Tests were conducted at temperatures from -40 F to +120 F on two simulated aircraft flight control hydraulic circuits. One of the circuits used an A-7 alieron flight control acutator designed for 3000 psi operating pressure with 3/8 and 1/4 inch diameter tubing. The other circuit used an actuator designed for 8000 psi operation with1/4 and 3/16 inch diameter tubing. Both actuators were designed for thesame frequency response, rate and thrust requirements. MIL-H-83282 fluid was used for all tests. Frequency response and zero load rate tests at varying temperatures on the two circuits established the minimum temperatures at which performance requirements were met. Time versus temperature data from A-7D Category II Tests was used in heat transfer calculations to provide a comparison of warm up times for aircraft systems using 3000 or 8000 psi. Results of all tests and analysis up time for systems operating at 3000 or 8000 psi.
Low temperature evaluation of advanced technology hydraulic system (8,000 psi)
Untersuchung eines weiterentwickelten Flughydraulik-Systems fuer niedrige Temperaturen (8000 psi)
US Government Reports ; Aug ; 1-37
1983
37 Seiten
Report
English
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