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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