A projection-based method of fault detection for linear discrete time-varying systems

A projection-based method of fault detection for linear discrete time-varying systems
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基于投影的线性离散时变系统故障检测方法

DOI:
10.1080/00207721.2011.625481
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发表时间:
2013-03
影响因子:
4.3
通讯作者:
Maiying Zhong
Maiying Zhong
中科院分区:
计算机科学4区
文献类型:
--
作者:
Maiying Zhong

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本文的目的是利用测量输出估计误差序列的任意线性组合,研制一种残差发生器。首先,提出了基于Gramian矩阵的准则来度量未知输入和故障对残差的影响。然后,残差发生器的设计被配制成一个灵敏度/鲁棒性比最大化问题。它示出的最优解是不唯一的,其中之一可以通过直接应用的测量输出的正交投影,并与援助的创新分析,一个更广义的剩余生成器也得到。此外,对于具有l2-范数有界未知输入或随机噪声序列的线性离散时变系统,证明了所得到的状态空间描述的残差生成器也能提供最优的故障检测滤波器.最后给出了一个数值算例,验证了该方法的有效性.
This article is aimed at the development of a residual generator by making use of an arbitrary linear combination of measurement output estimation error sequence. First, Gramian matrix-based criteria are proposed to measure the influences of an unknown input and a fault on the residual. Then, the design of the residual generator is formulated into a sensitivity/robustness ratio maximisation problem. It is shown that the optimal solution is not unique and one of them can be derived by directly applying an orthogonal projection of the measurement output and, with the aid of an innovation analysis, a more generalised residual generator is also obtained. Furthermore, it is demonstrated that the obtained residual generators in state space description also provide optimal observer-based fault detection filters for the linear discrete time-varying systems subject to l 2-norm bounded unknown inputs or stochastic noise sequences. To show the effectiveness of the proposed method, a numerical example is given.
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