عنوان مقاله [English]
In this paper, a novel technique is presented for inverse kinematics and motion planning of a redundant manipulator robot in an environment with unknown obstaclesusing a fuzzy controlling is presented. Kinematic redundancy occurs when amanipulator possesses more degrees of freedom than the minimum number requiredfor executing a given task. Redundancy enhances the manipulator dexterity andflexibility which allows the redundant robot to move faster and safer in theenvironment without colliding with obstacles. In order to avoid colliding withobstacles, a high degree of freedom robot was used. Due to high degree of freedom, inverse kinematics of redundant robots is very difficult, thus a general approach to motion planning of a redundant manipulator robot is very practical and valuable. It was inspired that a human arm is capable of avoiding colliding obstacles. Therefore, in this paper, direct control of end effector position of manipulator using a multi- behavior fuzzy controller, inspired by behavior of human arm, makes a practical method to the navigation of redundant manipulator robots. In this method, the control of every link is independent from the degree of freedom of robot; the number of input and output signals are constant. Fuzzy controller system used in this research is a combination of three fuzzy controllers, which deals with a separate behavior of redundant robot. The mainobjective is still to avoid the obstacles and flexion and extension of arm. The final behavior of redundant robot is a combination of these behaviors. For illustration, some simulation results of redundant planar manipulator moving in an unknown environment is presented. Results were prepared by a Simulink model containing fuzzy control subsystems, sensor, actuators, and obstacles. The simulation and experimental results of three and six link planar manipulators in environment with one obstacle and without obstacle show a good and promising performance of the robot.