<![CDATA[In the shaft-rotor system, vibration problems often occur. Therefore, in order to vibration analysis can be performed as well as operation speed limits can be determined properly, then information about the natural frequency and critical speed of shaft-rotor system must be known well. Natural frequency of the rotor-shaft system depends on it's speed. In this study, analysis of the dynamic behavior of a shaft-rotor system model by using the finite element method (FEM) has been done. Analysis was performed to obtain the critical speeds and to visualize mode shapes of the 3D shaft-rotor system model. Here, shaft-rotor system model consists of a 3D multi-storey shaft which is divided into 48 elements, two rivet shaft bearings, two disks, each of which is divided into 12 elements. Shaft speed in RPM varied from 0 to 24000 RPM with 100 RPM intervals. For each rotation axis arranged mass matrix, damping matrix, and stiffness matrix systems using the finite element method. The price of natural frequency and mode shape vector price is determined by using the direct method. From the analysis that has been done, the natural frequency obtained 96 forward and 96 backward natural frequency. For 2 pieces of personal frequencies forward and 2 backward the first natural frequency obtained 7 pieces of critical shaft rotation rates. From the visualization mode shape for the first 4 rounds of the critical mode shape obtained at the first natural frequency is equal to the forward mode shape at the first natural frequency and the backward mode shape at the second natural frequency is equal to the forward mode shape at the second natural frequency backward. From the visualization mode shape for 3 rounds last critical mode shape obtained in 2 pieces forward of the first natural frequency and mode shape on the same 2 pieces of the first natural frequency equal backward.]]>
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