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Particularly, Quad Cities Unit 2 steam dryer experiences hig h cycle fatigue due to an acoustic-induced vibration in case of the power uprate. It is conceivable that the increased steam flow passing, resonantes among a structure, a flow and a pressure fluctuation, resulting in the breakages. To understand the basic mechanism of the resonance, previous research es were done by FEM or point measurement, while it was difficult to understand acoustic resonance in details. 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