| Summary: | 碩士 === 國立中正大學 === 機械系 === 88 === This paper focus on the ground vibration due to a high speed rail subjected to a moving load. Simplifying the model as an infinite beam with periodic supports, the ground velocity spectrum density can be found by the displacement of the beam in wavenumber domain and the Green’s function of the ground. When the beam undergoes a force near to stationary, the ground vibration spectrum exists only the force frequency. With the increase of the force moving velocity, supports raise infinite components, and the traditional Doppler effect isn’t adaptive anymore. Both the space of the supports and the force moving velocity decide the vibration amplitude and the locations of peaks and valleys in spectrum. By adjusting the force length, nulls in spectrum can be appointed, and the ground vibration can be reduced in this way.
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