Thrust Vector Control by Electrical or Pneumatic Servoactuators,
GENERAL DYNAMICS SAN DIEGO CA CONVAIR DIV
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One of the chief objectives of this study was the establishment of the application range for electrical and pneumatic actuation systems. This was accomplished for a broad spectrum of operational requirements and environmental conditions. The maximum delivered torque is considered of primary significance in sizing the actuation system. Delivered torque is a function of deflection angle, axial thrust and chamber pressure. The weight of typical electrical and pneumatic systems is a function of delivered torque, deflection angle, slew rate, and operating time. Analysis of these weight trends indicates that the electrical system is lighter for longer operating times and is somewhat more sensitive to deflection rate. The pneumatic system, on the other hand, is very sensitive to operating time it is lighter for short operating time combined with moderate to high torque. Evaluation of the pneumatic system revealed that selection of operating pressure and gear ratio has a significant influence on system weight. Long operating times dictate the use of low operating pressure while short operating times favor the use of higher operating pressures. In general, both electrical and pneumatic TVC actuation systems are competitive where requirements for long term storage and operation in severe thermal environments prevent the use of the conventional hydraulic approach. The data presented in this study can be used to assist in system selection.
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