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arXiv · 2608.05143

Port-Hamiltonian modelling of coupled rigid/flexible multibody systems

Thomas Berger·René Hochdahl·Timo Reis·Robert Seifried
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Abstract

We develop a port-Hamiltonian framework for coupled rigid/flexible multibody systems. The rigid dynamics may be nonlinear and subject to configuration and velocity constraints, while the flexible components are described by linear port-Hamiltonian partial differential equations on one-dimensional spatial domains. The subsystems interact through boundary or distributed ports. On the flexible side, the differential operator and its domain remain fixed, whereas state dependence enters only through finite-dimensional coupling components of the Dirac structure. We show that, under a natural surjectivity condition, the port-Hamiltonian interconnection with a modulated Dirac structure of a finite-dimensional rigid subsystem again yields a modulated Dirac structure. The Hamiltonians of the subsystems add, while the internal coupling powers cancel. The framework is illustrated by a planar moving Euler--Bernoulli beam and a slider--crank mechanism with a flexible connecting member.

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Thomas Berger, René Hochdahl, Timo Reis, Robert Seifried. 2026-08-05. Port-Hamiltonian modelling of coupled rigid/flexible multibody systems. https://arxiv.org/abs/2608.05143

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