Int. J. of Materials and Product Technology   »   1998 Vol.13, No.3/4/5/6

 

 

Title: The fuzzy control of an electrohydraulic fatigue testing system

 

Author: 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

 

Int. J. 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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