Converted from a geometry_msgs/TwistStamped message.
http://docs.ros.org/api/geometry_msgs/html/msg/TwistStamped.html

linear.x (m/s^2)
linear.y (m/s^2)
linear.z (m/s^2)
angular.x (m/s^2)
angular.y (m/s^2)
angular.z (m/s^2)
