quadruped_ros2_control/descriptions/anybotics/anymal_c_description/xacro/gazebo.xacro

<?xml version="1.0"?>
<robot xmlns:xacro="http://www.ros.org/wiki/xacro">

  <ros2_control name="GazeboSystem" type="system">
    <hardware>
      <plugin>gz_ros2_control/GazeboSimSystem</plugin>
    </hardware>

    <joint name="FR_HipX">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="FR_HipY">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="FR_Knee">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="FL_HipX">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="FL_HipY">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="FL_Knee">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="HR_HipX">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="HR_HipY">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="HR_Knee">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="HL_HipX">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="HL_HipY">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <joint name="HL_Knee">
      <command_interface name="effort" initial_value="0.0"/>
      <state_interface name="position"/>
      <state_interface name="velocity"/>
      <state_interface name="effort"/>
    </joint>

    <sensor name="imu_sensor">
      <state_interface name="orientation.x"/>
      <state_interface name="orientation.y"/>
      <state_interface name="orientation.z"/>
      <state_interface name="orientation.w"/>
      <state_interface name="angular_velocity.x"/>
      <state_interface name="angular_velocity.y"/>
      <state_interface name="angular_velocity.z"/>
      <state_interface name="linear_acceleration.x"/>
      <state_interface name="linear_acceleration.y"/>
      <state_interface name="linear_acceleration.z"/>
    </sensor>
  </ros2_control>

  <gazebo>
    <plugin filename="gz_ros2_control-system" name="gz_ros2_control::GazeboSimROS2ControlPlugin">
      <parameters>$(find anymal_c_description)/config/gazebo.yaml</parameters>
    </plugin>
    <plugin filename="gz-sim-imu-system"
            name="gz::sim::systems::Imu">
    </plugin>
  </gazebo>

  <gazebo reference="trunk">
    <mu1>0.6</mu1>
    <mu2>0.6</mu2>
    <self_collide>1</self_collide>
    <visual>
      <material>
        <ambient>.05 .05 .05 1.0</ambient>
        <diffuse>.05 .05 .05 1.0</diffuse>
        <specular>.05 .05 .05 1.0</specular>
      </material>
    </visual>
  </gazebo>

  <gazebo reference="imu_link">
    <sensor name="imu_sensor" type="imu">
      <always_on>1</always_on>
      <update_rate>500</update_rate>
      <visualize>true</visualize>
      <topic>imu</topic>
      <imu>
        <angular_velocity>
          <x>
<!--            <noise type="gaussian">-->
<!--              <mean>0.0</mean>-->
<!--              <stddev>2e-4</stddev>-->
<!--              <bias_mean>0.0000075</bias_mean>-->
<!--              <bias_stddev>0.0000008</bias_stddev>-->
<!--            </noise>-->
          </x>
          <y>
<!--            <noise type="gaussian">-->
<!--              <mean>0.0</mean>-->
<!--              <stddev>2e-4</stddev>-->
<!--              <bias_mean>0.0000075</bias_mean>-->
<!--              <bias_stddev>0.0000008</bias_stddev>-->
<!--            </noise>-->
          </y>
          <z>
<!--            <noise type="gaussian">-->
<!--              <mean>0.0</mean>-->
<!--              <stddev>2e-4</stddev>-->
<!--              <bias_mean>0.0000075</bias_mean>-->
<!--              <bias_stddev>0.0000008</bias_stddev>-->
<!--            </noise>-->
          </z>
        </angular_velocity>
        <linear_acceleration>
          <x>
<!--            <noise type="gaussian">-->
<!--              <mean>0.0</mean>-->
<!--              <stddev>1.7e-2</stddev>-->
<!--              <bias_mean>0.1</bias_mean>-->
<!--              <bias_stddev>0.001</bias_stddev>-->
<!--            </noise>-->
          </x>
          <y>
<!--            <noise type="gaussian">-->
<!--              <mean>0.0</mean>-->
<!--              <stddev>1.7e-2</stddev>-->
<!--              <bias_mean>0.1</bias_mean>-->
<!--              <bias_stddev>0.001</bias_stddev>-->
<!--            </noise>-->
          </y>
          <z>
<!--            <noise type="gaussian">-->
<!--              <mean>0.0</mean>-->
<!--              <stddev>1.7e-2</stddev>-->
<!--              <bias_mean>0.1</bias_mean>-->
<!--              <bias_stddev>0.001</bias_stddev>-->
<!--            </noise>-->
          </z>
        </linear_acceleration>
      </imu>
    </sensor>
  </gazebo>
  <gazebo reference="imu_joint">
    <disableFixedJointLumping>true</disableFixedJointLumping>
  </gazebo>

</robot>