Accession Number:

AD0654364

Title:

A STUDY OF THE LOAD-FLOW CHARACTERISTICS OF AN ACCELERATION SWITCHING VALVE DRIVING A RESONANT LOAD,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1959-05-22

Pagination or Media Count:

47.0

Abstract:

A resonant loaded acceleration switching servo is examined both theoretically and experimentally to explain why the actuator amplitude at resonance is decreased as a function of the spool switching frequency. An explanation for this behavior is found in the inherent flow characteristics of the acceleration switching valve. The valve spool-load-flow characteristics follows the theoretical sharp edge orifice relationship non-load compensated for DC spool magnitude greater than the spool amplitude at switching frequency. For amplitudes less than that switching frequency, the DC flow characteristic is modified by a reverse flow characteristic due to switching motion. Since there is also a large pressure drop across the load at resonance, the flow to the actuator is reduced accordingly at resonance which in effect provides synthetic damping to the system. Author

Subject Categories:

  • Hydraulic and Pneumatic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE