Patent ID: 6138947
Filing Date: 2000-10-31
Classification: G10K

Abstract:
An active noise control system for minimizing undesirable acoustic noise in a defined volume, the undesirable acoustic noise being generated by high frequency structural vibrations emanating from a vibration source structurally coupled to the defined volume, the active noise control system comprising:attachment feet with flanges formed at a location where a portion of a gearbox and a portion of an airframe are connected to one another;a sensor subsystem disposed in combination with the defined volume for sensing the undesirable acoustic noise in the defined volume;an actuator subsystem mounted at the flanges; anda controller functionally interconnecting said sensor subsystem to said actuator subsystem, said controller being operative to receive input from said sensor subsystem and to transmit command signals to said actuator subsystem in response thereto for generating selected high frequency counter-vibrations that are interactive with the high frequency structural vibrations to minimize the undesirable acoustic noise in the defined volume.