Research & Technology 1998

Materials
MoSi₂-Base Structural Composite Passed Engine Test
Deleterious Phase Formation in Next-Generation Nickel-Base Superalloys Predicted
Affordable Manufacturing Technologies Being Developed for Actively Cooled Ceramic Components
Sensor Lead Wires Positioned on SiC-Based Monolithic Ceramic and Fiber-Reinforced Ceramic Matrix Composite Subcomponents With Flat and Curved Surfaces
Modal Acoustic Emission Used at Elevated Temperatures to Detect Damage and Failure Location in Ceramic Matrix Composites
High-Temperature Solid Lubricants Developed by NASA Lewis Offer Virtually "Unlimited Life" for Oil-Free Turbomachinery
New Vapor/Mist Phase Lubricant Formulated
Monte Carlo Simulation of Alloy Design Techniques: Fracture and Welding Studied Using the BFS Method for Alloys
Low-Cost, High Glass-Transition Temperature, Thermosetting Polyimide Developed
Novel Ultraviolet-Light-Curable Polyimides
10 000-hr Cyclic Oxidation Behavior of 68 High-Temperature Co-, Fe-, and Ni-Base Alloys Evaluated at 982 ° C (1800 ° F)
Single-Crystal NiAl-X Alloys Tested for Hot Corrosion
Thermal Mechanical Stability of Single-Crystal-Oxide Refractive Concentrators Evaluated for High-Temperature Solar-Thermal Propulsion

Power and On-Board Propulsion Technology
Solar Array Verification Analysis Tool (SAVANT) Developed
Space Plasma Shown to Make Satellite Solar Arrays Fail
Lithium-Ion Polymer Rechargeable Battery Developed for Aerospace and
Military Applications
Cathodes Delivered for Space Station Plasma Contactor System
High-Performance Bipropellant Engine
Liquid Bipropellant Microrocket Concept Under Development
Ion Thruster and Power Processor Developed for the Deep Space 1 Mission
Advanced Refrigerator/Freezer Technology Development Project
Power System Optimization Codes Modified
Lightweight Battery Charge Regulator Used to Track Solar Array Peak Power
International Low-Earth-Orbit Spacecraft Materials Test Program Initiated for Better Prediction of Durability and Performance
Retrieval of Mir Solar Array
Thermal Control Replacement Materials Evaluated for Durability and Selected for the Hubble Space Telescope
Effects Investigated of Ambient High-Temperature Exposure on Alumina-Titania High-Emittance Surfaces
Polymers Erosion and Contamination Experiment Being Developed
Synchrotron Vacuum Ultraviolet Light and Soft X-Ray Radiation Effects on Aluminized Teflon FEP Investigated
Teflon FEP Analyzed After Retrieval From the Hubble Space Telescope
Highly Conducting Graphite Epoxy Composite Demonstrated
Changes in the Optical Properties of Materials Are Observed After 18 Months in Low Earth Orbit
Low-Temperature Electronic Components Being Developed
Atomic Oxygen Lamp Cleaning Facility Fabricated and Tested
Parallel Stirling Converters Being Developed for Spacecraft Onboard Power
Inflatable Solar Thermal Concentrator Delivered

Instrumentation and Controls
Acoustic Pyrometry Applied to Gas Turbines and Jet Engines
Scanning Mode Shock Position Sensor Invented and Demonstrated
Pressure-Sensitive Paint Applied to Ice Accretions
Neural Networks Used to Compare Designed and Measured Time-Average Patterns
Nondestructive Strain Measurement System Used to Determine Surface Strain on Fibers
High Reliability Engine Control Demonstrated for Aircraft Engines
Distortion Tolerant Control Flight Demonstration Shown to Be Successful
Combustion Instabilities Modeled

Communications Technology
Web Transfer Over Satellites Being Improved
Advances Made in the Next Generation of Satellite Networks
Internet Protocol Enhanced Over Satellite Networks
Satellite ATM Networks: Architectures and Guidelines Developed
Broadband Satellite Technologies and Markets Assessed
A More Accurate and Efficient Technique to Obtain Helical Traveling-Wave Tube Interaction Impedance Using Computational Methods
Diamond Analyzed by Secondary Electron Emission Spectroscopy
Finite Ground Coplanar (FGC) Waveguide: Characteristics and Advantages Evaluated for Radiofrequency and Wireless Communication Circuits
Angular Distribution of Elastically Scattered Electrons Determined and Its Effect on Collector Performance Computed
Thin-Film Ferroelectric Tunable Microwave Devices Being Developed
Technique Developed for Optimizing Traveling-Wave Tubes
Cassini Radio Science Experiments on Saturn and Titan Preserved Because of Lewis Analysis
Novel Low-Cost, Low-Power Miniature Thermionic Cathode Developed for Microwave/Millimeter Wave Tube and Cathode Ray Tube Applications
K-Band Phased Array Developed for Low-Earth-Orbit Satellite Communications
Conformal, Transparent Printed Antenna Developed for Communication and
Navigation Systems
Innovative, Inexpensive Etching Technique Developed for Polymer Electro-
Optical Structures
High-Performance, Low-Complexity Codes Researched for Communication Channels
Reconfigurable Data Communications Packet-Switch Emulation Test Bed Demonstrated
Bandwidth-Efficient Wireless Digital Modem Developed
622-Mbps Orthogonal Frequency Division Multiplexing Modulator Developed
Silicon-Germanium Fast Packet Switch Developed for Communications Satellites

Turbomachinery and Propulsion Systems
Multistage Turbomachinery Flows Simulated Numerically
Optical Flow-Field Techniques Used for Measurements in High-Speed Centrifugal Compressors
LeRC-HT: NASA Lewis Research Center General Multiblock Navier-Stokes
Heat Transfer Code Developed
Research Data Acquired in World-Class, 60-atm Subsonic Combustion Rig
X-33 Combustion-Wave Ignition System Tested
Use of Atomic Fuels for Rocket-Powered Launch Vehicles Analyzed
NASA/FAA Tailplane Icing Program Completed
National Transportation Safety Board Aircraft Accident Investigation Supported
Microelectrical Mechanical Systems Flow Control Used to Manage Engine Face Distortion in Compact Inlet Systems
Two-Dimensional Bifurcated Inlet/Engine Tests Completed in 10- by 10-Foot Supersonic Wind Tunnel
WIND Flow Solver Released
Results of Liquid Motion Experiment Analyzed
Rapid Chill and Fill of a Liquid Hydrogen Tank Demonstrated
Zero Boiloff Storage of Cryogenic Propellants Achieved at Lewis' Supplemental Multilayer Insulation Research Facility
Engineering Application Integration Architecture Devised
Space-Time Conservation Element and Solution Element Method Being Developed

Structures and Acoustics Division
Nondestructive Evaluation Correlated With Finite Element Analysis
Deformation Behaviors of HIPped Foil Compared With Those of Sheet Titanium Alloys
Thermomechanical Fatigue Durability of T650-35/PMR-15 Sheet-Molding Compound Evaluated
"Ultra"-Fast Fracture Strength of Advanced Structural Ceramic Materials Studied at Elevated Temperatures
Viscoplastic Constitutive Theory Demonstrated for Monolithic Ceramic Materials
Resistance of Titanium Aluminide to Domestic Object Damage Assessed
Multiaxial Experiments Conducted to Aid in the Development of Viscoplastic Models
Multidisciplinary Probabilistic Heat Transfer/Structural Analysis Code
Developed--NESTEM
Design Tool Developed for Probabilistic Modeling of Ceramic Matrix Composite Strength
CARES/Life Ceramics Durability Evaluation Software Enhanced for Cyclic Fatigue
Novel Method Used to Inspect Curved and Tubular Structural Materials
Composite Nozzle/Thrust Chambers Analyzed for Low-Cost Boosters
Flutter Version of Propulsion Aeroelasticity Code Completed
Stability of the Tilt Modes of an Actively Controlled Flywheel Analyzed
Dual-Laser Probe for Measuring Blade-Tip Clearance Tested
Time-Shifted Boundary Conditions Used for Navier-Stokes Aeroelastic Solver
Low-Noise Potential of Advanced Fan Stage Stator Vane Designs Verified in NASA Lewis Wind Tunnel Test
NASA Space Mechanisms Handbook--Lessons Learned Documented
Metrology Evaluation of Superfinished Gears Completed
Three-Dimensional Gear Crack Propagation Studied
NASA Lewis Thermal Barrier Feasibility Investigated for Use in Space Shuttle Solid-Rocket Motor Nozzle-to-Case Joints

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