Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Robotic refueling mission begins with space station robotics

08.03.2012
NASA's highly anticipated Robotic Refueling Mission (RRM) began operations on the International Space Station with the Canadian Dextre robot and RRM tools March 7-9, 2012, marking important milestones in satellite-servicing technology and the use of the space station robotic capabilities.

A joint effort between NASA and the Canadian Space Agency (CSA), RRM is an external station experiment designed to demonstrate the technologies, tools, and techniques needed to robotically service and refuel satellites in orbit, especially those not built with servicing in mind. RRM represents the first time the space station's Dextre robot is used for technology research and development, moving it beyond robotic maintenance of the orbiting superstructure.


During the RRM Gas Fittings removal task, mission operators direct Dextre to use the Wire Cutter Tool to cut a wire. Credit: (NASA/SSCO)

The RRM Gas Fittings Removal task represents the first use of RRM tools in orbit. During the task, robot operators at NASA's Johnson Space Center remotely control Dextre to retrieve RRM tools and go through the tasks required to remove representative fittings (located on the RRM module) used on many spacecraft for filling various fluids and gases prior to launch. Subsequent RRM operations include practicing robotic satellite refueling and servicing tasks using Dextre, RRM tools, and the satellite piece parts and interfaces contained within and covering the cube-shaped RRM module.

The International Space Station played a critical role in RRM development. "RRM showcases the best of what the International Space Station can offer as a test bed for state-of-the-art space technologies," says Frank Cepollina, veteran leader of five Hubble Space Telescope servicing missions and Associate Director of the Satellite Servicing Capabilities Office (SSCO) at NASA's Goddard Space Flight Center in Greenbelt, Md.

"The Hubble servicing missions taught us the importance and value of getting innovative, cutting-edge technologies to orbit quickly to deliver great results," continued Cepollina. "With the established infrastructure that the space station provides, our RRM team had support as we conceived, designed, built, and flew the RRM demo to space station in 18 months -- a timeline that many declared impossible."

The impact of the ISS as a useful technology test bed cannot be overstated, he said. "Fresh satellite-servicing technologies will be demonstrated in a real space environment within months instead of years. This is huge. This represents real progress in space technology advancement."

Launched to the space station in July 2011 aboard the last space shuttle mission (STS-135), RRM is the first in-orbit demonstration to test, prove and advance the technology needed to perform robotic servicing on spacecraft not designed for refueling and repair. RRM and Dextre will proceed through several tasks over about the next two years designed to demonstrate a wide array of servicing capabilities. RRM results are expected to reduce the risks associated with satellite servicing as well as lay the foundation and encourage future robotic servicing missions. Such future missions could include the repair and repositioning of orbiting satellites.

"The significance of RRM is that it demonstrates that robotic satellite-servicing technology exists now and it works correctly on orbit," says Benjamin Reed, Deputy Project Manager of SSCO.

The Canadian Space Agency is an essential partner in RRM operations. Dextre, the space station's twin-armed Canadian robotic "handyman," was developed by the CSA to perform delicate assembly and maintenance tasks on the station's exterior as an extension of its 57-foot-long (17.6 meter) robotic arm, Canadarm2. CSA wrote the software to control Dextre during RRM operations. Along with NASA Goddard and Johnson Space Center, CSA tested the software with flight-like tools and the RRM high-fidelity mockup in January-February 2012 at the MacDonald, Dettwiler and Associates Ltd. facility in Brampton, Canada. "The Canadian Space Agency has played a pivotal role in the development of space robotics, from the early days of the space shuttle to the work they are doing with Dextre on ISS," says Cepollina.

Included within the RRM module are four unique tools developed at Goddard: the Wire Cutter and Blanket Manipulation Tool, the Multifunction Tool, the Safety Cap Removal Tool, and the Nozzle Tool. Each tool is stowed in its own storage bay until Dextre retrieves it for use. Each tool contains two integral cameras with built-in LEDs to give mission controllers the ability to see and control the tools.

Viewers following along with the first phase of the Gas Fittings Removal task would see the following detailed activities. Mission operators will direct Dextre to remove three of the RRM tools from the module and perform functional checkouts prior to in-orbit operations. The RRM Multifunction tool will be used to release the "launch locks" that kept three tool adapters tightly secure during the shuttle flight of RRM to the space station. The next operation will entail Dextre using the Wire Cutter Tool to cut the lock wire that every spacecraft employs. This activity will show that even tiny lock wire, the thickness of four sheets of paper, can be isolated and cut using the latest robotic technologies, tools, and precision techniques.

The Gas Fittings Removal task follows on the heels of the 2011 RRM Launch Lock Removal and Vision tasks. On September 6-7, 2011, mission controllers used the Dextre robot to successfully release the locks that kept the four RRM Tools secure within the RRM module during the shuttle flight to the station. They also used Dextre's built-in hand camera to image the RRM hardware between sunlight and darkness, providing data that SSCO is using to develop machine vision algorithms that work collaboratively with the dynamic in-orbit lighting.

RRM operations are monitored and remote controlled by flight controllers at Goddard Space Flight Center, Johnson Space Center, Marshall Space Flight Center, and the Canadian Space Agency's control center in St. Hubert, Quebec.

Drawing upon 20 years of experience servicing the Hubble Space Telescope, SSCO initiated the development of RRM in 2009. RRM results to date will be presented at the Second International Workshop on On-Orbit Satellite Servicing, hosted and held at NASA's Goddard Space Flight Center May 30-31, 2012.

Satellite servicing with astronauts is not new for NASA. Skylab, NASA's first space station, was repaired in space in 1973. Solar Maximum and Syncom IV, with help from the shuttle, were successfully repaired in the 1980's. In the 1990's NASA serviced the Compton Gamma Ray Observatory, Intelsat 6 and executed a series of highly successful servicing missions to the Hubble Space Telescope.

More recently, human and robotic servicing capabilities have contributed to the assembly, upkeep, repair and maintenance of the space station. With RRM, NASA can begin the work of confirming specific robotic satellite-servicing technologies needed for the development of future robotic servicing spacecraft.

Dewayne Washington | EurekAlert!
Further information:
http://www.nasa.gov

More articles from Physics and Astronomy:

nachricht From rocks in Colorado, evidence of a 'chaotic solar system'
23.02.2017 | University of Wisconsin-Madison

nachricht Prediction: More gas-giants will be found orbiting Sun-like stars
22.02.2017 | Carnegie Institution for Science

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>