Effect of under-platform dampers on the forced vibration of high-speed rotating blades

다국어 초록 (Multilingual Abstract)

Under-platform dampers (UPDs) are commonly used to adapt turbine blade vibration characteristics by friction. However, acquiring their effect on the forced vibration of high-speed rotating blades is difficult. In this paper, the blade vibration experiments with atomised liquid-jet excitation in high-speed rotation were designed to compare the effects of different UPDs on blade vibration. Also, the damping ratios of different UPDS were obtained by numerical calculation methods. The experimental and computational results showed that when the mass of the dampers was within the appropriate range, the maximum vibration responses decreased significantly, and optimum mass of UPDs reduced the vibration by 28 % compared with the vibration responses without dampers. Moreover, the frequencies of the maximum blade response increased with the mass of the UPDs by up to 4.3 %. Meanwhile, the blade vibration response had multiple amplitude peaks due to the dry friction damping with installed UPDs.

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