tailieunhanh - Innovations in Robot Mobility and Control - Srikanta Patnaik et al (Eds) Part 11

Tham khảo tài liệu 'innovations in robot mobility and control - srikanta patnaik et al (eds) part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5 Intelligent Neurofuzzy Control of Robotic Gripper 191 patern of acceleration as before. Again this controller is able to mange excellently the negative acceleration and reduce slippage for the positive acceleration. The neurofuzzy hierarchical system was not only able to reduce the number of rules but also give a slight improvement in the system performance. Slip rate Acceleration Applied force Desired end effector acceleration Fig. Hierarchical framework to improve the performance of the end effector controlling its maximum acceleration . Hierarchical Approach with Acceleration Control As end effector acceleration can induce slippage it is worth considering controlling the end effector acceleration. Object slippage can be reduced if more force is applied to the object. However there is a limit to the force that the gripper can apply because the object can be crushed if large force is applied the object can slip if the gripper cannot apply more force because of mechanical limits. As result there is also a limit in the end effector acceleration to ensure a stable gripping. Accordingly a hierarchical framework to limit the maximum end effector acceleration is proposed as shown in Figure . This design features two neurofuzzy controllers. Neurofuzzy controller 1 is the neurofuzzy hierarchical controller described in Section . Neuro-fuzzy controller 2 is responsible for calculating the maximum end effector acceleration that the gripper can exert yet still guarantee stable gripping. The output set of Neurofuzzy controller 2 is the maximum absolute acceleration j al . The absolute value of the maximum acceleration is 192 . Domínguez-López et al. used to have a more transparent network. It has four memberships Z S M and L. The output of the limiter . the suggested end effector acceleration as as is given by 1 max . ad ssn ad where ad is the desired end effector vertical acceleration. This value comes from another level of the robot controller for

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