mass damper - vibration absorber

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.

0 300 600 900 1200 1500 18000.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9Mass damper action

Rotor speed [rpm]

Dis

plac

emen

t [m

m]

without mass damperwith mass damper

Frequency response measured on a vibrating machine

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 tool machine

Mass damper for a wind turbine Mass damper for a stack

A wide range of sizes is possible, starting

from few grams for electronic devices, up to

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

Natural frequency of stack at 2.8Hz

Mass damper for a stack

Without mass damper

With mass damper

Without mass damper

With mass damper

Assembling and testing

Wire rope spring assembly

Mass damper during testing on bench test

Mass damper for structures

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. Friuli 1976 – Buja seismic station

Displacement of the structure at top

without tuned mass damper

Time [s]

Dis

plac

emen

t [m

]

with tuned mass damper

Time [s]

Dis

plac

emen

t [m

]

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

Eng. Stefano Galassi, Ph.D. e-mail: stefano.galassi@eidosengine.com

mobile: +39 333 6907275

tel.: +39 0434 507547

fax: +39 0434 507546

web: www.eidosengineering.com

headquarters: via Roveredo 20/b 33170 Pordenone, Italy

Main contact