A novel test rig for friction parameters measurement on underplatform dampers
| Autor: | Muzio Gola, Chiara Gastaldi, Teresa Maria Berruti |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Frequency response
Friction Computer science Interface (computing) 02 engineering and technology Turbine Damping Damper 0203 mechanical engineering Contact stiffness Friction coefficient General Materials Science Sensitivity (control systems) business.industry Applied Mathematics Mechanical Engineering Structural engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Vibration Nonlinear system 020303 mechanical engineering & transports Mechanics of Materials Modeling and Simulation Line (geometry) 0210 nano-technology business |
| Popis: | The focus of this paper is on the direct experimental investigation of underplatform dampers, friction damping devices used on turbine bladed disks to limit resonant vibrations. Given the nonlinear and highly complex nature of dry friction, model validation of bladed disks with underplatform dampers still relies heavily on experimental verification, which is typically performed using the Frequency Response Function. This paper is the authors’ most recent effort to increase the understanding of friction and damper mechanics by gathering experimental evidence directly at the blade platform/damper interface. A new test rig for frequencies and contact pressures in line with real working conditions has been developed. The geometry of the test rig and its technical features are described in detail in the paper. The dedicated experimental evidence thus obtained is used to estimate (not tune) contact parameters. The influence of frequency, centrifugal load and of the flat-on-flat contact interface morphology is highlighted. Results are compared with those gathered using similar dampers on a different test rig. Contact parameters are then be fed to a state-of-the-art numerical code for the prediction of the dynamic response of friction damped systems. The experimental-numerical comparison is used as validation and as a basis to investigate the simulation sensitivity to contact parameters variability. |
| Databáze: | OpenAIRE |
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