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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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At least 829 records · Page 46

All sources NASA NTRS DOE OSTI

NASA NTRSDate not supplied

Lessons Learned in Systems Engineering Availability and Recommendations for Mission Technical Leaders

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Lessons Learned↗

NASA NTRS2022

NESC Technical Bulletin 22-03: Treatment of Transient Pressure Events in Space Flight Pressurized Systems

Analytical and experimental evidence shows that fast-moving dynamic pressure fluctuations caused by valve actuation, fluid system priming, fluid discharge, vibration, and flow disturbances can elicit adverse structural response and must be considered in the space flight pressure system verification process.

Transient Pressure↗

NASA NTRS2022

NASA Engineering and Safety Center Technical Bulletin No. 22-04: Uncertainty Quantification of Reduced Order Structural Dynamic Models

Uncertainty quantification (UQ) provides statistical bounds on prediction accuracy based on finite element model (FEM) uncertainty. An alternate method for UQ, called the Hybrid Parametric Variation (HPV) combines a parametric variation of the Hurty/Craig-Bampton (HCB) fixed-interface (FI) modal frequencies with a nonparametric variation (NPV) method. This provides a UQ method that can be traced to test data, which can be updated as additional data and improved correlated models become available.

Uncertainty Quantification↗

NASA NTRS2022

NASA Engineering and Safety Center Technical Bulletin No. 22-07; Helium Solubility in MMH and NTO

A test program to characterize the solution of helium in nitrogen tetroxide/mixed oxides of nitrogen (NTO)/(MON) and monomethylhydrazine (MMH) at anticipated flight-representative pressures/temperatures was completed. Updated relations for helium solubility in MMH and NTO were generated and documented.

Helium Solubility↗

NASA NTRS2023

NASA Engineering and Safety Center Technical Bulletin No. 23-01: Including Key Design Features in Safety-Critical Pyrotechnic Firing Circuits

Pyrotechnic systems often fall into a unique category in that inadvertent activation of these systems resulting from a fault and/or lack of safe margins can lead directly to loss of crew. For example, untimely activation of pyrotechnics used for a flight termination system could override an abort capability. Over the years, NASA and the military have learned lessons about safe pyrotechnic circuit design and test, many of which are codified. However, with NASA’s recent efforts to move toward a development model than leans more heavily on Commercial Partners these requirements have not always been directly levied on projects and in some cases been misinterpreted. This bulletin describes key safety features of pyrotechnic firing circuit design and provides rationale for inclusion of each feature.

Pyrotechnic Firing Curcuits↗

NASA NTRSDate not supplied

AATT Propulsion Technologies: Liner Physics Team Technical Challenge Roadmap

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Technical challenge↗

NASA NTRSDate not supplied

Service Provider Technical Interchange

ATM-X subproject, DIP (Digital Information Platform) is hosting a Service Provider(SP) workshop to discuss Service Quality, Data Governance, Cybersecurity, and Interoperability. This workshop will provide an interactive forum for exchanging ideas with peers and experts. Service Providers have a chance to influence future developments and ensure that your services align with DIP’s vision of the future aviation ecosystem.

Cybersecurity↗

NASA NTRS1961