Analysis of Hydraulic Servo Equations for WRDRF Prototype Control System: Volume I
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1971-10-01
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Abstract:A set of dynamic performance equations derived by Wylie Labs., Huntsville, Alabama, were independently rederived and checked. These equations describe the perfromance of the prototype electro hydraulic servo actuator system selected by Wylie as representative for the preliminary design for the Wheel/Rail Dynamic Research Facility to be installed at the High Speed Ground Test Center at Pueblo, colorado. Stability, frequency respose and various transient response test runs were made using the M-Delta computer program. Results from DOT/TSC computer runs correlate very closely with Wylie's results.Denominator Root Printout of DOT/TSC computer runs show that one case studied by Wylie had unstable roots even though closed loop frequency response appears stable. It is advised that complete analysis including roots printout and transient response always be included to supplement any closed loop frequency response analysis.
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