Observer design for a class of nonlinear systems combining dissipativity with interconnection and damping assignment

A nonlinear observer design approach is proposed that exploits and combines port-Hamiltonian systems dissipativity theory. First, a passivity-based using interconnection damping assignment for time variant state affine presented by applying output injection to the system such error dynamics takes structure. The stability of assured exploiting its passivity properties. Second, this setup extended develop an class with varying forward feedback contribution. For systems, theory dissipative observers adapted combined results assignment. convergence compound determined linear matrix inequality. performance both approaches analyzed in simulation examples.