Simscape Multibody will not move
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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
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채택된 답변
Steve Miller
2021년 11월 30일
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
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Steve Miller
2021년 12월 4일
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
추가 답변 (1개)
Andy Wileman
2021년 12월 4일
댓글 수: 2
Steve Miller
2021년 12월 4일
Quite close! I have added frames at the wheel centers and used joint limits in a 6-DOF joint to model the contact between the tires and the platform. I had to re-orient a few frames along the way. Model is attached with some annotations to indicate where I made changes.
--Steve
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