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网络任务周期普遍较长,为了有效暴露网络传输延迟故障,可靠性试验时间往往是其任务周期数倍,否则会造成样本数量少、试验结果置信度低的问题.为此,针对通信网M/M/1排队模型,分析其延迟故障机理,应用相似理论推导建立了及时可靠性相似准则,得到了加速模型,并应用OPNET仿真平台对其进行了验证,分别阐述了数据到达强度不变和变化两种情况下该模型的应用方式,仿真结果表明正常应力作用下的原始网络和短时高应力作用下的相似网络及时可靠性误差小,且加速模型的效用不随故障阈值、应力增加倍数变化.
In order to effectively expose network transmission delay faults, the reliability test time is often several times of the task cycle, otherwise it will result in a small number of samples, low confidence in the test results.Therefore, for the network M / M / 1 queuing model, analyzes the mechanism of delayed failure, and establishes the similarity criterion of timely reliability deduced by using similar theory. The accelerated model is obtained and verified by OPNET simulation platform. The invariant and change of data arrival strength The simulation results show that the error in the real-time reliability of the original network under normal stress and that under short-time high stress is small, and the utility of acceleration model does not change with the failure threshold and stress multiplication.