Cherifi, KarimKarimCherifiGernandt, HannesHannesGernandtHinsen, DorotheaDorotheaHinsenMehrmann, VolkerVolkerMehrmannMorandin, RiccardoRiccardoMorandin2025-07-292025-07-292025https://publica.fraunhofer.de/handle/publica/49004610.1007/s00498-025-00421-zThe relationship between different dissipativity concepts for linear time-varying systems is studied, in particular between port-Hamiltonian systems, passive systems, and systems with nonnegative supply. It is shown that linear time-varying port-Hamiltonian systems are passive, have nonnegative supply rates, and solve (under different smoothness assumptions) Kalman–Yakubovich–Popov differential and integral inequalities. The converse relations are also studied in detail. In particular, sufficient conditions are presented to obtain a port-Hamiltonian representation starting from any of the other dissipativity concepts. Two applications are presented.enPort-Hamiltonian systemPassivityNonnegativityKalman–Yakubovich–Popov inequalitySystem transformationjournal article