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Aerospace - Direct Drive Servovalves
- Aerospace Standard
- ARP4493A
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Aerospace Recommended Practice (ARP) is intended as a guide to aid in the specification and testing of Direct Drive Servovalves, but does not include the associated electronic controller.
The recommendations contained in this ARP are primarily confined to the input and output characteristics of Direct Drive Servovalves (DDV). The only exception to this approach involves the definition and specification of chip shear force, which is not typically measurable by nondestructive external testing. The information presented should be useful in standardizing the terminology, the specification of physical and performance parameters, and the test procedures used in conjunction with these components.
Direct drive servovalves are of two basic types: open loop and closed loop. In the case of open loop direct drive servovalves, the significant input is the motor current as is the case with electrohydraulic servovalves covered in ARP490. A closed loop direct drive servovalve includes a means of position feedback and relies on an electronic controller to control its performance characteristics. Because of the importance of the closed loop category of DDVs, many specifications will be written for the closed loop performance. To generalize this document, the system input signal has been referred to as the "command" and applies equally well to open loop valves, in which the command will usually be expressed in amps, and to closed loop valves which usually receive commands as an input voltage to the valve controller. Many provisions of this document apply equally to larger tandem Main Control Valve (MCV) type DDVs as well as standard size single hydraulic system valves.
The specifications contained herein should be used to describe direct drive flow control servovalves. Additional specifications may be necessary to define special requirements for specific control systems. Also, specialized test procedures may be necessary to measure DDV performance in these unusual specification areas. These considerations are beyond the scope of this recommended practice.
Rationale
Revision A to ARP4493 is being made for the following reasons:
-
a
The technical information and the references called out in the document have been updated.
-
b
Editorial changes have been made, where appropriate, to improve the readability of the document.
Recommended Content
| Aerospace Standard | Electrohydraulic Servovalves |
| Technical Paper | Electrochemical Primary Flight Control Activation Systems for Fighter/Attack Aircraft |
| Aerospace Standard | Aerospace - Design and Installation of Commercial Transport Aircraft Hydraulic Systems |
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Issuing Committee
A-6B1 Hydraulic Servo Actuation Committee
The Hydraulic Servo Actuation Panel is the panel promoting the advancement of hydraulic servo actuation and control in sciences, technologies, engineering practices, and standards associated with the design, manufacture, operation, and support of aerospace vehicles as follows. The panel develops standards, processes, and practices related to hydraulic servo actuation and control systems for Commercial and Military air vehicles. The scope of these efforts will cover primary, secondary, and utility actuation employed on current and future manned and unmanned aircraft, spacecraft, and missiles.
Reference
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