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RISS 인기검색어
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- 저자 : Fenxi Yao (검색결과 2 건)
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Mobile Anchor Assisted Distributed Localization for Wireless Sensor Networks with Holes
Longfei Wen,Fenxi Yao,Guang Ye,Lingguo Cui,Baihai Zhang 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Location information of sensor node is very significant in wireless sensor networks (WSNs). Currently, localization approaches can be divided into two categories: distributed and centralized. Due to the requirement of the flexibility and real-time performance, distributed algorithms reveal huge advantage. DV-Hop is a classical distributed one which works by transforming the distances to all anchors from hops to units of length measurement (e.g., meters, feet) using the average size of a hop. In anisotropic networks with holes, the performance of DV-Hop degrades because of the imprecise estimation of the hop count and average size of a hop. In this work, a mobile anchor assisted distributed localization method (MAA-DL) is proposed which can decrease the impact of holes in sensor networks. The proposed method uses some mobile anchors to mark some nodes on the boundary of the holes to refine the distances to the anchors. Simulation results show that the proposed algorithm is adapted to anisotropic networks in different situations when varying the node scale and anchor scale. The localization error can be largely decreased using MAA-DL in networks with convex or concave holes.
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Sliding Mode Control with Friction Observer and Load Observer of PMSM
Linyuan Chai,Fenxi Yao 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Aiming at the problems of friction and the load torque disturbance in the servo system,the Dahl friction model and the LuGre friction commonly used in servo system were analyzed and compared to discuss a modified Dahl model which could describe the phenomenon of friction well. Then based on the method of the Lyapunov stability analysis, an algorithm of friction compensation with modified Dahl model was designed, which was used to control the current loop. To observe the changes of load torque, load torque observer was designed, the result of the observation was feedback to the speed control loop and the speed loop was controlled by sliding mode control method (SMC). The results of simulation and experiment indicate that the precision of the system and the effects of load mutation rate have been improved.
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