Ask Your Question

Robot cant avoid obstacal

asked 2017-02-09 16:30:25 -0600

ghaith gravatar image

updated 2017-02-10 15:35:33 -0600

hi , i am trying to apply the navigation stack on my robot every thing work great ; from building the map to moving on the map. When i apply the path planning it find the gold without any problem if there is no additional obstacle ( this mean no new obstacle) it will move to the goal without any problem. But if i add any new obstacle dynamic or static it will not avoid it and no inflation layer occur on this obstacle. I don't know why this happen ? so if there is no inflation layer on the obstacle it will not avoid it.But at the same time the inflation layer is worked good in the original obstacle, is there any way to make the inflation layer dynamic? for the information, i am using ROS indigo and i will add all my parameter for u hopeful this will help to solve my problem:

edit : solved the problem was between the static transformation between base link and camera , it was 0 for z plane so the robot assume that the camera is in the same plane as the base link so no avoiding will occur in this case sorry for the stupide question.

first cost map common parameter:

    robot_radius: 0.24

obstacle_range: 2.5
raytrace_range: 3.0
#max_obstacle_height: 0.6

observation_sources: scan
  data_type: LaserScan
  topic: scan
  marking: true
  clearing: true
  min_obstacle_height: 0.1
#  max_obstacle_height: 0.35

map_type: costmap
#  enabled: true
  #origin_z: 0.0
  #z_resolution: 0.2
  #z_voxels: 2
  #unknown_threshold: 15
  #mark_threshold: 0
  #combination_method: 1
#  track_unknown_space: true #true needed for disabling global path planning through unknown space

#cost_scaling_factor and inflation_radius were now moved to the inflation_layer ns
#  enabled: true
#  cost_scaling_factor: 10.0 # exponential rate at which the obstacle cost drops off (default: 10)
inflation_radius: 0.5 # max. distance from an obstacle at which costs are incurred for planning paths.

#enabled: true

base local planner:

  max_vel_x: 0.3
  min_vel_x: 0.1
  max_vel_y: 0.0
  min_vel_y: 0.0
  max_vel_theta: 0.5
  min_vel_theta: -0.5
  min_in_place_vel_theta: 0.4
  escape_vel: -0.1

  acc_lim_theta: 0.4
  acc_lim_x: 1.0
  acc_lim_y: 0.0

  yaw_goal_tolerance: 0.2
  xy_goal_tolerance: 0.2

  sim_time: 3.0
  vx_samples: 20
  vtheta_samples: 30

  holonomic_robot: false

  meter_scoring: false
  dwa: false
  pdist_scale: 1.0
  gdist_scale: 0.8
  occdist_scale: 0.01
  publish_cost_grid_pc: true

global cost map:

  global_frame: /map
  robot_base_frame: /base_link
  update_frequency: 1.0
  publish_frequency: 0.5
  static_map: true

  transform_tolerance: 0.5

global planner param:

GlobalPlanner: # Also see:
  old_navfn_behavior: false # Exactly mirror behavior of navfn, use defaults for other boolean parameters, default false
  use_quadratic: true # Use the quadratic approximation of the potential. Otherwise, use a simpler calculation, default true
  use_dijkstra: true # Use dijkstra's algorithm. Otherwise, A*, default true
  use_grid_path: false # Create a path that follows the grid boundaries. Otherwise, use a gradient descent method, default false
  allow_unknown: true # Allow planner to plan through unknown space, default true
  #Needs to have track_unknown_space: true in the obstacle / voxel layer (in costmap_commons_param) to work
  planner_window_x: 0.0 # default 0.0 ...
edit retag flag offensive close merge delete


If you found the solution yourself, could you please answer your own question?

If this is a duplicate (and the answer is provided in some other question), then please provide a link to that other question.

gvdhoorn gravatar image gvdhoorn  ( 2017-02-12 07:49:59 -0600 )edit

i add an edit for the solution in the same question so every one can see the solution I cant reopen the question again to answer my question sorry

ghaith gravatar image ghaith  ( 2017-02-12 12:05:01 -0600 )edit

Just re-opened it for you.

gvdhoorn gravatar image gvdhoorn  ( 2017-02-12 12:07:25 -0600 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2017-02-16 05:54:45 -0600

ghaith gravatar image

Hi I solve it by my self the problem was between the static transformation between base link and camera , it was 0 for z plane so the robot assume that the camera is in the same plane as the base link so no avoiding will occur. After I adjusted it every thing work very good.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools



Asked: 2017-02-09 16:30:25 -0600

Seen: 306 times

Last updated: Feb 16 '17