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Monday, February 10, 2014

ORBITAL MANEUVERING SYSTEM


ORBITAL MANEUVERING SYSTEM

The orbital maneuvering system gives the push for the introduction for orbit, orbit circularization, orbit transfer, rendezvous, deorbit, abort to orbit and abort once around, and can provide up to 1,000 kilos of fuel system aft reaction control. This is in two separate sheaths which are on each side of the fuselage aft of the ship. In pods are also the back RCS and are referred to as the OMS/RCS pods. Each pod contains one OMS engine and the hardware needed to pressurize, store and distribute the propellants to perform the velocity maneuvers. The two pods provide much abundance for the OMS. Speed required for the vehicle which deals for orbital adjustments is approximately 2 feet per second for each nautical mile of altitude change.
PROPELLANT STORAGE AND DISTRIBUTION
The propellant storage and distribution system consists of one fuel tank and one oxidizer tank in each pod. Also has propellant feed lines, interconnect lines, isolation valves and crossfeed valves. the two fuel tanks of the OMS. Enable the orbiter to reach a 1,000-foot- per-second velocity change with a 65,000-pound payload in the payload bay.
The propeller is in domed cylindrical titanium tanks within each pod. Each propellant tank is 96.38 inches long with a diameter of 49.1 inches and a volume of 89.89 cubic feet unpressurized. The dry weight of each tank is 250 pounds. The propellant tanks are pressurized by the helium system. Preparing count four stub galleries and a collector manifold. The stub galleries acquire wall-bound propellant at OMS and in rcs speed operations not to introduce by mouth gases. The stub galleries have screens that allow propellant flow and prevent introduce gases by mouth. The collector manifold is connected to the stub galleries and also contains a gas arrestor screen to further prevent introduce by mouth gases also contains a gas arrestor screen to further prevent gas ingestion, which permits OMS engine ignition without the need of a propellant-settling maneuver using RCS thrusters. The operating pressure of each tank's nominal operating pressure is 250 psi, with a maximum operating pressure limit of 313 psia.
A capacitance gauging system in each OMS propellant tank measures the propellant in the tank. The system consists of a forward and aft probe and a totalizer. The forward and aft fuel probes use fuel (which is a conductor) as one plate of the capacitor and a glass tube that is metallized on the inside as the other. The front and back oxidizer probes use two concentric nickel tubes as the capacitor plates and oxidizer as the dielectric. (Helium is also a dielectric, but has a different dielectric constant than the oxidizer.) The back probes in each tank contain a resistive temperature-sensing element to correct variations in fluid density. The fluid in the area of the communication screens cannot be measured.
One tiny electric switch in each of the ac-motor-operated valve actuators signals the respective valves' position (open or closed) to the onboard flight crew displays and controls as well as telemetry. An extensive improvement program was implemented to reduce the probability of floating particulates in the tiny electric switch portion of each ac-motor-operated valve actuator. Particulates could affect the operation of the tiny electric switch in each valve and, thus, the position indication of the valves to the onboard displays and controls and telemetry.
CONCLUSION:
The job of the OMS is to propel and maneuver the shuttle after it has arrived in space. It consists of two smaller engines located at the rear of the orbiter on either side of the main engines.
WEB SITIES:
                        -Orbital Maneuvering System
                        -Propellant Storage and Distribution

                        -Wikipedia

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