellaneous peripheral devices. The computer mounts to a docking station that provides telemetry connections and power. The system has completed several successful field tests on a US Navy P3 aircraft.
Mr. Stewart served as the lead mechanical engineer on the Sonobuoy Wave Energy Module (SWEM) system. He designed the drag mechanism for the module using COSMOS Flow Simulation Computational Fluid Dynamics (CFD) software. He built a number of prototype drive mechanisms including a cam follower and ball screw. He redesigned the SWEM generator in a 3 phase configuration to fit into a typical A size sonobuoy housing. The SWEM unit was field tested April 2012. It generated approximately 2 watts continuous power in Sea State 0 (less than 1 foot waves).
Mr. Stewart worked as the lead mechanical design and Program Manager (PM) on the Advanced Laser Interferometric Gravitational wave Observatory (LIGO) voice coil actuators. The contract was a Firm Fixed Price (FFP) contract to build two different size permanent magnet voice coil actuators for the National Science Foundation (NSF) funded LIGO project. The actuators were designed to operate in an high vacuum state with no thermal dissipation due to convection. To date over 200 of each size actuator have been built and integrated into the LIGO facilities.
Mr. Stewart performed a complete redesign of the NAVO Godzilla Spar buoys. He modeled the pressure vessels, electronics, flotation and mooring. He ran Finite Element Analysis (FEA) on the pressure vessels and electronics. He submitted calculations for weight in water, weight in air, volume, center of buoyancy and overall positive buoyancy of the buoy systems. He performed a mooring analysis on the buoy framework. The buoys have been deployed in the South China Sea and have exceeded the NAVO performance requirements. Eight units have been built to date.
Mr. Stewart designed the field ready ARMY Ground Penetrating Radar (GPR) mobile cart. The cart is of welded Aluminum construction with on-board operating and data acquisition hardware. It is designed to make low speed passes over buried ordinance. The cart ha...
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