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The Mobile Servicing System
Mobile Servicing System
(MSS), is a robotic system on board the International Space Station
International Space Station
(ISS). Launched to the ISS in 2001, it plays a key role in station assembly and maintenance; it moves equipment and supplies around the station, supports astronauts working in space, and services instruments and other payloads attached to the ISS and is used for external maintenance. Astronauts receive specialized training to enable them to perform these functions with the various systems of the MSS. The MSS is composed of three components - the Space Station Remote Manipulator System (SSRMS), known as Canadarm2, the Mobile Remote Servicer Base System (MBS) and the Special
Special
Purpose Dexterous Manipulator (SPDM, also known as "Dextre" or "Canada hand"). The system can move along rails on the Integrated Truss Structure
Integrated Truss Structure
on top of the US provided Mobile Transporter cart which hosts the MRS Base System. The system's control software was written in the Ada 95 programming language.[1] The MSS was designed and manufactured by MDA Space Missions (previously called MD Robotics; previously called SPAR Aerospace) for the Canadian Space Agency's contribution to the International Space Station.

Contents

1 Canadarm2

1.1 Latching End Effectors

2 Special
Special
Purpose Dexterous Manipulator 3 Mobile Base System 4 Enhanced ISS Boom Assembly 5 Other ISS robotics 6 See also 7 References 8 Further reading 9 External links

Canadarm2[edit]

Astronaut Leroy Chiao
Leroy Chiao
works with the control of the Canadarm2 in the Destiny lab

The Canadian Government logo featured on the side of the Canadarm2.

Canadarm2 Latching End Effector

Canadarm2 captures Cygnus 7 in late 2016

Officially known as the Space Station Remote Manipulator System (SSRMS). Launched on STS-100
STS-100
in April 2001, this second generation arm is a larger, more advanced version of the Space Shuttle's original Canadarm. Canadarm2 is 17.6 m (58 ft) when fully extended and has seven motorized joints (an 'elbow' hinge in the middle, and three rotary joints at each of the 'wrist/shoulder' ends). It has a mass of 1,800 kg (4,000 lb) and a diameter of 35 cm (14 in). The arm is capable of handling large payloads of up to 116,000 kg (256,000 lb) and was able to assist with docking the space shuttle. It is self-relocatable and can move end-over-end to reach many parts of the Space Station in an inchworm-like movement. In this movement, it is limited only by the number of Power Data Grapple Fixtures (PDGFs) on the station. PDGFs located around the station provide power, data and video to the arm through either of its two Latching End Effectors (LEEs). The arm can also travel the entire length of the space station truss using the Mobile Base System. In addition to moving itself around the station, the arm can move any object with a grapple fixture. In construction of the station the arm was used to move large segments into place. It can also be used to capture unpiloted ships like the SpaceX
SpaceX
Dragon, the Cygnus spacecraft, and Japanese H-II Transfer Vehicle
H-II Transfer Vehicle
(HTV) which are equipped with a standard grapple fixture which the Canadarm2 uses to capture and dock the spacecraft. The arm is also used to undock and release the spacecraft after use. On-board operators see what they are doing by looking at the three Robotic Work Station (RWS) LCD screens. The MSS has two RWS units: one located in the Destiny module (US Lab module) and the other in the Cupola. Only one RWS controls the MSS at a time. The RWS has two sets of control joysticks: one Rotational Hand Controller (RHC) and one Translational Hand Controller (THC). In addition to this is the Display and Control Panel (DCP) and the Portable Computer System (PCS) laptop. In recent years, the majority of robotic operations are commanded remotely by flight controllers on the ground at Mission Control Center (NASA), or from the Canadian Space Agency. Operators can work in shifts to accomplish objectives with more flexibility than when done by on-board crew operators, albeit at a slower pace. Astronaut operators are used for time-critical operations such as visiting vehicle captures and robotics-supported extra-vehicular activity. Latching End Effectors[edit]

LEE drawing

Latching end effector (LEE)

Canadarm2 has two LEEs, one at each end. A LEE has 3 snare wires to catch the grapple fixture shaft.[2] Another LEE is on the Mobile Base System's Payload ORU Accommodations (POA) unit. The POA LEE is used to temporarily hold large ISS components. One more is on the Special Purpose Dexterous Manipulator (SPDM, also known as "Dextre" or "Canada hand"). Six LEEs have been manufactured and used in various locations on the ISS.

S/N Initial Location Current Location

201 LEE B POA LEE

202 LEE A ISS Interior, pending return to Earth

203 POA LEE LEE A

204 Spare stored on ELC1 LEE B

205 Earth, pending launch to ISS -

301 SPDM LEE SPDM LEE

Special
Special
Purpose Dexterous Manipulator[edit] Main article: Dextre The Special
Special
Purpose Dexterous Manipulator, or "Dextre", is a smaller two-armed robot that can attach to Canadarm2, the ISS or the Mobile Base System. The arms and its power tools are capable of handling the delicate assembly tasks and changing Orbital Replacement Units (ORUs) currently handled by astronauts during space walks. Although Canadarm2 can move around the station in an "inchworm motion", it's unable to carry anything with it unless Dextre
Dextre
is attached. Testing was done in the space simulation chambers of the Canadian Space Agency's David Florida Laboratory in Ottawa, Ontario. The manipulator was launched to the station 11 March 2008 on STS-123.

Dextre
Dextre
and Canadarm2 docked side by side on Power Data Grapple Fixtures

Mobile Base System[edit]

The Mobile Base System just before Canadarm2 installed it on the Mobile Transporter during STS-111

The Mobile Remote Servicer Base System (MBS) is a base platform for the robotic arms. It was added to the station during STS-111
STS-111
in June 2002. The platform rests atop the Mobile Transporter[3] (installed on STS-110, designed by Northrop Grumman in Carpinteria, CA), which allows it to glide 108 metres down rails on the station's main truss.[4] Canadarm2 can relocate by itself, but can't carry at the same time, Dextre
Dextre
can't relocate by itself. The MBS gives the two robotic arms the ability to travel to work sites all along the truss structure and to step off onto grapple fixtures along the way. When Canadarm2 and Dextre
Dextre
are attached to the MBS, they have a combined mass of 4,900 kg (10,800 lb).[5] Like Canadarm2 it was built by MD Robotics
MD Robotics
and it has a minimum service life of 15 years.[6][7] The MBS is equipped with 4 Power Data Grapple Fixtures, one at each of its four top corners. Any of these can be used as a base for the two robots, Canadarm2 and Dextre, as well as any of the payloads that might be held by them. The MBS also has 2 locations to attach payloads. The first is the Payload/Orbital Replacement Unit Accommodations (POA). This is a device that looks and functions much like the Latching End Effectors of Canadarm2. It can be used to park, power and command any payload with a grapple fixture, while keeping Canadarm2 free to do something else. The other attachment location is the MBS Common Attachment System (MCAS). This is another type of attachment system that is used to host scientific experiments.[6] The MBS also supports astronauts during extra-vehicular activities. It has locations to store tools and equipment, foot-restraints, handrails and safety tether attachment points as well as a camera assembly. If needed, it is even possible for an astronaut to "ride" the MBS while it moves at a top speed of about 1.5 meters per minute.[3] On either side of the MBS are the Crew and Equipment Translation Aids. These carts ride on the same rails as the MBS. Astronauts ride them manually during EVAs to transport equipment and to facilitate their movements around the station.

Canadarm2 riding the Mobile Base System along the Mobile Transporter railway, running the length of the station's main truss

Enhanced ISS Boom Assembly[edit] Main article: Orbiter Boom Sensor System
Orbiter Boom Sensor System
§ Enhanced ISS Boom Assembly Installed on May 27, 2011, is a 50-foot boom with handrails and inspection cameras, attached to the end of Canadarm2.

Shuttle Remote Manipulator System (RMS) holding OBSS boom on STS-114

Astronaut Scott Parazynski (at right) riding the OBSS boom to repair the solar array during STS-120

Other ISS robotics[edit] The station received a second robotic arm during STS-124, the Japanese Experiment Module Remote Manipulator System (JEM-RMS). The JEM-RMS will be primarily used to service the JEM Exposed Facility. An additional robotic arm, the European Robotic Arm
European Robotic Arm
(ERA) is scheduled to launch alongside the Russian-built Multipurpose Laboratory Module during 2017. Connected to Pirs, the ISS also has two Strela cargo cranes. One of the cranes can be extended to reach the end of Zarya. The other can extend to the opposite side and reach the end of Zvezda. The first crane was assembled in space during STS-96
STS-96
and STS-101. The second crane was launched alongside Pirs itself. See also[edit]

Robotics portal Spaceflight portal

MacDonald Dettwiler and Associates (MDA), the makers of Canadarm2 Canadarm, which was used on the Space Shuttle
Space Shuttle
Orbiters European Robotic Arm, a third robotic arm to be installed on the ISS The Remote Manipulator System, used on the ISS module Kibo Dextre, also known as the Special
Special
Purpose Dexterous Manipulator (SPDM), used on the ISS Strela, a crane used on the ISS to perform similar tasks as the Mobile Servicing System

References[edit]

^ "Case Study: MDA - Canadian Space Arm" (PDF). AdaCore. Retrieved 2009-10-15.  ^ EVA Checklist STS-126 Flight Supplement, 2008 pages 115, 117, 118 ^ a b "The Slowest and Fastest Train in the Universe". NASA.  ^ "Archived copy". Archived from the original on 2015-06-29. Retrieved 2015-06-26.  ^ Canadarm2 and the Mobile Servicing System ^ a b "CSA - STS-111
STS-111
- Mobile Base System - MBS Design". Canadian Space Agency. Retrieved 2008-03-15.  ^ "CSA - STS-111
STS-111
- Mobile Base System - Backgrounder". Canadian Space Agency. Retrieved 2008-03-15. [permanent dead link]

Further reading[edit]

Robotic Transfer and Interfaces for External ISS Payloads. 2014 good diagrams of SSRMS/Canadarm2

External links[edit]

Wikimedia Commons has media related to Mobile Servicing System.

ISS Assembly: Canadarm2 and the Mobile Servicing System Canadian Space Agency
Canadian Space Agency
information about Canadarm2 Youtube animation of the Mobile Base System, Canadarm2 and Dextre working together Youtube animation of Canadarm2 inchworming on the station

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