Published on February 8, 2014
Mass damper – vibration absorber Eidos Engineering SRL
Mass damper development A mass damper is a vibration absorber able to attenuate significantly the vibrations of a structure or a machine. In the graph we report the frequency response of a machine with and without mass damper. The application of a mass damper gives an important increment of the global damping. Mass damper action 0.9 without mass damper with mass damper 0.8 Displacement [mm] 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 300 600 900 1200 1500 Rotor speed [rpm] Frequency response measured on a vibrating machine 1800
Fields of application • Tool machines • Machine frames and chassis • Gears and transmissions • Stacks • Bridges and footbridges • Constructions • Energy generation plants • Wind turbines
Mass damper examples Eidos Engineering develops and supply new generation vibration absorbers, designed according to customer’s specifications. Mass damper for a stack Mass damper for a wind turbine A wide range of sizes is possible, starting from few grams for electronic devices, up to Mass damper for a tool machine some tons, for structures such as bridges or buildings.
Mass damper design Mass damper for a wind turbine Natural frequency of turbine at 0.47Hz Without mass damper With mass damper Mass damper for a stack Natural frequency of stack at 2.8Hz Without mass damper With mass damper
Assembling and testing Mass damper during testing on bench test Wire rope spring assembly
Mass damper for structures Displacement [m] without tuned mass damper Time [s] Dynamic analysis of a three stories structure. The graphs show the displacements of the structure under the 1976 Friuli earthquake without the application of a mass damper and with a mass damper placed at top. Displacement [m] with tuned mass damper Time [s] Friuli 1976 – Buja seismic station Displacement of the structure at top
Advantages • Up to 70% vibration reduction • Up to 70% stress reduction • Noise attenuation • Increased security • Opportunity to reduce weight and dimensions of mechanical structures • Simplicity and reliability
Main contact Eng. Stefano Galassi, Ph.D. e-mail: firstname.lastname@example.org mobile: +39 333 6907275 tel.: +39 0434 507547 fax: +39 0434 507546 web: www.eidosengineering.com headquarters: via Roveredo 20/b 33170 Pordenone, Italy
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