Construction of multi-axis vibration control system for vibration reproduction in vehicles

The present paper describes the development of a three-axis vibration machine that precisely reproduces the vehicle´s acceleration characterized by multi-mode vibration. For reproduction along the vertical axis, a system identification experiment of the vibrator is first performed. Using the identified model, the feedforward control based on the pole-zero cancellation method is applied in order to realize the ideal transfer gain of one from the acceleration reference to its output. Next, in order to reproduce acceleration in the horizontal plane, a continuous-path tracking (CPT) control system is constructed using a precision XV stage. In the CPT control system, a disturbance observer, which focuses on accurate reproduction within a limited frequency, is introduced. Finally, the effectiveness of the proposed three-axis acceleration vibration reproduction system is verified experimentally using the developed DSP-controlled three-axis vibration machine.