Electrohydraulic control systems have beenwidely used for material testing. But, because of the variety ofparameter and high-order parameter identification, the designof a suitable controller is not easy. In this paper, the fuzzy logiccontroller and linguistic approach self-organizing fuzzycontroller are implemented for fatigue position and forceteslings. Experiments have been carried out at between 0.1-10Hz. The results indicate that the fuzzy logic controller with afixed fuzzy rule is valid only for a narrow frequency range.The linguistic approach self-organising fuzzy controller has alearning mechanism to adjust the fuzzy rule. Thus it can beimplemented for a wider frequency range, and the peak-peakmagnitude errors of both position and force testings are within3for 0.1-10 Hz sinusoidal commands.
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