Design of robust controllers for uncertain non-minimum phase and unstable plants with the Quantitative Feedback Theory (QFT) is addressed in this paper. Several counterexamples including non-minimum phase plants and unstable plants are given to illustrate the errors in Horowitz and Sidi method 7, 5]. It is shown that the stability requirement of the new nominal plants is misused or ignored in t...

In this paper, iterative learning control using output data, which are more advanced than the relative degree of the system, is being investigated. It is known that the output error can be made zero with the conventional iterative learning control in which the input is updated with the output data advanced by the relative degree. However, the input can become too large for nonminimum phase syst...

Conditions for the existence of positive stable realizations with system Metzler matrices for fractional continuous-time linear systems are established. A procedure based on the Gilbert method for computation of positive stable realizations of proper transfer matrices is proposed. It is shown that linear minimum-phase systems with real negative poles and zeros always have positive stable realiz...

The tube model, realized by lattice filters in discrete time, can be used to describe the propagation of plane sound waves through the vocal tract. The tube model which is treated in this contribution contains two prescribed terminations. One for the lip opening and one for the constriction at the glottis. These two terminations are frequency dependent and the lip termination must be adapted to...

Abstract— A fundamental problem for control engineers is that of output tracking. The earlier approaches are restricted to certain classes of systems precluding the presence of zeros from certain regions in the complex plane, and do not reasonably take into account process and measurement noise. A technique to achieve output tracking applicable to non-minimum phase linear systems is presented w...

Let H(z) = 1k=0 Hkz k be a q p rational causal minimum phase transfer function, and let (Rn)n2 be the autocovariance sequence associated to the spectral density H(z)H (z ): In this paper, the authors address the identification problem of H(z) from the truncated autocovariance sequence (Rn)n6=0 for the case q > p:

This paper is concerned with the quadratic stabilization for a class of switched nonlinear singular systems. For this class of switched systems, when each individual subsystem fails to be minimum-phase, the quadratic stabilization problem is solved via designing switching law. This extends available results for non-switched nonlinear singular systems.

The Flare Monitoring Telescope (FMT) was constructed in 1992 at Hida Observatory in Japan to investigate the long-term variation of solar activity and explosive events. It has five solar imaging telescopes that simultaneously observe the full-disk Sun at different wavelengths around the H-alpha absorption line or in different modes. Therefore, the FMT can measure the three-dimensional velocity ...

The problem of global robust stabilization is investigated for a class of multi-input, minimum-phase nonlinear systems with unknown time-varying parameters or disturbances belonging to a given compact set. It is assumed that the systems admit a special structure, which is much more general than strict feedback form. It is shown that such a structure makes it possible to construct both Lyapunov ...

To measure the extent to which individual glottal features obtained via inverse filtering can be used to discriminate between the speech of different speakers, we test a set of 16 glottal parameters on a 50-speaker subset of the TIMIT corpus in a frame-level pairwise speaker discrimination task. In addition, we compare a vector of glottal parameters to a set of spectral envelope features in the...