BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Volker Mehrmann (TU Berlin) DTSTART:20240131T150000Z DTEND:20240131T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/1 DESCRIPTION:Title: Port-Hamiltonian systems: algebraic\, geometric and operator theoretic r epresentations\nby Volker Mehrmann (TU Berlin) as part of Port-Hamilto nian Seminar (pH Seminar)\n\n\nAbstract\nDifferent representations of diss ipative Hamiltonian and port-Hamiltonian differential-algebraic equations (DAE) systems are presented and compared. Using global geometric and algeb raic points of view\, translations between the different representations a re presented. The results also apply in the Hilbert space setting of linea r operator equations. Characterizations are also derived when a general DA E system can be transformed into one of these structured representations. Approaches for computing the structural information and the described tran sformations are derived that can be directly implemented as numerical meth ods. The results are demonstrated with a large number of examples.\n\nJoin t work partly with Arjan van der Schaft and partly with Hans Zwart\n LOCATION:https://researchseminars.org/talk/PHSeminar/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Denis Matignon (ISAE-SUPAERO\, Toulouse) DTSTART:20240306T150000Z DTEND:20240306T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/2 DESCRIPTION:Title: The partitioned finite element method for port-Hamiltonian systems: a st ructure-preserving discretization for boundary controlled wave and heat PD Es\nby Denis Matignon (ISAE-SUPAERO\, Toulouse) as part of Port-Hamilt onian Seminar (pH Seminar)\n\n\nAbstract\nBoundary controlled and observed wave and heat PDEs can be recast as port-Hamiltonian systems on an n-D do main\, starting from physical principles and allowing for a power balance which proves most useful when interconnecting such subsystems.\n\nA mixed finite element method ensures the preservation of these properties at the discrete level: this will be introduced with a primer on the finite elemen t method (FEM)\; then\, some optimal convergence results will be provided and illustrated on the 2D inhomogeneous and anisotropic wave equation.\n\n Finally\, the effectiveness of PFEM will finally be illustrated when captu ring refined asymptotic behaviours of the coupled heat-wave PDE system in different geometric configurations.\n\nJoint work partly with Ghislain Hai ne.\n LOCATION:https://researchseminars.org/talk/PHSeminar/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Bernhard Maschke (U Claude Bernard Lyon 1Lyon) DTSTART:20240403T140000Z DTEND:20240403T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/3 DESCRIPTION:Title: The geometry of the state space of physical systems and the consequences on the definition of Port-Hamiltonian systems\nby Bernhard Maschke (U Claude Bernard Lyon 1Lyon) as part of Port-Hamiltonian Seminar (pH Semina r)\n\n\nAbstract\nIn the first part\, we recall the geometric structure of the state space of physical systems. Indeed\, for Thermodynamical systems \, it is well accepted that the system is first defined by its so-called e quilibrium properties. These properties are defined by a set of relations among the extensive and intensive variables\, the Thermodynamic Phase vari ables\, which should satisfy the Gibbs' equations. Actually Gibbs' equatio ns define a Legendre submanifold of the Thermodynamic Phase Space which is generated by a family of functions\, called thermodynamic functions. This Legendre submanifolds actually defines the state space of the system.\n\n A similar construction holds for Hamiltonian systems arising for mechanica l systems or electro-mechanical systems' models\, when instead of defining a Hamiltonian function\, one considers the reciprocal constitutive relati ons relating the energy and the co-energy variables. These reciprocal rela tions define a Lagrangian submanifold of the cotangent space of the energy variables (the space of energy and the co-energy variables).\n\nIn the se cond part of the talk\, we shall draw the consequence of the definition of the state space Lagrange or Legendre submanifolds for Hamiltonian and por t Hamiltonian systems. Indeed\, defining the state space as a submanifold of some phase space\, corresponds to an implicit definition of the Hamilto nian dynamics. For irreversible Thermodynamic systems\, one defines a cont act Hamiltonian system on the Thermodynamic Phase Space\, leaving invarian t some Legendre submanifold. For Hamiltonian systems defined on Lagrange s ubmanifolds\, one defines a implicit Hamiltonian system restricted to some Lagrange submanifold.\n\nWe shall finally present some ongoing work\, how this geometric perspective of the state space of physical systems\, leads to define a novel class of Port Hamiltonian systems equipped with a new t ype of port variables\, derived from the definition of Lagrange or Legendr e submanifolds. We shall illustrate the work with various simple examples taken from physical and engineering systems.\n LOCATION:https://researchseminars.org/talk/PHSeminar/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Paul Kotyczka (TU Munich) DTSTART:20240508T140000Z DTEND:20240508T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/4 DESCRIPTION:Title: Geometric integration and discrete-time port-Hamiltonian systems\nby Paul Kotyczka (TU Munich) as part of Port-Hamiltonian Seminar (pH Seminar )\n\n\nAbstract\nThe interest of this talk is to show possibilities to pre serve “structure” when continuous-time port-Hamiltonian (PH) models ar e translated via numerical integration to the discrete-time domain. On the example of a simple\n(mechanical) Hamiltonian system with one degree of f reedom\, we first illustrate symplecticity\, i.e.\, area preservation in t he phase plane\, of the flow as an underlying structural property\, from w hich energy conservation is derived. Consequently\, we give examples for n umerical integration schemes that are symplectic or energy-conserving.\n\n Both families of integrators can be used for the definition of discrete-ti me PH systems\, where the definitions of discrete-time port variables play a fundamental role to describe energy transfer over the system boundary. We highlight similarities and differences using the two paths\, in particu lar based on the discrete-time energy balance equations.\n\nFinally\, we g ive two examples from our recent research\, where discrete-time models of geometrically nonlinear systems – elastic continua and beams – are obt ained with structure-preserving methods.\n LOCATION:https://researchseminars.org/talk/PHSeminar/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Jacquelien Scherpen (RU Groningen) DTSTART:20240531T090000Z DTEND:20240531T100000Z DTSTAMP:20260513T182051Z UID:PHSeminar/5 DESCRIPTION:Title: Contraction\, regulation\, trajectory tracking and coupled damping for c lasses of port-Hamiltonian systems\nby Jacquelien Scherpen (RU Groning en) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nThis t alk investigates the regulation and trajectory tracking problems for class es of mechanical and Electromechanical (EM) systems. To this end\, we form ulate energy-based models within the port-Hamiltonian (pH) framework. Usin g the pH framework\, we employ standard Lyapunov theory and contraction th eory to develop control approaches with physical interpretation. These met hods are related to the well-known Interconnection and Damping Assignment Passivity-Based Control approach. However\, the proposed control methods r emove the need for solving partial differential equations or implementing any change of coordinates. In detail\, in the case of mechanical systems\ , we propose control design methods using dynamic extensions to remove vel ocity measurements from the controllers while rejecting matched and unmatc hed disturbances. In addition\, we suggest control approaches specifical ly using the notion of  coupled damping to enhance the performance of tra nsient response and the convergence rate in the EM systems. The applicabil ity of these methods is illustrated via different mechanical and electrome chanical applications.\n LOCATION:https://researchseminars.org/talk/PHSeminar/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Silke Glas (U Twente) DTSTART:20240703T140000Z DTEND:20240703T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/6 DESCRIPTION:Title: Model Reduction on Manifolds: from a differential geometric formulation to data-driven realizations\nby Silke Glas (U Twente) as part of Port- Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nPort-Hamiltonian structure s have a pervasive impact in numerous applied domains enlarging the more t raditional mechanical one. While these structures are unequivocally charac terized in the continuous-time domain\, several descriptions are proposed in the literature when referring to discrete-time or sampled dynamics. In this talk we discuss a description of port-Hamiltonian structures in discr ete time that makes reference to the notion of average passivity\, introdu ced to deal with systems without throughput. Exploiting the average passiv ity property of these forms\, we show how damping feedback and energy-base d control strategies can be designed. Then\, we investigate the sampled-da ta case and show how these forms set in discrete-time can be recovered und er time-integration through modification of the interconnection and dissip ation matrices characterizing the continuous-time dynamics. Some simulatio ns are presented to illustrate analysis and control performances.\n LOCATION:https://researchseminars.org/talk/PHSeminar/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Yann Le Gorrec (FEMTO-ST\, Besançon) DTSTART:20240911T140000Z DTEND:20240911T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/7 DESCRIPTION:Title: Modelling\, interconnection and control of irreversible port Hamiltonian systems\nby Yann Le Gorrec (FEMTO-ST\, Besançon) as part of Port-Ham iltonian Seminar (pH Seminar)\n\n\nAbstract\nOriginating in macroscopic me chanics\, port Hamiltonian formulations were proposed and intensively used for the modular modelling and control of conservative and dissipative mul tiphysics systems for which the thermal domain does not need to be explici tly represented. Yet in many cutting-edge engineering applications\, for e xample within the field of soft or micro-nano robotics\, process control\, material sciences\, energy production etc … temperature plays a central role and needs to be explicitly taken into account. This class of systems is referred to as Irreversible Thermodynamic systems. Several attempts ha ve been made to extend port Hamiltonian and Lagrangian formulations to Irr eversible Thermodynamic systems. Among them\, the Irreversible port Hamilt onian formulations\, which consider the entropy as additional state variab le\, are particularly promising for their simplicity\, their constructiven ess and the amount of information they can encode.\n\nIn the first part of this talk we recall some definitions and properties of finite dimensional Irreversible port Hamiltonian systems. We show how this structure allows to cope with the first and second principles of Thermodynamics i.e. conser vation of the internal energy and irreversible entropy creation. We then s how how the interconnection of two controlled lrreversible port Hamiltonia n Systems via thermal ports has to be state and co-state modulated in orde r to ensure the closed-loop lrreversible port Hamiltonian structure\, sati sfying the first and second laws of Thermodynamics. This modulation and cl osed loop invariants are then used to derive efficient controllers via ene rgy shaping and entropy assignment. In the second part of this talk we pre sent some recent extensions to boundary controlled distributed parameter s ystems defined on a 1D spatial domain and show\, on the heat equation exam ple\, how similar energy shaping and entropy assignment techniques can be used for control design.\n\nThis talk is based on a joint work with Hector Ramirez and Bernhard Maschke.\n LOCATION:https://researchseminars.org/talk/PHSeminar/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Philipp Schulze (TU Berlin) DTSTART:20241002T140000Z DTEND:20241002T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/8 DESCRIPTION:Title: Structure-Preserving Model Reduction for Dissipative and Port-Hamiltonia n Systems\nby Philipp Schulze (TU Berlin) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nModel order reduction (MOR) is a power ful tool for reducing the computational effort in applications where a com putational model needs to be evaluated multiple times\, e.g.\, in control and optimization. MOR aims to replace the full-order model (FOM) by a redu ced-order model (ROM) which should be cheap to evaluate and sufficiently a ccurate. In many applications it is also desirable to preserve important p roperties of the FOM such as stability or passivity. One possibility to gu arantee this preservation is to use MOR schemes which preserve a dissipati ve or port-Hamiltonian structure. While there are structure-preserving var iants of the most common MOR techniques available\, these methods typicall y lack computable a priori error bounds and suffer from a loss of accuracy in comparison to their non-structure-preserving counterparts. Moreover\, these techniques are based on linear subspace approximations of the FOM st ate and such linear approaches usually perform poorly for transport-domina ted systems.\n\nIn the first part of this talk\, we present a structure-pr eserving balancing-based MOR approach which allows to provide computable a priori error bounds. Furthermore\, we demonstrate that the accuracy of th e ROM may be significantly improved by replacing the FOM Hamiltonian by an other one which is based on an extremal solution of the corresponding Kalm an-Yakubovich-Popov inequality. In the second part of this talk\, we addre ss the question of how to construct structure-preserving MOR schemes when using a nonlinear approximation ansatz\, which is especially relevant in t he context of transport-dominated systems. For a special class of nonlinea r ansatzes\, we demonstrate that structure-preserving ROMs may be obtained based on a weighted residual minimization scheme. The effectiveness of th e presented approaches is demonstrated by means of numerical examples.\n\n The first part of this talk is based on joint work with Tobias Breiten and Riccardo Morandin.\n LOCATION:https://researchseminars.org/talk/PHSeminar/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Dorothée Normand-Cyrot (Laboratoire des Signaux et Systèmes\, Pa ris) DTSTART:20241106T150000Z DTEND:20241106T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/9 DESCRIPTION:Title: About a class of discrete-time and sampled-data Hamiltonian structures\nby Dorothée Normand-Cyrot (Laboratoire des Signaux et Systèmes\, Par is) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nPort-H amiltonian structures have a pervasive impact in numerous applied domains enlarging the more traditional mechanical one. While these structures are unequivocally characterized in the continuous-time domain\, several descri ptions are proposed in the literature when referring to discrete-time or s ampled dynamics. In this talk we discuss a description of port-Hamiltonian structures in discrete time that makes reference to the notion of average passivity\, introduced to deal with systems without throughput. Exploitin g the average passivity property of these forms\, we show how damping feed back and energy-based control strategies can be designed. Then\, we invest igate the sampled-data case and show how these forms set in discrete-time can be recovered under time-integration through modification of the interc onnection and dissipation matrices characterizing the continuous-time dyna mics. Some simulations are presented to illustrate analysis and control pe rformances\n LOCATION:https://researchseminars.org/talk/PHSeminar/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Timo Reis (TU Ilmenau) DTSTART:20241204T150000Z DTEND:20241204T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/10 DESCRIPTION:Title: Energy-Optimal Control for infinite-dimensional port-Hamiltonian System s\nby Timo Reis (TU Ilmenau) as part of Port-Hamiltonian Seminar (pH S eminar)\n\n\nAbstract\nWe first present a theory for the optimal control o f infinite-dimensional systems described by system nodes. In this context\ , we focus on minimizing the L^2-norm of the output\, combined with an add itional weighting of the final state. The input is assumed to lie within a closed and convex set.\nNext\, we address energy-optimal control for infi nite-dimensional port-Hamiltonian systems. We show that minimizing the sup plied energy can be reformulated as an equivalent output minimization prob lem. The theory will be illustrated using a boundary control wave equation on a two-dimensional spatial domain.\n LOCATION:https://researchseminars.org/talk/PHSeminar/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Claudia Totzeck (BU Wuppertal) DTSTART:20250108T150000Z DTEND:20250108T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/11 DESCRIPTION:Title: On the port-Hamiltonian structure of interacting particle systems\n by Claudia Totzeck (BU Wuppertal) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nWe discuss novel applications of interacting parti cle systems in the context of socio-economic applications and reveal their port-Hamiltonian structure\, which can be used to study their long-time b ehaviour. Moreover\, we discuss some results of optimal control of interac ting particle systems. The theory will be underpinned by numerical simulat ion results.\n LOCATION:https://researchseminars.org/talk/PHSeminar/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Thomas Beckers (Vanderbilt University) DTSTART:20240814T140000Z DTEND:20240814T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/12 DESCRIPTION:Title: Composable Physics-Informed Learning with Uncertainty Quantification ba sed on Port-Hamiltonian systems\nby Thomas Beckers (Vanderbilt Univers ity) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nData- driven approaches achieve remarkable results for modeling nonlinear system s based on collected data. However\, these models often neglect basic phys ical principles which determine the behavior of any real-world system. Thi s omission is unfavorable in two ways: The models are not as data-efficien t as they could be by incorporating physical prior knowledge\, and the mod el itself might not be physically consistent. \nIn this talk\, I will pres ent our results on physics-constrained Gaussian processes for learning of dynamical system with a focus on the class of electromechanical systems. I will propose Gaussian Process Port-Hamiltonian systems (GP-PHS) as a phys ics-constrained\, nonparametric Bayesian learning approach with uncertaint y quantification for ODE and PDE systems with unknown dynamics. \nIn contr ast to many physics-informed techniques that impose physics by penalty\, t he proposed data-driven model is physically correct by design. The framewo rk is in particular suitable for composable learning as its structure can be preserved under interconnection. Finally\, I demonstrate the applicatio n of the model within a robust control framework to enable safe learning-b ased control.\n LOCATION:https://researchseminars.org/talk/PHSeminar/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Stefano Stramigioli (U Twente) DTSTART:20250205T150000Z DTEND:20250205T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/13 DESCRIPTION:Title: The geometry and topology of Ports\nby Stefano Stramigioli (U Twent e) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nIn this lecture the importance of a coordinate invariant description of ports wil l be given introducing the mathematical structure of the most general case possible which can be used in a topological setting. As an example of the power of such methodology\, some results of the PortWings project will be presented\, also relating to non-linear elasticity.\n LOCATION:https://researchseminars.org/talk/PHSeminar/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Arjan van der Schaft (U Groningen) DTSTART:20250402T140000Z DTEND:20250402T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/14 DESCRIPTION:Title: Symmetry in linear physical systems\nby Arjan van der Schaft (U Gro ningen) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nPh ysical systems with symmetry arise abundantly in applications\, and are en dowed with interesting mathematical structures. In this talk we will focus on reciprocal and input-output Hamiltonian systems. Their characterizatio n is studied from a state point of view\, as well as from an input-output point of view. In particular\, reciprocal systems give rise to a symmetric kernel of their Hankel operator\, while input-output Hamiltonian systems are more naturally approached from a Volterra operator point of view. Geom etrically\, it turns out that both define Lagrangian subspaces with corres ponding generating functionals. Next\, the close relations with port-Hamil tonian systems and time reversibility will be considered. The system class es under consideration are expected to admit scalable control laws\, and t o be important building blocks in control design.\n LOCATION:https://researchseminars.org/talk/PHSeminar/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Hans Zwart (U Twente) DTSTART:20250305T150000Z DTEND:20250305T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/15 DESCRIPTION:Title: An introductory talk on infinite dimensional port-Hamiltonian systems\nby Hans Zwart (U Twente) as part of Port-Hamiltonian Seminar (pH Semin ar)\n\n\nAbstract\nEquations describing Port-Hamiltonian systems come in m any forms\, they can be ordinary linear or non-linear differential equatio ns\, and even discrete time difference equations. In this presentation we consider port-Hamiltonian systems described by partial differential equati ons. We show that the Hamiltonian leads to a very natural choice of the st ate space\, and this choice leads to easy checkable conditions for e.g. ex istence of solutions. By combining mathematical techniques with the power balance\, properties like stability can be shown.\n LOCATION:https://researchseminars.org/talk/PHSeminar/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Hector Ramirez Estay (Valparaiso) DTSTART:20250507T140000Z DTEND:20250507T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/16 DESCRIPTION:Title: Reduced-order energy shaping control of large-scale linear port-Hamilto nian systems\nby Hector Ramirez Estay (Valparaiso) as part of Port-Ham iltonian Seminar (pH Seminar)\n\n\nAbstract\nIn this talk\, we present a r educed-order energy shaping control approach tailored for large-scale line ar port-Hamiltonian systems\, such as those arising from distributed param eter models and networked structures. We introduce dynamic controllers des igned using both low-dimensional models and reduced-order models obtained through modal truncation\, ensuring asymptotic stability by leveraging str uctural invariants. Special attention is given to shape control applicatio ns\, where equilibrium points are parametrized through controller paramete rs\, allowing optimization of the closed-loop configuration accuracy. Addi tionally\, we discuss stability margins that link reduced-order model prop erties to transient performance. Practical implementation is illustrated t hrough dynamic shape control of a Mindlin plate\, demonstrating the effect iveness of the proposed methodology. The talk is based on a joint work wit h Cristobal Ponce (AC3E\, Chile) and Yann Le Gorrec (FEMTO-ST\, France).\n LOCATION:https://researchseminars.org/talk/PHSeminar/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Alessandro Macchelli (U Bologna) DTSTART:20250604T140000Z DTEND:20250604T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/17 DESCRIPTION:Title: A Class of Discrete-Time Port-Hamiltonian Systems. Modelling and Contro l Design\nby Alessandro Macchelli (U Bologna) as part of Port-Hamilton ian Seminar (pH Seminar)\n\n\nAbstract\nIn this talk\, we present a genera l approach to derive discrete-time approximations of lumped and distribute d-parameter port-Hamiltonian systems. Since the goal is to preserve passiv ity\, the key ingredient has been to replace the gradient of the Hamiltoni an function that appears in the continuous-time dynamics with a discrete g radient. In this way\, the discrete-time approximation inherits the passiv ity of the initial continuous-time dynamics. In finite dimensions\, the re sult is a state equation in implicit form\, while for linear boundary cont rol systems\, we obtain a boundary-value problem to be solved at each step . In both cases\, the well-posedness of the resulting discrete-time dynami cs is discussed. Regarding control design\, the continuous-time energy-sha ping plus damping injection technique is extended to the discrete-time sce nario. In the final part of the talk\, we briefly discuss the problem of c oupling the digital controller with the continuous-time plant and the use of such models in a model predictive control scheme.\n LOCATION:https://researchseminars.org/talk/PHSeminar/17/ END:VEVENT BEGIN:VEVENT SUMMARY:Thomas Hélie (IRCAM Paris) DTSTART:20251001T140000Z DTEND:20251001T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/18 DESCRIPTION:Title: Two focuses on the use of Port-Hamiltonian in Musical acoustics\nby Thomas Hélie (IRCAM Paris) as part of Port-Hamiltonian Seminar (pH Semin ar)\n\n\nAbstract\nThis talk illustrates the motivations for using port-Ha miltonian systems (PHS) in musical acoustics through two complementary cas e studies\, one elementary and one advanced.\nThe first part shows how the basic tools of the PHS framework can already be used to construct the sim plest passive prototype of self-oscillating instrument\, with the aim of m aking explicit the fundamental mechanisms of energy exchange and auto-osci llation. \nThe second part addresses a more advanced scenario\, where homo genisation methods are combined with port-Hamiltonian formulations to desc ribe infinite-dimensional dynamics\, exemplified by acoustic propagation i n a pipe with a porous wall. Together\, these two perspectives illustrate the range of modelling possibilities offered by the port-Hamiltonian frame work\, from elementary prototypes to sophisticated multiscale descriptions .\n LOCATION:https://researchseminars.org/talk/PHSeminar/18/ END:VEVENT BEGIN:VEVENT SUMMARY:Pablo Borja (U Plymouth) DTSTART:20250702T140000Z DTEND:20250702T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/19 DESCRIPTION:Title: Passivity-based control of mechanical systems\nby Pablo Borja (U Pl ymouth) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nMe chanical systems are crucial in sectors such as construction\, manufacturi ng\, and transportation\, where relevant examples of these systems include cranes\, robots\, and autonomous vehicles. This talk discusses some intui tive control design methods for mechanical systems. Such strategies are ba sed on exploiting the port-Hamiltonian structure of these systems and thei r passivity property.\n LOCATION:https://researchseminars.org/talk/PHSeminar/19/ END:VEVENT BEGIN:VEVENT SUMMARY:Riccardo Morandin (Otto-von-Guericke-Universität Magdeburg) DTSTART:20250903T140000Z DTEND:20250903T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/20 DESCRIPTION:Title: Time discretization of port-Hamiltonian differential-algebraic equation s\nby Riccardo Morandin (Otto-von-Guericke-Universität Magdeburg) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nIn this talk we address the time discretization of port-Hamiltonian (pH) differential-a lgebraic equations (DAE). This combines the challenges of discretizing a D AE consistently\, and preserving the pH properties\, two tasks which are n ontrivial to fulfill at the same time. In particular\, we will discuss the application of Runge-Kutta methods\, among which collocation methods are treated as a special case\, discrete gradient methods\, and partitioned me thods\, with a particular focus on semi-explicit pHDAEs. This talk include s joint work with Philipp Kinon\, Volker Mehrmann\, and Philipp Schulze.\n LOCATION:https://researchseminars.org/talk/PHSeminar/20/ END:VEVENT BEGIN:VEVENT SUMMARY:Serkan Gugercin (Virginia Tech) DTSTART:20251203T150000Z DTEND:20251203T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/21 DESCRIPTION:Title: Model Reduction for port-Hamiltonian System\nby Serkan Gugercin (Vi rginia Tech) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstrac t\nThis talk provides a brief introduction to the fundamentals of model re duction\, highlighting why reduced models are essential for large-scale dy namical systems. We will focus on interpolatory model reduction methods\, outlining their key ideas and their connection to optimal approximation in the H2 norm. We then demonstrate how these techniques can be extended to model reduction of port-Hamiltonian systems\, enabling structure-preservin g\, efficient\, and accurate reduced-order representations.\n LOCATION:https://researchseminars.org/talk/PHSeminar/21/ END:VEVENT BEGIN:VEVENT SUMMARY:Manuel Schaller (TU Chemnitz) DTSTART:20251105T150000Z DTEND:20251105T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/22 DESCRIPTION:Title: Exploiting port-Hamiltonian and dissipative structures in numerical opt imal control of PDEs\nby Manuel Schaller (TU Chemnitz) as part of Port -Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nIn this talk\, we explore several ways to leverage (port-)Hamiltonian structures in the solution of optimal control problems.\n\nWe first present a novel time-domain decompo sition strategy. Therein\, the optimality system is formulated as a sum of dissipative operators\, which enables a Peaceman–Rachford and Dougla-Ra chford-type fixed-point iterations in function space. The resulting subpro blems correspond to local optimal control problems on shorter time horizon s and can be solved in parallel. Using the dissipativity of the formulatio n\, we establish convergence of the method.\n\nIn the second part\, we foc us on tailored iterative solvers for linear systems arising from the discr etization of port-Hamiltonian optimal control problems. In particular\, we will inspect Krylov subspace methods that utilize the symmetric part of t he operator as a preconditioner to guarantee mesh-independent convergence. \n\nWe illustrate our results by means of various large-scale problems fro m fluid mechanics\, elasticity or advection-diffusion phenomena.\n LOCATION:https://researchseminars.org/talk/PHSeminar/22/ END:VEVENT BEGIN:VEVENT SUMMARY:Kirsten Morris (University of waterloo) DTSTART:20260204T150000Z DTEND:20260204T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/33 DESCRIPTION:Title: Discretization of port-Hamiltonian systems\nby Kirsten Morris (Univ ersity of waterloo) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\n Abstract\nController design for distributed parameter systems is often acc omplished using a lumped approximation. For a system that is exponentially stable\, it is reasonable to expect the approximation to preserve this de cay rate. Preservation of the decay rate is important for realistic simula tions and also for reliable controller design. An example illustrating the problems that can occur even in a simple problem will be given. It will be shown that a number of standard methods - not all - are structure-prese rving for a class of port-Hamiltonian systems. Most importantly\, when the se systems are exponentially stable\, a uniform decay rate is preserved by the approximations. The method is to show that a modification of the ener gy yields a Lyapunov function. The results are illustrated with simulati ons of an example of LQ-optimal controller design.\n LOCATION:https://researchseminars.org/talk/PHSeminar/33/ END:VEVENT BEGIN:VEVENT SUMMARY:Karim Cherifi (Femto-ST) DTSTART:20260114T150000Z DTEND:20260114T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/34 DESCRIPTION:Title: System identification of port-Hamiltonian systems\nby Karim Cherifi (Femto-ST) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract \nSystem identification is essential in modeling\, analysis\, and control of dynamical systems\, particularly when first-principles models are incom plete or unavailable. In this talk\, we begin with a brief introduction to system identification\, outlining its main objectives\, challenges. We th en focus on structured modeling frameworks\, with particular emphasis on p ort-Hamiltonian systems\, which have attracted significant attention due t o their strong ties to physics\, energy-based interpretation\, and interes ting properties for control and stability analysis. We study system identi fication under explicit structural and physical constraints\, using the po rt-Hamiltonian formalism as a unifying framework\, starting with the ident ification of linear port-Hamiltonian systems\, and highlighting how struct ure-preserving approaches can be leveraged to recover physically consisten t models from data. We then move to nonlinear port-Hamiltonian systems and discuss recent methods that enable their learning from data\, including g eneralizations to higher-order and more complex systems through neural sca ling laws. The talk concludes with a discussion of current research direct ions\, including recently proposed architectures for learning port-Hamilto nian systems.\n LOCATION:https://researchseminars.org/talk/PHSeminar/34/ END:VEVENT BEGIN:VEVENT SUMMARY:Carsten Hartmann (BTU Cottbus-Senftenberg) DTSTART:20260506T140000Z DTEND:20260506T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/35 DESCRIPTION:Title: Stochastic port-Hamiltonian systems of Langevin-type: realisation of co nstraints\nby Carsten Hartmann (BTU Cottbus-Senftenberg) as part of Po rt-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nThe realisation of cons traints by strong confining forces is a classical theme in mechanics. Rece ntly\, there has been a growing interest in studying constrained stochasti c differential equations\, due to their relevance in molecular dynamics\, power network modelling\, or machine learning. \n\nIn this talk\, we will discuss the realisation of algebraic constraints on so-called underdamped Langevin systems that are a special kind of stochastic port-Hamiltonian sy stems\, the key property being that the noise coefficient is degenerate an d acts only on those states that are subject to friction. Physically\, con straints can be realised by different mechanisms\, such as strong forces o r large friction\, but also small or large masses. We will discuss limit t heorems for several of these confinement mechanisms from both physical and mathematical perspective\, including quantitative convergence results. It turns out that some of the confinement mechanisms provide uniform-in-time approximations of the limiting differential-algebraic (i.e. constrained) system\, but others do not\, and we will explain why this observation is r elevant for Monte-Carlo sampling of high-dimensional probability distribut ions. \n\nThis is joint work with Lara Neureither (Cottbus) and Upanshu Sh arma (Sydney).\n\nReferences: \n\n[1] Hartmann\, C.\, Neureither\, L.\, & Sharma\, U. (2025). Affine constraints in non-reversible diffusions with d egenerate noise. arXiv preprint arXiv:2505.00243 (to appear in SIADS).\n\n [2] Hartmann\, C.\, Neureither\, L.\, & Sharma\, U. (2026). Realisation of constraints in underdamped Langevin dynamics. arXiv preprint arXiv:2604.0 2129.\n LOCATION:https://researchseminars.org/talk/PHSeminar/35/ END:VEVENT BEGIN:VEVENT SUMMARY:Federico Califano (University of Twente) DTSTART:20260304T150000Z DTEND:20260304T160000Z DTSTAMP:20260513T182051Z UID:PHSeminar/36 DESCRIPTION:Title: A geometric perspective on port-Hamiltonian systems\nby Federico Ca lifano (University of Twente) as part of Port-Hamiltonian Seminar (pH Semi nar)\n\n\nAbstract\nPort-Hamiltonian (pH) systems have gained extreme popu larity in the last 3 decades in different fields. As examples\, mathematic ians use pH formulations to assess well-posedeness of partial differential equations\, data-scientists and numerical engineers exploit pH formulatio ns to develop structure-preserving integrators\, physicist acknowledge pH theory as an insightful extension of Hamiltonian dynamics\, and system the orists use pH formulations for modelling and control purposes.\n\nPH theor y is being studied by different communities from different angles and at d ifferent levels of abstraction. As examples\, some see pH systems as parti cular cases of differential equations with inputs\, and some identify pH s ystems with abstract underlying geometric structures which are hard to gra sp without a formal mathematical training. \n\nOften this plurality of vis ion in understanding pH systems\, as well as the relatively young age of t he topic\, can cause confusion in scientists and engineers approaching the topic.\n\nThis seminar wants to provide a synthesis of the deep meaning o f pH systems\, general enough to embrace the plurality of ways the topic c an be approached\, and focalised enough to transmit the common seed consti tuting the hearth of pH theory.\n LOCATION:https://researchseminars.org/talk/PHSeminar/36/ END:VEVENT BEGIN:VEVENT SUMMARY:Anthony Hastir (University of Namur) DTSTART:20260603T140000Z DTEND:20260603T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/37 DESCRIPTION:by Anthony Hastir (University of Namur) as part of Port-Hamilt onian Seminar (pH Seminar)\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/PHSeminar/37/ END:VEVENT BEGIN:VEVENT SUMMARY:Michal Wojtylak (agiellonian University) DTSTART:20260401T140000Z DTEND:20260401T150000Z DTSTAMP:20260513T182051Z UID:PHSeminar/38 DESCRIPTION:Title: Linear algebra of dissipative Hamiltonian systems.\nby Michal Wojty lak (agiellonian University) as part of Port-Hamiltonian Seminar (pH Semin ar)\n\n\nAbstract\nWe will begin with a review of the Kronecker of pencils appearing in the port Hamiltonian modelling. Although the task seems to be completed by [1]\, and [2]\, the transfer function considerations in [3] put a different light on these results.\n\nIn the second part of the talk we will concentrate on the eigenvalue infinity\, and the size of the largest Kronecker block - the index. \nWe will study the perturbation pr operties of the eigenvalue infinity\, presenting non-asymptotic results ba sed on the Bauer-Fike theorem\, see [4]. Several numerical examples will be considered.\n\n[1] C. Mehl\, V. Mehrmann\, and M. Wojtylak. Matrix pen cils with coefficients that have positive\nsemidefinite Hermitian parts. S IMAX 2022. \n\n[2] N. Gillis\, V. Mehrmann\, and P. Sharma. Computing the nearest stable matrix pairs. NLAA\, 2018.\n\n[3] K. Cherifi\, H. Gernandt \, and D. Hinsen. The difference between port-Hamiltonian\, passive and\np ositive real descriptor systems. MCSS\, 2024.\n\n[4] H. Blazhko\, M. Wojt ylak\, Detection of the higher order Kronecker blocks by perturbation\, 20 26 \, preprint.\n LOCATION:https://researchseminars.org/talk/PHSeminar/38/ END:VEVENT BEGIN:VEVENT SUMMARY:Antoine Tordeux (University of Wuppertal) DTSTART:20260701T140000Z DTEND:20260701T150000Z DTSTAMP:20260513T182052Z UID:PHSeminar/39 DESCRIPTION:by Antoine Tordeux (University of Wuppertal) as part of Port-H amiltonian Seminar (pH Seminar)\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/PHSeminar/39/ END:VEVENT BEGIN:VEVENT SUMMARY:Sebastian Schöps (TU Darmstadt) DTSTART:20260902T140000Z DTEND:20260902T150000Z DTSTAMP:20260513T182052Z UID:PHSeminar/40 DESCRIPTION:by Sebastian Schöps (TU Darmstadt) as part of Port-Hamiltonia n Seminar (pH Seminar)\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/PHSeminar/40/ END:VEVENT END:VCALENDAR