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Monthly Report for Space Robotic FMS PreCommercialization Development July 31, 2020


Developing means of integrating recent test data with existing analytical and simulated results.


No change.


No change.


Reviewing first non-linear range internal force values for axial loading degree of freedom. The test participation factor can replace estimated values now. They are surprisingly close.

Software Simulation

no change

Breadboard Manufacturing

no change

Breadboard Testing

no new testing

Plans for August.

Begin to update axial degree of freedom channel

What's so tough?

Temperature Lack of atmosphere drives temperatures to be either hot in sun or cold in shade. Robots are for moving things around, so they go into and out of shade repeatedly.

Force not directly measureable. It can be inferred from strain or deflection. Such measures are affected by thermal distorsion.

Large dynamic range linear vs rotation forces. Long robot arms and the need to capture 'free flyers' generates large rotational forces.

High Stiffness A high stiffness requirement, makes measurement of strain or deflection more difficult to isolate from thermal distorsion.

Drift Space operations tend to be slow - often taken over a period of hours.

6 dof It is important to distinguish all 6 degrees of force measurement, but the shear and moment loading cases can produce difficult to distinguish effects