Simscape Multibody will not move

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Andy Wileman
Andy Wileman 2021 年 11 月 30 日
コメント済み: Andy Wileman 2021 年 12 月 4 日
Hi,
I wonder if anyone may be able to help. I'm constructing a landing gear model and have added a virtual runway underneath the model. Where the wheels dropped down and settled before, they no longer drop (see pictures) since adding the runway. The landing gear is a imported cad model, where the runway has been implemented as in the code below. I was wondering if it because of a difference in the datums? Does anyone know how to make the wheels drop so they sit nautrally on top of the runway? My next stage is to apply force from the virtual runway upwards, so I can measure movement within the landing gear - with a view to calculating stresses within the frame if this is possible.
Kind regards,
Andy

採用された回答

Steve Miller
Steve Miller 2021 年 11 月 30 日
Hi Andy - you appear to have rigidly attached your wheels to the platform and to the World frame. Your landing gear should be connected to the World frame only via a joint (Prismatic, 6-DOF, ...) and your Platform should be connected to World via a Rigid Transform.
If you post the entire model we can check it more closely.
--Steve
  2 件のコメント
Steve Miller
Steve Miller 2021 年 12 月 4 日
Hi Andy- I am missing all the geometry files, so I cannot look at your model.
For tire stiffness, if you put a Prismatic Joint (or other joint) between the tire and the ground platform, you can use joint limits to specify a linear stiffness. You can also use the Spatial Contact Force block to specify contact between shapes.
--Steve

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その他の回答 (1 件)

Andy Wileman
Andy Wileman 2021 年 12 月 4 日
Hi Steve,
Thanks for getting back to me. This should be a straightforward! I've followed your advice about inserting a prismatic joint etc. and frustratingly it is nearly there. I've been trying to follow the Matlab suspension tutorial as well, I suspect the problem might be lining up the platform (which is defined on the World coordinates) with the CAD model.
I have attached all the files including the geometry, I would be very grateful if you can take a quick look.
I will also tru the idea with the tyres as you suggested if you can get the model working.
Kind regards,
Andy
  2 件のコメント
Andy Wileman
Andy Wileman 2021 年 12 月 4 日
Hi Steve,
That's absolutely brilliant, I don't think I would have got there on my own. I can't thank you enough - I've been on this all week.
Kind regards,
Andy

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