Oneshape Model Simulation working but not Simscape?

Hello, I'm learning MatLab/Simulink/Simscape and I've been impressed by the capacity of Simulink to integrate Onshape models. Unfortunately moving to a personal example/Oneshape model that perfectly works/animates into Onshape, when running the model in simulink, simulink gives an error that I don't know how to solve. Not that I don't know what the message means or where to look but the error does not make sense and therefore I do not know what to do to solve it.

Error message attached. * Model not assembled: position violation * Resolve this issue in order to simulate the model

Sources: Oneshape model: https://cad.onshape.com/documents/597f85b6cc02d6dc4e53c6e1/w/66556db52779a3bc060b1774/e/4864d428da8397634c165b1d Simulink model from my google drive: https://drive.google.com/file/d/0Bwqs0N2V79tBNHN5cWRWaUVqODg/view?usp=sharing

If you don't mind looking and let me know what you think/where I'm making a mistake and how to solve it, please let me know. Deeply appreciated.

Dimitri

Answer 1

[Steve Miller]

Hi Dmitri - I took a quick look.

The diagnostic points to Revolute 2 being a problem. I replaced it with a Cylindrical Joint and it simulates and everything moves.

I then looked at your Onshape model. The Mate Connectors for Revolute 2 are not coincident - they are separated along an global y axis (z-axis for the mate connectors).

There are multiple ways to solve this problem, but you as the designer probably know which one is the best: 1. Move your Mate Connectors so that they are coincident (or create a new Mate Connector) 2. Change Revolute 2 to a Cylindrical Mate

Looks like a nice model! --Steve

[Dimitri Despierres]

Thanks a lot Steve. First for such a quick answer and second for helping me solving this. This is a typical model for sensing sea level relative to the hull of a dingy to make it fly steadily. The response is an automatic adjustment of the flap that creates less or more lift. Learning to do this in simulink is a real short cut for tuning mechanical control system like this. I'm really impressed by the compatibility between Onshape and Simulink. Models can be quite complex to create/build and time consuming in simulink when inexperienced like me but now this opens new doors! This is awesome. As a beginner, I'm quite excited to do more and more tutorials and mix with my simple cad model.

Thank you so much. Dimitri

[Steve Miller]

Was my pleasure to help! Thanks for the background information. Very cool mechanical control system. It really helped that you could share the URL - made it easy for me to check both the source and the converted model.

--Steve