Analytical analysis for vibration characteristics and damping of a hard-coating blisk

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (20) : 1-7.

GAO Feng1,2, SUN Wei1,2

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Abstract

To solve the difficulty of dry friction damper implementation in vibration reduction of a blisk (integral bladed disk), a novel damping improvement method by depositing hard coating on blades was proposed and then verified in this study.Firstly, a continuous parameter model (CPM) of the composite structure of the hard-coating bladed disk was established.Then, equivalent parameters of the hard-coating blades were derived based on the Oberst beam and the complex modulus theories.Further, natural characteristics of the hard-coating blisk were obtained by using of the Ritz method.Finally, a blisk with depositing NiCoCrAlY+YSZ hard coating on single side of blades was taken to conduct numerical calculation.The results were compared with those obtained by experiment tests.Moreover, the influence of hard coating on natural characteristics of the hard-coating blisk was discussed, respectively.The influence of coating thickness and area on damping capacity were studied emphatically.Results reveal that the NiCoCrAlY+YSZ hard coating has a significant effect on modal loss factors (improve six times approximately), with slightly altering the natural frequencies (around 3%).The resonant response of the blisk can be suppressed remarkably.

Key words

blisk / hard coating / composite structure / vibration characteristics / coating parameters / damping capacity

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GAO Feng1,2, SUN Wei1,2. Analytical analysis for vibration characteristics and damping of a hard-coating blisk[J]. Journal of Vibration and Shock, 2018, 37(20): 1-7

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