A new electro-hydraulic vibrator with rotary valve and the vibration wave influence caused by different structures of the rotary valve are presented. By establishing flow open area models of different valve cores, the models are analyzed using Matlab/simulink and structure characteristics are studied. Then, the relationship between the vibrator and the valve core is established, taking into account the effect of orifice pressure drop. Numerical analysis and experimental verification of waveform are carried out. The results show that the rectangular zero valve can obtain linear flow gain and the zero flow gain is comparatively big. In view of meeting higher flow, pressure and linear flow control requirements, windows in the sleeve and grooves in the spool can be designed to be rectangular with an according annular recess.
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