Simscape Multibody will not move
4 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Andy Wileman
il 30 Nov 2021
Commentato: Andy Wileman
il 4 Dic 2021
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
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/818894/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/818899/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/818904/image.png)
0 Commenti
Risposta accettata
Steve Miller
il 30 Nov 2021
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 Commenti
Steve Miller
il 4 Dic 2021
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
Più risposte (1)
Andy Wileman
il 4 Dic 2021
2 Commenti
Steve Miller
il 4 Dic 2021
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
Vedere anche
Categorie
Scopri di più su Simscape Multibody in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!