Patent ID: 6178246
Filing Date: 2001-01-23
Classification: G10K

Abstract:
An apparatus for actively suppressing noise radiated by a component having a surface, said apparatus comprising at least a first sensor and a second sensor secured to said surface for producing noise representing control signals, an actuator (6, 47) connected to said surface (1, 21, 31, 42.1) for suppressing said noise in response to said control signal generated by said first and second sensors, wherein said first sensor has a first axially selective directional sensitivity effective in an x-direction for integrating vibrations in said x-direction to produce an x-direction sum signal (Sx) representing noise causing vibration components, and wherein said second sensor has a second axially selective directional sensitivity effective in a y-direction for simultaneously integrating vibrations in said y-direction to produce a y-direction sum signal (Sy) representing noise causing vibration components, whereby each first and second sensor integrates said vibrations in its own axial direction (x, y), wherein said first and second directional sensitivities extend orthogonally relative to each other, and wherein said at least first and second sensors are arranged with their respective axially selective directional sensitivities for sensing a vibration base mode and other vibration modes of said radiating component, said other vibration modes having uneven, odd numbers.