Accession Number:

ADA053030

Title:

Hydraulic Signal-Processing Amplifier Performance in Position Control Systems.

Descriptive Note:

Contractor rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1977-12-01

Pagination or Media Count:

43.0

Abstract:

Summing and proportional gain amplifiers for use in hydraulic closed-loop position control systems have been developed and their static and dynamic characteristics measured. Amplifiers constructed using a laminar flow laminate design with 0.5 mm nozzle width and an aspect ratio of 2.0 exhibited frequency responses with less than 3 dB decay and 90 deg phase shift at 300 Hz when operated at 110 kPa supply pressure. A closed-loop position control system for a load mass has been developed and tested using the summing and proportional gain amplifier, a position-to-fluid pressure feedback transducer, a hydraulic actuator, and a two-stage commercial servovalve modified to accept fluid inputs. Tests performed on the servosystem demonstrated a response to position step command, with no overshoot, in 38 ms. Analysis and test data show that the primary element limiting dynamic response is the fluidic input servovalve.

Subject Categories:

  • Fluidics and Fluerics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE