Spatial contact force block

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Ayham Aljawabrah
Ayham Aljawabrah 2021-3-10
评论： Yifeng Tang 2021-5-5
Hi
I am trying to build a model for the dog clutch with Simscape multibody as shown in the below figure. each side can rotate independantly, and the dog teeth contact each other. the model is translated from solidworks using Multibody link. To model the contact, I am using the spactial contact force block. I tired to run the model and rotate one dog side but it penetrate the other one.
According to MATLAB help the geomtry export should be turned on and 'export entire geometry' can be seen. However, In my case, I see only the option 'convex Hull'
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Ayham Aljawabrah
Ayham Aljawabrah 2021-5-4
Yes, it can be done if I model the base and teeth as different parts then assamble them into an assembly. You suggested a good procedure to follow. Thanks
Yifeng Tang
Yifeng Tang 2021-5-5
Just summarize the discussion into the answer.
Have fun with your modeling!

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Yifeng Tang
Yifeng Tang 2021-5-5
Contact force only works with Convex Hull at this moment. See Documentation page here: https://www.mathworks.com/help/releases/R2021a/physmod/sm/ref/spatialcontactforce.html?s_tid=doc_srchtitle
I think it's possible to separate the teeths as individual solid blocks. This way they'll all be sufficiently described by convex hulls. If possible, separate the teeths from the base in CAD so they appear as individual parts in Multibody. You may then do the convex hull thing with each teeth. Try it with a small number of teeth and before going to all 30 of them.

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