Obstacle avoidance control of the manipulator – KUKA robots

Create Date: 2024-8-30 12:03:23|Source: KUKA

The kinematic redundancy of freedom of the manipulator means that the manipulator has more degrees of freedom than is required at the end of the manipulator. Kinematic manipulators with redundant degrees of freedom have better functions than manipulators with non-redundant degrees of freedom. For example, a manipulator with non-redundant degrees of freedom is subject to very large constraints when there are obstacles in the external environment, and a manipulator with kinematic redundant degrees of freedom can complete the task well. Due to the existence of singularities, the working space of the manipulator with non-redundant degrees of freedom is constrained, and the manipulator with kinematic redundant degrees of freedom can handle this kind of problem well.

                                    Obstacle avoidance control of the manipulator – KUKA robots

The manipulator with redundant degrees of freedom can optimize various functional indicators in motion control, such as: constraining the joint viewpoint, minimizing the angular velocity, angular acceleration, joint torque, energy, etc. of the manipulator. Therefore, manipulators with kinematic redundant degrees of freedom have been widely used, during which obstacle evasion is a very important application.

Generally speaking, there are two main ways to avoid obstacles in the manipulator. One method is to carry out path planning at the high level, so that the end of the manipulator can avoid obstacles through offline path planning. This method can ensure the global optimization of the robot, but it cannot complete online control. Another method is to avoid obstacles online through the manipulator's controller. Regarding the manipulation of online obstacle avoidance, many scholars have proposed their own solutions. Many algorithms are based on the pseudo-inverse matrix method. The obstacle avoidance control of the manipulator can make the manipulator avoid obstacles in the working process and give full play to the superior function of the manipulator with redundant degrees of freedom.
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