How do you represent contact with the ground in simscape?

조회 수: 38(최근 30일)
Josh
Josh 2013년 10월 13일
답변: Steve Miller 2017년 8월 6일
Hi,
I am (eventually) attempting to create a model which I can use to simulate control algorithms on a humanoid robot.
However whilst starting with simple models - I can't work out how to represent the ground, so that when any part of the bodies come into contact with this - they stop/bounce etc.
Is there any way of doing this?
thanks
  댓글 수: 1
prakhar jain
prakhar jain 2017년 2월 5일
check:sm_double_wishbone_suspension in simulink model. This should help you out. Check out the implementation of hard stop between the tyre and the road profile. That should help.

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답변(3개)

Steve Miller
Steve Miller 2017년 8월 6일
For 1D contact problems where only viscous friction is present, the hardstop block may be sufficient. However, for 2D and 3D problems or if the friction force depends on the normal force, I recommend looking at the File Exchange submission Simscape Multibody Contact Forces Library. It contains a library of blocks for use with Simscape Multibody that detect collision between various shapes, calculates the normal force and friction force on each part, and applies them to the colliding parts.
Below are a few animations that test models included in the submission. The Simscape Multibody Contact Forces Library contains the library for current and previous MATLAB releases.
Thanks,
--Steve
Here is another one:

Ryan G
Ryan G 2013년 10월 14일
You want the translational hard stop block.
With a bi-ped robot you'll probably want to make some design decisions with the model in terms of trading off fidelity for simulation speed and usability. Each point that is capable of hitting the ground would require a hardstop. So, if you don't need to model the robot falling over, you can skip modeling that ground-body interaction.

Zafb
Zafb 2015년 4월 4일
Hi, I am trying to do the same thing in 2015...Got some help from the following link which uses translational "hard stop" block http://www.mathworks.com/matlabcentral/answers/137140-contact-simulation-in-simmechanics
But the leg never bounces back, instead it goes through the ground. Even though I can see the contact force being produced when the leg hits the ground and is going through it.
Do you have any idea what might be wrong in my model?
Thanx in advance,
Zohaib
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Estácio Lima
Estácio Lima 2016년 7월 21일
편집: Estácio Lima 2016년 7월 21일
Try this paper .

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