spanning rail 中文意思是什麼
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2 low frequency resonance, spanning 40 - 100hz, occurs beside the track. the wheel rail interaction creep force and the sleepers natural frequency cause this
( 2 )列車行進之輪軌激振力頻率與基鈑自然頻率發生共振產生40 - 100hz之低頻噪音。
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