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Record Details

Record 19 of 19006
Understanding the Space Shuttle Main Engine Hydraulic Actuation System and Reviewing Its Evolution
Author and Affiliation:
McWade, Robert J.(Pratt and Whitney Rocketdyne, Canoga Park, CA, United States)
Minor, Robert B.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
McNutt, Leslie M.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
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.
Publication Date: May 04, 2010
Document ID:
20100022059
(Acquired Jun 18, 2010)
Subject Category: SPACECRAFT PROPULSION AND POWER
Report/Patent Number: M10-0229
Document Type: Conference Paper
Meeting Information: 57th JANNAF Joint Propulsion Meeting; 3-7 May 2010; Colorado Springs, CO; United States
Meeting Sponsor: Department of the Army; Washington, DC, United States
Department of the Navy; Washington, DC, United States
NASA; Washington, DC, United States
Department of the Air Force; Washington, DC, United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACTUATORS; ENGINE CONTROL; PNEUMATICS; SPACE SHUTTLE MAIN ENGINE; THRUST CONTROL; PRESSURE REGULATORS; FEEDBACK CONTROL; VALVES; REDUNDANCY; PROPELLANTS; HYDRAULIC EQUIPMENT
Availability Source: Other Sources
Availability Notes: Abstract Only
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