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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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This presentation provides information on battery passivation of spacecraft at the end of mission (EOM) life. The goal of battery passivation is to tackle the growing problem of orbital debris and its impact on space sustainability. NASA is increasingly using commercially produced buses in NASA missions, and this presentation provides information on EOM spacecraft passivation for NASA missions.
Coating procedure for tape separator of heat sterilizable battery
Performance testing of alkaline battery separator films
Miniature battery operated electromagnetic blood flowmeter for data acquisition from unrestrained animals
Silver zinc battery separator material development and production
Lightweight, rugged, inexpensive satellite battery for producing electrical power from ionosphere using electrodes with different contact potentials
Heat sterilizable remotely activated silver zinc battery for energy source of planetary lander capsule
Physical and chemical stability, transport properties, and battery performance in simplified cell design for alkaline silver battery separator materials
There has been significant progress towards the Go/No-Go Review Criteria for both sub-projects to prepare the project to enter Budget Period 2 in July.
A battery charger system includes a power supply and a switch connected to the power supply wherein the switch has a first switch half and a second switch half. First and second batteries are selectively connected to the power supply via the switch. The first and second switch halves are moved between a plurality of operational positions to fully charge the first battery, discharge the first battery into the second battery, discharge the second battery into the first battery, and fully charge the second battery.
The Hubble Telescope Battery Testbed employs the nickel-cadmium battery expert system (NICBES-2) which supports the evaluation of performances of Hubble Telescope spacecraft batteries and provides alarm diagnosis and action advice. NICBES-2 also provides a reasoning system along with a battery domain knowledge base to achieve this battery health management function. An effort to modify NICBES-2 to accommodate nickel-hydrogen battery environment in testbed is described.
The failure of a nickel cadmium battery undergoing tests is discussed. Reasons for the complete destruction of the battery while undergoing preparation for thermal vacuum testing are given.
Ethylene/acrylic acid separators for silver zinc battery applications
Cycling tests of alkaline battery separator membranes
Regression analysis of cycle life data for long life 20 ampere hour sealed nickel cadmium battery
A general discussion of the battery requirements for the Galileo probe is presented. Problems arising from mission changes are emphasized.
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Longitudinal vehicle motion control is essential for enhancing performance and optimizing a vehicle’s energy usage. However, it remains a challenging task due to the nonlinear and uncertain nature of vehicle dynamics, along with varying driving conditions. This paper presents a novel ultra-local optimal control approach based on Pontryagin’s Minimum Principle (PMP) that circumvents the need for detailed system identification by employing an ultra-local model. The control objective is to minimize the total energy consumption under boundary conditions while ensuring smooth traction force generation. The proposed approach is evaluated using a high-fidelity vehicle model in three representative scenarios: (i) nominal driving, (ii) a change in tire road friction coefficient (TRFC) from 0.5 to 0.65 and road slope from 0% to 5% during the maneuver, with target velocity unchanged, and (iii) a change in target velocity from 20 m/s to 0 m/s during the maneuver, while maintaining nominal TRFC and slope conditions. The simulation results demonstrate that the proposed method delivers robust performance, effectively balancing consumption and tracking accuracy in all tested scenarios.