little 3 wheels car

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SIRX
Posts: 16
Joined: 17 Mar 2018, 15:22

little 3 wheels car

Post by SIRX » 20 Jun 2018, 14:45

Hi to all,
I am build a 3 wheel car model following Hackerman library model:

- chassis -3 prismatic joint - 3hubs - 3 revolute joints and 3 wheels.

Simulating, my model runs but there is a little background noise on the wheels that do a very liffle drift on all the model, in others words the model moves very slowly. Instead the Hackermann model is perfectly stop. In fact measuring the forces on the wheels in each of the model, it reveals that in the Hackermann model the behaviour of the forces is as a damped sinusoid that go asintodically to zero instead in my model the forces have a damped sinusoidal trend but at the end there is permanent noise from which the drift depends.
Any suggestion is welcome
thanks

SRL_Max
Posts: 5
Joined: 13 Jun 2018, 09:02

Re: little 3 wheels car

Post by SRL_Max » 22 Jun 2018, 07:00

Hello,

Did you try to increase the mass and inertia of your model's parts? When they are too low I also experience jittering and/or sliding of my models.

Best,
Maxens

coppelia
Site Admin
Posts: 6683
Joined: 14 Dec 2012, 00:25

Re: little 3 wheels car

Post by coppelia » 23 Jun 2018, 18:11

Yes, Maxens's tip will probably help you. And make sure you do not have a ratio larger than 1-10 for masses or inertias in your vehicle. Or you try to switch to another physics engine that is more robust in that regards, for instance Vortex.

Cheers

SIRX
Posts: 16
Joined: 17 Mar 2018, 15:22

Re: little 3 wheels car

Post by SIRX » 24 Jun 2018, 12:09

Hi,
thanks very much, I will try
Cheers

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