Analysis of a typical nonlinear electrohydraulic servo-model establishes the dynamic-performance capabilities of servo-actuation systems

Zeller, J. R.

English

NASA Technical Reports Server

February 1970	 Brief 70-10152 
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NASA TECH BRIEF 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Performance-Limit Criteria for the Design 
of Fast-Response Servo-Actuation Systems 
The problem: 
Fast response (150 to 200 Hz) electrohydraulic 
valve-controlled piston servo-systems are used as 
research tools in experimental dynamics and controls 
studies. The components within these systems must 
operate at their limits of capability to achieve these 
high rates of response. Component linearities, often 
neglected in lower-response applications, must be 
considered in determining the dynamic-performance 
capabilities of these servo-actuation systems. 
The solution: 
An analysis of a typical nonlinear electrohydraulic 
servo-model has established performance-limit criteria 
for the design of fast-response servo-actuation systems. 
How it's done: 
A detailed nonlinear analytical model of these 
typical fast-response (150 to 200 Hz) servo-actuation 
systems has been formulated. The accuracy of the 
model has been verified by comparing model dynamic 
performance against actual experimental data for a 
specific application. Component performance evalua-
tions made possible with this nonlinear dynamic model 
have led to a new generalized limit criterion which in 
specific applications assists in the selection of system 
components. This criterion involves a nonlinear limita-
tion internal to the servo-valve device and, when com-
bined with existing limit criteria, will determine a 
maximum region of dynamic-performance capability 
for the fast-response systems.
Notes: 
1. The information contained in this Tech Brief may 
be of interest to designers of servo-actuation sys-
tems and to the electronics industry in general. 
2. The following documentation may be obtained 
from:
Clearinghouse for Federal Scientific 
and Technical Information 
Springfield, Virginia 22151 
Single document price $3.00 
(or microfiche $0.65) 
Reference: NASA-TN-D-5388 (N69-34652), 
Analysis of Dynamic Performance Limi-
tations of Fast Response (150 to 200 Hz) 
Electrohydraulic Servos. 
Technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B70-10152 
Patent status: 
No patent action is contemplated by NASA. 
Source: John R. Zeller 
Lewis Research Center 
(LEW-11022) 
Category 02 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Performance-limit criteria for the design of fast-response servo-actuation systems

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