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首页> 外文会议>Reliability and Maintainability Symposium (RAMS), 2012 Proceedings - Annual >Automated design of reconfiguration strategies increases reliability
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Automated design of reconfiguration strategies increases reliability

机译：自动化的重新配置策略设计提高了可靠性

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Modern reliability engineering is challenged by tightening reliability and safety norms on the one hand and increasing flexibility and structural complexity of technical systems on the other. A “conventional” approach in reliability engineering offers plenty of methods for system analysis which can serve as a basis for altering the system design in order to guarantee higher reliability. Although this pattern is effective, it is also expensive (the later it is employed in the design process, the more expensive it will be) and time-consuming. This paper suggests a method that can be used along with the above-described “conventional” approach in order to increase the reliability of a class of mechatronic systems. The method involves the development of a fault-tolerant control system (FTCS). The controller-design process is more flexible than that of system design, and so a control system can be converted into an FTCS at any stage of the system design (even after it has been completed, as was the case with the example described below), thus consuming far less time and expenses. The basic idea behind the method of constructing FTCS is to switch the system after each fault of a component into a control strategy that will not need the faulty component and therefore cannot influence the system performance. In order to realize this task, FTCS consists of a fault detection unit, fault-driven reconfiguration chart (the state chart guiding a reconfiguration of the system after each fault of a component) and a set of emergency controllers (i.e., controllers to be activated after faults have been detected in the system to prevent fault propagation). Our paper presents an algorithm for constructing the fault-driven reconfiguration chart based on the fault tree analysis of emergency strategies. It also contains as an example an implementation of the approach outlined above. An active suspension system for the all-terrain vehicle “DINGO&x20- ;D; was employed as a basic system. It has been shown that the concept of fault-driven reconfiguration can increase the reliability of the suspension and thus influence the driving safety. The reconfiguration chart was then analyzed in order to assess the impact of the properties of the FTCS (for example, fault detection probability) on the reliability of the overall system.
机译：现代可靠性工程面临挑战，一方面要严格可靠性和安全性准则，另一方面要提高技术系统的灵活性和结构复杂性。可靠性工程中的“常规”方法提供了许多系统分析方法，这些方法可作为更改系统设计以确保更高可靠性的基础。尽管这种模式很有效，但它也很昂贵（在设计过程中采用的时间越晚，则越昂贵）且耗时。本文提出了一种可以与上述“常规”方法一起使用的方法，以提高一类机电系统的可靠性。该方法涉及容错控制系统（FTCS）的开发。控制器设计过程比系统设计过程更加灵活，因此控制系统可以在系统设计的任何阶段（即使完成后也可以转换为FTCS，如以下示例所示） ，从而节省了更少的时间和费用。构造FTCS的方法背后的基本思想是，在组件出现每个故障之后将系统切换到不需要该有故障组件的控制策略，因此不会影响系统性能。为了实现此任务，FTCS包括故障检测单元，故障驱动的重新配置图（状态图，指导在组件发生每个故障后重新配置系统）和一组紧急控制器（即要激活的控制器）在系统中检测到故障以防止故障传播之后）。本文提出了一种基于应急策略故障树分析的故障驱动重配置图构造算法。作为示例，它还包含上述方法的实现。适用于全地形车“ DINGO＆x20-; D;被用作基本系统。已经表明，故障驱动的重新配置的概念可以提高悬架的可靠性，从而影响行驶安全性。然后分析重新配置图，以评估FTCS的属性（例如，故障检测概率）对整个系统可靠性的影响。

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