Statistics – Applications
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jann.conf..285m&link_type=abstract
In JHU, The 1992 JANNAF Propulsion Meeting, Volume 1 p 285-294 (SEE N93-10001 01-20)
Statistics
Applications
Control Systems Design, Launch Vehicles, Liquid Propellant Rocket Engines, Pneumatic Control, Pneumatic Equipment, Servomechanisms, Thrust Vector Control, Titan Launch Vehicles, Actuators, Cost Reduction, Feedback Control, Hydraulic Control, Hydraulic Equipment, Life Cycle Costs, Transient Loads
Scientific paper
Recent studies performed for the Titan 4 launch vehicle indicate significant potential advantages in replacing the current stage 1 and 2 recirculating hydraulic TVC (thrust vector control) system with a PMA (pneumatic mechanical actuation) system. Some of the advantages of a PMA system over the recirculating hydraulic system include reduced part count and weight, reduced maintenance and life-cycle cost, and improved mission reliability. PMA technology, used in aircraft applications since the 1960s, is well suited in launch vehicle TVC applications where an existing pneumatic pressure source is available. A typical pneumatic motor TVC consists of a pneumatic power source, a dual rotor pneumatic motor, a gear box, a ball screw actuator, and the associated closed-loop servo-control elements. One key issue with implementing this mechanical approach is designing a TVC system to withstand large load transient disturbances during liquid engine starting. Hydraulic actuator transient loads have exceeded 60,000 lb(sub f) for a 30,000 lb(sub f) stall design actuator during ground starts of the Titan 3B, Stage 1 engine. A PMA TVC system must also withstand these start transients without imparting excessive reaction loads to the engine nozzle and thrust structure. Work completed to date with Martin Marietta to examine pneumatic motor powered TVC options and technology benefits is presented. The load transient issue is discussed along with potential solutions and the associated trades. General background on PMA technology and experience base is also presented.
Evans P. S.
Malone Mark C.
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