ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 6

The Design of a Control System for a Superimposed Frequency Fatigue Test Machine

Stoten, DP
Readers, University of Bristol, Bristol,

Smith, DJ
Readers, University of Bristol, Bristol,

(Received 16 July 1991; accepted 10 November 1992)

Abstract

The conjoint action of high- and low-frequency fatigue on a test specimen has been obtained using a servohydraulic test machine. A control strategy was implemented such that only one servo-actuator was required to obtain both low- and high-frequency components. This paper describes the test rig and the decoupled automatic controller development for it.

Test results show that the decoupled strategy systhesis produces satisfactory separation of the low- and high-frequency modes of the closed-loop response.

Keywords:
automatic control, separation of closed-loop modes of response, digital control of hydraulic machines, fatigue crack growth, major-minor cycling

Paper ID: JTE11764J
DOI: 10.1520/JTE11764J
ASTM International is a member of CrossRef.