Dynamic pitch adjustment devices, systems, and methods

A vibration control device for a rotary wing aircraft having a rotor including a plurality of blades each attached to a hub at its root end and capable of pitching with respect to the hub, the device comprising:

• a fluid-elastic pitchlink connected between the root end of the respective one of the plurality of blades and the hub, the fluid-elastic pitchlink comprising a dynamic link element that comprises:
• a fluid inertia track through which fluid is movable in response to harmonic loads on the rotor;
• and
• an elastomeric element configured to allow axial compression and extension of the fluid-elastic pitchlink;
• wherein the fluid-elastic pitchlink is passively adjustable in response to aerodynamic loading on the plurality of blades to adjust a pitch of one of the plurality of blades with respect to the hub based on a frequency of the aerodynamic loading.