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How to set min and max angular values in DWAPlannerROS?

asked 2019-01-16 06:22:51 -0500

EdwardNur gravatar image

I want to set min and max values that DWAPlannerROS can send to cmd_vel as these values were empirically measured for my robot.

This is how I stated my yaml file:

recovery_behavior_enabled: true
clearing_rotation_allowed: true

  acc_lim_x: 1
  acc_lim_y: 0 
  acc_lim_theta: 1.6
  max_vel_trans: 1.6
  min_vel_trans: 0.8
  max_vel_x: 1.6 
  min_vel_x: 0.8
  max_vel_y: 0.0  
  min_vel_y: 0.0
  min_vel_theta: 10
  max_vel_theta: 11

  holonomic_robot: false

  xy_goal_tolerance: 0.3 
  yaw_goal_tolerance: 0.20 
  latch_xy_goal_tolerance: true 

  sim_time: 4 
  sim_granularity: 0.05
  vx_samples: 5
  vy_samples: 0 
  vth_samples: 5
  controller_frequency: 15

  occdist_scale: 0.01
  oscillation_reset_dist: 0.2

  publish_cost_grid: false
  global_frame_id: odom
  simple_attractor: false

  reset_distance: 4

  prune_plan: true

However, I echoed the /cmd_vel topic and I can see that move_base still sends the values below 10 for angular.z:

  x: 0.0
  y: 0.0
  z: 0.0
  x: 0.0
  y: 0.0
  z: 1.0

Why is it sending these values?

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Which distro are you using?

David Lu gravatar image David Lu  ( 2019-01-16 09:14:58 -0500 )edit

@David Lu I am using Melodic

EdwardNur gravatar image EdwardNur  ( 2019-01-17 01:56:00 -0500 )edit

1 Answer

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answered 2019-02-11 12:25:08 -0500

David Lu gravatar image

I'm not sure this is desirable behavior, but the way that DWA works is that it assumes that you can rotate in either direction at a given max speed. Thus, it will explore trajectories from [-max_vel_theta, max_vel_theta]. For you, 1.0 falls in the range [-11, 11].

Okay, so what does min_vel_theta do? It makes sure your robot is moving in some direction.

However, the above command should fail the check given, so I'm unclear what the problem is.

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Asked: 2019-01-16 06:21:08 -0500

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Last updated: Feb 11 '19