带检测装置的并联模型最优余度估计

在飞控系统设计中,可靠性问题是首要问题。为达到可靠性要求,余度技术是一种常用选择。但就余度数的选择问题而言,很多设计采用先定性选择,然后在设计基础上再做可靠性计算,这样可能导致工作的反复。其原因是目前很少有文章涉及这个问题的研究。为此,通过对相似余度不可修并联系统这一常用模型的研究,建立了由工作、检测、切换单元构成的模型,并求出了该模型的可靠度计算公式。为了更好地分析模型最优余度数,又进一步抽象出另外一个模型,并给出了其可靠度的计算公式。通过对公式分析,得出了相关推论和结论,给出了数据实例。其推论可用于最优余度数的估计。

Estimation of the Optimal Unit Numbers of Parallel Architecture with the Checking Instrument

While designing the flight control system,the reliability problem should be firstly taken into account.To achieve the reliable goal,the redundancy is usually adopted.As far as the selection of redundancy numbers before the designing is concerned,there exists no paper dedicated to this problem.A reliability model based on similar redundancy parallel system is obtained,which consists of working,monitoring and isolating unit.The theoretical results for reliability accounting problem based on the model are proposed.Two expressions are obtained.Firstly,an expression is intended for calculating the system reliability.Since this expression is too complex for calculating the optimal numbers of parallel units,so the second expression based on an abstract model is proposed.The two expressions are all applied to numerical examples.And some conclusions are deduced.One of them can be used to estimate the optimal numbers of parallel units.