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ISS elements as of March 2009[update]
The components and the unfolding of the P3/P4 Truss in Detail (Animation)
The Integrated Truss Structure forms the backbone of the International Space Station, with mountings for unpressurized logistics carriers, radiators, solar arrays, and other equipment.
In the initial Space Station Freedom plans, a variety of designs for the truss were used, all of them intended to be shipped up as girders where they would be assembled and their equipment installed by astronauts on spacewalks once it had been launched. After the 1991 redesign, NASA switched to shorter, prefabricated pieces that were easier to install.
Truss components
Z1 truss
Z1 truss (above) and Unity Module (below) from STS-92 in October 2000
The first truss piece, the Z1 truss, launched aboard STS-92 in October 2000 was used as a temporary mounting position for the P6 truss and solar array until its relocation to the end of the P5 truss during STS-120. Though not a part of the main truss, the Z1 truss was the first permanent lattice-work structure for the ISS, very much like a girder, setting the stage for the future addition of the station's major trusses or backbones. It contains the control moment gyroscope (CMG) assemblies, electrical wiring, communications equipment, and two plasma contactors designed to neutralize the static electrical charge of the space station. It is unpressurized, but features two Common Berthing Mechanism docking ports for easy connecting and data communications. One port is used to connect the Z1 truss to the zenith port of Unity. The other port was used to temporarily store PMA-3. In October 2007, the P6 was moved to its permanent position next to P5, and the Z1 truss is now not used for connecting other elements, but solely to house the CMGs, communications equipment and the plasma contactors.
S0 truss
The S0 truss (above) from STS-110 April 17, 2002
The S0 truss, (also called the Center Integrated Truss Assembly Starboard 0 Truss) forms the center backbone of the Space Station. It was attached on the top of the Destiny Laboratory Module during STS-110 in April 2002. S0 is used to route power to the pressurized station modules and conduct heat away from the modules to the S1 and P1 Trusses. The S0 truss is not docked to the ISS, but is connected with four Module to Truss Structure (MTS) struts.
P1, S1 trusses
ISS S1 truss element being installed on STS-112 October 10, 2002
ISS P1 truss element being installed on STS-113 November 28, 2002
The P1 and S1 trusses (also called the Port and Starboard Side Thermal Radiator Trusses) are attached to the S0 truss, and contain carts to transport the Canadarm2 and astronauts to worksites along the space station. They each flow 290 kg (637 lb) of anhydrous ammonia through three heat rejection radiators. The S1 truss was launched on STS-112 in October 2002 and the P1 truss was launched on STS-113 in November 2002. Detailed design, test and construction of the S1 and P1 structures was conducted by McDonnell Douglas (now Boeing) in Huntington Beach, CA. First parts were cut for the structure in 1996, and delivery of the first truss occurred in 1999.
P2, S2 trusses
The P2 and S2 trusses were planned as locations for rocket thrusters in the original design for Space Station Freedom. Since the Russian parts of the ISS also provided that capability, the reboost capability of the Space Station Freedom design was no longer needed at that location. So P2 and S2 were canceled.
P3/P4, S3/S4 truss assemblies
The P3/P4 truss assembly being installed during STS-115 September 13, 2006. Astronauts give scale to the image.
The newly installed S3/S4 truss assembly during the first EVA of mission STS-117 on June 11, 2007.
The P3/P4 truss assembly was installed by the Space Shuttle Atlantis STS-115 mission, launched September 9, 2006, and attached to the P1 segment. The P3 and P4 segments a pair of solar arrays, a radiator and a rotary joint that will aim the solar arrays, and connects P3 to P4. Upon its installation, no power was flowing across the rotary joint, so the electricity generated by the P4 solar array wings was only being used on the P4 segment, and not the rest of the station. Then in December 2006 a major electrical rewiring of the station by STS-116 routed this power to the...(and so on) To get More information , you can visit some products about laser marking system, CCTV DVR System, . The 2.4G Long Distrance Wirelss Transmitter/Receiver System (BL-L2) products should be show more here!
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