Active suppression of acoustic radiation from a submarine hull using inertial actuators

This work investigates the use of inertial actuators to actively reduce the sound radiated by a submarine hull under harmonic excitation from the propeller. The axial fluctuating forces from the propeller are tonal at the blade passing frequency. The hull is modelled as a fluid loaded cylindrical shell with ring stiffeners and two equally spaced bulkheads. The cylinder is closed by end plates and conical end caps. The forces from the propeller are transmitted to the hull by a rigid foundation connected to the shaft with a thrust bearing. 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 active structural acoustic control are implemented to attenuate the structural and acoustic responses of the submarine. 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 structure-borne sound due to hull vibration.

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