Abstract
Abstract The focus of this paper is on underplatform dampers (UDPs), friction damping devices commonly used in turbines for power generation. Given the nonlinear and highly complex nature of dry friction, model validation of bladed disks with UPDs still relies heavily on experimental verification, which is typically performed using the Frequency Response Function. The AERMEC research group has, in the last ten years, promoted an additional experimental/numerical comparison, based on evidence gathered directly at the blade platform/UPD interface to increase the understanding of friction and damper mechanics. A new test rig for the direct experimental investigation of UPDs at frequencies and contact pressures in line with real working condition has been developed. The geometry of the test rig and its technical features are described in detail in the paper. Different real dampers (real shape and material) are tested. The results analysis includes a complete understanding of the contact states undergone by each damper during a period of vibration and an estimation of its contact parameters. The influence of the damper shape together with the precision of the surface manufacturing and finishing on the damper effectiveness is addressed.
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