- API data.nasa.gov | Last Updated 2018-07-19T04:47:22.000Z
This data set contains CODMAC level 3 cometary, calibration, and instrument checkout data acquired by the Rosetta Orbiter ALICE UV Spectrometer during the first commissioning phase of the Rosetta mission, which occurred March 5, 2004 to June 6, 2004.
- API data.nasa.gov | Last Updated 2018-09-07T17:39:46.000Z
<p>Future astrophysics missions require efficient, low-temperature cryocoolers to cool advanced instruments or serve as the upper stage cooler for sub-Kelvin refrigerators. Potential astrophysics missions include Lynx, the Origin Space Telescope, and the Superconducting Gravity Gradiometer. Cooling loads for these missions are up to 300 mW at temperatures of 4 to 10 K, with additional loads at higher temperatures for other subsystems. Due to low jitter requirements, a cryocooler with very low vibration is needed for many missions. In addition, a multi-stage cooler, capable of providing refrigeration at more than one temperature simultaneously, can provide the greatest system efficiency with the lowest mass. Turbo-Brayton cryocoolers have space heritage and are ideal for these missions due to negligible vibration emittance and high efficiency at low temperatures. The primary limitation in implementing Brayton cryocoolers at temperatures below 10 K has been the development of high efficiency turbines. On the proposed program, Creare plans to leverage recent developments in gas bearing technology and low-temperature alternators to realize a high-efficiency, low-temperature turbine. On the Phase I project, we will perform a proof-of-concept demonstration of the turbine technology at temperatures down to 4 K. On the Phase II project, we will build and demonstrate an advanced low-temperature turbine at temperatures of 4 to 10 K.</p>
- API data.nasa.gov | Last Updated 2018-08-02T15:25:24.000Z
This grouping contains the incompressible-flow cases from the 1980-81 Data Library.
- API data.nasa.gov | Last Updated 2018-07-19T08:38:04.000Z
<p>We propose to enhance GSFC’s interplanetary mission design capability by designing a fully automated multi-spacecraft multi-objective interplanetary global trajectory optimization transcription. Advanced trajectory design technologies including the ability to design Distributed Spacecraft Missions (DSMs) are attracting increased interest but no mission design tool is currently capable of performing mission and systems design/optimization for an interplanetary DSM. This effort will deliver a software prototype capable of building the optimal design of a DSM-class mission where multiple spacecraft depart to the heliocentric regime from the same launch vehicle to perform coordinated science. This new capability will lay the groundwork for a follow-on proposal to implement this new capability into NASA Goddard's Evolutionary Mission Trajectory Generator (EMTG) where it will enable new announcements of opportunity for Distributed Spacecraft Missions.</p>
- API data.nasa.gov | Last Updated 2018-07-19T07:20:39.000Z
Assistive Free-Flyers (AFFs) are flying robots designed to share the living space with human astronauts in orbit. These robots have shown the potential to assist astronauts with tasks such as surveillance, inspection, and mapping. However, AFFs are currently designed without manipulation capabilities, and can thus be deployed mainly for sensing and observation. In this project, we aim to provide AFFs with the capability to physically interact with the environment through manipulation. We plan to equip AFFs with compact yet dexterous robotic arms and hands developed in this project, along with the planning and control methods needed to operate them. We aim to demonstrate new capabilities on tasks such as object acquisition and transport, part insertion and extraction, button or lever operation, docking and perching. We believe these abilities will greatly increase AFFs' reach, literally and figuratively.
- API data.nasa.gov | Last Updated 2018-07-19T07:55:56.000Z
Monitoring of structural strain is a well-established method for assessing the fatigue life and operational loads of aerospace vessels, aircraft, bridges, and other load-bearing structures. Information from extensive instrumentation using 100's to 1000's of strain gages can be fed into a condition based maintenance (CBM) algorithm to improve structural health assessments, detect damage, and lower maintenance costs. Current methods for measuring strain are too cumbersome, bulky, and costly to be practical for a large scale dense network of strain sensors. Furthermore, existing piezoelectric-based vibrational energy harvesters are built around general purpose components designed for operation in low-temperature application spaces. To realize pervasive structural health monitoring across a wide range of thermal and vibrational environments, a low cost, minimally intrusive, low maintenance, and reliable technology is needed. Cutting edge microelectromechanical systems (MEMS) sensors for measurements of strain, acceleration, pressure, acoustic emission, and temperature are becoming increasingly available for use in CBM and structural health monitoring (SHM). While these sensors offer a promising future for wireless sensing networks (WSN), implementation for CBM remains cumbersome due to the lack of versatile, cost-effective powering solutions. Wiring external power to sensors is an unattractive solution given the required installation overhead and associated maintenance costs. Battery powered solutions are unreliable and battery maintenance for a dense network of thousands of sensor nodes is not practical. For this STTR effort, Prime Photonics proposes to team with Virginia Tech to develop a multimode vibrational-thermal harvester with effective energy capture and efficient conversion.
- API data.nasa.gov | Last Updated 2018-09-05T23:06:09.000Z
Missions to Enceladus that want to determine the habitability of its icy ocean and search for extant life must acquire a pristine sample of the Enceladus ocean brine. The missions can either be accomplished via a lander or flythroughs of the plumes. From the mission and flight system design perspective, flythroughs incur less risk. Also, the planetary protection requirements are easier to meet. One of the key challenges for these missions is to avoid ambiguity of results that has plagued previous astrobiological efforts (e.g. Viking). Therefore, the system must collect a large enough sample to enable analysis by several independent techniques. In addition, the sample collection process must not alter or contaminate the sample, which can skew the analysis. The reliability of the collector after a long cruise time, its cleanliness and low mass are also key concerns. The goal of this proposal is to mature a sample collection mechanism to obtain a pristine sample of the ocean water via multiple flythroughs of the Enceladus icy plumes. The requirements for the sample collector include a large collector area to acquire the most sample while ensuring that it is efficiently transferred into a very small holding volume. It must preserve the sample in its pristine ice form until the instruments are ready to perform analysis and then efficiently transfer the sample to the downstream instruments. EFun is a square meter, <2kg funnel shaped collector that was designed as part of JHU/APL internal development, achieving TRL 3. As the icy particles enter the collector area, they are guided into a small holding volume. Once the ice is in the holder, EFun transforms the sample into liquid, prepares it by controlled dilution, and employs a syringe-like piston to distribute the sample to the instruments. A smaller version of the collector front end was prototyped and tested at NASA Ames vertical gun facility in vacuum and at temperature. These test have proven the integrity of the sample and characterized its collecting efficiency. Under ColdTech, we propose to prototype and test the holding volume of the collector and the sample preparation steps of melting, dilution, and transfer to downstream instruments. The goal is the development of a highly efficient and reliable system. This prototype will then be integrated with the large area collector and be tested as a complete system at Ames over the full range of expected plume environments. We will demonstrate end-to-end sample acquisition, liquefaction, and distribution. In addition, we would design a door mechanism to keep the collector area clean during the cruise. At the end of ColdTech, EFun would achieve TRL 5 and be ready to be proposed in upcoming missions.
Low Cost Automated Manufacture of High Efficiency THINS ZTJ PV Blanket Technology (P-NASA12-007), Phase Idata.nasa.gov | Last Updated 2018-07-19T09:38:25.000Z
NASA needs lower cost solar arrays with high performance for a variety of missions. While high efficiency, space-qualified solar cells are in themselves costly, > $250/Watt, there is considerable additional cost associated with the parts and labor needed to integrate the Photovoltaic Assembly. The standard approach has evolved with only minor changes, sacrificing cost because of risk aversion. Integration cost can be as much as double the bare cell cost – i.e. >$500/watt. Dramatic cost savings can be realized through manufacturing engineering of more efficient automated assembly processes. If the design of the Photovoltaic Assembly could be modified to be compatible with conventional and automatable electronic assembly and terrestrial solar panel assembly approaches, there could be considerable cost savings. There are many additional benefits with automation which include higher quality and consistency. This can reduce failures, increase production throughput, speed turnaround, and improve overall reliability. Cost and quality improvements can be realized on both thin and rigid arrays, increasing current capabilities, and enabling future high power missions. The benefits of automation are enhanced by the need for high power generation in support of energy intensive space missions. A 300kW array at $500/W would cost $150M just for the solar cell integrated array panels. A $150/W cell integration cost reduction would translate into savings of $45M, before considering the immediate and substantial benefits in consistency, reliability, and schedule. The Phase I effort demonstrates feasibility of a low cost array using an automated and integrated manufacturing approach, performed on an automation friendly solar cell, verified with environmental testing, and is used to predict array cost for a high power mission. Meeting these technical objectives will demonstrate reduced cost and justify a Phase II SBIR program preparing for a flight experiment.
- API data.nasa.gov | Last Updated 2018-07-19T07:02:30.000Z
The eight color asteroid survey provides reflection spectra for minor planets using eight filter passbands. This dataset includes the primary data obtained for 589 minor planets. The mean values for each minor planet included in the survey, the response curves for the filters, and the values determined for standard stars, are included in other related datasets. The wavelength range covered is from .33 to 1.04 micrometers.
- API data.nasa.gov | Last Updated 2018-07-19T08:48:46.000Z
<p>Frequent, short-term crew exposure to elevated CO2 levels combined with other physiological impacts of microgravity may lead to a number of detrimental effects, including loss of vision. This technology project seeks to develop a prototype of a real-time location system integrated with a CO2 sensor to monitor and correlate space-time-CO2 concentration with physical symptoms and functional evaluations of impairment. The CO2 sensor will be integrated with a low-power ultra-wideband (UWB) communication system with location-tracking capability. Although the initial development is oriented to the measurement of CO2, the system concept can easily be adapted to accommodate other types of sensors. <p/><p>Recent findings indicate that frequent, short-term crew exposure to elevated CO2 levels combined with other physiological impacts of microgravity may lead to a number of detrimental effects, including loss of vision. To evaluate the risks associated with transient elevated CO2 levels and design effective countermeasures, doctors must have access to frequent CO2 measurements in the immediate vicinity of individual crew members along with simultaneous measurements of their location in the space environment. To achieve this goal, a small, low-power, wearable system that integrates an accurate CO2 sensor with an ultra-wideband (UWB) radio capable of real-time location estimation and data communication is proposed. This system would be worn by crew members and would automatically gather and transmit sampled sensor data tagged with real-time, high-resolution location information. Under the current proposed effort, a breadboard prototype of such a system will be developed. Although the initial effort is targeted to CO2 monitoring, the concept is applicable to other types of sensors. For the initial effort, existing EV Modular Instrumentation System (MIS) Wireless Sensor Network (WSN) hardware will be leveraged to integrate a low-power CO2 sensor with a commercially available UWB radio system with ranging capability. In addition, potential for integration of this system with EV's Electronic-textile System for the Evaluation of Wearable Technology (E-SEWT) will be evaluated.</p>