tailieunhanh - Cutting Edge Robotics Part 11

Tham khảo tài liệu 'cutting edge robotics part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Intelligent Robot Systems based on PDA for Home Automation Systems in Ubiquitous 291 Through equation 4 5 and 6 we could estimate present robot position and orientation as shown in equation 7 8 and 9 . aOx k 1 aOx k Ễ Ễl cos Ok S 7 a k 1 Oy k 2 sin O- k S 8 k 1 k Se. 9 Although users can control the PBMoRo System using a remote joystick it is also able to operate automatically. If people input their desired goal position the robot can navigate in a home environment freely by itself. To accomplish these kinds of jobs a path planner should make the shortest path and avoid obstacles while a motion generator establishes suitable velocities for the two wheels. However if the robot faces obstacles which don t exist on the map collision and slippage problems occur simultaneously. In this case the robot and home appliances might be damaged and systems could break out. Therefore the robot should be able to avoid obstacles that are not on the map. In these respects we suggest an obstacle avoidance algorithm for the PBMoRo System. The angular coordination can be divided into 4 sectors depending on the angle of the robot as illustrated in Fig. 12. Fig. 12. Quadrant from view of robot. If there are some obstacles near the robot ultrasonic range sensors can detect them and transfer their data to a PDA Beom H. R. and Cho H. S 2000 . The PDA recognizes locations of obstacles and makes a safe path to prevent collision. These processes are shown in Fig. 13. 292 Cutting Edge Robotics 2010 Fig. 13. Obstacle avoidance algorithm proposed by the PBMoRo System. Intelligent Robot Systems based on PDA for Home Automation Systems in Ubiquitous 293 Because the PDA has a lower performance than the SBC we exploited half of the ultrasonic sensor data even filed and odd filed. By using this method we could make an obstacle detection algorithm in real time. Fig. 13 illustrates even filed data processing using a zero index two index and four index sensors. Due to developing map building algorithms

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