Copyright 2001. Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Robotic Locomotion.

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Presentation transcript:

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Robotic Locomotion

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Design Tradeoffs with Mobility Configurations Maneuverability Controllability Traction Climbing ability Stability Efficiency Maintenance Environmental impact Navigational considerations

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Differential Drive Where D represents the arc length of the center of the robot from start to finish of the movement. Pictures from “Navigating Mobile Robots: Systems and Techniques” Borenstein, J.

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Differential Drive (continued) Advantages: Cheap to build Easy to implement Simple design Disadvantages: Difficult straight line motion

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Problem with Differential Drive: Knobbie Tires Changing diameter makes for uncertainty in dead-reckoning error Pictures from “Navigating Mobile Robots: Systems and Techniques” Borenstein, J.

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Skid Steering Advantages: Simple drive system Disadvantages: Slippage and poor odometry results Requires a large amount of power to turn

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Synchro Drive Advantages: Separate motors for translation and rotation makes control easier Straight-line motion is guaranteed mechanically Disadvantages: Complex design and implementation Pictures from “Navigating Mobile Robots: Systems and Techniques” Borenstein, J.

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Distributed Actuator Arrays: Virtual Vehicle Modular Distributed Manipulator System Employs use of Omni Wheels

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Omni Wheels Advantages: Allows complicated motions Disadvantages: No mechanical constraints to require straight-line motion Complicated implementation Pictures from “Navigating Mobile Robots: Systems and Techniques” Borenstein, J.

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Tricycle Advantages: No sliding Disadvantages: Non-holonomic planning required Pictures from “Navigating Mobile Robots: Systems and Techniques” Borenstein, J.

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Ackerman Steering Advantages: Simple to implement Simple 4 bar linkage controls front wheels Disadvantages: Non-holonomic planning required Pictures from “Navigating Mobile Robots: Systems and Techniques” Borenstein, J.

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Articulated Drive: Nomad Advantages: Simple to implement except for turning mechanism Disadvantages: Non-holonomic planning is required

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Framewalker: Jim2 Advantages: Separate actuation of translation and rotation Straight-line motion is guaranteed mechanically Disadvantages: Complex design and implementation Translation and rotation are excusive

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Snake Robots Advantages: Many applications Hyper-redundant Disadvantages: Complex control and planning

Copyright Howie Choset, Renata Melamud, Al Costa, Vincent Leeshue, Sean Piper, Ryan Dejonckheere. All rights reserved. Legged Robots Advantages: Can traverse any terrain a human can Disadvantages: Large number of degrees of freedom Maintaining stability is complicated Are legs better than wheels?