Design and experimental evaluation of an electrohydraulic vibration shaker

The main objective of this paper is to experimentally evaluate of a low frequency vibration exciter featured open-loop hydraulic transmission which can produce a harmonic signal having frequency smaller than 5Hz through controlling the proportional valve. The first work is that the dynamic model of the system is built based on the basic principle of the hydraulic power. Due to the nonlinear dynamic characteristic and unknown system parameters, it is difficult to design a model-based controller. Hence, the next work is that an intelligent controller which is a combination between the sliding mode and fuzzy logic control algorithm is introduced. The proposed controller’s feature is that the fuzzy rules are designed according to the Lyapunov stable criterion and the chattering phenomenon from the conventional sliding mode control algorithm is removed. Then, the experimental apparatus is set up to evaluate the control performance of the shaker. The result confirmed that the control performance of the shaker tracks well the desirable trajectory.