Hierarchical Reliability Modelling and Analysis of Life Support System of Fighter Aircraft

Anubhav Tandon, Vidhya Bhushan Verma, S. Chaturvedi
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Abstract

The paper proposes a hierarchical reliability modelling and assessment approach for a life support system (LSS) that provides oxygen to the pilot and is employed in a combat aircraft. The system has the primary function of generating oxygen onboard, and it has a backup gaseous oxygen tank as redundancy. An emergency oxygen bottle is also part of the ejection seat for emergency use. Both backup oxygen and emergency oxygen have a fixed capacity and a fixed duration of oxygen supply. Therefore, it is crucial to assess the reliability of the LSS to ensure its safety and effectiveness of this LSS during a mission by the combat aircraft. The proposed reliability model of LSS is developed as a two-level hierarchical model, that captures the inherent randomness in the operation of the system. At the lowest level of the hierarchy, Markov chains are used to model the events that may lead to the failure of the LSS. The events include the failure of individual components, the depletion of backup oxygen, and the depletion of emergency oxygen. The Markov chains consider the interactions between individual components and events during the mission profile. At the top level of the hierarchy, a fault tree is used to model the interactions between various events during the mission profile. The fault tree considers the interactions between individual events and the effects of redundancy on the reliability of the LSS. The results of the Markov chains at the lower level are exported to the higher level modelled via fault tree to find the overall system reliability. The reliability model is further extended to incorporate the deterministic nature of the LSS due to the fixed capacity of the backup tank and emergency bottle. The work addresses the modelling of six different scenarios of LSS operations. The modelling of these scenarios is achieved using Semi-Markov Processes (SMP), which allow the state holding time to be a general distribution.
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战斗机生命保障系统分层可靠性建模与分析
本文提出了一种用于作战飞机的为飞行员提供氧气的生命支持系统(LSS)的分层可靠性建模和评估方法。该系统的主要功能是在船上产生氧气,并有一个备用气态氧气罐作为冗余。紧急氧气瓶也是弹射座椅的一部分,用于紧急使用。备用氧气和应急氧气都有固定的容量和固定的氧气供应时间。因此,评估LSS的可靠性至关重要,以确保其在作战飞机执行任务期间的安全性和有效性。所提出的LSS可靠性模型是一个两级层次模型,它捕捉了系统运行中固有的随机性。在层次结构的最低级别,马尔可夫链用于对可能导致LSS故障的事件进行建模。这些事件包括单个部件的故障、备用氧气的耗尽和应急氧气的耗尽。马尔可夫链考虑了任务剖面期间单个组件和事件之间的相互作用。在层次结构的顶层,故障树用于对任务概要中各种事件之间的交互进行建模。故障树考虑了单个事件之间的相互作用以及冗余对LSS可靠性的影响。通过故障树将较低级别的马尔可夫链的结果导出到较高级别,以找到整个系统的可靠性。由于备用罐和应急瓶的容量固定,可靠性模型进一步扩展,以纳入LSS的确定性。这项工作涉及LSS行动的六种不同情景的建模。这些场景的建模是使用半马尔可夫过程(SMP)实现的,该过程允许状态保持时间为一般分布。
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来源期刊
CiteScore
3.80
自引率
6.20%
发文量
57
审稿时长
20 weeks
期刊介绍: IJMEMS is a peer reviewed international journal aiming on both the theoretical and practical aspects of mathematical, engineering and management sciences. The original, not-previously published, research manuscripts on topics such as the following (but not limited to) will be considered for publication: *Mathematical Sciences- applied mathematics and allied fields, operations research, mathematical statistics. *Engineering Sciences- computer science engineering, mechanical engineering, information technology engineering, civil engineering, aeronautical engineering, industrial engineering, systems engineering, reliability engineering, production engineering. *Management Sciences- engineering management, risk management, business models, supply chain management.
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