higher harmonic control


Also found in: Acronyms.

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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