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Robot Control

  • Portwings: Decoding the physics of flapping flight
    Abstract
    In this seminar an overview will be given of the ERC AdG PortWings project and its achievements. The overview will first describe the initial goal and the context in which the project came to existence, and then will give attention to the various aspects of...
  • Motion Control of Redundant Robots with Generalised Inequality Constraints
    We present an improved version of the Saturation in the Null Space (SNS) algorithm for redundancy resolution at the velocity level. In addition to hard bounds on joint space motion, we consider also Cartesian box constraints that cannot be violated at any time. The modified algorithm combines all...
  • Detection and isolation of actuator faults and collisions for a flexible robot arm
    This paper presents a unified approach to detection and isolation of both actuator faults and unexpected collisions for a two-link robot with a flexible forearm. The proposed approach is sensorless, i.e., no dedicated exteroceptive sensors are considered, and is based on the design of residuals to...
  • Reduced-Order Observer Design for Robot Manipulators
    This paper investigates the design of reduced-order observers for robot manipulators. Observer stability conditions are obtained based on a Lyapunov analysis. The proposed observer is enhanced with a hybrid scheme that may adjust the gains to cope with possible unbounded velocities of the robot...
  • Human-robot coexistence and interaction in open industrial cells
    Recent research results on human-robot interaction and collaborative robotics are leaving behind the traditional paradigm of robots living in a separated space inside safety cages, allowing humans and robot to work together for completing an increasing number of complex industrial tasks. In this...
  • Linear-quadratic optimal boundary control of a one-link flexible arm
    A linear-quadratic optimal control problem is considered for the infinite-dimensional model of a one-link flexible arm. Two boundary inputs are assumed to be available, namely the joint torque at the link base and a transverse force at the tip of the link. The problem is formulated and solved using...
  • A Nonlinear Observer for a Flexible Robot Arm and its Use in Fault and Collision Detection
    A nonlinear observer is presented for the estimation of the joint velocities and of the deformation modes and their rates for a two-link flexible robot arm, using only motor encoders and a tip position sensor. The state observer can be used then for trajectory tracking control. By monitoring the...
  • Task Priority Matrix at the Acceleration Level: Collision Avoidance Under Relaxed Constraints
    We propose a new approach for executing the main Cartesian tasks assigned to a redundant robot while guaranteeing whole-body collision avoidance. The robot degrees of freedom are fully utilized by introducing relaxed constraints in the definition of operational and collision...
  • Human-robot contactless collaboration with mixed reality interface
    A control system based on multiple sensors is proposed for the safe collaboration of a robot with a human. New constrained and contactless human-robot coordinated motion tasks are defined to control the robot end-effector so as to maintain a desired relative position to the human head while...
  • Exploiting Robot Redundancy for Online Learning and Control
    Accurate trajectory tracking in the task space is critical in many robotics applications. Model-based robot controllers are able to ensure very good tracking but lose effectiveness in the presence of model uncertainties. On the other hand, online learning-based control laws can handle poor dynamic...
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