# 臺灣博碩士論文加值系統

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 The object of this paper is studying dynamic behavior ofrotor_bearing system.A rotor-bearing system which consists of aflexible shaft, eccentricity disks,and bearings. The shaft ismodeled as finite rotating shaft elements. The disks andbearings are represented as concentrated mass. Particularly, thediscussion of bearins have two way, first, the lubricatedbearings is simulated as springs and damper in two perpendiculardirections, second, the lubricated bearings will be representedusing the impedance theory.The analytical method of the researchadopt energy principle. First, rotor-bearing system divide twosubsystems, flexible rotor shaft-disk subsystem and bearing-support structure subsystem, respectively. Then we calculatedynamic energy, potential energy and dissipation function insubsystem. In order to derive the general equations of motion,the Lagrange principle is applied. The whole system equation isrepresented as the absolute coordinate system or rotatingcoordinate system.When whole rotor-bearing system equation ofmotion is derived, we use Newmark method toderive motion orbitgraph of system. In this paper, we analyze two-bearing one-massand three-bearing two-masses rotor system. For two rotor-bearingsystems with short bearing and finite length bearing analysisare very similar in motion state. However, long bearing analysisresult is not good.
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