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2015-09-30 02:00:48 -0500 asked a question exploration server died

Hello all,

sometimes the exploration server just died, and the clients are not able to reconnect.

[planner/explore_server-19] process has died [pid 3405, exit code -6, cmd /home/yupufeng/catkin_ws/devel/lib/frontier_exploration/explore_server move_base:=/planner/move_base __name:=explore_server __log:=/home/yupufeng/.ros/log/98ccbdea-673f-11e5-9c6d-94de8068b30c/planner-explore_server-19.log].

the server is already set as respawn="true" in the launch file.
node pkg="frontier_exploration" type="explore_server" name="explore_server" respawn="true" output="screen"

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2015-09-28 04:25:50 -0500 asked a question Turtlebot get stuck when no obstacles around

Hello all,

currently I am using a turtlebot for exploration (rtabmap for slam and frontier_exploration for exploration). The problem is, when the turtlebot drive on the inflation area and is given a goal in the opposite direction, it just get stuck like it cannot turn around or it thinks there are obstacles around.

Does it have something to do with the base local planner?

TrajectoryPlannerROS:

  # Robot Configuration Parameters - Kobuki
  max_vel_x: 0.5
  min_vel_x: 0.0 

#  max_vel_y: 0.0  # diff drive robot
#  min_vel_y: 0.0  # diff drive robot

  max_trans_vel: 0.5 # choose slightly less than the base's capability
  min_trans_vel: 0.1  # this is the min trans velocity when there is negligible rotational velocity
  trans_stopped_velocity: 0.1

#  max_rotational_vel: 3.0  # choose slightly less than the base's capability
#  min_rot_vel: 0.6  # this is the min angular velocity when there is negligible translational velocity

  max_vel_theta: 3.0
  min_vel_theta: -3.0

  rot_stopped_velocity: 0.2                               #0.4
  min_in_place_rotational_vel: 1.5                    #0.6
  min_in_place_vel_theta: 1.5

  acc_lim_x: 1.0
  acc_lim_theta: 3.2
  acc_lim_y: 0.0      # diff drive robot

  # Goal Tolerance Parameters
  yaw_goal_tolerance: 0.3
  xy_goal_tolerance: 0.25
  latch_xy_goal_tolerance: true

  # Forward Simulation Parameters
  sim_time: 1.5
  sim_granularity: 0.025
  vx_samples: 6
  vy_samples: 1       # diff drive robot, there is only one sample
  vtheta_samples: 20

  meter_scoring: true

  pdist_scale: 0.2                    #0.95 # The higher will follow more the global path.
  gdist_scale: 0.8                       #0.2
  occdist_scale: 0.3                       #0.01
  publish_cost_grid_pc: false

#move_base
controller_frequency: 20.0 #The robot can move faster when higher.

#global planner 
NavfnROS:
    allow_unknown: true
    visualize_potential: false

Thanks in advance.

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2015-08-10 05:07:43 -0500 asked a question previous scanned map areas disappeared

Currently I am using rtabmap_ros for SLAM and frontier_exploration for exploration. The problems are as followed:

1). The map will not be updated, where there are no obstacles.

2). the previous scanned map areas between the obstacles disappeared.

Thanks in advance.

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