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Research Papers

Active Control of Sound Radiated by a Submarine Hull in Axisymmetric Vibration Using Inertial Actuators

[+] Author and Article Information
Mauro Caresta

School of Mechanical and Manufacturing Engineering,  The University of New South Wales, Sydney NSW 2052, Australiamcaresta@yahoo.it

Nicole Kessissoglou

School of Mechanical and Manufacturing Engineering,  The University of New South Wales, Sydney NSW 2052, Australia

J. Vib. Acoust 134(1), 011002 (Dec 22, 2011) (8 pages) doi:10.1115/1.4004673 History: Received October 13, 2010; Revised May 23, 2011; Published December 22, 2011; Online December 22, 2011

This paper investigates the use of inertial actuators to reduce the sound radiated by a submarine hull under excitation from the propeller. The axial forces from the propeller are tonal at the blade passing frequency. The hull is modeled as a fluid-loaded cylindrical shell with ring stiffeners and equally spaced bulkheads. The cylinder is closed at each end by circular plates and conical end caps. The forces from the propeller are transmitted to the hull by a rigid foundation connected to the propeller shaft. Inertial actuators are used as the structural control inputs. The actuators are arranged in circumferential arrays and attached to the internal end plates of the hull. Two active control techniques corresponding to active vibration control and discrete structural acoustic sensing are implemented to attenuate the structural and acoustic responses of the submarine. In the latter technique, error information on the radiated sound fields is provided by a discrete structural acoustic sensor. An acoustic transfer function is defined to estimate the far field sound pressure from a single point measurement on the hull. The inertial actuators are shown to provide control forces with a magnitude large enough to reduce the sound due to hull vibration.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of a simplified physical model of a submarine hull and its propulsion system

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Figure 2

Displacements and coordinate system of the coupled conical-cylindrical shell

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Figure 3

Schematic diagram of the propeller-shafting system

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Figure 4

Dynamic model of the inertial actuator

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Figure 5

Circumferential array of actuators on the hull end plate

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Figure 6

Positive directions of the forces, moments, displacements, and slopes for the shells and plates

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Figure 7

Definition of the coordinate system for the far field point

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Figure 8

Uncontrolled and controlled responses of the cylindrical hull axial displacement at x = 2 m

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Figure 9

Sound pressure level at θ = 0

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Figure 10

Optimal control force amplitudes of a single actuator in the two control arrays using DSAS (2f, 8e)

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Figure 11

Sound power level

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Figure 12

Directivity pattern at the first three hull resonances fundamental 22.5 Hz (a), 43.5 Hz (b), 70.5 Hz (c)

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