Details

Autor(en) / Beteiligte

• Mahmoodi, L.
• Aliyari Shoorehdeli, M.

Titel

Comments on "A Novel Fault Diagnostics and Prediction Scheme Using a Nonlinear Observer With Artificial Immune System as an Online Approximator"

Ist Teil von

• IEEE transactions on control systems technology, 2017-11, Vol.25 (6), p.2243-2246

Ort / Verlag

IEEE

Erscheinungsjahr

2017

Quelle

IEL

Beschreibungen/Notizen

• In this letter, we point out that the asymptotic convergence, claimed in <xref ref-type="theorem" rid="theorem2">Theorem 2 , of the output residual and parameter estimation error after fault occurrence are guaranteed by the performance of the fault diagnosis observer is not quite right. The proof of the asymptotic convergence is contributed by Lemma 1 and negative semidefiniteness of the first difference of Lyapunov candidate function. Here, it is shown that utilizing Lemma 1 yields in some disputed points in the proof of <xref ref-type="theorem" rid="theorem2">Theorem 2 . On the other hand, the proof of <xref ref-type="theorem" rid="theorem2">Theorem 2 is not mathematically correct. Therefore, the guarantee of the asymptotic convergence mentioned for FD observer in <xref ref-type="theorem" rid="theorem2">Theorem 2 is not realizable.