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:20260422T230723Z 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\n\n\nAbstract\nDifferent representations of dissipative Hamil tonian and port-Hamiltonian differential-algebraic equations (DAE) systems are presented and compared. Using global geometric and algebraic points o f view\, translations between the different representations are presented. The results also apply in the Hilbert space setting of linear operator eq uations. Characterizations are also derived when a general DAE system can be transformed into one of these structured representations. Approaches fo r computing the structural information and the described transformations a re derived that can be directly implemented as numerical methods. The resu lts are demonstrated with a large number of examples.\n\nJoint 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:20260422T230723Z 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\n\n\nAbstract\nBoundary controlled and observed wave and hea t PDEs can be recast as port-Hamiltonian systems on an n-D domain\, starti ng from physical principles and allowing for a power balance which proves most useful when interconnecting such subsystems.\n\nA mixed finite elemen t method ensures the preservation of these properties at the discrete leve l: this will be introduced with a primer on the finite element method (FEM )\; then\, some optimal convergence results will be provided and illustrat ed on the 2D inhomogeneous and anisotropic wave equation.\n\nFinally\, the effectiveness of PFEM will finally be illustrated when capturing refined asymptotic behaviours of the coupled heat-wave PDE system in different geo metric configurations.\n\nJoint work partly with Ghislain Haine.\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:20260422T230723Z 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\n\n\nAbstr act\nIn the first part\, we recall the geometric structure of the state sp ace of physical systems. Indeed\, for Thermodynamical systems\, it is well accepted that the system is first defined by its so-called equilibrium pr operties. These properties are defined by a set of relations among the ext ensive and intensive variables\, the Thermodynamic Phase variables\, which should satisfy the Gibbs' equations. Actually Gibbs' equations define a L egendre submanifold of the Thermodynamic Phase Space which is generated by a family of functions\, called thermodynamic functions. This Legendre sub manifolds actually defines the state space of the system.\n\nA similar con struction holds for Hamiltonian systems arising for mechanical systems or electro-mechanical systems' models\, when instead of defining a Hamiltonia n function\, one considers the reciprocal constitutive relations relating the energy and the co-energy variables. These reciprocal relations define a Lagrangian submanifold of the cotangent space of the energy variables (t he space of energy and the co-energy variables).\n\nIn the second part of the talk\, we shall draw the consequence of the definition of the state sp ace Lagrange or Legendre submanifolds for Hamiltonian and port Hamiltonian systems. Indeed\, defining the state space as a submanifold of some phase space\, corresponds to an implicit definition of the Hamiltonian dynamics . For irreversible Thermodynamic systems\, one defines a contact Hamiltoni an system on the Thermodynamic Phase Space\, leaving invariant some Legend re submanifold. For Hamiltonian systems defined on Lagrange submanifolds\, one defines a implicit Hamiltonian system restricted to some Lagrange sub manifold.\n\nWe shall finally present some ongoing work\, how this geometr ic perspective of the state space of physical systems\, leads to define a novel class of Port Hamiltonian systems equipped with a new type of port v ariables\, derived from the definition of Lagrange or Legendre submanifold s. We shall illustrate the work with various simple examples taken from ph ysical 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:20260422T230723Z UID:PHSeminar/4 DESCRIPTION:Title: Geometric integration and discrete-time port-Hamiltonian systems\nby Paul Kotyczka (TU Munich) as part of Port-Hamiltonian Seminar\n\n\nAbstra ct\nThe interest of this talk is to show possibilities to preserve “stru cture” when continuous-time port-Hamiltonian (PH) models are translated via numerical integration to the discrete-time domain. On the example of a simple\n(mechanical) Hamiltonian system with one degree of freedom\, we f irst illustrate symplecticity\, i.e.\, area preservation in the phase plan e\, of the flow as an underlying structural property\, from which energy c onservation is derived. Consequently\, we give examples for numerical inte gration schemes that are symplectic or energy-conserving.\n\nBoth families of integrators can be used for the definition of discrete-time PH systems \, where the definitions of discrete-time port variables play a fundamenta l role to describe energy transfer over the system boundary. We highlight similarities and differences using the two paths\, in particular based on the discrete-time energy balance equations.\n\nFinally\, we give two examp les from our recent research\, where discrete-time models of geometrically nonlinear systems – elastic continua and beams – are obtained with st ructure-preserving methods.\n LOCATION:https://researchseminars.org/talk/PHSeminar/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Jacquelien Scherpen (RU Groningen) DTSTART:20240531T090000Z DTEND:20240531T100000Z DTSTAMP:20260422T230723Z 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\n\n\nAbstract\nThis talk investiga tes the regulation and trajectory tracking problems for classes of mechani cal and Electromechanical (EM) systems. To this end\, we formulate energy- based models within the port-Hamiltonian (pH) framework. Using the pH fram ework\, we employ standard Lyapunov theory and contraction theory to devel op control approaches with physical interpretation. These methods are rela ted to the well-known Interconnection and Damping Assignment Passivity-Bas ed Control approach. However\, the proposed control methods remove the nee d 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 velocity measure ments from the controllers while rejecting matched and unmatched disturban ces. In addition\, we suggest control approaches specifically using the notion of  coupled damping to enhance the performance of transient respon se and the convergence rate in the EM systems. The applicability of these methods is illustrated via different mechanical and electromechanical appl ications.\n LOCATION:https://researchseminars.org/talk/PHSeminar/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Silke Glas (U Twente) DTSTART:20240703T140000Z DTEND:20240703T150000Z DTSTAMP:20260422T230723Z 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\n\n\nAbstract\nPort-Hamiltonian structures have a perv asive impact in numerous applied domains enlarging the more traditional me chanical one. While these structures are unequivocally characterized in th e continuous-time domain\, several descriptions are proposed in the litera ture when referring to discrete-time or sampled 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 w ith systems without throughput. Exploiting the average passivity property of these forms\, we show how damping feedback and energy-based control str ategies can be designed. Then\, we investigate the sampled-data case and s how how these forms set in discrete-time can be recovered under time-integ ration through modification of the interconnection and dissipation matrice s characterizing the continuous-time dynamics. Some simulations are presen ted 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:20260422T230723Z 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\n\n\nAbstract\nOriginating in macroscopic mechanics\, por t Hamiltonian formulations were proposed and intensively used for the modu lar modelling and control of conservative and dissipative multiphysics sys tems for which the thermal domain does not need to be explicitly represent ed. Yet in many cutting-edge engineering applications\, for example within the field of soft or micro-nano robotics\, process control\, material sci ences\, energy production etc … temperature plays a central role and nee ds to be explicitly taken into account. This class of systems is referred to as Irreversible Thermodynamic systems. Several attempts have been made to extend port Hamiltonian and Lagrangian formulations to Irreversible The rmodynamic systems. Among them\, the Irreversible port Hamiltonian formula tions\, which consider the entropy as additional state variable\, are part icularly promising for their simplicity\, their constructiveness and the a mount 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. conservation of the internal energy and irreversible entropy creation. We then show how the i nterconnection of two controlled lrreversible port Hamiltonian Systems via thermal ports has to be state and co-state modulated in order to ensure t he closed-loop lrreversible port Hamiltonian structure\, satisfying the fi rst and second laws of Thermodynamics. This modulation and closed loop inv ariants are then used to derive efficient controllers via energy shaping a nd entropy assignment. In the second part of this talk we present some rec ent extensions to boundary controlled distributed parameter systems define d on a 1D spatial domain and show\, on the heat equation example\, how sim ilar energy shaping and entropy assignment techniques can be used for cont rol 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:20260422T230723Z 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\n\n\nAbstract\nModel order reduction (MOR) is a powerful tool for reducing the computational effort in applications where a computational mo del needs to be evaluated multiple times\, e.g.\, in control and optimizat ion. MOR aims to replace the full-order model (FOM) by a reduced-order mod el (ROM) which should be cheap to evaluate and sufficiently accurate. In m any applications it is also desirable to preserve important properties of the FOM such as stability or passivity. One possibility to guarantee this preservation is to use MOR schemes which preserve a dissipative or port-Ha miltonian structure. While there are structure-preserving variants of the most common MOR techniques available\, these methods typically lack comput able a priori error bounds and suffer from a loss of accuracy in compariso n to their non-structure-preserving counterparts. Moreover\, these techniq ues are based on linear subspace approximations of the FOM state and such linear approaches usually perform poorly for transport-dominated systems.\ n\nIn the first part of this talk\, we present a structure-preserving bala ncing-based MOR approach which allows to provide computable a priori error bounds. Furthermore\, we demonstrate that the accuracy of the ROM may be significantly improved by replacing the FOM Hamiltonian by another one whi ch is based on an extremal solution of the corresponding Kalman-Yakubovich -Popov inequality. In the second part of this talk\, we address the questi on of how to construct structure-preserving MOR schemes when using a nonli near approximation ansatz\, which is especially relevant in the context of transport-dominated systems. For a special class of nonlinear ansatzes\, we demonstrate that structure-preserving ROMs may be obtained based on a w eighted residual minimization scheme. The effectiveness of the presented a pproaches is demonstrated by means of numerical examples.\n\nThe first par t of this talk is based on joint work with Tobias Breiten and Riccardo Mor andin.\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:20260422T230723Z 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\n\n\nAbstract\nPort-Hamiltonian st ructures 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 descriptions are pr oposed in the literature when referring to discrete-time or sampled dynami cs. In this talk we discuss a description of port-Hamiltonian structures i n discrete time that makes reference to the notion of average passivity\, introduced to deal with systems without throughput. Exploiting the average passivity property of these forms\, we show how damping feedback and ener gy-based control strategies can be designed. Then\, we investigate the sam pled-data case and show how these forms set in discrete-time can be recove red under time-integration through modification of the interconnection and dissipation matrices characterizing the continuous-time dynamics. Some si mulations are presented to illustrate analysis and control performances\n LOCATION:https://researchseminars.org/talk/PHSeminar/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Timo Reis (TU Ilmenau) DTSTART:20241204T150000Z DTEND:20241204T160000Z DTSTAMP:20260422T230723Z 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\n\n\n Abstract\nWe first present a theory for the optimal control of infinite-di mensional systems described by system nodes. In this context\, we focus on minimizing the L^2-norm of the output\, combined with an additional weigh ting of the final state. The input is assumed to lie within a closed and c onvex set.\nNext\, we address energy-optimal control for infinite-dimensio nal port-Hamiltonian systems. We show that minimizing the supplied energy can be reformulated as an equivalent output minimization problem. The theo ry will be illustrated using a boundary control wave equation on a two-dim ensional spatial domain.\n LOCATION:https://researchseminars.org/talk/PHSeminar/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Claudia Totzeck (BU Wuppertal) DTSTART:20250108T150000Z DTEND:20250108T160000Z DTSTAMP:20260422T230723Z 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\n\n\ nAbstract\nWe discuss novel applications of interacting particle systems i n the context of socio-economic applications and reveal their port-Hamilto nian structure\, which can be used to study their long-time behaviour. Mor eover\, we discuss some results of optimal control of interacting particle systems. The theory will be underpinned by numerical simulation results.\ n LOCATION:https://researchseminars.org/talk/PHSeminar/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Thomas Beckers (Vanderbilt University) DTSTART:20240814T140000Z DTEND:20240814T150000Z DTSTAMP:20260422T230723Z 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\n\n\nAbstract\nData-driven approa ches achieve remarkable results for modeling nonlinear systems based on co llected data. However\, these models often neglect basic physical principl es which determine the behavior of any real-world system. This omission is unfavorable in two ways: The models are not as data-efficient as they cou ld be by incorporating physical prior knowledge\, and the model itself mig ht not be physically consistent. \nIn this talk\, I will present our resul ts on physics-constrained Gaussian processes for learning of dynamical sys tem with a focus on the class of electromechanical systems. I will propose Gaussian Process Port-Hamiltonian systems (GP-PHS) as a physics-constrain ed\, nonparametric Bayesian learning approach with uncertainty quantificat ion for ODE and PDE systems with unknown dynamics. \nIn contrast to many p hysics-informed techniques that impose physics by penalty\, the proposed d ata-driven model is physically correct by design. The framework is in part icular suitable for composable learning as its structure can be preserved under interconnection. Finally\, I demonstrate the application of the mode l within a robust control framework to enable safe learning-based control. \n LOCATION:https://researchseminars.org/talk/PHSeminar/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Stefano Stramigioli (U Twente) DTSTART:20250205T150000Z DTEND:20250205T160000Z DTSTAMP:20260422T230723Z UID:PHSeminar/13 DESCRIPTION:Title: The geometry and topology of Ports\nby Stefano Stramigioli (U Twent e) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nIn this lecture the importance of a coordinate invariant description of ports will be given in troducing the mathematical structure of the most general case possible whi ch can be used in a topological setting. As an example of the power of suc h 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:20260422T230723Z UID:PHSeminar/14 DESCRIPTION:Title: Symmetry in linear physical systems\nby Arjan van der Schaft (U Gro ningen) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nPhysical system s with symmetry arise abundantly in applications\, and are endowed with in teresting mathematical structures. In this talk we will focus on reciproca l and input-output Hamiltonian systems. Their characterization 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 th eir Hankel operator\, while input-output Hamiltonian systems are more natu rally approached from a Volterra operator point of view. Geometrically\, i t turns out that both define Lagrangian subspaces with corresponding gener ating functionals. Next\, the close relations with port-Hamiltonian system s and time reversibility will be considered. The system classes under cons ideration are expected to admit scalable control laws\, and to be importan t 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:20260422T230723Z 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\n\n\nAbst ract\nEquations describing Port-Hamiltonian systems come in many forms\, t hey can be ordinary linear or non-linear differential equations\, and even discrete time difference equations. In this presentation we consider port -Hamiltonian systems described by partial differential equations. We show that the Hamiltonian leads to a very natural choice of the state space\, a nd this choice leads to easy checkable conditions for e.g. existence of so lutions. By combining mathematical techniques with the power balance\, pro perties 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:20260422T230723Z 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\n\n\nAbstract\nIn this talk\, we present a reduced-order energy shaping control approach tailored for large-scale linear port-Hamil tonian systems\, such as those arising from distributed parameter models a nd networked structures. We introduce dynamic controllers designed using b oth low-dimensional models and reduced-order models obtained through modal truncation\, ensuring asymptotic stability by leveraging structural invar iants. Special attention is given to shape control applications\, where eq uilibrium points are parametrized through controller parameters\, allowing optimization of the closed-loop configuration accuracy. Additionally\, we discuss stability margins that link reduced-order model properties to tra nsient performance. Practical implementation is illustrated through dynami c shape control of a Mindlin plate\, demonstrating the effectiveness of th e proposed methodology. The talk is based on a joint work with Cristobal P once (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:20260422T230723Z 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\n\n\nAbstract\nIn this talk\, we present a general approach to derive discrete-time approximations of lumped and distributed-parameter p ort-Hamiltonian systems. Since the goal is to preserve passivity\, the key ingredient has been to replace the gradient of the Hamiltonian function t hat appears in the continuous-time dynamics with a discrete gradient. In t his way\, the discrete-time approximation inherits the passivity of the in itial continuous-time dynamics. In finite dimensions\, the result is a sta te equation in implicit form\, while for linear boundary control systems\, we obtain a boundary-value problem to be solved at each step. In both cas es\, the well-posedness of the resulting discrete-time dynamics is discuss ed. Regarding control design\, the continuous-time energy-shaping plus dam ping injection technique is extended to the discrete-time scenario. In the final part of the talk\, we briefly discuss the problem of coupling the d igital controller with the continuous-time plant and the use of such model s 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:20260422T230723Z 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\n\n\nAbst ract\nThis talk illustrates the motivations for using port-Hamiltonian sys tems (PHS) in musical acoustics through two complementary case studies\, o ne elementary and one advanced.\nThe first part shows how the basic tools of the PHS framework can already be used to construct the simplest passive prototype of self-oscillating instrument\, with the aim of making explici t the fundamental mechanisms of energy exchange and auto-oscillation. \nTh e second part addresses a more advanced scenario\, where homogenisation me thods are combined with port-Hamiltonian formulations to describe infinite -dimensional dynamics\, exemplified by acoustic propagation in a pipe with a porous wall. Together\, these two perspectives illustrate the range of modelling possibilities offered by the port-Hamiltonian framework\, from e lementary 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:20260422T230723Z UID:PHSeminar/19 DESCRIPTION:Title: Passivity-based control of mechanical systems\nby Pablo Borja (U Pl ymouth) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nMechanical syst ems are crucial in sectors such as construction\, manufacturing\, and tran sportation\, where relevant examples of these systems include cranes\, rob ots\, and autonomous vehicles. This talk discusses some intuitive control design methods for mechanical systems. Such strategies are based on exploi ting the port-Hamiltonian structure of these systems and their passivity p roperty.\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:20260422T230723Z 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\n\n\nAbstract\nIn this talk we address th e time discretization of port-Hamiltonian (pH) differential-algebraic equa tions (DAE). This combines the challenges of discretizing a DAE consistent ly\, and preserving the pH properties\, two tasks which are nontrivial 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 methods\, with a particular focus on semi-explicit pHDAEs. This talk includes 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:20260422T230723Z UID:PHSeminar/21 DESCRIPTION:Title: Model Reduction for port-Hamiltonian System\nby Serkan Gugercin (Vi rginia Tech) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nThis talk provides a brief introduction to the fundamentals of model reduction\, hig hlighting why reduced models are essential for large-scale dynamical syste ms. We will focus on interpolatory model reduction methods\, outlining the ir key ideas and their connection to optimal approximation in the H2 norm. We then demonstrate how these techniques can be extended to model reducti on of port-Hamiltonian systems\, enabling structure-preserving\, 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:20260422T230723Z 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\n\n\nAbstract\nIn this talk\, we explore several ways to leverage (port-)Hamiltonian structures in the solution of optimal cont rol problems.\n\nWe first present a novel time-domain decomposition strate gy. Therein\, the optimality system is formulated as a sum of dissipative operators\, which enables a Peaceman–Rachford and Dougla-Rachford-type f ixed-point iterations in function space. The resulting subproblems corresp ond to local optimal control problems on shorter time horizons and can be solved in parallel. Using the dissipativity of the formulation\, we establ ish convergence of the method.\n\nIn the second part\, we focus on tailore d iterative solvers for linear systems arising from the discretization of port-Hamiltonian optimal control problems. In particular\, we will inspect Krylov subspace methods that utilize the symmetric part of the operator a s a preconditioner to guarantee mesh-independent convergence.\n\nWe illust rate our results by means of various large-scale problems from fluid mecha nics\, 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:20260422T230723Z UID:PHSeminar/33 DESCRIPTION:Title: Discretization of port-Hamiltonian systems\nby Kirsten Morris (Univ ersity of waterloo) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nCon troller design for distributed parameter systems is often accomplished usi ng a lumped approximation. For a system that is exponentially stable\, it is reasonable to expect the approximation to preserve this decay rate. Pre servation of the decay rate is important for realistic simulations and als o for reliable controller design. An example illustrating the problems tha t can occur even in a simple problem will be given. It will be shown that a number of standard methods - not all - are structure-preserving for a c lass of port-Hamiltonian systems. Most importantly\, when these systems ar e exponentially stable\, a uniform decay rate is preserved by the approxim ations. The method is to show that a modification of the energy yields a L yapunov function. The results are illustrated with simulations of an exa mple 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:20260422T230723Z UID:PHSeminar/34 DESCRIPTION:Title: System identification of port-Hamiltonian systems\nby Karim Cherifi (Femto-ST) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nSystem iden tification is essential in modeling\, analysis\, and control of dynamical systems\, particularly when first-principles models are incomplete or unav ailable. In this talk\, we begin with a brief introduction to system ident ification\, outlining its main objectives\, challenges. We then focus on s tructured modeling frameworks\, with particular emphasis on port-Hamiltoni an systems\, which have attracted significant attention due to their stron g ties to physics\, energy-based interpretation\, and interesting properti es for control and stability analysis. We study system identification unde r explicit structural and physical constraints\, using the port-Hamiltonia n formalism as a unifying framework\, starting with the identification of linear port-Hamiltonian systems\, and highlighting how structure-preservin g approaches can be leveraged to recover physically consistent models from data. We then move to nonlinear port-Hamiltonian systems and discuss rece nt methods that enable their learning from data\, including generalization s to higher-order and more complex systems through neural scaling laws. Th e talk concludes with a discussion of current research directions\, includ ing recently proposed architectures for learning port-Hamiltonian systems. \n LOCATION:https://researchseminars.org/talk/PHSeminar/34/ END:VEVENT BEGIN:VEVENT SUMMARY:Carsten Hartmann (BTU Cottbus-Senftenberg) DTSTART:20260506T140000Z DTEND:20260506T150000Z DTSTAMP:20260422T230723Z 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\n\n\nAbstract\nThe realisation of constraints by st rong confining forces is a classical theme in mechanics. Recently\, there has been a growing interest in studying constrained stochastic differentia l equations\, due to their relevance in molecular dynamics\, power network modelling\, or machine learning. \n\nIn this talk\, we will discuss the r ealisation of algebraic constraints on so-called underdamped Langevin syst ems that are a special kind of stochastic port-Hamiltonian systems\, the k ey property being that the noise coefficient is degenerate and acts only o n those states that are subject to friction. Physically\, constraints can be realised by different mechanisms\, such as strong forces or large frict ion\, but also small or large masses. We will discuss limit theorems for s everal of these confinement mechanisms from both physical and mathematical perspective\, including quantitative convergence results. It turns out th at some of the confinement mechanisms provide uniform-in-time approximatio ns of the limiting differential-algebraic (i.e. constrained) system\, but others do not\, and we will explain why this observation is relevant for M onte-Carlo sampling of high-dimensional probability distributions. \n\nThi s is joint work with Lara Neureither (Cottbus) and Upanshu Sharma (Sydney) .\n\nReferences: \n\n[1] Hartmann\, C.\, Neureither\, L.\, & Sharma\, U. ( 2025). Affine constraints in non-reversible diffusions with degenerate noi se. 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:2604.02129.\n LOCATION:https://researchseminars.org/talk/PHSeminar/35/ END:VEVENT BEGIN:VEVENT SUMMARY:Federico Califano (University of Twente) DTSTART:20260304T150000Z DTEND:20260304T160000Z DTSTAMP:20260422T230723Z 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\n\n\nAbs tract\nPort-Hamiltonian (pH) systems have gained extreme popularity in the last 3 decades in different fields. As examples\, mathematicians use pH f ormulations to assess well-posedeness of partial differential equations\, data-scientists and numerical engineers exploit pH formulations to develop structure-preserving integrators\, physicist acknowledge pH theory as an insightful extension of Hamiltonian dynamics\, and system theorists use pH formulations for modelling and control purposes.\n\nPH theory is being st udied by different communities from different angles and at different leve ls of abstraction. As examples\, some see pH systems as particular cases o f differential equations with inputs\, and some identify pH systems with a bstract underlying geometric structures which are hard to grasp without a formal mathematical training. \n\nOften this plurality of vision in unders tanding pH systems\, as well as the relatively young age of the topic\, ca n cause confusion in scientists and engineers approaching the topic.\n\nTh is seminar wants to provide a synthesis of the deep meaning of pH systems\ , general enough to embrace the plurality of ways the topic can be approac hed\, and focalised enough to transmit the common seed constituting the he arth 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:20260422T230723Z UID:PHSeminar/37 DESCRIPTION:by Anthony Hastir (University of Namur) as part of Port-Hamilt onian 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:20260422T230723Z UID:PHSeminar/38 DESCRIPTION:Title: Linear algebra of dissipative Hamiltonian systems.\nby Michal Wojty lak (agiellonian University) as part of Port-Hamiltonian Seminar\n\n\nAbst ract\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 di fferent 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 Krone cker block - the index. \nWe will study the perturbation properties of t he eigenvalue infinity\, presenting non-asymptotic results based on the Ba uer-Fike theorem\, see [4]. Several numerical examples will be considere d.\n\n[1] C. Mehl\, V. Mehrmann\, and M. Wojtylak. Matrix pencils with coe fficients that have positive\nsemidefinite Hermitian parts. SIMAX 2022. \n \n[2] N. Gillis\, V. Mehrmann\, and P. Sharma. Computing the nearest stab le matrix pairs. NLAA\, 2018.\n\n[3] K. Cherifi\, H. Gernandt\, and D. Hin sen. The difference between port-Hamiltonian\, passive and\npositive real descriptor systems. MCSS\, 2024.\n\n[4] H. Blazhko\, M. Wojtylak\, Detect ion of the higher order Kronecker blocks by perturbation\, 2026 \, preprin t.\n LOCATION:https://researchseminars.org/talk/PHSeminar/38/ END:VEVENT END:VCALENDAR