In this paper we develop two time-invariant control laws for a unicycle-type mobile robot. A mobile robot of this type is an example of a system with a nonholonomic constraint. Similarly to the majority of results in the literature thus far, the controllers are based on the robot's kinematic model. They do not directly address realistic factors such as motor dynamics, quantization, sensor noise...

This paper proposes a nonlinear path control for backward driving of a car-like mobile robot pushing trailer with off-axle hitching. The control law is constructed using high-gain design techniques and involves error coordinates expressed which are partially linked to the trailer and invariant properties with respect to the vehicle speed. The stability of the closed-loop system is analyzed usin...

In both robot grasping and robot locomo-tion, we wish to hold objects stably in the presence of gravity. We present a derivation of second-order stability conditions for a supported heavy object, employing the tool of Stratiied Morse Theory. We then demonstrate the application of these general results to the case of objects in the plane.

A n improved otential-based method for robot path planning is devegped by connecting all the local minima and local mazima ofthe potential function defined in fhe configurntion space ofthe robot. The method i s based on the stability theory of dynamical systems. The usefulness ofthe method is demonstrated on a two dimensional piano mover’s problem with three degrees offreedom.

in this paper, a new approach to modify cable tension measuring mechanism is described; furthermore, the constructed boards which amplify load cell output are introduced. this approach has some advantages including of providing feedback for motors, evaluating the robot’s ultimate load carrying capacity, improving the motor control system and estimating the vibrating deflections of the end effec...

How to improve task performance and how to control a robot in extreme environments when just a few sensors can be used to obtain environmental information are two of the problems for disaster response robots (DRRs). Compared with conventional DRRs, multi-arm multi-flipper crawler type robot (MAMFR) have high mobility and task-execution capabilities. Because, crawler robots and quadruped robots ...

Some theoretical and experimental studies have been developed to obtain independent equipment for inspection and maintenace of electric and communication lines, allowing to increase the efficiency of the process and to reduce the risk of accidents with the employees who execute the task. This activity is perfectly adequate for mobile robots because they are capable to move in avoiding the exist...

It is well known that passive walking robot can dynamically walk down with a steady gait by only powered gravity. The dynamics of passive walking has interesting characteristics of stability and bifurcation. Since passive gait is natural motion, investigation of passive walking may lead us to understand human locomotion and design for active walking robot. In this paper, the dynamics of passive...

In this paper, experimental study of robust control for robot manipulator actuated by pneumatic artificial muscles was realized. The experimented controller belonged to the class of variable structure systems which is called nonsingular terminal sliding mode (NTSM). The control approach is based on the time delay estimation method. First, the nonsingular terminal sliding mode control approach w...

In this work the novel teleoperation of real mobile robot is presented. In order to cope with the issue of random time delay which makes system unstable, Fuzzy logic approach has been used to design a stable controller to teleoperate AutoMerlin mobile robot. The fuzzy controller has been designed in such a way that it takes two inputs to give one output. First input is generated by human operat...