| Summary: | 碩士 === 國立中正大學 === 機械工程學系 === 85 === The dynamic behavior and optimum design of rotor-bearing system
of high speed spindle are studied in this thesis. It consists of
the outer shaft and the inner shaft. The outer shaft is composed
of the center shaft and the rotor of AC motor. And the inner
shaft is the tool holder. The outer shaft is joined together
with the inner shaft via two join points. The dynamic
behavior of the rotor-bearing system is modeled by the finite
element method. Then the system natural frequencies are
determined by the numerical analysis. Because the mass of the
outer shaft may be much greater than that of the inner shaft,
the single rotor-bearing system is also used to compare the
behavior of the dual rotor-bearing system. The system natural
frequencies are measured to compare the numerical results.
Furthermore, the system steady-state response is also studied.
In optimization, the Augmented Lagrange Multiplier Method (ALMM)
and Modified Method of Feasible Direction (MMFD) of mathematical
programming method are applied in this study. Also, both the
single objective optimization and the multiobjective
optimization are performed and the optimum results are compared.
The optimum results indicate that the steady-state response at
the front bearing and/or the transmitted forces through the
bearings can be significantly reduced by single objective
optimization or multiobjective optimization.
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