Welcome

My name is Stephan Trenn and I am researcher in the area of applied mathematics, for more informations see the About Me page. You may also want to browse my publications, which can be filtered e.g. by keywords and coauthors. I also have profiles at Google ScholarResearchGate and ORCID.

Below, I will regularly post  news related to my research.

Finally, my Erdös number (see also here) is 4.
(Eugene P. Ryan – Geoffrey R. Burton – George B. Purdy – Paul Erdös)

Funnel paper accpeted

Our paper

Hu, Jiaming; Trenn, Stephan; Zhu, Xiaojin

A novel two stages funnel controller limiting the error derivative Journal Article

In: Systems & Control Letters, vol. 179, no. 105601, pp. 1-10, 2023, (open access).

Abstract | Links | BibTeX

has been accepted for publication in SCL. The key novel contribution is the consideration of an intermediate control signal, which first specifies what the ideal value for the error derivative is and then the controller is designed in such a way that the error derivative is close to this desired signal (in addition to ensuring that the error stays in the funnel all the time).

Switched nonlinear DAE paper accepted

Our paper

Chen, Yahao; Trenn, Stephan

On impulse-free solutions and stability of switched nonlinear differential-algebraic equations Journal Article

In: Automatica, vol. 156, no. 111208, pp. 1-14, 2023.

Abstract | Links | BibTeX

has been accepted for publication in Automatica. A key result is, that the method I and Daniel Liberzon presented in 2012 is probably not the correct approach to study impulse-freeness and stability for nonlinear switched DAEs, because this 2012-method (centered around assumption A4) is not invariant under nonlinear coordinate transformation.

Switched model reduction paper accepted

Our paper

Hossain, Sumon; Trenn, Stephan

Midpoint based balanced truncation for switched linear systems with known switching signal Journal Article

In: IEEE Transactions on Automatic Control, vol. 69, no. 1, pp. 535-542, 2024.

Abstract | Links | BibTeX

has been accepted for publication in IEEE TAC and is already available as early access.

Top Downloaded Paper

Our paper

Chen, Yahao; Trenn, Stephan; Respondek, Witold

Normal forms and internal regularization of nonlinear differential-algebraic control systems Journal Article

In: International Journal of Robust and Nonlinear Control, vol. 2021, no. 31, pp. 6562-6584, 2021, (open access).

Abstract | Links | BibTeX

was one of the top downloaded papers within one year of publication.

Reduced realization paper accepted in Automatica

Our manuscript

Hossain, Sumon; Trenn, Stephan

Reduced realization for switched linear systems with known mode sequence Journal Article

In: Automatica, vol. 154, no. 111065, pp. 1-9, 2023, (open access).

Abstract | Links | BibTeX

was accepted for publication in Automatica. The results of this paper are an important corner stone for further model reduction and more results in this direction are expected to appear soon.

Contraction paper available online

My first collabaration with Bayu and his PhD-student Hao has been accepted for publication and is now availble as early access:

Yin, Hao; Jayawardhana, Bayu; Trenn, Stephan

On contraction analysis of switched systems with mixed contracting-noncontracting modes via mode-dependent average dwell time Journal Article

In: IEEE Transactions on Automatic Control, vol. 68, iss. 10, pp. 6409-6416, 2023.

Abstract | Links | BibTeX

Nonlinear Jumps for DAEs paper online

The paper

Chen, Yahao; Trenn, Stephan

Impulse-free jump solutions of nonlinear differential-algebraic equations Journal Article

In: Nonlinear Analysis: Hybrid Systems, vol. 46, no. 101238, pp. 1-17, 2022, (open access).

Abstract | Links | BibTeX

has just appeared in the journal Nonlinear Analysis: Hybrid Systems (NAHS). For the next few weeks, you can access the manuscript directly from Elsevier.

Three papers accepted for ECC

The following three papers have been accepted for presentation at the 2022 European Control Conference (ECC22) in London, UK:

Chen, Yahao; Trenn, Stephan

Stability analysis of switched nonlinear differential-algebraic equations via nonlinear Weierstrass form Proceedings Article

In: Proceedings of the 2022 European Control Conference (ECC), pp. 1091-1096, London, 2022.

Abstract | Links | BibTeX

Mostacciuolo, Elisa; Trenn, Stephan; Vasca, Francesco

An averaged model for switched systems with state jumps applicable for PWM descriptor systems Proceedings Article

In: Proceedings of the 2022 European Control Conference (ECC), pp. 1085-1090, London, 2022.

Abstract | Links | BibTeX

Hu, Jiaming; Trenn, Stephan; Zhu, Xiaojin

Funnel control for relative degree one nonlinear systems with input saturation Proceedings Article

In: Proceedings of the 2022 European Control Conference (ECC), pp. 227-232, London, 2022.

Abstract | Links | BibTeX

Travel plans

Anticipating less travel restrictions this year I have planned my upcoming travel (see “Upcoming Travel” widget) and hope to see many of you in person again. If you are planning to attend some of the listed meetings and want to meet with me, just send me a quick email a few days before the event and I am happy to schedule lunch/dinner/coffee with you.