In the gazebo environment, once dynamic parameters are added to the urdf model, the connecting rod will be fixed at the origin.

edit

In the gazebo environment, once dynamic parameters are added to the urdf model, the link will be fixed at the origin.

After adding the dynamics damping,the showed link will be fixed at the origin(or maybe world).

    <dynamics damping="0.7"/>

before adding the dynamics damping:

after adding the dynamics damping:

All urde files :

    <?xml version="1.0" encoding="utf-8"?>


       <!-- This URDF was automatically created by SolidWorks to URDF Exporter! Originally created by Stephen Brawner (brawner@gmail.com) 
             Commit Version: 1.5.1-0-g916b5db  Build Version: 1.5.7152.31018
             For more information, please see http://wiki.ros.org/sw_urdf_exporter -->


        <!-- Revolute-Revolute Manipulator -->
            <robot name="link" xmlns:xacro="http://www.ros.org/wiki/xacro">

              <!-- Import all Gazebo-customization elem

        ents, including Gazebo colors -->


       <xacro:include filename="$(find link)/urdf/link.gazebo" />

          <!-- Used for fixing robot to Gazebo 'base_link' -->
          <link name="world"/>

      <joint name="fixed" type="fixed">
        <parent link="world"/>
        <child link="base_link"/>
      </joint>

      <link
        name="base_link">
    <inertial>
      <origin
        xyz="5.41431391044674E-19 -3.81599768090245E-18 0.0119651355617924"
        rpy="0 0 0" />
      <mass
        value="0.317346214028947" />
      <inertia
        ixx="0.000400193890599361"
        ixy="-3.73238496454284E-22"
        ixz="-4.8058493695367E-21"
        iyy="0.000399358915837397"
        iyz="-4.57713225377642E-20"
        izz="0.000705715767674914" />
    </inertial>
    <visual>
      <origin
        xyz="0 0 0"
        rpy="0 0 0" />
      <geometry>
        <mesh
          filename="package://link/meshes/base_link.STL" />
      </geometry>
      <material
        name="">
        <color
          rgba="1 1 1 1" />
      </material>
    </visual>
    <collision>
      <origin
        xyz="0 0 0"
        rpy="0 0 0" />
      <geometry>
        <mesh
          filename="package://link/meshes/base_link.STL" />
      </geometry>
    </collision>
  </link>
  <link
    name="link1">
    <inertial>
      <origin
        xyz="0.05 1.04083408558608E-17 0"
        rpy="0 0 0" />
      <mass
        value="0.0335342917352885" />
      <inertia
        ixx="2.87735927381987E-06"
        ixy="2.32934060494933E-21"
        ixz="2.30346855521167E-22"
        iyy="3.89630886120412E-05"
        iyz="1.52906451041926E-23"
        izz="4.12815430236062E-05" />
    </inertial>
    <visual>
      <origin
        xyz="0 0 0"
        rpy="0 0 0" />
      <geometry>
        <mesh
          filename="package://link/meshes/link1.STL" />
      </geometry>
      <material


name="">
    <color
      rgba="1 1 1 1" />
  </material>
</visual>
<collision>
  <origin
    xyz="0 0 0"
    rpy="0 0 0" />
  <geometry>
    <mesh
      filename="package://link/meshes/link1.STL" />
  </geometry>
    </collision>
  </link>
  <joint
    name="joint1"
    type="continuous">
    <origin
      xyz="0 0 0.06"
      rpy="-1.5708 -1.033 0" />
    <parent
      link="base_link" />
    <child
      link="link1" />
    <axis
      xyz="0 0 -1" />
    <dynamics damping="0.7"/>
  </joint>
  <link
    name="link2">
    <inertial>
      <origin
        xyz="0.0847185207825683 -7.7715611723761E-16 -5.85317276699049E-18"
        rpy="0 0 0" />
      <mass
        value="0.0777109513774519" />
      <inertia
        ixx="9.11722126446958E-06"
        ixy="6.56450534122083E-21"
        ixz="2.83871210352196E-21"
        iyy="0.0003324057043755"
        iyz="7.17448377804427E-22"
        izz="0.000335193630705286" />
    </inertial>
    <visual>
      <origin
        xyz="0 0 0"
        rpy="0 0 0" />
      <geometry>
        <mesh
          filename="package://link/meshes/link2.STL" />
      </geometry>
      <material
        name="">
        <color
          rgba="1 1 1 1" />
      < ...