Difference between revisions of "Space Transportation System (STS)"

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The '''Space Transportation System (STS)''', also known as space shuttle, was developed by [[NASA]] as a means to move both men and material into [[low earth orbit]].
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At launch the space shuttle is attached to an ET (external tank) an two SRB (solid rocket booster).
 
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The SRB jettison at 126 seconds in-flight and fall back down to earth where they will picked up and refurbished for another launch.
 
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The ET will not be reused.
 
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=Orbiter=
 
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[[Image:STSOrbiter 2 25.png|right|thumb|200px|Cross section of a STS orbiter, highlighting tanks and hydraulic systems]]
 
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The STS Orbiter is the primary component of the STS and the only part of the STS stack, which reaches orbit. It is a mixture between spacecraft and aircraft, landing as a glider after a long lifting reentry.
 
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==Orbital Maneuvering System (OMS)==
 
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[[Image:OMS_pod_diag.png|right|thumb|200px|Diagram of an OMS pod]]
 
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[[Image:OMS engine diag.png|right|thumb|200px|Diagram of an OMS engine]]
 
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[[Image:OMS_diag.png|right|thumb|200px|Diagram of the OMS plumbing]]
 
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The OMS provides propulsion for the orbiter during the orbit phase of flight. The OMS is used for orbit insertion, orbit circularization, orbit transfer, rendezvous, and deorbit. The OMS may be used to provide thrust above 70,000 feet altitude. Each OMS pod can provide more than 1,000 pounds of propellant to the RCS. Amounts available for interconnect depend on loading and number of OMS starts during the mission.
 
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The OMS is housed in two independent pods on each side of the orbiter’s aft fuselage. The pods,
 
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which also house the aft reaction control system (RCS), are referred to as the OMS/RCS pods.
 
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Each pod contains one OMS engine and the hardware needed to pressurize, store, and
 
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distribute the propellants to perform OMS engine burns. Normally, OMS maneuvers are
 
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done using both OMS engines together; however, a burn can be performed using only
 
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one of the OMS engines. For velocity changes less than 6 fps (2 m/s), RCS is used. For velocity
 
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changes greater than 6 fps, a single OMS engine burn is preferred, because engine lifetime
 
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concerns make it desirable to minimize engine starts. Two OMS engines are used for large
 
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velocity changes, or for critical burns. Propellant from one pod can be fed to the
 
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engine in the other pod through crossfeed lines that connect the left and right OMS pods.
 
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The OMS has important interfaces with the data processing system and the electrical power
 
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system. The OMS valves and gimbal actuators receive commands, and the system returns some
 
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data to the general purpose computers through multiplexer/demultiplexer units. Electrical
 
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power is supplied to the OMS through main buses, control buses, and alternating current
 
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buses for the operation of switches, valves, instrumentation, gimbal actuators, and heaters.
 
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The OMS/RCS pods are designed to be reused for up to 100 missions with only minor repair,
 
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refurbishment, and maintenance. The pods are removable to facilitate orbiter turnaround,
 
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if required.
 
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===Engines===
 
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The OMS engines are designated left and right, descriptive of location. The engines are located in gimbal mounts that allow the engine to pivot left and right and up and down under the control of two electromechanical actuators. This gimbal system provides for vehicle steering during OMS burns by controlling the direction of the engine thrust in pitch and yaw (thrust vector control) in response to commands from the digital autopilot or from the manual controls.
 
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The OMS engines can be used singularly by directing the thrust vector through the orbiter center of gravity or together by directing the thrust vector of both engines parallel to the X axis. During a two-OMS-engine burn, the RCS will come into operation only if the attitude or
 
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attitude rate limits are exceeded. However, during a one-OMS-engine burn, RCS roll control is required.
 
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Each of the two OMS engines produces 6,000 pounds of thrust (26.7 kN). For a typical orbiter weight, both engines together create an acceleration of approximately 2 ft/sec<sup>2</sup> or 0.06 g’s. Using up a fully loaded tank, the OMS can provide a total velocity change of approximately 1,000 ft/sec (304.8 m/s). Orbital insertion burns and deorbit burns each typically require a velocity change of about 100–500 ft/sec. The velocity change required for orbital adjustment is approximately 2 ft/sec (0.61 m/s) for each nautical mile of altitude change. Each OMS engine is capable of 1,000 starts and 15 hours of cumulative firing. The minimum duration of an OMS engine firing is 2 seconds.
 
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The OMS engines use monomethyl hydrazine as the fuel and nitrogen tetroxide as the oxidizer.
 
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These propellants are hypergolic, which means that they ignite when they come in contact with
 
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each other; therefore, no ignition device is needed. Both propellants remain liquid at the
 
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temperatures normally experienced during a mission, however, electrical heaters are located
 
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throughout the OMS pods to prevent any freezing of propellants during long periods in
 
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orbit when the system is not in use.
 
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Each OMS engine has a gaseous nitrogen tank that provides pressurized nitrogen to operate the engine valves. The OMS engine does not have propellant pumps; propellant flow to the
 
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engines is maintained by pressurizing the propellant tanks with helium.
 
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In the OMS engine, fuel is burned with oxidizer to produce thrust. The major elements of the
 
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OMS engine are the bipropellant valve assembly, the injector plate, the thrust chamber, and the nozzle.
 
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The [[Propellant|propellants]] ignite on contact, so theoretically the OMS engines could get ignited as often as desired, but the number of restarts gets limited by the supply of N<sub>2</sub> used for operating the valves and purging the fuel lines of the engines, which is only enough for ten restarts.
 
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==Differences between the orbiters==
 
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===Columbia===
 
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Columbia(OV-102) was the first space-rated orbiter and was always the heaviest of the fleet. She was always the unique one with her SILTS(Shuttle Infrared Lee-side Temperature Sensing) pod on her vertical tail and the black wing chines. She was the only orbiter that never flew an ISS or Mir mission due to her mass.
 
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However, her next mission following STS-107 was STS-118 which was going to ISS to deliver and install the S5 truss segment.
 
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She was also capable of 16-day Extended Duration Orbiter(EDO) missions thanks the EDO cryokit in her payload bay.
 
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===Challenger===
 
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Challenger(OV-099) started out as Structural Test Article-099(STA-099) but when NASA decided against modifying Enterprise(OV-101) they decided to upgrade STA-099 into a spaceflight capable condition. During this refurbishment process she was known as OV-101M for a short while until she was later redesignated OV-099 keeping her STA number.
 
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She was also a bit lighter than Columbia allowing her to perform IUS(Inertial Upper Stage) missions.
 
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Challenger had been modified at KSC to be able to support the Centaur G/G Prime upperstages, but she was destroyed during the launch of STS-51L prior to carrying any Centaur upperstages.
 
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===Discovery===
 
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Discovery(OV-103) was originally slated to become the "Air Force orbiter" stationed at Vandenberg AFB flying polar-orbit missions from Space Launch Complex-6(SLC-6, pronounced "slick six" ). However, the Challenger accident happened prior to the first Vandenberg AFB flight and the Air Force withdrew from the Shuttle program. She was then selected to fly the Return To Flight mission, STS-26R carrying TDRS-C.
 
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Discovery also carried significant payloads such as the Ulysses Solar Polar Mission spacecraft and the Hubble Space Telescope.
 
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After Columbia, it looked for a while that Atlantis would fly STS-114, the Return To Flight mission. However, when engineers found problems with the actuators in the Rudder/Speedbrakes of the fleet, Discovery was selected once again to return the fleet to flight
 
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Again, after the grounding of fleet following STS-114, Discovery was selected to fly STS-121, in order to eliminate the need of performing back-to-back flights with Atlantis(STS-121 and STS-115).
 
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Her next mission is STS-122/1E, carrying the Columbus Orbital Facility module to ISS.
 
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She will during the most part of 2007 receive a new modification called Station To Shuttle Power Transfer System(SSPTS) which will allow her to remain docked longer to ISS.
 
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===Atlantis===
 
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Atlantis(OV-104) is pretty similar to Discovery, not much difference in mass or exterior appearance. Atlantis was used to launch Galileo to Jupiter and Magellan to Venus. Atlantis was the first orbiter to ever dock with Mir on STS-71 in July 1995.
 
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===Endeavour===
 
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Endeavour(OV-105) was built as replacement for Challenger utilising spare parts NASA opted to build along with Discovery and Atlantis. Endeavour was the first orbiter delivered with an EDO capability and a 40 ft diameter drag chute used after touchdown to brake the orbiter on the runway.
 
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Endeavour will be the first orbiter to fly with the SSPTS mod that has been installed during 2006.
 
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=STS addons for Orbiter=
 
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*[[Shuttle Fleet]], a collection of the whole vehicle fleet, by David413 and Don 'Donamy' Gallager.
 
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*Slats Pad 39 and Edwards addons
 
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*The STS payloads project.
 
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*The high-detail ETs by David Sundstrom
 
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*[[Space Shuttle Ultra]], which is the successor of the [[Space Shuttle Deluxe]] project.
 
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=References=
 
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* [http://www.jsc.nasa.gov/news/columbia/fr_generic.pdf Space Shuttle Operational Flight Rules - All Flights] (5.3 MB PDF)
 
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* [http://www.shuttlepresskit.com/STS-88/scom.htm STS orbiter subsystem manual]
 
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* [http://www.jsc.nasa.gov/history/shuttle_pk/shuttle_press.htm Shuttle press kits from JSC]
 
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* [http://www.shuttlepresskit.com/ shuttle press kits]
 
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==GNC==
 
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* [http://www.research.ibm.com/journal/rd/201/ibmrd2001K.pdf Real-Time Orbiter Abort Guidance], V. S. Sohoni, IBM
 
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* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900001613_1990001613.pdf Analysis of the Ascent Thrust Vector Control System], Independent Orbiter Assessment following STS-51L
 
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* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740004402_1974004402.pdf Unified Powered Flight Guidance Algorithm(C-4108)], Space Shuttle G&N Equation Document No. 24 (Revision I), Brand, Brown, Higgins, Draper Laboratory, April 1974.
 
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==DPS==
 
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* [http://www.avionic-online.com/download/DPSj4.pdf DPS Dictionary] - contains the descriptions and specifications of the CRT displays.
 
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==RSRM ballistic mass properties reports==
 
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These are the performance reports prepared by Thiokol, regarding the actual performance of the RSRM motors after each flight.
 
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* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900016748_1990016748.pdf RSRM-9 (360L009): Ballistics mass properties]
 
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* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19910010890_1991010890.pdf RSRM-11 (36OW011) ballistics mass properties (STS-35)]
 
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* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19910007826_1991007826.pdf RSRM-13 (360Q013) ballistics mass properties flight designation STS-41]
 
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==For specific missions==
 
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===STS-118===
 
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* [http://www.boeing.com/defense-space/space/hsfe_shuttle/missions/sts118/STS-118%20Spaceflight%20Notepad.pdf STS-118 Reporter's Spaceflight Notepad] (5.2 MB pdf)
 
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===STS-122===
 
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* [http://www.boeing.com/defense-space/space/hsfe_shuttle/missions/sts122/STS-122%20Spaceflight%20Notepad.pdf STS-122 Reporter's Spaceflight Notepad] (5.2 MB pdf) Summary for journalists by Boeing Communications, includes very well-done descriptions of the flight rules.
 
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=See also=
 
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*[[STS FAQ]]
 
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*[http://en.wikipedia.org/wiki/Space_Shuttle Wikipedia article about the STS] 
 
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[[Category:Historic spacecraft|Space]]
 
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[[Category:Launch vehicles|Space]]
 
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[[Category:Spaceplanes]]
 

Revision as of 13:02, 25 July 2008

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