关键词: 开放式数控系统, 动态电压调节, 实时调度, 能耗, 可靠性

Abstract: To solve the problem of high energy consumption and poor reliability of open CNC systems,through optimizing the slack time allocation issues,a set of real-time tasks in the open CNC system was researched to minimize energy consumption while maintaining the reliability of open CNC system.A Low Power and Reliability Based on Sliding Window (LPRSW) algorithm was proposed,which could reduce the system power consumption while ensuring the system reliability.With the different mission scenarios,LPRSW algorithm was divided into LPRSW-H and LPRSW-A algorithm,the former used the highest speed to tolerate faults,while the latter tolerated faults task by dynamic voltage scaling technology.On this basis,a Cooperative Optimal Scheduling Algorithm for Low Power and Reliability Based on Sliding Window (COSALPRSW) algorithm was built,which allocated global shared slack time to backup tasks instead of assigning a backup task to each task,and more slack time was available to reduce system power consumption.In addition,the slack-energy factor was used to rationally allocate slack time to subsequent tasks,which realized the system's reliability and low power consumption co-optimization.Experimental results showed that COSALPRSW algorithm could average 0～31.62% and 0～44.4% energy savings over LPRSW-A and LPRSW-H algorithms respectively.

Key words: open CNC system, dynamic voltage scaling, real-time scheduling, energy consumption, reliability