A sliding mode approach for active fault tolerant control and estimation

该方案将考虑在“现役飞机”中使用滑模概念进行主动容错控制和估计。滑模控制器对一类不确定性具有很强的鲁棒性，并已被证明能够针对执行器故障提供固有的容错控制。滑模观测器能够通过对所谓的“等效输出误差注入”进行适当的缩放和滤波来重构动态系统中的不可测信号。这是滑模观测器的一个独特性质，它源于这样一个事实，即滑动运动的引入迫使观测器的输出精确跟踪对象的测量。以前的工作已经研究了滑模思想在具有“常规”操纵面的民用飞机中用于容错控制的潜力。在主动控制环境中，一个关键挑战将是将这些想法应用于不那么传统的环境中，在这种环境中，存在着“非传统”执行器或传感器阵列的激增。在项目期间将制定一个问题公式，以使要重建的信号代表对飞机系统产生影响的不可测量或不可测量的外部量--无论是外部(环境条件)还是内部(与机身本身相关)。

This proposal will consider the use of sliding mode concepts for active fault tolerant control and estimation in an 'active aircraft'. Sliding mode controllers have strong robustness properties to a certain class of uncertainty and have been shown to provide inherent fault tolerant control with respect to actuator faults. Sliding mode observers have an ability to reconstruct un-measurable signals within a dynamic system by appropriate scaling and filtering of the so-called 'equivalent output error injection'. This is a unique property of sliding mode observers which emanates from the fact that the introduction of a sliding motion forces the outputs of the observer to exactly track the plant measurements. Previous work has investigated the potential of sliding mode ideas for fault tolerant control in a civil aircraft with 'conventional' control surfaces. In an active control environment a key challenge will be to apply these ideas in a less traditional setting in which there is a proliferation of 'unconventional' actuators or sensor arrays. A problem formulation will be developed during the project so that the signals to be reconstructed represent unmeasured or unmeasurable external quantities which impact on the aircraft system - either externally (environmental conditions) or internally (associated with the airframe itself).