A technique for reducing the vibration and noise from marine propulsors is examined theoretically and demonstrated experimentally. A single layer of elastomer is incorporated into a rotor to form a rotating vibration isolation mount. The mount isolates the rotor hub and shaft from the unsteady forces generated on the blades due to their interaction with circumferentially non-uniform, time-averaged inflow and turbulence. This results in reduced vibration and noise. Nonrotating isolated rotor transmissibility is well predicted with a simple lumped parameter rotor model for frequencies below the first bending mode of the blades. Tests performed under operational (i.e., rotating) conditions have shown that rotor isolation provides a reduction of up to 15 dB in transmissibility compared to an identical rotor without isolation.
Rotor Isolation for Vibration and Noise Reduction
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received May 2002; Revised February 2003. Associate Editor: J. Wickert.
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Brungart, T. A., and Riggs, E. T. (June 18, 2003). "Rotor Isolation for Vibration and Noise Reduction." ASME. J. Vib. Acoust. July 2003; 125(3): 407–411. https://doi.org/10.1115/1.1569948
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