| Citation: | DU Chenhong, WANG Yanrong, LI Di, et al. Experimental investigation on vibration suppression of a model blade by triangular prism underplatform damper[J]. Journal of Aerospace Power, 2025, 40（8）：20230739 doi: 10.13224/j.cnki.jasp.20230739
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An experimental system was developed to evaluate the dynamic response of the blade. This system modulated the standard pressure between the triangular prism damper and the platform by regulating the quantity of weights, so as to validate the variation in damping ratios produced by dry friction dampers under structural vibration stress. By sweeping frequencies around the resonant frequency of the simulated blade test specimen, the amplitude-frequency response curve was obtained, from which the critical damping ratio was computed using the half-power bandwidth method. By measuring the vibration stress, the damping ratio characteristic curve was also acquired. The experimental results demonstrated that the two contact surfaces of the triangular prism damper had different damping effects. Moreover, the computed damping ratio characteristic curve agreed well with the experimental data. It was found that: the inertial load of the damper had negligible influence on the maximum damping ratio; when the actual contact area was small, the damping performance of the damper was unstable; and the length of the shank of the blade was positively correlated with the damping effect of the damper.
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