Just a short post to let you know that I am still playing around, albeit at a slow rate, with modeling.
For my two and three segmented model, I used, like Jorgensen, relative torques at the hinges. This approach can simulate wrist action or the elbows, but not hitting and/or retaining with the trail hand/arm. Introducing arbitrary forces, relative to an inertial frame, into a model, is tedious, especially for my 3 segmented model. Found an elegant way to derive these generalized forces for the Lagrangian equations.
I have to confirm this but feel that modeling the Bertholy claw will not show up too much different from the retaining action modeled presently with a dead stop between arms and club. I can't go too far with a simple generic model with no actual input from experiments on a real golfer to give me some guidelines.
The dead stop is like a threshold device, I can set a trip level, using force, time or angles, and either it retains or lets go. However with an external force, used to retain, I probably can play with a more graduated approach. Having, for instance, an external retaining force push the club back onto its ‘dead stop' position and once the centrifugal force builds up and exceeds the external force let it gently take its natural course. Moreover the amplitude of the retaining force itself could further be modulated, to reduce in the down swing, as you suggested.
Things will be a on low fire for the next two or three weeks but hope to be able to be a little more active thereafter.
mandrin
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