Browsing by Author "Cheng, Chiz-Chung"

Now showing 1 - 4 of 4

Design of Robustly Asymptotic Stabilizer Using a Time-Varying Sigmoid-Type SMC Scheme
(2008)
Liang, Yew-Wen
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Xu, Sheng-Dong
;
Cheng, Chiz-Chung
;
Liaw, Der-Cherng
;
電控工程研究所
This study presents a class of first-order sliding mode stabilizing control laws, which preserve the advantages of rapid response and robustness from the conventional sliding mode control (SMC) schemes. The presented SMC laws are continuous everywhere so that the chaffering characteristic of the sign-type SMC laws is greatly alleviated. This scheme is also shown to be able to mend the saturation-type SMC's weakness of only achieving uniformly ultimate boundedness performance to an asymptotic stability level.
Robust Guidance Law via Integral-Sliding-Mode Scheme
(2014-05-01)
Liang, Yew-Wen
;
Chen, Chih-Chiang
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Liaw, Der-Cherng
;
Feng, Yang-Ching
;
Cheng, Chiz-Chung
Study and Implementation of a Networking Information Platform for RFID System
(2008)
Song, Chau-Chung
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Hsu, Yin-Chieh
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Cheng, Chiz-Chung
;
Ke, Hong-Lin
;
Liaw, Der-Cherng
RFID system has been treated as one of the important technologies which are enough to influence the evolutions of the global industry in the near future, especially for the supply chain and logistics management. The RFID technology (1)may provide the requirements of the real-time tracking and high precision in the application of logistic systems. In this paper, a networking information platform integrated with RFID system is studied and proposed by using the internet techniques to increase the management capability and to achieve the network routing function of tag data for the enterprise applications. Since one of the most important factors for RFID applications is to construct the integrated and reliable system platform of networking information, this system platform will play one of key technologies for data routing and networking integration in the infrastructure of RFID systems. The main results of this paper are focused on developing the networking integration technologies to monitor the readers and capture the tag EPC data via Web server and the internet, and implementing the interfacing technologies of Savant middleware between RFID reader and database server to mediate the data flow from the clients to the enterprises. In conclusion, the networking information platform for RFID system is developed and evaluated to demonstrate the practical feasibility of RFID applications in this paper.
VSC reliable design with application to spacecraft attitude tracking
(2005)
Liang, Yew-Wen
;
Xu, Sheng-Dong
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Chu, Tzu-Chiang
;
Tsai, Che-Lun
;
Cheng, Chiz-Chung
This study investigates variable structure reliable control issues of nonlinear systems and its applications to spacecraft attitude tracking problems. Both passive and active reliable control laws are proposed using Variable Structure Control (VSC) technique. The passive one must know which group of actuators is allowed to fail, while the active one must accompany a fault detection and diagnosis (FDD) scheme. Both the reliable controllers need not the solution of Hamilton-Jacobi equation or inequality, which are essentials in optimal approaches such as reliable LQR and H-infinity designs. As a matte of fact, the VSC approach is able to relax the computational latency in control law computing. The proposed reliable designs are also applied to spacecraft attitude tracking problems to explain their effectiveness and benefits. Finally, simulation results and comparisons between LQR and VSC reliable designs are given to illustrate the merits of the proposed scheme.