SDF: How to fix a model to the world?

asked 2018-07-23 15:55:15 -0600

pbelanger
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Hello,

So I've set up an arm model in an SDF file and have input correct values for mass, CoM, and inertia tensor, but am having trouble figuring out how to fix the arm to the world. I have tried giving the base of the arm an arbitrarily high mass, but this does not seem to work well. I figure that there must be a method to hold the base of the arm static relative to the default ground_plane in the gazebo world but can't seem to figure it out. All solutions seem to be using URDF, which I am not.

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answered 2018-07-24 09:18:54 -0600

pbelanger
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I figured out what I was doing wrong here. When I tried to specify a link to the world, I didn't specify the model name.

A link like the following will prevent the link named base of a model named arm from moving relative to the world:

<link name="world_fix">
    <parent>world</parent>
    <child>arm::base</child>
</link>

Placing this in the root of your <model> will then prevent the base from moving.

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Shouldn't it rather be a fixed type joint, as described in this tutorial? http://gazebosim.org/tutorials/?tut=ros_urdf

maksymczech ( 2018-09-11 05:45:55 -0600 )edit

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answered 2022-04-18 09:43:46 -0600

weirdcookie
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for me, what worked was adding this inside the <model> in the .sdf file

<link name="world_fix"> 
    </link> <!-- I needed to close the link tag -->
    <joint name ="weld" type="fixed">
        <parent>world</parent> 
        <child>base</child> <!-- put here the name of the base link -->
    </joint> <!-- close the joint tag -->

Ps: Using noetic and gazebo 11 and sdf version 1.7

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SDF: How to fix a model to the world?

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