Helicopter active small control system (HELICOPTER ACTIVE NOISE CONTROL SYSTEM)

摘要

The present invention relates to a helicopter active noise control (ANC) system wherein the system operates to effectively attenuate one or more high frequency vibrations originating from a main transmission gearbox at a gearbox / gas connection point, thereby reducing the internal vibration level of the helicopter And is designed to minimize contamination forces resulting from operation of the system actuator; The ANC system comprises a modified transmission beam 12 mechanically reinforced to act as a rigid body for one or more high frequency vibrations, a plurality of actuators 20 disposed in combination with the correction transmission beam 12, A plurality of sensors 30 arranged in combination with a correction transmission beam 12 that are spaced apart in a collinear fashion from the functional interactions with the respective actuators 20 and respective actuators 30 having respective functionally correlated sensors 30, And a controller (40) connected to the controller (20). Each transmission beam 12 may be mechanically reinforced to its full or each local point of seg-ment adjacent to each mounting hardpoint 14. [ Each sensor 30 is actuated to sense a component of the signal dimension of one or more high frequency vibrations and to generate a representative signal therefrom. Each controller 40 is operated by a signal that generates a command signal to control the operation of each actuator 20. [ Each actuator 20 operates on a command signal that generates a resistance of a dimension with frequency, magnitude and phase to effectively attenuate the components of each dimension of one or more high frequencies originating from the main transmission storage box. In addition, each actuator 20 operates on a command signal that causes cancellation, which suppresses the fouling forces that result from the action of the actuator 20.