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:20260404T110911Z UID:PHSeminar/1 DESCRIPTION:Title: Port-Hamiltonian systems: algebraic\, geometric and operator theo retic representations\nby Volker Mehrmann (TU Berlin) as part of Port- Hamiltonian Seminar\n\n\nAbstract\nDifferent representations of dissipativ e Hamiltonian and port-Hamiltonian differential-algebraic equations (DAE) systems are presented and compared. Using global geometric and algebraic p oints of view\, translations between the different representations are pre sented. The results also apply in the Hilbert space setting of linear oper ator equations. Characterizations are also derived when a general DAE syst em can be transformed into one of these structured representations. Approa ches for computing the structural information and the described transforma tions are derived that can be directly implemented as numerical methods. T he results 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://stable.researchseminars.org/talk/PHSeminar/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Denis Matignon (ISAE-SUPAERO\, Toulouse) DTSTART:20240306T150000Z DTEND:20240306T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/2 DESCRIPTION:Title: The partitioned finite element method for port-Hamiltonian system s: a structure-preserving discretization for boundary controlled wave and heat PDEs\nby Denis Matignon (ISAE-SUPAERO\, Toulouse) as part of Port -Hamiltonian Seminar\n\n\nAbstract\nBoundary controlled and observed wave and heat PDEs can be recast as port-Hamiltonian systems on an n-D domain\, 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 discre te level: this will be introduced with a primer on the finite element meth od (FEM)\; then\, some optimal convergence results will be provided and il lustrated on the 2D inhomogeneous and anisotropic wave equation.\n\nFinall y\, the effectiveness of PFEM will finally be illustrated when capturing r efined asymptotic behaviours of the coupled heat-wave PDE system in differ ent geometric configurations.\n\nJoint work partly with Ghislain Haine.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Bernhard Maschke (U Claude Bernard Lyon 1Lyon) DTSTART:20240403T140000Z DTEND:20240403T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/3 DESCRIPTION:Title: The geometry of the state space of physical systems and the conse quences on the definition of Port-Hamiltonian systems\nby Bernhard Mas chke (U Claude Bernard Lyon 1Lyon) as part of Port-Hamiltonian Seminar\n\n \nAbstract\nIn the first part\, we recall the geometric structure of the s tate space of physical systems. Indeed\, for Thermodynamical systems\, it is well accepted that the system is first defined by its so-called equilib rium properties. These properties are defined by a set of relations among the extensive and intensive variables\, the Thermodynamic Phase variables\ , which should satisfy the Gibbs' equations. Actually Gibbs' equations def ine a Legendre submanifold of the Thermodynamic Phase Space which is gener ated by a family of functions\, called thermodynamic functions. This Legen dre submanifolds actually defines the state space of the system.\n\nA simi lar construction holds for Hamiltonian systems arising for mechanical syst ems or electro-mechanical systems' models\, when instead of defining a Ham iltonian function\, one considers the reciprocal constitutive relations re lating the energy and the co-energy variables. These reciprocal relations define a Lagrangian submanifold of the cotangent space of the energy varia bles (the space of energy and the co-energy variables).\n\nIn the second p art of the talk\, we shall draw the consequence of the definition of the s tate space Lagrange or Legendre submanifolds for Hamiltonian and port Hami ltonian systems. Indeed\, defining the state space as a submanifold of som e phase space\, corresponds to an implicit definition of the Hamiltonian d ynamics. For irreversible Thermodynamic systems\, one defines a contact Ha miltonian system on the Thermodynamic Phase Space\, leaving invariant some Legendre submanifold. For Hamiltonian systems defined on Lagrange submani folds\, one defines a implicit Hamiltonian system restricted to some Lagra nge submanifold.\n\nWe shall finally present some ongoing work\, how this geometric perspective of the state space of physical systems\, leads to de fine a novel class of Port Hamiltonian systems equipped with a new type of port variables\, derived from the definition of Lagrange or Legendre subm anifolds. We shall illustrate the work with various simple examples taken from physical and engineering systems.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Paul Kotyczka (TU Munich) DTSTART:20240508T140000Z DTEND:20240508T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/4 DESCRIPTION:Title: Geometric integration and discrete-time port-Hamiltonian systems< /a>\nby Paul Kotyczka (TU Munich) as part of Port-Hamiltonian Seminar\n\n\ nAbstract\nThe interest of this talk is to show possibilities to preserve “structure” when continuous-time port-Hamiltonian (PH) models are tran slated via numerical integration to the discrete-time domain. On the examp le of a simple\n(mechanical) Hamiltonian system with one degree of freedom \, we first illustrate symplecticity\, i.e.\, area preservation in the pha se plane\, of the flow as an underlying structural property\, from which e nergy conservation is derived. Consequently\, we give examples for numeric al integration schemes that are symplectic or energy-conserving.\n\nBoth f amilies of integrators can be used for the definition of discrete-time PH systems\, where the definitions of discrete-time port variables play a fun damental role to describe energy transfer over the system boundary. We hig hlight similarities and differences using the two paths\, in particular ba sed on the discrete-time energy balance equations.\n\nFinally\, we give tw o examples from our recent research\, where discrete-time models of geomet rically nonlinear systems – elastic continua and beams – are obtained with structure-preserving methods.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Jacquelien Scherpen (RU Groningen) DTSTART:20240531T090000Z DTEND:20240531T100000Z DTSTAMP:20260404T110911Z UID:PHSeminar/5 DESCRIPTION:Title: Contraction\, regulation\, trajectory tracking and coupled dampin g for classes of port-Hamiltonian systems\nby Jacquelien Scherpen (RU Groningen) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nThis talk in vestigates the regulation and trajectory tracking problems for classes of mechanical and Electromechanical (EM) systems. To this end\, we formulate energy-based models within the port-Hamiltonian (pH) framework. Using the pH framework\, we employ standard Lyapunov theory and contraction theory t o develop control approaches with physical interpretation. These methods a re related to the well-known Interconnection and Damping Assignment Passiv ity-Based Control approach. However\, the proposed control methods remove the need for solving partial differential equations or implementing any ch ange of coordinates. In detail\, in the case of mechanical systems\, we p ropose control design methods using dynamic extensions to remove velocity measurements from the controllers while rejecting matched and unmatched di sturbances. In addition\, we suggest control approaches specifically usi ng the notion of  coupled damping to enhance the performance of transient response and the convergence rate in the EM systems. The applicability of these methods is illustrated via different mechanical and electromechanic al applications.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Silke Glas (U Twente) DTSTART:20240703T140000Z DTEND:20240703T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/6 DESCRIPTION:Title: Model Reduction on Manifolds: from a differential geometric formu lation to data-driven realizations\nby Silke Glas (U Twente) as part o f Port-Hamiltonian Seminar\n\n\nAbstract\nPort-Hamiltonian structures have a pervasive impact in numerous applied domains enlarging the more traditi onal mechanical one. While these structures are unequivocally characterize d in the continuous-time domain\, several descriptions are proposed in the literature when referring to discrete-time or sampled dynamics. In this t alk we discuss a description of port-Hamiltonian structures in discrete ti me that makes reference to the notion of average passivity\, introduced to deal with systems without throughput. Exploiting the average passivity pr operty of these forms\, we show how damping feedback and energy-based cont rol strategies can be designed. Then\, we investigate the sampled-data cas e and show how these forms set in discrete-time can be recovered under tim e-integration through modification of the interconnection and dissipation matrices characterizing the continuous-time dynamics. Some simulations are presented to illustrate analysis and control performances.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Yann Le Gorrec (FEMTO-ST\, Besançon) DTSTART:20240911T140000Z DTEND:20240911T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/7 DESCRIPTION:Title: Modelling\, interconnection and control of irreversible port Hami ltonian systems\nby Yann Le Gorrec (FEMTO-ST\, Besançon) as part of P ort-Hamiltonian Seminar\n\n\nAbstract\nOriginating in macroscopic mechanic s\, port Hamiltonian formulations were proposed and intensively used for t he modular modelling and control of conservative and dissipative multiphys ics systems for which the thermal domain does not need to be explicitly re presented. Yet in many cutting-edge engineering applications\, for example within the field of soft or micro-nano robotics\, process control\, mater ial sciences\, energy production etc … temperature plays a central role and needs to be explicitly taken into account. This class of systems is re ferred to as Irreversible Thermodynamic systems. Several attempts have bee n made to extend port Hamiltonian and Lagrangian formulations to Irreversi ble Thermodynamic systems. Among them\, the Irreversible port Hamiltonian formulations\, which consider the entropy as additional state variable\, a re particularly promising for their simplicity\, their constructiveness an d the amount of information they can encode.\n\nIn the first part of this talk we recall some definitions and properties of finite dimensional Irrev ersible port Hamiltonian systems. We show how this structure allows to cop e with the first and second principles of Thermodynamics i.e. conservation of the internal energy and irreversible entropy creation. We then show ho w the interconnection of two controlled lrreversible port Hamiltonian Syst ems via thermal ports has to be state and co-state modulated in order to e nsure the closed-loop lrreversible port Hamiltonian structure\, satisfying the first and second laws of Thermodynamics. This modulation and closed l oop invariants are then used to derive efficient controllers via energy sh aping and entropy assignment. In the second part of this talk we present s ome recent extensions to boundary controlled distributed parameter systems defined on a 1D spatial domain and show\, on the heat equation example\, how similar energy shaping and entropy assignment techniques can be used f or control design.\n\nThis talk is based on a joint work with Hector Ramir ez and Bernhard Maschke.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Philipp Schulze (TU Berlin) DTSTART:20241002T140000Z DTEND:20241002T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/8 DESCRIPTION:Title: Structure-Preserving Model Reduction for Dissipative and Port-Ham iltonian Systems\nby Philipp Schulze (TU Berlin) as part of Port-Hamil tonian Seminar\n\n\nAbstract\nModel order reduction (MOR) is a powerful to ol for reducing the computational effort in applications where a computati onal model needs to be evaluated multiple times\, e.g.\, in control and op timization. MOR aims to replace the full-order model (FOM) by a reduced-or der model (ROM) which should be cheap to evaluate and sufficiently accurat e. In many applications it is also desirable to preserve important propert ies of the FOM such as stability or passivity. One possibility to guarante e this preservation is to use MOR schemes which preserve a dissipative or port-Hamiltonian structure. While there are structure-preserving variants of the most common MOR techniques available\, these methods typically lack computable a priori error bounds and suffer from a loss of accuracy in co mparison to their non-structure-preserving counterparts. Moreover\, these techniques are based on linear subspace approximations of the FOM state an d such linear approaches usually perform poorly for transport-dominated sy stems.\n\nIn the first part of this talk\, we present a structure-preservi ng balancing-based MOR approach which allows to provide computable a prior i error bounds. Furthermore\, we demonstrate that the accuracy of the ROM may be significantly improved by replacing the FOM Hamiltonian by another one which is based on an extremal solution of the corresponding Kalman-Yak ubovich-Popov inequality. In the second part of this talk\, we address the question of how to construct structure-preserving MOR schemes when using a nonlinear approximation ansatz\, which is especially relevant in the con text of transport-dominated systems. For a special class of nonlinear ansa tzes\, we demonstrate that structure-preserving ROMs may be obtained based on a weighted residual minimization scheme. The effectiveness of the pres ented approaches is demonstrated by means of numerical examples.\n\nThe fi rst part of this talk is based on joint work with Tobias Breiten and Ricca rdo Morandin.\n LOCATION:https://stable.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:20260404T110911Z UID:PHSeminar/9 DESCRIPTION:Title: About a class of discrete-time and sampled-data Hamiltonian struc tures\nby Dorothée Normand-Cyrot (Laboratoire des Signaux et Système s\, Paris) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nPort-Hamilto nian structures have a pervasive impact in numerous applied domains enlarg ing the more traditional mechanical one. While these structures are unequi vocally characterized 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 struc tures in discrete time that makes reference to the notion of average passi vity\, introduced to deal with systems without throughput. Exploiting the average passivity property of these forms\, we show how damping feedback a nd energy-based control strategies can be designed. Then\, we investigate the sampled-data case and show how these forms set in discrete-time can be recovered under time-integration through modification of the interconnect ion and dissipation matrices characterizing the continuous-time dynamics. Some simulations are presented to illustrate analysis and control performa nces\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Timo Reis (TU Ilmenau) DTSTART:20241204T150000Z DTEND:20241204T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/10 DESCRIPTION:Title: Energy-Optimal Control for infinite-dimensional port-Hamiltonian Systems\nby Timo Reis (TU Ilmenau) as part of Port-Hamiltonian Semina r\n\n\nAbstract\nWe first present a theory for the optimal control of infi nite-dimensional systems described by system nodes. In this context\, we f ocus on minimizing the L^2-norm of the output\, combined with an additiona l weighting of the final state. The input is assumed to lie within a close d and convex set.\nNext\, we address energy-optimal control for infinite-d imensional port-Hamiltonian systems. We show that minimizing the supplied energy can be reformulated as an equivalent output minimization problem. T he theory will be illustrated using a boundary control wave equation on a two-dimensional spatial domain.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Claudia Totzeck (BU Wuppertal) DTSTART:20250108T150000Z DTEND:20250108T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/11 DESCRIPTION:Title: On the port-Hamiltonian structure of interacting particle system s\nby Claudia Totzeck (BU Wuppertal) as part of Port-Hamiltonian Semin ar\n\n\nAbstract\nWe discuss novel applications of interacting particle sy stems in the context of socio-economic applications and reveal their port- Hamiltonian structure\, which can be used to study their long-time behavio ur. Moreover\, we discuss some results of optimal control of interacting p article systems. The theory will be underpinned by numerical simulation re sults.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Thomas Beckers (Vanderbilt University) DTSTART:20240814T140000Z DTEND:20240814T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/12 DESCRIPTION:Title: Composable Physics-Informed Learning with Uncertainty Quantifica tion based on Port-Hamiltonian systems\nby Thomas Beckers (Vanderbilt University) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nData-driven approaches achieve remarkable results for modeling nonlinear systems base d on collected data. However\, these models often neglect basic physical p rinciples which determine the behavior of any real-world system. This omis sion is unfavorable in two ways: The models are not as data-efficient as t hey could be by incorporating physical prior knowledge\, and the model its elf might not be physically consistent. \nIn this talk\, I will present ou r results on physics-constrained Gaussian processes for learning of dynami cal system with a focus on the class of electromechanical systems. I will propose Gaussian Process Port-Hamiltonian systems (GP-PHS) as a physics-co nstrained\, nonparametric Bayesian learning approach with uncertainty quan tification for ODE and PDE systems with unknown dynamics. \nIn contrast to many physics-informed techniques that impose physics by penalty\, the pro posed data-driven model is physically correct by design. The framework is in particular suitable for composable learning as its structure can be pre served under interconnection. Finally\, I demonstrate the application of t he model within a robust control framework to enable safe learning-based c ontrol.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Stefano Stramigioli (U Twente) DTSTART:20250205T150000Z DTEND:20250205T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/13 DESCRIPTION:Title: The geometry and topology of Ports\nby Stefano Stramigioli ( U Twente) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nIn this lectu re the importance of a coordinate invariant description of ports will be g iven introducing the mathematical structure of the most general case possi ble 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 prese nted\, also relating to non-linear elasticity.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Arjan van der Schaft (U Groningen) DTSTART:20250402T140000Z DTEND:20250402T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/14 DESCRIPTION:Title: Symmetry in linear physical systems\nby Arjan van der Schaft (U Groningen) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nPhysical systems with symmetry arise abundantly in applications\, and are endowed with interesting mathematical structures. In this talk we will focus on re ciprocal and input-output Hamiltonian systems. Their characterization is s tudied 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 kerne l of their Hankel operator\, while input-output Hamiltonian systems are mo re naturally approached from a Volterra operator point of view. Geometrica lly\, it turns out that both define Lagrangian subspaces with correspondin g generating functionals. Next\, the close relations with port-Hamiltonian systems and time reversibility will be considered. The system classes und er consideration are expected to admit scalable control laws\, and to be i mportant building blocks in control design.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Hans Zwart (U Twente) DTSTART:20250305T150000Z DTEND:20250305T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/15 DESCRIPTION:Title: An introductory talk on infinite dimensional port-Hamiltonian sy stems\nby Hans Zwart (U Twente) as part of Port-Hamiltonian Seminar\n\ n\nAbstract\nEquations describing Port-Hamiltonian systems come in many fo rms\, they can be ordinary linear or non-linear differential equations\, a nd even discrete time difference equations. In this presentation we consid er port-Hamiltonian systems described by partial differential equations. W e show that the Hamiltonian leads to a very natural choice of the state sp ace\, and this choice leads to easy checkable conditions for e.g. existenc e of solutions. By combining mathematical techniques with the power balanc e\, properties like stability can be shown.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Hector Ramirez Estay (Valparaiso) DTSTART:20250507T140000Z DTEND:20250507T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/16 DESCRIPTION:Title: Reduced-order energy shaping control of large-scale linear port- Hamiltonian systems\nby Hector Ramirez Estay (Valparaiso) as part of P ort-Hamiltonian Seminar\n\n\nAbstract\nIn this talk\, we present a reduced -order energy shaping control approach tailored for large-scale linear por t-Hamiltonian systems\, such as those arising from distributed parameter m odels and networked structures. We introduce dynamic controllers designed using both low-dimensional models and reduced-order models obtained throug h modal truncation\, ensuring asymptotic stability by leveraging structura l invariants. Special attention is given to shape control applications\, w here equilibrium points are parametrized through controller parameters\, a llowing optimization of the closed-loop configuration accuracy. Additional ly\, we discuss stability margins that link reduced-order model properties to transient performance. Practical implementation is illustrated through dynamic shape control of a Mindlin plate\, demonstrating the effectivenes s of the proposed methodology. The talk is based on a joint work with Cris tobal Ponce (AC3E\, Chile) and Yann Le Gorrec (FEMTO-ST\, France).\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Alessandro Macchelli (U Bologna) DTSTART:20250604T140000Z DTEND:20250604T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/17 DESCRIPTION:Title: A Class of Discrete-Time Port-Hamiltonian Systems. Modelling and Control Design\nby Alessandro Macchelli (U Bologna) as part of Port-H amiltonian Seminar\n\n\nAbstract\nIn this talk\, we present a general appr oach to derive discrete-time approximations of lumped and distributed-para meter port-Hamiltonian systems. Since the goal is to preserve passivity\, the key ingredient has been to replace the gradient of the Hamiltonian fun ction that appears in the continuous-time dynamics with a discrete gradien t. In this way\, the discrete-time approximation inherits the passivity of the initial continuous-time dynamics. In finite dimensions\, the result i s a state equation in implicit form\, while for linear boundary control sy stems\, we obtain a boundary-value problem to be solved at each step. In b oth cases\, the well-posedness of the resulting discrete-time dynamics is discussed. Regarding control design\, the continuous-time energy-shaping p lus damping injection technique is extended to the discrete-time scenario. In the final part of the talk\, we briefly discuss the problem of couplin g the digital controller with the continuous-time plant and the use of suc h models in a model predictive control scheme.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/17/ END:VEVENT BEGIN:VEVENT SUMMARY:Thomas Hélie (IRCAM Paris) DTSTART:20251001T140000Z DTEND:20251001T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/18 DESCRIPTION:Title: Two focuses on the use of Port-Hamiltonian in Musical acoustics< /a>\nby Thomas Hélie (IRCAM Paris) as part of Port-Hamiltonian Seminar\n\ n\nAbstract\nThis talk illustrates the motivations for using port-Hamilton ian systems (PHS) in musical acoustics through two complementary case stud ies\, one 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 explicit the fundamental mechanisms of energy exchange and auto-oscillatio n. \nThe second part addresses a more advanced scenario\, where homogenisa tion methods are combined with port-Hamiltonian formulations to describe i nfinite-dimensional dynamics\, exemplified by acoustic propagation in a pi pe with a porous wall. Together\, these two perspectives illustrate the ra nge of modelling possibilities offered by the port-Hamiltonian framework\, from elementary prototypes to sophisticated multiscale descriptions.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/18/ END:VEVENT BEGIN:VEVENT SUMMARY:Pablo Borja (U Plymouth) DTSTART:20250702T140000Z DTEND:20250702T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/19 DESCRIPTION:Title: Passivity-based control of mechanical systems\nby Pablo Borj a (U Plymouth) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nMechanic al systems are crucial in sectors such as construction\, manufacturing\, a nd transportation\, where relevant examples of these systems include crane s\, robots\, and autonomous vehicles. This talk discusses some intuitive c ontrol design methods for mechanical systems. Such strategies are based on exploiting the port-Hamiltonian structure of these systems and their pass ivity property.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/19/ END:VEVENT BEGIN:VEVENT SUMMARY:Riccardo Morandin (Otto-von-Guericke-Universität Magdeburg) DTSTART:20250903T140000Z DTEND:20250903T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/20 DESCRIPTION:Title: Time discretization of port-Hamiltonian differential-algebraic e quations\nby Riccardo Morandin (Otto-von-Guericke-Universität Magdebu rg) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nIn this talk we add ress the time discretization of port-Hamiltonian (pH) differential-algebra ic equations (DAE). This combines the challenges of discretizing a DAE con sistently\, and preserving the pH properties\, two tasks which are nontriv ial to fulfill at the same time. In particular\, we will discuss the appli cation of Runge-Kutta methods\, among which collocation methods are treate d as a special case\, discrete gradient methods\, and partitioned methods\ , with a particular focus on semi-explicit pHDAEs. This talk includes join t work with Philipp Kinon\, Volker Mehrmann\, and Philipp Schulze.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/20/ END:VEVENT BEGIN:VEVENT SUMMARY:Serkan Gugercin (Virginia Tech) DTSTART:20251203T150000Z DTEND:20251203T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/21 DESCRIPTION:Title: Model Reduction for port-Hamiltonian System\nby Serkan Guger cin (Virginia Tech) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nThi s talk provides a brief introduction to the fundamentals of model reductio n\, highlighting why reduced models are essential for large-scale dynamica l systems. We will focus on interpolatory model reduction methods\, outlin ing their key ideas and their connection to optimal approximation in the H 2 norm. We then demonstrate how these techniques can be extended to model reduction of port-Hamiltonian systems\, enabling structure-preserving\, ef ficient\, and accurate reduced-order representations.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/21/ END:VEVENT BEGIN:VEVENT SUMMARY:Manuel Schaller (TU Chemnitz) DTSTART:20251105T150000Z DTEND:20251105T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/22 DESCRIPTION:Title: Exploiting port-Hamiltonian and dissipative structures in numeri cal optimal control of PDEs\nby Manuel Schaller (TU Chemnitz) as part of Port-Hamiltonian Seminar\n\n\nAbstract\nIn this talk\, we explore sever al ways to leverage (port-)Hamiltonian structures in the solution of optim al control problems.\n\nWe first present a novel time-domain decomposition strategy. Therein\, the optimality system is formulated as a sum of dissi pative operators\, which enables a Peaceman–Rachford and Dougla-Rachford -type fixed-point iterations in function space. The resulting subproblems correspond to local optimal control problems on shorter time horizons and can be solved in parallel. Using the dissipativity of the formulation\, we establish convergence of the method.\n\nIn the second part\, we focus on tailored iterative solvers for linear systems arising from the discretizat ion of port-Hamiltonian optimal control problems. In particular\, we will inspect Krylov subspace methods that utilize the symmetric part of the ope rator as a preconditioner to guarantee mesh-independent convergence.\n\nWe illustrate our results by means of various large-scale problems from flui d mechanics\, elasticity or advection-diffusion phenomena.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/22/ END:VEVENT BEGIN:VEVENT SUMMARY:Kirsten Morris (University of waterloo) DTSTART:20260204T150000Z DTEND:20260204T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/33 DESCRIPTION:Title: Discretization of port-Hamiltonian systems\nby Kirsten Morri s (University of waterloo) as part of Port-Hamiltonian Seminar\n\n\nAbstra ct\nController design for distributed parameter systems is often accomplis hed using a lumped approximation. For a system that is exponentially stabl e\, it is reasonable to expect the approximation to preserve this decay ra te. Preservation of the decay rate is important for realistic simulations and also for reliable controller design. An example illustrating the probl ems that can occur even in a simple problem will be given. It will be sho wn that a number of standard methods - not all - are structure-preserving for a class of port-Hamiltonian systems. Most importantly\, when these sys tems are exponentially stable\, a uniform decay rate is preserved by the a pproximations. The method is to show that a modification of the energy yie lds a Lyapunov function. The results are illustrated with simulations of an example of LQ-optimal controller design.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/33/ END:VEVENT BEGIN:VEVENT SUMMARY:Karim Cherifi (Femto-ST) DTSTART:20260114T150000Z DTEND:20260114T160000Z DTSTAMP:20260404T110911Z 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\nSyst em identification is essential in modeling\, analysis\, and control of dyn amical systems\, particularly when first-principles models are incomplete or unavailable. In this talk\, we begin with a brief introduction to syste m identification\, outlining its main objectives\, challenges. We then foc us on structured modeling frameworks\, with particular emphasis on port-Ha miltonian systems\, which have attracted significant attention due to thei r strong ties to physics\, energy-based interpretation\, and interesting p roperties for control and stability analysis. We study system identificati on under explicit structural and physical constraints\, using the port-Ham iltonian formalism as a unifying framework\, starting with the identificat ion of linear port-Hamiltonian systems\, and highlighting how structure-pr eserving approaches can be leveraged to recover physically consistent mode ls from data. We then move to nonlinear port-Hamiltonian systems and discu ss recent methods that enable their learning from data\, including general izations to higher-order and more complex systems through neural scaling l aws. The talk concludes with a discussion of current research directions\, including recently proposed architectures for learning port-Hamiltonian s ystems.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/34/ END:VEVENT BEGIN:VEVENT SUMMARY:Carsten Hartmann (BTU Cottbus-Senftenberg) DTSTART:20260506T140000Z DTEND:20260506T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/35 DESCRIPTION:by Carsten Hartmann (BTU Cottbus-Senftenberg) as part of Port- Hamiltonian Seminar\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/35/ END:VEVENT BEGIN:VEVENT SUMMARY:Federico Califano (University of Twente) DTSTART:20260304T150000Z DTEND:20260304T160000Z DTSTAMP:20260404T110911Z UID:PHSeminar/36 DESCRIPTION:Title: A geometric perspective on port-Hamiltonian systems\nby Fede rico Califano (University of Twente) as part of Port-Hamiltonian Seminar\n \n\nAbstract\nPort-Hamiltonian (pH) systems have gained extreme popularity in the last 3 decades in different fields. As examples\, mathematicians u se pH formulations to assess well-posedeness of partial differential equat ions\, 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 b eing studied by different communities from different angles and at differe nt levels of abstraction. As examples\, some see pH systems as particular cases of differential equations with inputs\, and some identify pH systems with abstract underlying geometric structures which are hard to grasp wit hout a formal mathematical training. \n\nOften this plurality of vision in understanding pH systems\, as well as the relatively young age of the top ic\, can cause confusion in scientists and engineers approaching the topic .\n\nThis seminar wants to provide a synthesis of the deep meaning of pH s ystems\, general enough to embrace the plurality of ways the topic can be approached\, and focalised enough to transmit the common seed constituting the hearth of pH theory.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/36/ END:VEVENT BEGIN:VEVENT SUMMARY:Anthony Hastir (University of Namur) DTSTART:20260603T140000Z DTEND:20260603T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/37 DESCRIPTION:by Anthony Hastir (University of Namur) as part of Port-Hamilt onian Seminar\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/37/ END:VEVENT BEGIN:VEVENT SUMMARY:Michal Wojtylak (agiellonian University) DTSTART:20260401T140000Z DTEND:20260401T150000Z DTSTAMP:20260404T110911Z UID:PHSeminar/38 DESCRIPTION:Title: Linear algebra of dissipative Hamiltonian systems.\nby Micha l Wojtylak (agiellonian University) as part of Port-Hamiltonian Seminar\n\ n\nAbstract\nWe will begin with a review of the Kronecker of pencils appea ring in the port Hamiltonian modelling. Although the task seems to be co mpleted by [1]\, and [2]\, the transfer function considerations in [3] p ut a different light on these results.\n\nIn the second part of the talk w e will concentrate on the eigenvalue infinity\, and the size of the larges t Kronecker block - the index. \nWe will study the perturbation properti es of the eigenvalue infinity\, presenting non-asymptotic results based on the Bauer-Fike theorem\, see [4]. Several numerical examples will be co nsidered.\n\n[1] C. Mehl\, V. Mehrmann\, and M. Wojtylak. Matrix pencils w ith coefficients that have positive\nsemidefinite Hermitian parts. SIMAX 2 022. \n\n[2] N. Gillis\, V. Mehrmann\, and P. Sharma. Computing the neare st stable matrix pairs. NLAA\, 2018.\n\n[3] K. Cherifi\, H. Gernandt\, and D. Hinsen. The difference between port-Hamiltonian\, passive and\npositiv e real descriptor systems. MCSS\, 2024.\n\n[4] H. Blazhko\, M. Wojtylak\, Detection of the higher order Kronecker blocks by perturbation\, 2026 \, preprint.\n LOCATION:https://stable.researchseminars.org/talk/PHSeminar/38/ END:VEVENT END:VCALENDAR