Theoretical analysis on vibration transmission control in a shaft-hull system excited by propeller forces via an active multi-strut assembly

An active multi-strut assembly is used to attenuate vibration transmission from the shaft to the hull of underwater vehicles induced by the propeller forces. The active assembly with embedded actuators is inserted between the stern bearing and the hull. First, the dynamic model of the shaft-hull system is developed using the Timoshenko beam theory and the FRF (Frequency Response Function)-based synthesis method. Using the dynamic model, the characteristics of power flow through the active assembly are analyzed. Next, two control strategies that use three or six error transducers located evenly on the hull to measure vibrations are proposed and the feasibility of control is discussed. Finally, the performance of vibration suppression is analyzed and the two control strategies are compared. Numerical results have shown that the active assembly is able to suppress the transmission of lateral vibration induced by the propeller forces and accordingly reduce the hull vibration. Moreover, using six error transducers can lead to better control results in the low frequency range compared to using only three error transducers, but at the cost of stronger channel coupling and heavier computation burden.

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  • English

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  • Accession Number: 01765307
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 10 2021 3:17PM