File:The Bell System technical journal (1922) (14569274069).jpg

Identifier: bellvol36systemtechni00amerrich (find matches)
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
Subjects: Telecommunication Electric engineering Communication Electronics Science Technology
Publisher: (Short Hills, N.J., etc., American Telephone and Telegraph Co.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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nd rapid response. Further investigation showedthat the development of a hydraulic servo employing an electrohy-draulic transducer appeared to provide a promising solution. A controlsystem of this type, therefore, has been developed for the NIKE missile. The design of the transducer, or control valve, was one of the principalproblems in the development of the missile control systems and is thesubject of this article. The specific design of the valve that will be dis-cussed here is knoAvn as Model J-7, and represents the state of thedevelopment in 1950. Valves of this type, with varying degrees of modifi-cation, are used in missiles of several other projects. APPLICATION Fig. 1 is a simplified schematic of the roll positioning system in theNIKE missile. It is the simplest of the three applications of the valve inthe missile, but will serve to illustrate the situation in which the valveoperates. The purpose of the roll servo is to keep the missile in a predict-able roll orientation. 711
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712 AX ELECTRICALLY OPERATED HYDRAULIC CONTROL VALVE 713 The roll systems reference is an Amount Gyro, which is a free-freegyro oriented on the ground prior to missile launch. The brush of a four-tap potentiometer (Item 2 in Fig. 1) is corniected to the outer gimbal andprovides a dc signal whose sign and magnitude indicate the roll positionwith respect to the stable e(iuilii)rium point. This signal is the principalinput to the servo amplifier that drives the valve. A roll-position error exists in the situation illustrated in Fig. 1. Thevalve is driven in the direction to cause the oil flow to rotate the ailerons,which in turn will roll the missile toward the null position. As the missilerolls, the winding of the roll-amount potentiometer rotates with it. Thebrush stays fixed in space with the gyro gimbal. The aerodynamic coupling between the aileron position and the mis-siles roll position is a complex and variable term in the feedback loopof the servo. The nature of the aerodynamic c

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