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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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DOE OSTI2011

Analysis of ICRH antenna loading data in TEXTOR obtained during gas injection experiments

The possibility of increasing the coupling of ICRH power to plasmas on TEXTOR by gas injection was investigated, for a given voltage applied at the input of an antenna pair. The antenna pair was operated in the conjugated T mode, D(H) heating was used. Modeling of the antenna by transmission line theory shows that load resilience is maintained in a broad range of independent resistance variation for each strap. It is found that the absolute value of the reflection coefficient can be maintained below 0.2 for typical values of resistance measured in plasma shots (2-10 {Omega}/m) in good matching conditions. During gas injection, the loading resistance showed a clear increase with increasing line average electron density measured close to the plasma edge. Evidence of fast wave eigenmodes was also found, as characteristic resonant behavior of loading resistance and antenna self-inductance, due to poor absorption in the plasma caused by high H minority concentration.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗

DOE OSTI2024

Extreme Efficiency 240 Vac to Load Data Center Power Delivery Topologies and Control

The research explored innovative new circuit topologies and power converter architectures for data center power delivery, from the 240 V ac voltage at the input of a server rack, down to the less than 1 V dc power supply of the latest microprocessors. The research pursued three parallel tracks to increase the power conversion efficiency and to reduce the overall size of the servers: 1) An innovative new ac-dc power converter topology which enables improved efficiency through use of a novel direct step-down topology, well suited for the popular 48V dc power distribution. 2) A new series-stacked power delivery approach for servers comprising a large number of similar loads, such as hard drives in storage servers. The approach greatly reduces the power conversion losses, and achieves efficiency well over 99%. 3) A new family of hybrid switched-capacitor power converters that enable improved efficiency and reduced size through the use of dense ceramic capacitors and new circuit topologies that leverage GaN and low-voltage Si transistor technology. Together, the accomplished research achieved the goal of reducing the power conversion losses in datacenters, thereby reducing greenhouse gas emissions, operating costs, and overall electricity consumption.

24 POWER TRANSMISSION AND DISTRIBUTION↗

DOE OSTI2021

Recovering Power Factor Control Settings of Solar PV Inverters from Net Load Data.

Abstract not provided.

Talkington, Samuel↗

DOE OSTI2025

Load Data for Mk279 Projectiles

This document details the resulting velocity of Mk279 Mod1 projectiles when fired from a RD24 barrel with between 15 and 110 grains of smokeless propellant to achieve velocities between 163 and 651m/s.

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗

NASA NTRS1971

Deployment loads data from a free flight investigation of all-flexible parawings at small scale

Determining deployment characteristics of all-flexible parawings by free flight tests

Croom, D. R.↗

NASA NTRS1975

A 100-kW metal wind turbine blade basic data, loads and stress analysis

A rotor loads computer program was used to define the steady state and cyclic loads acting on 60 ft long metal blades designed for the ERDA/NASA 100 kW wind turbine. Blade load and stress analysis used to support the structural design are presented. For the loading conditions examined, the metal blades are structurally adequate for use, within the normal operating range, as part of the wind turbine system.

Cherritt, A. W.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur launch vehicle flights. Volume 2, part 1: Vibration power spectral density analysis of launch and max Q flight

Summary plots are presented for the time histories and power spectral density analyses of vibration and acceleration on the spacecraft from the Titan Centaur launchings carrying the Viking dynamic simulator and the two Viking spacecraft (TC-1, TC-3 and TC-4).

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur launch vehicle flights. Volume 2, part 2: Vibration power spectral density analysis of launch and max Q flight

Power spectral density plots and associated time history plots are presented for the Titan-Centaur launch carrying the Viking dynamic simulator.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur launch vehicle flights. Volume 2, part 3: Vibration power spectral density analysis of launch and max Q flight

Power spectral density plots and associated time history plots are presented for the Titan-Centaur launch carrying the Viking A spacecraft.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur launch vehicle flights. Volume 2, part 4: Vibration power spectral density analysis of launch and max Q flight

Power spectral density plots and associated time history plots are presented for the Titan-Centaur launch carrying the Viking B spacecraft.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur Launch Vehicle flights. Volume 3, part 1: Shock spectra of transients

Time histories and shock-spectra of vibration and acceleration were obtained during the TC-1, TC-4 and TC-3 launch and staging events. Summary plots are presented and comparisons to Viking Program midfrequency sine test requirements are made.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur Launch Vehicle flights. Volume 3, part 2: Shock spectra of transients

Shock spectra are presented for the TC-1 (Viking dynamic simulator) flight.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur Launch Vehicle flights. Volume 3, part 3: Shock spectra of transients

Shock spectra are presented for the TC-4 (Viking A Spacecraft) flight.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur launch vehicle flights. Volume 3, part 4: Shock spectra of transients

Shock spectra are presented for the TC-3 (Viking B Spacecraft) flight.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur Launch Vehicle flights. Volume 4, part 1: Titan Stage 1 and Centaur First Burn oscillations

Time history and PSD data are presented showing the character of the first longitudinal mode oscillation which occurred during the Centaur first burn of the TC-4 and TC-3 flights.

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur Launch Vehicle flights. Volume 4, part 2: Titan Stage 1 and Centaur First Burn oscillations

Power spectral density plots of vibration and strain data are presented for the Titan stage 1 burn and the Centaur main engine first burn of the TC-4 flight (Viking A spacecraft).

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur Launch Vehicle flights. Volume 4, part 3: Titan Stage 1 and Centaur First Burn oscillations

Power spectral density plots of vibration and strain data are presented for the Titan stage 1 burn and the Centaur main engine first burn of the TC-3 flight (Viking B spacecraft).

Kachadourian, G.↗

NASA NTRS1977

A compilation of spacecraft loads data from four Titan Centaur launch vehicle flights. Volume 5, part 1: Time history plots

Extended time history plots are presented for the TC-1, TC-3, and TC-4 flights. Vibration, strain, acceleration, force, and moment data are included.

Kachadourian, G.↗