TAILIEUCHUNG - Biomimetics Learning from nature Part 10

Tham khảo tài liệu 'biomimetics learning from nature part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 268 Biomimetics Learning from Nature According to the result of gait characters of gecko transition state that the four feet were all at stance phase inserted between the former and latter gait state. At one moment there s just one leg at swing phase and other three legs at stance phase to drive the robot moving forward. The legs at left front right rear right front and left rear direction are at swing phase in turn. The sequence of each state was showed in Fig. 8 just as the motion of trot gait. 1 2 3 4 5 6 7 8 Fig. 8. Gait plan for walking motion In Triangle gait static equilibrium by which the center of gravity was kept in the triangle composed by the feet at stance phase was often used in the control algorithm to keep the robot move stably. To avoid sliding between feet and contact surface the relationship of friction angle and self-locking was widely used for the scheme of force applied to the feet. If the action line of active resultant force applied to the feet lying in the friction cone sliding would be avoided no matter how much the active resultant force was because the selflocking had occurred. Inversely if the action line of the resultant force was out of the friction cone sliding must be occurred no matter how little the force was. And this principle was corresponding with the second and third situation in formula 1 . 6. Design of control system A distributed control system composed of one master - four slavers was designed to control the motion of robot. The master unit which was based on Atmega128L received orders from the host PC by wireless communication and distributed tasks to subsystems. Gait selection was also managed in the master. The subsystem was based on Atmega8L which calculated the degrees each joints motor needed to drive the locomotion of robot leg. The I2C bus was applied to communicate between master and slaves which need only 2 wires and the data rate up to 400 kHz. The whole control diagram was showed in Fig. 9. A Biomimetic Study

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