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#modconflex

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Tonight, #ModConFlex will be on TV!

A few weeks ago, a small team from regional TV passed by @uni_wuppertal to meet with our coordinator and one of the PhD students.

And tonight, our coordinator will also be interviewed live on TV. In a day or two, this should be available here:

ardmediathek.de/sendung/lokalz (in German, though - we will translate in a few days).

#ModConFlex researcher Mario Sinani co-authored

"Capturing & Bounding Nonlinear Modal Energy Transfer for Geometrically Exact Beams using Semi-Definite Programming"

css.paperplaza.net/images/temp

➡️ method to simplify how flexible structures like aircraft wings vibrate when they bend and twist in complex, nonlinear ways. Automatically selects the most important vibration patterns to accurately represent this motion, simplifiying analysis and control.

Last week, several #ModConFlex researchers presented at the 5th IFAC Workshop on Control of Systems Governed by Partial Differential Equations - CDPE 2025 - at Beijing.

In total, 5 Ph.D. students from four different project nodes (Besançon, Tel Aviv, Twente and Wuppertal) and three supervisors attended.

Ignacio Diaz and Bouchra Elghazi were on the shortlist for the Young Author Award and Bouchra even won the prize in the end. Congratulations!

#HorizonEU
#MSCA

Hybrid Schrödinger-Liouville and projective dynamics:

Arguably the most fundamental example of a hybrid system that alternates between continuous and discrete dynamics is a quantum system. We showed that its dynamics can be cast into one single equation on extended space which makes it amenable to port-theoretic description.

arxiv.org/abs/2504.05532

#HybridSystems
#QuantumTheory

Presentation at cpde2025.bjut.edu.cn (Beijing) this week by #ModConFlex researcher Kaja Krhač.

New paper by #ModConFlex researcher Zhuo Xu on the robustness of a fluid-particle interaction system.

"A distinctive feature, not yet considered in the ISS literature, is that our system involves a free boundary. More precisely, the fluid is described by the viscous Burgers equation, and the motion of the particle obeys Newton second law. ... The proof is based on the construction of a Lyapunov functional derived from a special test function."

arxiv.org/abs/2505.08393

#PDE

#MSCA
#HorizonEU

How can a central server effectively use a limited reward budget to motivate distributed clients to cooperate?

*A Potential Game Perspective in Federated Learning* explores this multi-agent interaction and decision-making problem through economic and game-theoretic perspectives:

arxiv.org/abs/2411.11793

#gametheory
#federatedlearning

#ArtificialIntelligence
#MachineLearning

#HorizonEU
#ModConFlex

Useful e.g. to build data-driven floating wind turbine models from distributed data.

The first #ModConFlex network meeting took place in November 2023 @utwente .

12 freshly hired Researchers (PhD students) and their supervisors plus a few more project participants met for the first time at the University of Twente.

After a day of meetings with lively discussions also during the breaks the day was concluded by a cozy dinner at the conference venue.

The Researchers stayed on for five additional days of learning.
Videos / slides available:

modconflex.uni-wuppertal.de/de

Last 2024 publication within the #ModConFlex project:

"LQR control for a system describing the interaction between a floating solid and the surrounding fluid" on #mathematics of #solid moving on the #sea and #control acting on the solid.

Co-authored by #ModConFlex #MSCA researcher Zhuo Xu and published in Mathematical Control and Related Fields:

aimsciences.org//article/doi/1

Congratulations to Zhuo for his first #publication !

#controltheory

#offshorewind
#floatingwindfarms

Mathematical Control and Related FieldsLQR control for a system describing the interaction between a floating solid and the surrounding fluidThis paper studies an infinite time horizon LQR optimal control problem for a system describing, within a linear approximation, the vertical oscillations of a floating solid, coupled with the motion of the free boundary fluid on which it floats. The fluid flow is described by a viscous version of the linearized Saint-Venant equations (shallow water regime). The major difficulty we face is that the domain occupied by the fluid is unbounded so that the system is not exponentially stable. This raises challenges in proving the wellposedness, requiring the combined use of analytic semigroup theory and an interpolation technique. The main contribution of this paper is that, in spite of the lack of exponential stabilizability, we could define a wellposed LQR problem for which a Riccati-based approach to design feedback controls can be implemented.

#ModConFlex researcher Alan Valadez co-authored *stability analysis for multi-machine power systems with constant power loads*.

It provides valuable tools to analyze systems with distributed loads and advances understanding of dynamic models in modern power systems. Findings can be applied to, e.g., distributed power systems of offshore wind, offering insights into stability and operation.

#PowerSystems #StabilityAnalysis #HorizonEU #EnergyResearch #OffshoreWind

ieeexplore.ieee.org/document/1

Congratulations to #MSCA-Researcher Maddalen Irigoien, the winner of the #ModConFlex presentation prize 2024!

Maddalen's research focus is on modelling floating wind turbines. She started with the #mathematical groundwork in December 2023.

All #ModConFlex Researchers delivered excellent presentations at our 2024 #NetworkMeeting and we are happy to have such promising researchers on board of our #HorizonEU project.

#ControlTheory

#OffshoreWind
#OffshoreWindEnergy
#FloatingWindFarms

#ModConFlex #MSCA researcher Ziqi Wang is a co-author of "FedADMM-InSa: An Inexact and Self-Adaptive ADMM for Federated Learning" Federated learning (FL) emerges as a promising framework for #Learning from #DistributedData while preserving privacy. It is useful in the #WindEnergy sector. For instance, it enables #CollaborativeTraining of #WindPower #ForecastingModels among multiple #WindFarms, overcoming challenges associated with #DataPrivacy and #CommercialCompetition.

arxiv.org/pdf/2402.13989.pdf