Item 1095

DESIGN: UniCopter ~ Vibration - Rotor Induced - Control - Closed-Loop Controller

Sensor:

  1. Strain gauges on the bottom (and the top?) of the root of all blades. To detect the reduction in thrust as the blade passes through the downwash or down draft of a blade of the other rotor. Will this work against cyclic control inputs?
  2. Accelerometers. Located in each blade, or in the center of the drive frame, or centrally in the fuselage.
  3. Could consider a sensor in the center of the drive frame to detect roll and thereby handle Lateral Dissymmetry of Lift and Drag.
  4. May also require Forward Velocity and Torque inputs.

Processor:

An adaptive device.

A CPU that reads the strain or motion, and the azimuth.

Stores the last (say 12) of these values.

Does a time (rotation) weighted averaging of these values, giving the latest the heaviest weighting.

Shifts all values at each input, dropping the oldest.

Outputs a signal so as to minimize the stress or motion.

If the output is driving Sealed Slats and Flaps then the output will consist of a number of azimuth activate and azimuth deactivate locations, since Slats and Flaps has only to positions.

 

Do all blades 'adjust' six times per revolution. ~ or ~ Do the upper, or lower blades 'adjust' three times per revolution; and the rotor and frame take the difference of moments between the upper and lower blade?

Actuator:

What? An activity or device that can quickly create additional thrust, for a short period of time.

Related Reports:

From MIT:

http://www.pkn.co.za/pap-XZDTM.html ~ Have hard copy.

 

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Last Revised: September 11, 2004