case | exoskeleton

“Taking big steps towards full mobility”

THE CHALLENGE

In the hip and knee joints of the MARCH II exoskeleton, high precision and great forces come together. One of the requirements for the joint design was that the distance between the magnetic encoder ring and the sensor should not exceed the boundaries of 0.1 mm and 0.3 mm. The sensor reads out the angle of the joint, so when big forces are acting on the joint, only minimal deformations can be allowed.

OUR SOLUTION

To ensure that high forces do not deform the knee joints too much, the team performed Finite Element Analyses, with the support of Code Product Solutions. Together, we have made FEA-based adjustments, which have led to design improvements and the final joint design of the exoskeleton.



The original design of the knee joint.



The final knee joint.
WHAT WE DID

DESIGN IMPROVEMENTS

We have adjusted the housing to make the joint stiffer. Because of these improvements, the joint will not deform and it will therefore be able to measure the angle of the joint in all circumstances.

MECHANICAL END STOP

Another focus point during the FE analysis was the mechanical end stop. This is a safety system that makes sure the knee will never be able to rotate more than the knee of the pilot. We looked into the shape of this part to make sure the pilot nor the exoskeleton will be damaged, even during unexpected situations.

OUR RESULT

We were able to reach a much better division of forces. In addition, together we could accomplish a broader, flat end stop. With these improvements, the final use of the exoskeleton is optimised.

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