Behavior-based mobile manipulation for drum sampling

This paper describes an implementation of a behavior-based mobile manipulator capable of autonomously transferring a sample from one drum to a second in unstructured environments. A major contribution of the project was the coherent integration of the arm and base as a cohesive unit, and not just a mobile base with an arm attached. The support for smooth simultaneous operation of all joints on the vehicle facilitated biologically plausible motions, such as arm preshaping. The behavior-based controller used a pseudo-force model, where behaviors add forces and torques to joints and limbs resulting in coordinated motion. The vehicle Jacobian is used to convert the pseudo-forces into joint torques and a pseudo-damping model converts the joint torques into joint velocities. This process allows rapid control of the manipulator without the use of inverse kinematics. A drum sampling task is presented where the vehicle demonstrates how a sample of material could be moved from one drum to another, illustrating the efficacy of the solution.

Authors

• Douglas C. MacKenzie
• Ronald C. Arkin

Keywords

• Sampling methods
• Manipulators
• Vehicles
• Mobile robots
• Motion control
• Robot vision systems
• Cameras
• Wrist
• Biological system modeling
• Service robots
• Mobile Manipulator
• Fabric Samples
• Joint Torque
• Joint Velocity
• Sequence Detection
• Visual Search
• Static Equilibrium
• Hough Transform
• Arm Motion
• Open Hole
• Ellipse Fitting
• Robot Base
• Perception Module