A design-diversity based fault-tolerant COTS avionics bus network
This paper describes a COTS bus network architecture consisting of the IEEE 1394 and SpaceWire buses.
highly survivable avionics systems for long-term d↗
Engineering topics
Smith, J.
Publications and source records attributed to Smith, J..
The FAST (FRC Acceleration Space Thruster) Experiment
The Field Reverse Configuration (FRC) is a magnetized plasmoid that has been developed for use in magnetic confinement fusion. Several of its properties suggest that it may also be useful as a thruster for in-space propulsion. The FRC is a compact toroid that has only poloidal field, and is characterized by a high plasma beta = (P)/(B (sup 2) /2Mu0), the ratio of plasma pressure to magnetic field pressure, so that it makes efficient use of magnetic field to confine a plasma. In an FRC thruster, plasmoids would be repetitively formed and accelerated to high velocity; velocities of = 250 km/s (Isp = 25,000s) have already been achieved in fusion experiments. The FRC is inductively formed and accelerated, and so is not subject to the problem of electrode erosion. As the plasmoid may be accelerated over an extended length, it can in principle be made very efficient. And the achievable jet powers should be scalable to the MW range. A 10 kW thruster experiment - FAST (FRC Acceleration Space Thruster) has just started at the Marshall Space Flight Center. The design of FAST and the status of construction and operation will be presented.
Martin, Adam↗
Space VLBI Mission Operational Support at the NASA Deep Space Network
The first Space Very Long Baseline Interferometry (VLBI) mission VSOP has been successfully operated since 1997 and several follow-on missions are in development or under discussion.
DSN space VLBI VSOP mission operations↗
A Decision Support System for Managing a Diverse Portfolio of Technology Resources
This paper describes an automated decision support system designed to facilitate the management of a continuously changing portfolio of technologies as new technologies are deployed and older technologies are decommissioned.
decision support equipment resource allocation↗
Low-Cost MEMs Robotics for Space Exploration: A Probabilistic Trade Space for Biomorphic Exploration Devices
During the next decade, numerous in-situ sampling missions are planned to a variety of planets, moons, asteroids, and comets.
In-situ sampling robotics MEMs Biomorphic↗
Spacecraft Onboard Interface Standardization in CCSDS
Explore the source record for details and available documents.
communications standards network standards↗
Active Polymers as Artificial Muscles - Capabilities, Potentials and Challenges
Explore the source record for details and available documents.
Electroactive Polymers planetary applications arti↗
Challenges to the Application of IPMC as Actuators of Planetary Mechanisms
Ion-exchange polymer membrane metallic composites (IPMC) are one of the electroactive polymers (EAP) that were shown to have potential application as actuators.
Electroactive↗
Long-Term Cyclic Oxidation Behavior of Uncoated and Coated Re-108 and In-939 at 980 and 870 C
Very long-term cyclic oxidation behavior of Re108 and In939 with and without a protective coating was evaluated at 980 and 870 C, respectively. Re-108 and In-939 without a protective coating began to show a rapid weight loss at 3000 h due to scale spallation, indicating the need for an oxidation protective coating for longer than thousands of hours of oxidative life. NiAl-base coatings of a vapor phase aluminide (VPA), a pack aluminide (CODEP), and a slurry paint aluminide (SERMALOY J) were applied on Re-108 and In-939. The VPA and CODEP on Re-108 and all three coatings on In-939 showed excellent cyclic oxidation resistance out to 10,000 h. Coated alloys were annealed in an inert atmosphere to determine the loss of Al from the coating into the alloy substrate through diffusion. The Al loss from the coating through diffusion was twice as great as the Al loss through oxidation after 10,000 h of cyclic exposure. The oxidation life of VPA-coated Re-108 was estimated by calculating the amount of Al initially available for protective oxidation and the amount of Al lost through oxidation and diffusion.
Lee, K. N.↗
Challenges to the Transition of IPMC Artificial Muscle Actuators to Practical Application
Ion-exchange membrane metallic composites (IPMC), which were the first reported in 1992, are one of the electroactive materials (EAP) with potential applications as artificial muscle actuators.
Haptic↗
Challenges to the Transition of IPMC Artificial Muscle Actuators to Practical Application
In recent years, electroactive polymers (EAP) materials have gained recognition as potential actuators with unique capabilities having the closest performance resemblance to biological muscles.
haptic↗
A Report on the Applications for a Spacecraft Avionics Functional Model
Explore the source record for details and available documents.
resource estimates↗
Novel Missions for Next Generation Microsatellites: The Results of a Joint AFRL-JPL Study
The development of technologues for miniature, low-mass, high density components and of systems that efficiently utilize these technologies has enabled a path to the next generation of highly capable microsatellites in the range of 10 - 100-kg.
remote↗
Navigation Strategy for the Mars 2001 Lander Mission
The MSP 2001 project will send an orbiter, a lander, and a rover to Mars in the 2001 opportunity. The lander will demonstrate precision landing at Mars by utilizing improved approach navigation and hypersonic aeromaneuvering.
Navigation↗
Mars Orbit Rendezvous Strategy for the Mars 2003/2005 Sample Return Mission
The baseline scenario for the Mars 2003/2005 Sample Return Mission utilizes Mars orbit rendezvous to retrieve two orbiting sample canisters containing Martian surface material.
Mars↗
Mars Orbit Rendezvous Strategy for the Mars 2003/2005 Sample Return Mission
The primary objective of the Mars 2003/2005 Sample Return Project is to return Martian surface materials to Earth from two different sites by the year 2008.
Rendezvous↗