The robot manipulator joint actuator dynamics and the payload variation are major factors that severely affect the overall dynamics and hence the tracking performance of the direct drives manipulator. This paper proposes a robust and computationally simple approach aimed at compensating the tracking error due to model uncertainty, actuator dynamics, and payload variation for the inverse dynamic...

as a robot could be stable statically standing on three or more legs, a six legged walking robot can be highly flexible in movements and perform different missions without dealing with serious kinematic and dynamic problems. an experimental six legged walking robot with 18 degrees of freedom is studied and built in this paper. the kinematic and gait analysis formulations are demonstrated by an e...

We present a control framework for achieving encirclement of a 3D target using a multi-robot system. Three variations of a basic control strategy are proposed for different versions of the encirclement problem, and their effectiveness is formally established. An extension ensuring maintenance of a safe inter-robot distance is also discussed. The proposed framework is fully decentralized and onl...

This paper proposes a method for trajectory planning and control of a mobile robot for application in picture drawing from images. The robot is an accurate differential drive mobile robot platform controlled by a field-programmable-gate-array (FPGA) controller. By not locating the tip of the pen at the middle between two wheels, we are able to construct an omnidirectional mobile platform, thus ...

This chapter presents an image-based Proportional Integral Derivative (PID) controller for a redundant overactuated planar parallel robot; the control objective is to drive the robot end effector to a desired constant reference position. The main feature of the proposed approach is the use of a vision system for obtaining the end effector position. This approach precludes the use of the robot f...

Two gamma-radiation distribution field measurement experiments are described in the paper. Because of principally dangerous nature of gamma-radiation, the idea was to extensively use robotic systems and automation to minimize human exposure to radiation. The experiment setup as well as Orpheus robotic system are described. Algorithm to autonomously navigate the robot based on RTK GNSS in predef...

This work studies the interaction of the nonholonomic and visibility constraints of a robot that has to maintain visibility of a static landmark. The robot is a differential drive system and has a sensor with limited field of view. We determine the necessary and sufficient conditions for the existence of a path for our system to be able to maintain landmark visibility in the presence of obstacl...

The following paper presents the ROS-I interface developed to control Comau manipulators. Initially, the Comau controller allowed users to command a real robot thanks to motion primitives formulated through a Comau motion planning library. Now, either a ROS or a non ROS -compliant platform can move either a real or a virtual Comau robot using any motion planning library. Comau modules have been...

We present a framework for representing scenarios with complex object interactions, in which a robot cannot directly interact with the object it wishes to control, but must instead do so via intermediate objects. For example, a robot learning to drive a car can only indirectly change its pose, by rotating the steering wheel. We formalize such complex interactions as chains of Markov decision pr...