随着实时计算技术日益广泛应用于航空航天、国防及交通运输等安全关键领域,多类型的同步实时、异步实时和非实时网络传输需求给现场网络提出了新的目标和挑战,其中安全关键实时网络的实现方式与调度分析是需要解决的关键问题.在分析、...随着实时计算技术日益广泛应用于航空航天、国防及交通运输等安全关键领域,多类型的同步实时、异步实时和非实时网络传输需求给现场网络提出了新的目标和挑战,其中安全关键实时网络的实现方式与调度分析是需要解决的关键问题.在分析、总结现有COTS网络技术不足之处的基础上,基于事件触发与时间触发,提出了一种基于Ethernet技术的高可靠实时通信协议E&TTE(event- and time-triggered Ethernet),使实时网络不但具有较高的灵活性,而且具有较好的可预测性.为证明E&TTE协议的合理性与可行性,建立了网络调度模型,进行了全局调度分析,并通过具体实例进行了例证.E&TTE协议的提出,满足了安全关键实时网络的多种传输需求,同时也可广泛应用于工业现场控制网络.展开更多
In order to improve dependability of safety critical systems, whose safeguard technologies are researched inthis paper. Firstly, origins and meanings of dependability are expatiated, afterwards, respective meaning of ...In order to improve dependability of safety critical systems, whose safeguard technologies are researched inthis paper. Firstly, origins and meanings of dependability are expatiated, afterwards, respective meaning of and rela-tions among fault、error、failure are analyzed. In succession, how to apply with fault prevention、fault tolerance、faultremoval、fault forecasting to enhance dependability of safety critical systems are expounded concisely by diagrams. Be-cause error detecting is very important in fault tolerant systems, an error detecting technology based on safety kernelis proposed in this paper. Future trends of research in safety critical field are listed at the end.展开更多
文摘随着实时计算技术日益广泛应用于航空航天、国防及交通运输等安全关键领域,多类型的同步实时、异步实时和非实时网络传输需求给现场网络提出了新的目标和挑战,其中安全关键实时网络的实现方式与调度分析是需要解决的关键问题.在分析、总结现有COTS网络技术不足之处的基础上,基于事件触发与时间触发,提出了一种基于Ethernet技术的高可靠实时通信协议E&TTE(event- and time-triggered Ethernet),使实时网络不但具有较高的灵活性,而且具有较好的可预测性.为证明E&TTE协议的合理性与可行性,建立了网络调度模型,进行了全局调度分析,并通过具体实例进行了例证.E&TTE协议的提出,满足了安全关键实时网络的多种传输需求,同时也可广泛应用于工业现场控制网络.
文摘In order to improve dependability of safety critical systems, whose safeguard technologies are researched inthis paper. Firstly, origins and meanings of dependability are expatiated, afterwards, respective meaning of and rela-tions among fault、error、failure are analyzed. In succession, how to apply with fault prevention、fault tolerance、faultremoval、fault forecasting to enhance dependability of safety critical systems are expounded concisely by diagrams. Be-cause error detecting is very important in fault tolerant systems, an error detecting technology based on safety kernelis proposed in this paper. Future trends of research in safety critical field are listed at the end.
