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By making use of the pulse-force, the point on the rotor's plane of the system is beaten. And at the same time, the responses on different points are gathered. 用脈沖力激振轉子系統的同時採集系統的多點響應，相關分析法提取測點的自由振動響應，用對數衰減率判據評定該系統的穩定性。