Title: The fuzzy control of an electrohydraulic fatigue testing system

Authors: Y.T. Wang, C.C. Chang

Addresses: Department of Mechanical Engineering, National Taiwan Institute of Technology, 43 Keelung Road, Section 4, Taipei, Taiwan, Republic of China. ' Department of Mechanical Engineering, National Taiwan Institute of Technology, 43 Keelung Road, Section 4, Taipei, Taiwan, Republic of China

Abstract: Electrohydraulic control systems have been widely used for material testing. But, because of the variety of parameter and high-order parameter identification, the design of a suitable controller is not easy. In this paper, the fuzzy logic controller and linguistic approach self-organising fuzzy controller are implemented for fatigue position and force testings. Experiments have been carried out at between 0.1-10 Hz. The results indicate that the fuzzy logic controller with a fixed fuzzy rule is valid only for a narrow frequency range. The linguistic approach self-organising fuzzy controller has a learning mechanism to adjust the fuzzy rule. Thus it can be implemented for a wider frequency range, and the peak-peak magnitude errors of both position and force testings are within 3% for 0.1-10 Hz sinusoidal commands.

Keywords: electrohydraulic control; fuzzy logic; fuzzy control; LASOC; self-organising control; fatigue testing; force testing.

DOI: 10.1504/IJMPT.1998.036236

International Journal of Materials and Product Technology, 1998 Vol.13 No.3/4/5/6, pp.184 - 194

Available online: 01 Nov 2010

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