Kinematic analysis and control strategy of 6-DOF hydraulic vibration table

Kinematic analysis and the new control structure of a 6-degree-of-freedom (DOF) hydraulic vibration table were presented to improve the control precision of the system. The vibration table structure was introduced and analyzed. The forward solution algorithm and the Jacobian matrix were developed to replace the DOF composition and decomposition matrices in conventional control method. The new control structure of 6 DOF hydraulic vibration table was presented based on kinematic analysis. Sine vibration tests were conducted in one hydraulic vibration table. The results show that the control strategy can markedly weaken the convected motion of the table under the condition of low frequency, big displacement vibrations, raise the degree of acceleration evenness and the transverse component indices, and improve the control precision of the table within the low-frequency band.