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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Electromagnetic Compatibility Test and Analysis Campaign of NASA's Mars 2020 Rover
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Aeroacoustic Results from Common Research Model Testing and Analysis
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Modernizing Single Event Effect Test and Analysis Methods for Complex FPGA Applications
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Update on NEPP SEE FPGA Test and Analysis Featuring: The Lattice Avant TSMC 16 nm FinFet, The Xilinx TSMC 7nm Versal AIE Core, and Fluence to Failure Applied Methodologies
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Thermal Design, Analysis, and Testing of a Conductively-Cooled, High Temperature Superconducting Rotor for a 1.4 MW Electric Machine for Aeronautics Applications
This presentation covers the second ever demonstration of a superconducting rotor cooled only via conductive connection to a cryocooler, i.e., without pumped or solid cryogens. The full-scale rotor was operated statically in its intended environment – about 1e-3 torr vacuum with only conductive cooling through mechanical connections to a cryocooler contained on the rotor. Stable operation of the rotor in a representative magnetic environment was demonstrated up to its rated direct current (57.2 A) and the designed temperature limit for the superconductor (62 K). In all but one case, the observed temperature gradient between the cold tip and superconducting coils satisfies the design but with little margin. Thermal modeling and correlation with test data is presented identifying the areas of largest discrepancy. Opportunities to reduce the temperature gradient are identified.
PSL ASME Nozzle Test: Uncertainty Analysis Methods and Results
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Structural Analysis and Testing of Multi-nut Joint for TriTruss Structure
Axial and bending tests for a multi-nut joint in the TriTruss structure were conducted at NASA Langley Research Center (LaRC). This report describes the test procedures used for the axial and bending tests of the multi-nut joint, along with the test results. The joint's equivalent axial stiffness (EA) and equivalent bending stiffness (EI) were characterized based on these test results and are presented in this report. Additionally, finite element models (FEMs) of the axial and bending test specimens were developed, and the predicted axial and bending responses of the multi-nut joint were compared and validated with the test results.
NASA’s Quiet Electric ENgines (QUEEN): Thermal Analysis and Testing of the Electronic Speed Controller (ESC)
An electric ducted fan system was tested at the NASA Glenn Research Center. Main components of the system include a commercial-off-the-Shelf (COTS) fan and motor, electronic speed controller, and cooling system. Motor speed, voltage, current, and temperatures were measured in this static ground test of the propulsor. The thermal performance of the Electronic Speed Controller (ESC) was also measured using two different methods to cool the ESC: air cooling and cold plate cooling. This propulsor prototype is one of NASA’s Quiet Electric ENgines (QUEENs) and is designated the ‘QUEEN V1.’ The Quiet Electric Engines are being developed for the 25% scale model of the Subsonic Single Aft Engine (SUSAN) Flight Research Vehicle and are intended to explore the potential of distributed electric propulsion for large regional single-aisle aircraft. Lessons learned will be used to guide development of future QUEEN prototypes and thermal management systems.
Ongoing Research and Development: Cement Filler Testing and Analysis.
Abstract not provided.
Ongoing Research and Development: Cement Filler Testing and Analysis.
Abstract not provided.
Ongoing Research and Development: Cement Filler Testing and Analysis.
Abstract not provided.
Ongoing Research and Development: Cement Filler Testing and Analysis.
Abstract not provided.
Experiments with Test Case Generation and Runtime Analysis
Software testing is typically an ad hoc process where human testers manually write many test inputs and expected test results, perhaps automating their execution in a regression suite. This process is cumbersome and costly. This paper reports preliminary results on an approach to further automate this process. The approach consists of combining automated test case generation based on systematically exploring the program's input domain, with runtime analysis, where execution traces are monitored and verified against temporal logic specifications, or analyzed using advanced algorithms for detecting concurrency errors such as data races and deadlocks. The approach suggests to generate specifications dynamically per input instance rather than statically once-and-for-all. The paper describes experiments with variants of this approach in the context of two examples, a planetary rover controller and a space craft fault protection system.
Development of test methods for scale model simulation of aerial applications in the NASA Langley Vortex Research Facility
As part of basic research to improve aerial applications technology, methods were developed at the Langley Vortex Research Facility to simulate and measure deposition patterns of aerially-applied sprays and granular materials by means of tests with small-scale models of agricultural aircraft and dynamically-scaled test particles. Interactions between the aircraft wake and the dispersed particles are being studied with the objective of modifying wake characteristics and dispersal techniques to increase swath width, improve deposition pattern uniformity, and minimize drift. The particle scaling analysis, test methods for particle dispersal from the model aircraft, visualization of particle trajectories, and measurement and computer analysis of test deposition patterns are described. An experimental validation of the scaling analysis and test results that indicate improved control of chemical drift by use of winglets are presented to demonstrate test methods.