This thesis presents frequency analysis of given dynamic system with two degrees of freedom. In the first part we present the theory for dynamic of systems with multi degrees of freedom, which enables us to identify natural frequency of the system and its response amplitude. The second part presents analytical models for determination of system response with and without excitation force. The calculations were preformed in Wolfram Mathematica. We calculated values of natural frequency and and response amplitudes in corelation with excitation frequency. We demonstrated good agreement of natural frequencies between models.
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