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The present work introduces an engineering approach to investigate the coupled fluid-structure interactions for high-frequency and small displacement problems. A new sequential coupling method is developed to investigate the fluid-structure interactions in high-frequency and small displacement systems. The new method is based on the idea that the structure immersed in the fluid vibrates due to the flow force, and in turn the vibrating structure also imposes a reaction power to the surrounding flow. The reaction power is interpreted by a boundary vibrating velocity. The new developed fluid-structure coupling approach is applied to a model disk drive and the results indicate that the dominant coupling effect is induced by the first frequency boundary vibration in out-of-plane direction. Without consideration of coupling effects, the arm vibration amplitude is overestimated in the out-of-plane direction, and underestimated in the in-plane direction. The turbulent flow behavior and the characteristics around vibrating boundary are revealed under the influence of the coupling approach. The simulation results are examined and verified by LDV measurements, which confirm that the newly developed approach is feasible for predicting the vibration amplitude of immersed vibration boundaries.