Networked Control System is the focus of current research in control field, and the use of a shared network introduces new challenges, therefore, it is significant to research scheduling algorithms for improving the c...
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ISBN:
(纸本)9783037853191
Networked Control System is the focus of current research in control field, and the use of a shared network introduces new challenges, therefore, it is significant to research scheduling algorithms for improving the control and schedule performance of NCS. In the paper, according to the challenges existing in scheduling algorithms, a new scheduling algorithm called Switch scheduling is proposed, and the calculation method of switching conditions is also given. In the proposed algorithm, network-induced delay and network utilization are considered to satisfy the different network condition with appropriate scheduling algorithm. The proposed algorithm improves the network utilization and the efficiency of data transmission, and guarantees the system stability. Finally, a simulation example is conducted to validate the feasibility and superiority of the proposed switch scheduling.
Schedulability test is a key problem for real-time scheduling algorithms. Since first introduced by Liu and Layland in 1973, the rm (rate monotonic) algorithm and its extended ones have been widely used in many fields...
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Schedulability test is a key problem for real-time scheduling algorithms. Since first introduced by Liu and Layland in 1973, the rm (rate monotonic) algorithm and its extended ones have been widely used in many fields such as digital control, command and control, signal processing, and communication systems. A lot of work has been done to investigate their Schedulability, and present their corresponding Schedulability tests. As the implementation of real-time systems requires the consideration of the practical issues such as the number of tasks, the period of each task, and scheduling costs, a systematic performance analysis platform is required to give them a thorough evaluation. In this paper, all Schedulability tests of rm and its extended ones are summarized, a platform is developed to test and compare their performance, and a thorough evaluation and comparison is made of the Schedulability tests through testing. These results and analysis are very beneficial for selecting appropriate algorithms in real-time system design and implementation.
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