Simulation research on the dynamic characteristics of a novel electrohydraulic vibration exciter

The novel electrohydraulic vibration exciter consists of two-dimension servo control valve (abbr.2D valve) and double acting hydraulic cylinder. Vibration frequency and amplitude of electrohydraulic vibration exciters are controlled by the rotation and linear motion of the 2D valve spool respectively. The frequency of the 2D valve controlled vibration exciter is determined by the rotary speed and the number of grooves distributed on a spool land and coupled pattern of the grooves number on the spool land and the windows number on the spool sleeve. The hydraulic system of the electrohydraulic vibration exciter is linearized and analyzed based on linear theory in traditional research method. However, the non-linear factors often exist in the hydraulic system of the electrohydraulic vibration exciter, the true or comprehensive interpretation of the dynamic characteristics of the exciter cannot be got if these non-linear factors are neglected. Nonlinear modeling based on MATLAB software SIMULINK toolbox is used to study the 2D valve controlled electrohydraulic vibration exciter to get the dynamic characteristics, i.e. the output force and displacement of the actuator at different frequencies input. The comparison between simulation results and experimental results verifies the simulation analysis on electrohydraulic accuracy.