tailieunhanh - Advances in Service Robotics Part 5

Tham khảo tài liệu 'advances in service robotics part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Development of Intelligent Service Robotic System Based on Robot Technology Middleware 93 Fig. 9. Trajectory generation from s sequence of the task level instructions. Dealing with abnormal circumstances When the robot enters an abnormal state all servers and the robot process stop immediately. The typical examples of abnormal circumstances are given as following When the user gives the stop directive by using a PDA or something commanding terminal the task management server gives the stop directive to the robot navigation server. When the navigation server receives the stop directive it sends the cancel instruction to the robot and removes all of the operation level instruction from the pipeline. The navigation server then waits for the next directive from the task management server. When the emergency button of the robot is pushed the robot stops moving and notifies the navigation server. The navigation server then dequeues all of the operation level instructions from the pipeline. The navigation server then waits for the next directive from the task management server. If disconnection of the communication channel between the navigation server and the robot is detected the navigation server and the robot try to recover the connection. If the disconnection is fatal autonomous recovery is impossible and the connection must be fixed manually. iGPS RT functional component We developed iGPS RT functional component in order to enable system integration easier. An indoor Global Positioning System iGPS has been developed to localize the omnidirectional mobile robot. IEEE 1394 cameras are mounted on the ceiling so that the cameras overlook the robot s moving area Hada at el. 2005 . We evaluated accuracy of iGPS by experiments. We selected 24 points distributed in the Lab about 7000 mmx7000 mm area and measured them using iGPS and the maximum value of measurement error is 38 mm. This result verified that the accuracy of iGPS is enough for navigation of mobile .

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