A mass damper is a vibration absorber able to attenuate the vibrations of a structure or a machinery. By a mass damper it's possible to increase the global damping of the system without the necessity to modify the mechanical structure.

1. Mass damper – vibration absorber
Eidos Engineering SRL

2. 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

3. Fields of application
• Tool machines
• Machine frames and chassis
• Gears and transmissions
• Stacks
• Bridges and footbridges
• Constructions
• Energy generation plants
• Wind turbines

4. 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.

5. 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

6. Assembling and testing
Mass damper during testing on bench test
Wire rope spring assembly

7. 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

8. 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

9. Main contact
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