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- W772459647 abstract "The complex engine start and thrust control requirements of the Space Shuttle Main Engine (SSME) require unique valve, actuator and control system hardware. The Hydraulic Actuation System (HAS) was designed, developed, and now operates to meet tight engine control requirement limits to assure safe, reliable and correct engine thrust at all times. The actuator is designed to be fail safe and fail operate in the areas where redundancy is important. The HAS has an additional pneumatic operating capability that insures a safe sequential closure of all actuators and propellant valves in the event of the loss of hydraulic system pressure or loss of electrical closed loop control of the actuator. The objective of this paper is to provide a complete description of the actuator s internal operating system, along with its interaction with all SSME system interfaces. Additionally the paper addresses the challenges, problems identified, and corrected, and lessons learned, during the course of the almost 35 years of engine operation." @default.
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- W772459647 date "2010-05-04" @default.
- W772459647 modified "2023-09-27" @default.
- W772459647 title "Understanding the Space Shuttle Main Engine Hydraulic Actuation System and Reviewing Its Evolution" @default.
- W772459647 hasPublicationYear "2010" @default.
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