ASB Quaternion to rotation angles block creating input data dependency

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cdlapoin 2022-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/1782480-asb-quaternion-to-rotation-angles-block-creating-input-data-dependency

回答： Steve Miller 2022-11-26

I wanted to do an experiment for a pitch angle controller, and as a shortcut/oversimplification I want to pull pitch angle directly from the simscape 6-DOF joint connecting my vehicle to the world frame. The above schematic causes an input data dependency error. Removing the QtRA block removed the error but I don't understand what the issue is.

From reading, this error comes from requesting a value before it is available, so I thought it might be resolved by initializing the 6-DOF rotation angles by specifying a position state target (of 0) for the spherical primitive that doesn't seem to anything helpful here.

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cdlapoin 2022-8-20

is it possible that q being the name of the input for the Quat2RA block and also the input position for the simscape Revolute Joints is the issue? Can either of those be changed? I would try as a troubleshooting step but cannot find a way?

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Answer 1

Steve Miller 2022-11-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1782480-asb-quaternion-to-rotation-angles-block-creating-input-data-dependency#answer_1112633

Q_to_Rot_Angles.slx

I made a simple version of your model and it seemed to work fine. The Simulink model is attached and a screenshot is below. I suspect the issue has to do with a model parameter that isn't defined.

--Steve