Technical Paper
Modular Hydraulic Servos
1965-02-01
650336
Modular hydraulic servos can be described as those that include an individual hydraulic power source for each individual actuator. These are packaged in such a manner that the servo can be installed or removed readily by detaching a few bolts and an electrical connector. The resultant high density package retains all the advantages of the superior performance of a hydraulic servo and acquiries the simplicity, ease of maintenance and reliability of an all-electric servo. Modular hydraulic servos have been developed primarily for short duration missile control but have merit for continuous duty aircraft flight control. Since each modular servo has its own hydraulic supply, the designer is free of multi-channel cross-talk that has previously necessitated the use of a constant-pressure hydraulic system. Multi-pressure, multi-flow and other variations are now feasible. In addition to linear operation, bi-stable and tri-stable operation can be used to advantage.