This thesis contributes to system identification with experimental modal analysis. The assumption of laminar flow provides the possibility of forming transcendental transfer functions of a hydraulic pipeline. The dynamic excitation of the current valve position of a fast-reacting servo valve and the resulting dynamic pulsation of the injected oil flow rate respectively form the inputs of the system. The resulting pipeline pressure at a specific position of the pipeline is the output behavior of the system. For the procession of the measurements piezo resistive pressure sensors were used. Experimental modal analysis deals with analyzing specific modes. In stationary hydraulic systems, branching, corners as well as diameter transients occur quite often. The stationary behavior has been profoundly analyzed. A dynamical behavior has been assumed, but never investigated in detail (Miller, 1984). Different approaches of evaluations can be chosen. The focus of this thesis was set on the application of dissipative pipeline models. Under assistance of a linear resistance several damping effects were recorded by analysing the frequency behavior and analysed. Hence the results of this diploma thesis can be used within a wide usage spectrum in oil hydraulics, especially in the domain of leakage-and plugging detection. Therefore the aim of this thesis is set to approach the modelling of a 90 cornered flow with small error bandwidth.