ROS探索总结-6.使用smartcar进行仿真
使用smartcar进行仿真
之前的博客中，我们使用rviz进行了TurtleBot的仿真，而且使用urdf文件建立了自己的机器人smartcar，本篇博客是将两者进行结合，使用smartcar机器人在rviz中进行仿真。
urdf相关工具安装（补充）
- 安装urdf_tutorial，可以使用其中的例子
$ sudo apt-get install ros-indigo-urdf-tutorial
- 安装liburdfdom-tools，提供对urdf文件的检查
$ sudo apt-get install liburdfdom-tools
一、模型完善
之前我们使用的都是urdf文件格式的模型，在很多情况下，ROS对urdf文件的支持并不是很好，使用宏定义的.xacro文件兼容性更好，扩展性也更好。所以我们把之前的urdf文件重新整理编写成.xacro文件。
.xacro文件主要分为三部分：
1、机器人主体smartcar_body.urdf.xacro
<?xml version="1.0"?>
<robot name="smartcar" xmlns:xacro="http://ros.org/wiki/xacro">
<property name="M_PI" value="3.14159"/>
<!-- Macro for SmartCar body. Including Gazebo extensions, but does not include Kinect -->
<include filename="$(find smartcar_description)/urdf/gazebo.urdf.xacro"/>
<property name="base_x" value="0.33" />
<property name="base_y" value="0.33" />
<xacro:macro name="smartcar_body">
<link name="base_link">
<inertial>
<origin xyz="0 0 0.055"/>
<mass value="1.0" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<box size="0.25 .16 .05"/>
</geometry>
<origin rpy="0 0 0" xyz="0 0 0.055"/>
<material name="blue">
<color rgba="0 0 .8 1"/>
</material>
</visual>
<collision>
<origin rpy="0 0 0" xyz="0 0 0.055"/>
<geometry>
<box size="0.25 .16 .05" />
</geometry>
</collision>
</link>
<link name="left_front_wheel">
<inertial>
<origin xyz="0.08 0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="0.08 0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="left_front_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="left_front_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="0.08 0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="right_front_wheel">
<inertial>
<origin xyz="0.08 -0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="0.08 -0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="right_front_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="right_front_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="0.08 -0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="left_back_wheel">
<inertial>
<origin xyz="-0.08 0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="left_back_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="left_back_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="right_back_wheel">
<inertial>
<origin xyz="-0.08 -0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 -0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="right_back_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="right_back_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 -0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="head">
<inertial>
<origin xyz="0.08 0 0.08"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<box size=".02 .03 .03"/>
</geometry>
<material name="white">
<color rgba="1 1 1 1"/>
</material>
</visual>
<collision>
<origin xyz="0.08 0 0.08"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="tobox" type="fixed">
<parent link="base_link"/>
<child link="head"/>
<origin xyz="0.08 0 0.08"/>
</joint>
</xacro:macro>
</robot>
注意：原版本在indigo可能运行有问题，修改的indigo版本如下：
<?xml version="1.0"?>
<robot name="smartcar" xmlns:xacro="http://ros.org/wiki/xacro">
<xacro:property name="M_PI" value="3.14159"/>
<!-- Macro for SmartCar body. Including Gazebo extensions, but does not include Kinect -->
<xacro:include filename="$(find smartcar_description)/urdf/gazebo.urdf.xacro"/>
<xacro:property name="base_x" value="0.33" />
<xacro:property name="base_y" value="0.33" />
<xacro:macro name="smartcar_body">
<link name="base_link">
<inertial>
<origin xyz="0 0 0.055"/>
<mass value="1.0" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<box size="0.25 .16 .05"/>
</geometry>
<origin rpy="0 0 0" xyz="0 0 0.055"/>
<material name="blue">
<color rgba="0 0 .8 1"/>
</material>
</visual>
<collision>
<origin rpy="0 0 0" xyz="0 0 0.055"/>
<geometry>
<box size="0.25 .16 .05" />
</geometry>
</collision>
</link>
<link name="left_front_wheel">
<inertial>
<origin xyz="0.08 0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="0.08 0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="left_front_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="left_front_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="0.08 0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="right_front_wheel">
<inertial>
<origin xyz="0.08 -0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="0.08 -0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="right_front_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="right_front_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="0.08 -0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="left_back_wheel">
<inertial>
<origin xyz="-0.08 0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="left_back_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="left_back_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="right_back_wheel">
<inertial>
<origin xyz="-0.08 -0.08 0.025"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
<material name="black">
<color rgba="0 0 0 1"/>
</material>
</visual>
<collision>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 -0.08 0.025"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="right_back_wheel_joint" type="continuous">
<axis xyz="0 0 1"/>
<parent link="base_link"/>
<child link="right_back_wheel"/>
<origin rpy="0 1.57075 1.57075" xyz="-0.08 -0.08 0.025"/>
<limit effort="100" velocity="100"/>
<joint_properties damping="0.0" friction="0.0"/>
</joint>
<link name="head">
<inertial>
<origin xyz="0.08 0 0.08"/>
<mass value="0.1" />
<inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
</inertial>
<visual>
<geometry>
<box size=".02 .03 .03"/>
</geometry>
<material name="white">
<color rgba="1 1 1 1"/>
</material>
</visual>
<collision>
<origin xyz="0.08 0 0.08"/>
<geometry>
<cylinder length=".02" radius="0.025"/>
</geometry>
</collision>
</link>
<joint name="tobox" type="fixed">
<parent link="base_link"/>
<child link="head"/>
<origin xyz="0.08 0 0.08"/>
</joint>
</xacro:macro>
</robot>
- 修改
property，为xacro:property - 修改
include， 为xacro:include
2、gazebo属性部分 gazebo.urdf.xacro
<?xml version="1.0"?>
<robot xmlns:controller="http://playerstage.sourceforge.net/gazebo/xmlschema/#controller"
xmlns:interface="http://playerstage.sourceforge.net/gazebo/xmlschema/#interface"
xmlns:sensor="http://playerstage.sourceforge.net/gazebo/xmlschema/#sensor"
xmlns:xacro="http://ros.org/wiki/xacro"
name="smartcar_gazebo">
<!-- ASUS Xtion PRO camera for simulation -->
<!-- gazebo_ros_wge100 plugin is in kt2_gazebo_plugins package -->
<xacro:macro name="smartcar_sim">
<gazebo reference="base_link">
<material>Gazebo/Blue</material>
</gazebo>
<gazebo reference="right_front_wheel">
<material>Gazebo/FlatBlack</material>
</gazebo>
<gazebo reference="right_back_wheel">
<material>Gazebo/FlatBlack</material>
</gazebo>
<gazebo reference="left_front_wheel">
<material>Gazebo/FlatBlack</material>
</gazebo>
<gazebo reference="left_back_wheel">
<material>Gazebo/FlatBlack</material>
</gazebo>
<gazebo reference="head">
<material>Gazebo/White</material>
</gazebo>
</xacro:macro>
</robot>
3、主文件 smartcar.urdf.xacro
<?xml version="1.0"?>
<robot name="smartcar"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:gazebo="http://playerstage.sourceforge.net/gazebo/xmlschema/#gz"
xmlns:model="http://playerstage.sourceforge.net/gazebo/xmlschema/#model"
xmlns:sensor="http://playerstage.sourceforge.net/gazebo/xmlschema/#sensor"
xmlns:body="http://playerstage.sourceforge.net/gazebo/xmlschema/#body"
xmlns:geom="http://playerstage.sourceforge.net/gazebo/xmlschema/#geom"
xmlns:joint="http://playerstage.sourceforge.net/gazebo/xmlschema/#joint"
xmlns:controller="http://playerstage.sourceforge.net/gazebo/xmlschema/#controller"
xmlns:interface="http://playerstage.sourceforge.net/gazebo/xmlschema/#interface"
xmlns:rendering="http://playerstage.sourceforge.net/gazebo/xmlschema/#rendering"
xmlns:renderable="http://playerstage.sourceforge.net/gazebo/xmlschema/#renderable"
xmlns:physics="http://playerstage.sourceforge.net/gazebo/xmlschema/#physics"
xmlns:xacro="http://ros.org/wiki/xacro">
<include filename="$(find smartcar_description)/urdf/smartcar_body.urdf.xacro" />
<!-- Body of SmartCar, with plates, standoffs and Create (including sim sensors) -->
<smartcar_body/>
<smartcar_sim/>
</robot>
注意：原来的在indigo下运行有问题，修改的indigo版本如下：
<?xml version="1.0"?>
<robot name="smartcar"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:gazebo="http://playerstage.sourceforge.net/gazebo/xmlschema/#gz"
xmlns:model="http://playerstage.sourceforge.net/gazebo/xmlschema/#model"
xmlns:sensor="http://playerstage.sourceforge.net/gazebo/xmlschema/#sensor"
xmlns:body="http://playerstage.sourceforge.net/gazebo/xmlschema/#body"
xmlns:geom="http://playerstage.sourceforge.net/gazebo/xmlschema/#geom"
xmlns:joint="http://playerstage.sourceforge.net/gazebo/xmlschema/#joint"
xmlns:controller="http://playerstage.sourceforge.net/gazebo/xmlschema/#controller"
xmlns:interface="http://playerstage.sourceforge.net/gazebo/xmlschema/#interface"
xmlns:rendering="http://playerstage.sourceforge.net/gazebo/xmlschema/#rendering"
xmlns:renderable="http://playerstage.sourceforge.net/gazebo/xmlschema/#renderable"
xmlns:physics="http://playerstage.sourceforge.net/gazebo/xmlschema/#physics"
xmlns:xacro="http://ros.org/wiki/xacro">
<xacro:include filename="$(find smartcar_description)/urdf/smartcar_body.urdf.xacro" />
<!-- Body of SmartCar, with plates, standoffs and Create (including sim sensors) -->
<smartcar_body/>
<smartcar_sim/>
</robot>
- 修改
include， 为xacro:include
二、lanuch文件smartcar_display.rviz.launch
在launch文件中要启动节点和模拟器。
<launch>
<param name="/use_sim_time" value="false" />
<!-- Load the URDF/Xacro model of our robot -->
<arg name="urdf_file" default="$(find xacro)/xacro.py '$(find smartcar_description)/urdf/smartcar.urdf.xacro'" />
<arg name="gui" default="false" />
<param name="robot_description" command="$(arg urdf_file)" />
<param name="use_gui" value="$(arg gui)"/>
<node name="arbotix" pkg="arbotix_python" type="driver.py" output="screen">
<rosparam file="$(find smartcar_description)/config/smartcar_arbotix.yaml" command="load" />
<param name="sim" value="true"/>
</node>
<node name="joint_state_publisher" pkg="joint_state_publisher" type="joint_state_publisher" >
</node>
<node name="robot_state_publisher" pkg="robot_state_publisher" type="state_publisher">
<param name="publish_frequency" type="double" value="20.0" />
</node>
<!-- We need a static transforms for the wheels -->
<node pkg="tf" type="static_transform_publisher" name="odom_left_wheel_broadcaster" args="0 0 0 0 0 0 /base_link /left_front_link 100" />
<node pkg="tf" type="static_transform_publisher" name="odom_right_wheel_broadcaster" args="0 0 0 0 0 0 /base_link /right_front_link 100" />
<node name="rviz" pkg="rviz" type="rviz" args="-d $(find smartcar_description)/urdf.vcg" />
</launch>
注意：原来的版本在indigo运行有问题，修改的indigo版本如下：
<launch>
<param name="/use_sim_time" value="false" />
<!-- Load the URDF/Xacro model of our robot -->
<arg name="urdf_file" default="$(find xacro)/xacro.py '$(find smartcar_description)/urdf/smartcar.urdf.xacro'" />
<arg name="gui" default="false" />
<param name="robot_description" command="$(arg urdf_file)" />
<param name="use_gui" value="$(arg gui)"/>
<node name="arbotix" pkg="arbotix_python" type="arbotix_driver" output="screen">
<rosparam file="$(find smartcar_description)/config/smartcar_arbotix.yaml" command="load" />
<param name="sim" value="true"/>
</node>
<node name="joint_state_publisher" pkg="joint_state_publisher" type="joint_state_publisher" >
</node>
<node name="robot_state_publisher" pkg="robot_state_publisher" type="state_publisher">
<param name="publish_frequency" type="double" value="20.0" />
</node>
<!-- We need a static transforms for the wheels -->
<node pkg="tf" type="static_transform_publisher" name="odom_left_wheel_broadcaster" args="0 0 0 0 0 0 /base_link /left_front_link 100" />
<node pkg="tf" type="static_transform_publisher" name="odom_right_wheel_broadcaster" args="0 0 0 0 0 0 /base_link /right_front_link 100" />
<node name="rviz" pkg="rviz" type="rviz" args="-d $(find smartcar_description)/urdf.rviz" />
</launch>
修改driver.py为arbotix_driver
修改urdf.vcg 为urdf.rviz,确保在smartcar_description目录下有urdf.rviz。从urdf_tutorial目录提取
$ cd ~/catkin_ws/src/smartcar_description
$ cp /opt/ros/indigo/share/urdf_tutorial/urdf.rviz .
- 在indigo版本里，新增smartcar_description/config/smartcar_arbotix.yaml文件，内容为：
port: /dev/ttyUSB0
baud: 115200
rate: 20
sync_write: True
sync_read: True
read_rate: 20
write_rate: 20
controllers: {
# Pololu motors: 1856 cpr = 0.3888105m travel = 4773 ticks per meter (empirical: 4100)
base_controller: {type: diff_controller, base_frame_id: base_link, base_width: 0.26, ticks_meter: 4100, Kp: 12, Kd: 12, Ki: 0, Ko: 50, accel_limit: 1.0 }
}
三、仿真测试
首先运行lanuch，既可以看到rviz中的机器人：
roslaunch smartcar_description smartcar_display.rviz.launch
效果图：
发布一条动作的消息：
rostopic pub -r 10 /cmd_vel geometry_msgs/Twist '{linear: {x: 0.5, y: 0, z: 0}, angular: {x: 0, y: 0, z: 0.5}}'
效果图：
四、节点关系
运行rqt_graph：
$ rqt_graph
效果图：
参考：
- http://wiki.ros.org/urdf/Tutorials
- http://wiki.ros.org/xacro
- http://blog.csdn.net/sunbibei/article/details/52297524
- http://blog.csdn.net/sujun3304/article/details/18962719
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