TAILIEUCHUNG - Robotics 2010 Current and future challenges Part 11

Tham khảo tài liệu 'robotics 2010 current and future challenges part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 340 Robotics 2010 Current and Future Challenges Network Communication Two centralized computers visual positioning and path planner and robots computers runs on the system at the same time. These all computers are connected through a LAN network. Communication among the centralized PCs is performed with the physical ethemet cable while Centralized PCs and robots are connected with wireless network. Data communication between the units are demonstrated in Fig. 12. Testbed Network is based on a publish subscribe architecture. To broadcast messages sender publishes a message to all subscribers and receivers accepts only messages belongs to them according to head-tags of the messages. Performing Low-Level Control Every robots have ability to run own low-level control algorithms. Outer loop control algorithm a nonlinear trajectory controller runs on robots own embedded Linux computers Gumstix . To perform this algorithm reference path is received from Path Planner PC while current configurations is received from Visual Positioning PC via wireless network. According to position and orientation errors trajectory controller evaluates the angular velocities of both two motors that leads the robot to track reference path. Evaluated angular velocities are sent to microcontroller Robostix as reference control variables through UART port. Robostix also counts the pulses of the optic encoders of the motors to evaluate current angular velocities. Received reference angular velocities and current angular velocities are compared and PWM signals are generated via PID controllers as inner control loop and then these PWM signals are sent to motor drivers. These both application is coded in c performs on Gumstix and Robostix. All these control architecture demonstrated in Fig. 14. _ _ _Visua Positjoning_Sytern_ Fig. 14. Control Architecture of the ITUCAL Robotic Testbed 6. Experiments and Simulation Results Physical Hardware Demonstrations To demonstrate the applicability .

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