higher harmonic control

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higher harmonic control [¦hī·ər här′män·ik kən‚trōl]

(aerospace engineering)

An active control concept for reducing helicopter vibration levels, in which the control system senses vibrations originating with aerodynamic forces acting on the rotor blades, and applies high-frequency pitch motion to the rotor blades at very small angles to suppress this aerodynamic excitation.

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