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BEGIN:VEVENT
SUMMARY:Volker Mehrmann (TU Berlin)
DTSTART:20240131T150000Z
DTEND:20240131T160000Z
DTSTAMP:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nDifferent representations
of dissipative Hamiltonian and port-Hamiltonian differential-algebraic equ
ations (DAE) systems are presented and compared. Using global geometric an
d algebraic points of view\, translations between the different representa
tions are presented. The results also apply in the Hilbert space setting o
f linear operator equations. Characterizations are also derived when a gen
eral DAE system can be transformed into one of these structured representa
tions. Approaches for computing the structural information and the describ
ed transformations are derived that can be directly implemented as numeric
al methods. The 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nBoundary controlled and o
bserved 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 b
alance 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
element method (FEM)\; then\, some optimal convergence results will be pr
ovided and illustrated on the 2D inhomogeneous and anisotropic wave equati
on.\n\nFinally\, the effectiveness of PFEM will finally be illustrated whe
n capturing refined asymptotic behaviours of the coupled heat-wave PDE sys
tem in different geometric configurations.\n\nJoint work partly with Ghisl
ain 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:20260515T120005Z
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 (pH
Seminar)\n\n\nAbstract\nIn the first part\, we recall the geometric struc
ture of the state space of physical systems. Indeed\, for Thermodynamical
systems\, it is well accepted that the system is first defined by its so-c
alled equilibrium properties. These properties are defined by a set of rel
ations among the extensive and intensive variables\, the Thermodynamic Pha
se variables\, which should satisfy the Gibbs' equations. Actually Gibbs'
equations define a Legendre submanifold of the Thermodynamic Phase Space w
hich is generated by a family of functions\, called thermodynamic function
s. This Legendre submanifolds actually defines the state space of the syst
em.\n\nA similar construction holds for Hamiltonian systems arising for me
chanical systems or electro-mechanical systems' models\, when instead of d
efining a Hamiltonian function\, one considers the reciprocal constitutive
relations relating the energy and the co-energy variables. These reciproc
al relations define a Lagrangian submanifold of the cotangent space of the
energy variables (the space of energy and the co-energy variables).\n\nIn
the second part of the talk\, we shall draw the consequence of the defini
tion of the state space Lagrange or Legendre submanifolds for Hamiltonian
and port Hamiltonian systems. Indeed\, defining the state space as a subma
nifold of some phase space\, corresponds to an implicit definition of the
Hamiltonian dynamics. For irreversible Thermodynamic systems\, one defines
a contact Hamiltonian system on the Thermodynamic Phase Space\, leaving i
nvariant some Legendre submanifold. For Hamiltonian systems defined on Lag
range submanifolds\, one defines a implicit Hamiltonian system restricted
to some Lagrange submanifold.\n\nWe shall finally present some ongoing wor
k\, 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 type of port variables\, derived from the definition of Lagrange or
Legendre submanifolds. We shall illustrate the work with various simple ex
amples 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:20260515T120005Z
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 (pH
Seminar)\n\n\nAbstract\nThe interest of this talk is to show possibilities
to preserve “structure” when continuous-time port-Hamiltonian (PH) mo
dels are translated via numerical integration to the discrete-time domain.
On the example of a simple\n(mechanical) Hamiltonian system with one degr
ee of freedom\, we first illustrate symplecticity\, i.e.\, area preservati
on in the phase plane\, of the flow as an underlying structural property\,
from which energy conservation is derived. Consequently\, we give example
s for numerical integration schemes that are symplectic or energy-conservi
ng.\n\nBoth families of integrators can be used for the definition of disc
rete-time PH systems\, where the definitions of discrete-time port variabl
es play a fundamental role to describe energy transfer over the system bou
ndary. We highlight similarities and differences using the two paths\, in
particular based on the discrete-time energy balance equations.\n\nFinally
\, we give two examples from our recent research\, where discrete-time mod
els of geometrically 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\
nThis talk investigates the regulation and trajectory tracking problems fo
r classes of mechanical and Electromechanical (EM) systems. To this end\,
we formulate energy-based models within the port-Hamiltonian (pH) framewor
k. Using the pH framework\, we employ standard Lyapunov theory and contrac
tion theory to develop control approaches with physical interpretation. Th
ese methods are related to the well-known Interconnection and Damping Assi
gnment Passivity-Based Control approach. However\, the proposed control me
thods remove the need for solving partial differential equations or implem
enting any change of coordinates. In detail\, in the case of mechanical s
ystems\, we propose control design methods using dynamic extensions to rem
ove velocity measurements from the controllers while rejecting matched and
unmatched disturbances. In addition\, we suggest control approaches spe
cifically using the notion of coupled damping to enhance the performance
of transient response and the convergence rate in the EM systems. The app
licability of these methods is illustrated via different mechanical and el
ectromechanical applications.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Silke Glas (U Twente)
DTSTART:20240703T140000Z
DTEND:20240703T150000Z
DTSTAMP:20260515T120005Z
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 (pH 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://stable.researchseminars.org/talk/PHSeminar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yann Le Gorrec (FEMTO-ST\, Besançon)
DTSTART:20240911T140000Z
DTEND:20240911T150000Z
DTSTAMP:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nOriginating in macrosc
opic mechanics\, port Hamiltonian formulations were proposed and intensive
ly used for the modular modelling and control of conservative and dissipat
ive multiphysics systems for which the thermal domain does not need to be
explicitly represented. Yet in many cutting-edge engineering applications\
, for example within the field of soft or micro-nano robotics\, process co
ntrol\, 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 atte
mpts have been made to extend port Hamiltonian and Lagrangian formulations
to Irreversible Thermodynamic systems. Among them\, the Irreversible port
Hamiltonian formulations\, which consider the entropy as additional state
variable\, are particularly promising for their simplicity\, their constr
uctiveness and the amount of information they can encode.\n\nIn the first
part of this talk we recall some definitions and properties of finite dime
nsional 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 interconnection of two controlled lrreversible port Ham
iltonian Systems via thermal ports has to be state and co-state modulated
in order to ensure the closed-loop lrreversible port Hamiltonian structure
\, satisfying the first and second laws of Thermodynamics. This modulation
and closed loop invariants are then used to derive efficient controllers
via energy shaping and entropy assignment. In the second part of this talk
we present some recent extensions to boundary controlled distributed para
meter systems defined on a 1D spatial domain and show\, on the heat equati
on example\, 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://stable.researchseminars.org/talk/PHSeminar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Philipp Schulze (TU Berlin)
DTSTART:20241002T140000Z
DTEND:20241002T150000Z
DTSTAMP:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nModel order reduction (MOR) is
a powerful tool for reducing the computational effort in applications wher
e a computational model needs to be evaluated multiple times\, e.g.\, in c
ontrol and optimization. MOR aims to replace the full-order model (FOM) by
a reduced-order model (ROM) which should be cheap to evaluate and suffici
ently accurate. In many applications it is also desirable to preserve impo
rtant properties of the FOM such as stability or passivity. One possibilit
y to guarantee this preservation is to use MOR schemes which preserve a di
ssipative or port-Hamiltonian structure. While there are structure-preserv
ing variants of the most common MOR techniques available\, these methods t
ypically lack computable a priori error bounds and suffer from a loss of a
ccuracy in comparison to their non-structure-preserving counterparts. More
over\, these techniques 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 struc
ture-preserving balancing-based MOR approach which allows to provide compu
table a priori error bounds. Furthermore\, we demonstrate that the accurac
y of the ROM may be significantly improved by replacing the FOM Hamiltonia
n by another one which is based on an extremal solution of the correspondi
ng Kalman-Yakubovich-Popov inequality. In the second part of this talk\, w
e address the question of how to construct structure-preserving MOR scheme
s when using a nonlinear approximation ansatz\, which is especially releva
nt in the context of transport-dominated systems. For a special class of n
onlinear ansatzes\, we demonstrate that structure-preserving ROMs may be o
btained based on a weighted residual minimization scheme. The effectivenes
s of the presented approaches is demonstrated by means of numerical exampl
es.\n\nThe first part of this talk is based on joint work with Tobias Brei
ten and Riccardo 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\
nPort-Hamiltonian structures have a pervasive impact in numerous applied d
omains enlarging the more traditional mechanical one. While these structur
es are unequivocally characterized in the continuous-time domain\, several
descriptions are proposed in the literature when referring to discrete-ti
me or sampled dynamics. In this talk we discuss a description of port-Hami
ltonian structures in discrete time that makes reference to the notion of
average passivity\, introduced to deal with systems without throughput. Ex
ploiting the average passivity property of these forms\, we show how dampi
ng feedback and energy-based control strategies can be designed. Then\, we
investigate the sampled-data case and show how these forms set in discret
e-time can be recovered under time-integration through modification of the
interconnection and dissipation matrices characterizing the continuous-ti
me dynamics. Some simulations are presented to illustrate analysis and con
trol performances\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Timo Reis (TU Ilmenau)
DTSTART:20241204T150000Z
DTEND:20241204T160000Z
DTSTAMP:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nWe first present a theory for the optimal co
ntrol of infinite-dimensional systems described by system nodes. In this c
ontext\, we focus on minimizing the L^2-norm of the output\, combined with
an additional weighting of the final state. The input is assumed to lie w
ithin a closed and convex set.\nNext\, we address energy-optimal control f
or infinite-dimensional port-Hamiltonian systems. We show that minimizing
the supplied energy can be reformulated as an equivalent output minimizati
on problem. The theory will be illustrated using a boundary control wave e
quation 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nWe discuss novel applications of interactin
g particle systems in the context of socio-economic applications and revea
l their port-Hamiltonian structure\, which can be used to study their long
-time behaviour. Moreover\, we discuss some results of optimal control of
interacting particle systems. The theory will be underpinned by numerical
simulation results.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Beckers (Vanderbilt University)
DTSTART:20240814T140000Z
DTEND:20240814T150000Z
DTSTAMP:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract
\nData-driven approaches achieve remarkable results for modeling nonlinear
systems based on collected data. However\, these models often neglect bas
ic physical principles which determine the behavior of any real-world syst
em. This omission is unfavorable in two ways: The models are not as data-e
fficient as they could be by incorporating physical prior knowledge\, and
the model itself might not be physically consistent. \nIn this talk\, I wi
ll present our results on physics-constrained Gaussian processes for learn
ing of dynamical system with a focus on the class of electromechanical sys
tems. I will propose Gaussian Process Port-Hamiltonian systems (GP-PHS) as
a physics-constrained\, nonparametric Bayesian learning approach with unc
ertainty quantification for ODE and PDE systems with unknown dynamics. \nI
n contrast to many physics-informed techniques that impose physics by pena
lty\, the proposed data-driven model is physically correct by design. The
framework is in particular suitable for composable learning as its structu
re can be preserved under interconnection. Finally\, I demonstrate the app
lication of the model within a robust control framework to enable safe lea
rning-based control.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefano Stramigioli (U Twente)
DTSTART:20250205T150000Z
DTEND:20250205T160000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/13
DESCRIPTION:Title: The geometry and topology of Ports\nby Stefano Stramigioli (
U Twente) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\n
In this lecture the importance of a coordinate invariant description of po
rts will be given introducing the mathematical structure of the most gener
al 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://stable.researchseminars.org/talk/PHSeminar/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Arjan van der Schaft (U Groningen)
DTSTART:20250402T140000Z
DTEND:20250402T150000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/14
DESCRIPTION:Title: Symmetry in linear physical systems\nby Arjan van der Schaft
(U Groningen) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstr
act\nPhysical systems with symmetry arise abundantly in applications\, and
are endowed with interesting mathematical structures. In this talk we wil
l focus on reciprocal and input-output Hamiltonian systems. Their characte
rization 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 sy
mmetric kernel of their Hankel operator\, while input-output Hamiltonian s
ystems are more naturally approached from a Volterra operator point of vie
w. Geometrically\, it turns out that both define Lagrangian subspaces with
corresponding generating functionals. Next\, the close relations with por
t-Hamiltonian systems and time reversibility will be considered. The syste
m classes under consideration are expected to admit scalable control laws\
, and to be important 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:20260515T120005Z
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 (p
H Seminar)\n\n\nAbstract\nEquations describing Port-Hamiltonian systems co
me in many forms\, they can be ordinary linear or non-linear differential
equations\, and even discrete time difference equations. In this presentat
ion 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\, and this choice leads to easy checkable conditions for
e.g. existence of solutions. By combining mathematical techniques with the
power balance\, 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nIn this talk\, we pres
ent a reduced-order energy shaping control approach tailored for large-sca
le linear port-Hamiltonian systems\, such as those arising from distribute
d parameter models and networked structures. We introduce dynamic controll
ers designed using both low-dimensional models and reduced-order models ob
tained through modal truncation\, ensuring asymptotic stability by leverag
ing structural invariants. Special attention is given to shape control app
lications\, where equilibrium points are parametrized through controller p
arameters\, allowing optimization of the closed-loop configuration accurac
y. Additionally\, we discuss stability margins that link reduced-order mod
el properties to transient performance. Practical implementation is illust
rated through dynamic shape control of a Mindlin plate\, demonstrating the
effectiveness of the proposed methodology. The talk is based on a joint w
ork with Cristobal Ponce (AC3E\, Chile) and Yann Le Gorrec (FEMTO-ST\, Fra
nce).\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alessandro Macchelli (U Bologna)
DTSTART:20250604T140000Z
DTEND:20250604T150000Z
DTSTAMP:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nIn this talk\, we present a
general approach to derive discrete-time approximations of lumped and dis
tributed-parameter port-Hamiltonian systems. Since the goal is to preserve
passivity\, the key ingredient has been to replace the gradient of the Ha
miltonian function that appears in the continuous-time dynamics with a dis
crete gradient. In this way\, the discrete-time approximation inherits the
passivity of the initial continuous-time dynamics. In finite dimensions\,
the result is a state equation in implicit form\, while for linear bounda
ry control systems\, we obtain a boundary-value problem to be solved at ea
ch step. In both cases\, the well-posedness of the resulting discrete-time
dynamics is discussed. Regarding control design\, the continuous-time ene
rgy-shaping plus damping injection technique is extended to the discrete-t
ime scenario. In the final part of the talk\, we briefly discuss the probl
em of coupling the digital controller with the continuous-time plant and t
he use of such 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:20260515T120005Z
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 (p
H Seminar)\n\n\nAbstract\nThis talk illustrates the motivations for using
port-Hamiltonian systems (PHS) in musical acoustics through two complement
ary case 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 simplest passive prototype of self-oscillating instrument\, with the a
im of making explicit the fundamental mechanisms of energy exchange and au
to-oscillation. \nThe second part addresses a more advanced scenario\, whe
re homogenisation methods are combined with port-Hamiltonian formulations
to describe infinite-dimensional dynamics\, exemplified by acoustic propag
ation in a pipe with a porous wall. Together\, these two perspectives illu
strate the range of modelling possibilities offered by the port-Hamiltonia
n framework\, from elementary prototypes to sophisticated multiscale descr
iptions.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pablo Borja (U Plymouth)
DTSTART:20250702T140000Z
DTEND:20250702T150000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/19
DESCRIPTION:Title: Passivity-based control of mechanical systems\nby Pablo Borj
a (U Plymouth) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstr
act\nMechanical systems are crucial in sectors such as construction\, manu
facturing\, and transportation\, where relevant examples of these systems
include cranes\, robots\, and autonomous vehicles. This talk discusses som
e intuitive control design methods for mechanical systems. Such strategies
are based on exploiting the port-Hamiltonian structure of these systems a
nd their passivity 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nIn thi
s talk we address the time discretization of port-Hamiltonian (pH) differe
ntial-algebraic equations (DAE). This combines the challenges of discretiz
ing a DAE consistently\, and preserving the pH properties\, two tasks whic
h are nontrivial to fulfill at the same time. In particular\, we will disc
uss the application of Runge-Kutta methods\, among which collocation metho
ds are treated as a special case\, discrete gradient methods\, and partiti
oned methods\, with a particular focus on semi-explicit pHDAEs. This talk
includes joint work with Philipp Kinon\, Volker Mehrmann\, and Philipp Sch
ulze.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Serkan Gugercin (Virginia Tech)
DTSTART:20251203T150000Z
DTEND:20251203T160000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/21
DESCRIPTION:Title: Model Reduction for port-Hamiltonian System\nby Serkan Guger
cin (Virginia Tech) as part of Port-Hamiltonian Seminar (pH Seminar)\n\n\n
Abstract\nThis talk provides a brief introduction to the fundamentals of m
odel reduction\, highlighting why reduced models are essential for large-s
cale dynamical systems. We will focus on interpolatory model reduction met
hods\, outlining their key ideas and their connection to optimal approxima
tion in the H2 norm. We then demonstrate how these techniques can be exten
ded to model reduction of port-Hamiltonian systems\, enabling structure-pr
eserving\, efficient\, 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:20260515T120005Z
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 (pH Seminar)\n\n\nAbstract\nIn this talk\, we
explore several ways to leverage (port-)Hamiltonian structures in the solu
tion of optimal control problems.\n\nWe first present a novel time-domain
decomposition strategy. Therein\, the optimality system is formulated as a
sum of dissipative operators\, which enables a Peaceman–Rachford and Do
ugla-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 for
mulation\, we establish convergence of the method.\n\nIn the second part\,
we focus on tailored iterative solvers for linear systems arising from th
e discretization of port-Hamiltonian optimal control problems. In particul
ar\, we will inspect Krylov subspace methods that utilize the symmetric pa
rt of the operator as a preconditioner to guarantee mesh-independent conve
rgence.\n\nWe illustrate our results by means of various large-scale probl
ems from fluid 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:20260515T120005Z
UID:PHSeminar/33
DESCRIPTION:Title: Discretization of port-Hamiltonian systems\nby Kirsten Morri
s (University of waterloo) as part of Port-Hamiltonian Seminar (pH Seminar
)\n\n\nAbstract\nController design for distributed parameter systems is of
ten accomplished using a lumped approximation. For a system that is expone
ntially stable\, it is reasonable to expect the approximation to preserve
this decay rate. Preservation of the decay rate is important for realistic
simulations and also for reliable controller design. An example illustrat
ing the problems that can occur even in a simple problem will be given. I
t will be shown that a number of standard methods - not all - are structur
e-preserving for a class of port-Hamiltonian systems. Most importantly\, w
hen these systems are exponentially stable\, a uniform decay rate is prese
rved by the approximations. The method is to show that a modification of t
he energy yields a Lyapunov function. The results are illustrated with s
imulations 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:20260515T120005Z
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\nA
bstract\nSystem identification is essential in modeling\, analysis\, and c
ontrol of dynamical systems\, particularly when first-principles models ar
e incomplete or unavailable. In this talk\, we begin with a brief introduc
tion to system identification\, outlining its main objectives\, challenges
. We then focus on structured modeling frameworks\, with particular emphas
is on port-Hamiltonian systems\, which have attracted significant attentio
n due to their strong ties to physics\, energy-based interpretation\, and
interesting properties for control and stability analysis. We study system
identification under explicit structural and physical constraints\, using
the port-Hamiltonian formalism as a unifying framework\, starting with th
e identification of linear port-Hamiltonian systems\, and highlighting how
structure-preserving approaches can be leveraged to recover physically co
nsistent models from data. We then move to nonlinear port-Hamiltonian syst
ems and discuss recent methods that enable their learning from data\, incl
uding generalizations to higher-order and more complex systems through neu
ral scaling laws. The talk concludes with a discussion of current research
directions\, including recently proposed architectures for learning port-
Hamiltonian systems.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carsten Hartmann (BTU Cottbus-Senftenberg)
DTSTART:20260506T140000Z
DTEND:20260506T150000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/35
DESCRIPTION:Title: Stochastic port-Hamiltonian systems of Langevin-type: realisatio
n of constraints\nby Carsten Hartmann (BTU Cottbus-Senftenberg) as par
t of Port-Hamiltonian Seminar (pH Seminar)\n\n\nAbstract\nThe realisation
of constraints by strong confining forces is a classical theme in mechanic
s. Recently\, there has been a growing interest in studying constrained st
ochastic differential equations\, due to their relevance in molecular dyna
mics\, power network modelling\, or machine learning. \n\nIn this talk\, w
e will discuss the realisation of algebraic constraints on so-called under
damped Langevin systems that are a special kind of stochastic port-Hamilto
nian systems\, the key property being that the noise coefficient is degene
rate and acts only on those states that are subject to friction. Physicall
y\, constraints can be realised by different mechanisms\, such as strong f
orces or large friction\, but also small or large masses. We will discuss
limit theorems for several of these confinement mechanisms from both physi
cal and mathematical perspective\, including quantitative convergence resu
lts. It turns out that some of the confinement mechanisms provide uniform-
in-time approximations of the limiting differential-algebraic (i.e. constr
ained) system\, but others do not\, and we will explain why this observati
on is relevant for Monte-Carlo sampling of high-dimensional probability di
stributions. \n\nThis is joint work with Lara Neureither (Cottbus) and Upa
nshu Sharma (Sydney).\n\nReferences: \n\n[1] Hartmann\, C.\, Neureither\,
L.\, & Sharma\, U. (2025). Affine constraints in non-reversible diffusions
with degenerate noise. arXiv preprint arXiv:2505.00243 (to appear in SIAD
S).\n\n[2] Hartmann\, C.\, Neureither\, L.\, & Sharma\, U. (2026). Realisa
tion of constraints in underdamped Langevin dynamics. arXiv preprint arXiv
:2604.02129.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Federico Califano (University of Twente)
DTSTART:20260304T150000Z
DTEND:20260304T160000Z
DTSTAMP:20260515T120005Z
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 (
pH Seminar)\n\n\nAbstract\nPort-Hamiltonian (pH) systems have gained extre
me popularity in the last 3 decades in different fields. As examples\, mat
hematicians use pH formulations to assess well-posedeness of partial diffe
rential equations\, data-scientists and numerical engineers exploit pH for
mulations to develop structure-preserving integrators\, physicist acknowle
dge pH theory as an insightful extension of Hamiltonian dynamics\, and sys
tem theorists use pH formulations for modelling and control purposes.\n\nP
H theory is being studied by different communities from different angles a
nd at different levels of abstraction. As examples\, some see pH systems a
s particular cases of differential equations with inputs\, and some identi
fy pH systems with abstract underlying geometric structures which are hard
to grasp without a formal mathematical training. \n\nOften this plurality
of vision in understanding pH systems\, as well as the relatively young a
ge of the topic\, can cause confusion in scientists and engineers approach
ing the topic.\n\nThis seminar wants to provide a synthesis of the deep me
aning of pH systems\, 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:20260515T120005Z
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://stable.researchseminars.org/talk/PHSeminar/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michal Wojtylak (agiellonian University)
DTSTART:20260401T140000Z
DTEND:20260401T150000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/38
DESCRIPTION:Title: Linear algebra of dissipative Hamiltonian systems.\nby Micha
l Wojtylak (agiellonian University) as part of Port-Hamiltonian Seminar (p
H Seminar)\n\n\nAbstract\nWe will begin with a review of the Kronecker of
pencils appearing in the port Hamiltonian modelling. Although the task s
eems to be completed by [1]\, and [2]\, the transfer function considerati
ons 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 perturba
tion properties of the eigenvalue infinity\, presenting non-asymptotic res
ults based on the Bauer-Fike theorem\, see [4]. Several numerical exampl
es will be considered.\n\n[1] C. Mehl\, V. Mehrmann\, and M. Wojtylak. Mat
rix pencils with coefficients that have positive\nsemidefinite Hermitian p
arts. SIMAX 2022. \n\n[2] N. Gillis\, V. Mehrmann\, and P. Sharma. Comput
ing the nearest stable matrix pairs. NLAA\, 2018.\n\n[3] K. Cherifi\, H. G
ernandt\, and D. Hinsen. The difference between port-Hamiltonian\, passive
and\npositive real descriptor systems. MCSS\, 2024.\n\n[4] H. Blazhko\,
M. Wojtylak\, Detection of the higher order Kronecker blocks by perturbati
on\, 2026 \, preprint.\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Antoine Tordeux (University of Wuppertal)
DTSTART:20260701T140000Z
DTEND:20260701T150000Z
DTSTAMP:20260515T120005Z
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://stable.researchseminars.org/talk/PHSeminar/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Schöps (TU Darmstadt)
DTSTART:20260902T140000Z
DTEND:20260902T150000Z
DTSTAMP:20260515T120005Z
UID:PHSeminar/40
DESCRIPTION:by Sebastian Schöps (TU Darmstadt) as part of Port-Hamiltonia
n Seminar (pH Seminar)\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/PHSeminar/40/
END:VEVENT
END:VCALENDAR