In order to achieve highly realistic vibration qualification tests, a lot of attention is recently paid to so-called multiple-input-multiple-output (MIMO) vibration control. Instead of subjecting the test article sequentially to uni-axial (single-shaker) vibrations, it is now possible to reproduce a multi-axial vibration environment using dedicated hardware and digital control software. This paper presents a generic MIMO random control strategy and presents some unique control experiments obtained on a six degrees-of-freedom (DOF) hydraulic shaking system. Despite the non-linearity of the shaking system, the targeted multi-axial vibration environment could bereproduced.
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