Mass-Spring Systems forTrams

1 Urban Transport as a
Source of Noise Pollution

The noise and vibration insulation offered by full-surface mass-spring systems
manufactured by Getzner enhances the attractiveness of trams as a comfortable and environmentally-sound form of urban transportation.

Our services— Solution development— Alternative solutions— Detailed solutions— Calculations— Modelling— Efficiency forecasting— Material testing— Material development— Project consulting— Installation work
— Technical acceptance ofinstallation work
— Training— Documentation— Proof of efficiency

Impact of structureborne noisehe increasing mobility of modern
society results in an ever higher
level of noise and vibrations. This
problem is particularly acute in
inner-city areas and in heavily urbanized metropolitan areas, where traffic
infrastructure and residential property
are often immediately adjacent.
Traffic-generated noise and vibration isa detrimental aspect for the quality oflife of the residents in the vicinity andconfronts traffic planners and public
transport companies with new challenges.

T

With its mass-spring systems, Getznerhas developed a solution for trams
which provides efficient vibrationreduction via isolation of the tracks.
Transmission of structure-borne noise
to the surroundings is reduced at thesource, thus enabling emissions to bekept to a minimum. This approach has
the additional advantage of effectively
hindering the development of audible
secondary airborne noise, which iscaused by the vibration of buildings
and other infrastructure components.

Providing solutions
Getzner is much more than just a
specialist for top-notch products forvibration isolation: we are a provider ofcomprehensive, all-around solutions.
Our scope of services ranges fromplanning, development of optimized,
customer-specific solutions, participation in installation, specification of all
aspects of the solution and comprehensive after-sales service.
Above and beyond these aspects,
Getzner has very well equippedlaboratory and testing facilities. Our
specialists work together closely withcustomers, placing their wealth ofknow-how and expertise at theirdisposal. Modelling, material testing,efficiency measurements and ongoing
consulting are key points in thedevelopment of effective solutions, andthese strong points have made Getznera leading provider of specialized
solutions for these types of applications.

Welcome to Getzner,
the good vibrations company.

32 Mass-Spring Systems
for Trams

Three base systems for
tramway applications

Advantages— Simple and quick
construction

Backed by over 30 years of experiencein the realization of mass-spring
systems, Getzner offers three standard packages for the isolation of
track superstructures with various
degrees of efficiency. In terms of thedesired natural frequencies f0, thesesystems cover most requirements andare thus promising solutions with abright future ahead of them.

— Low possibility ofconstruction errors— Wide distribution of loads
on the subgrade— Mitigation of structural
vibrations in the track
superstructure— Easy maintenance— Durable, cost-effective
overall system12

f0: 22 Hz

2600

43

f0: 18 Hz

f0: 15 Hz

210

210

210

250

250

250

2600

2600

Specialized solutions also available

Thanks to a flexible modular construction approach, all of the systems
offered by Getzner can be adjusted to
the necessary overall conditions. Thiscan be particularly advantageous for
retrofitting of existing infrastructure,and Getzner can develop optimized
solutions for these types of projects.

f the requirements for the efficiencyof the system to be installed are evenmore stringent or other project-specific details must be resolved, Getzner
is also a competent partner for theformulation of specialized solutions tailored to the particular needs at hand.

Based on its broad range of highly elastic polyurethane elastomers marketed
under the brand names Sylomer® andSylodyn®, Getzner can also meet themost stringent requirements in termsof construction design and the amountof structure-borne noise mitigation.

With these three standardized solutions, natural frequencies from 15 Hz
to 22 Hz can be covered, allowing forstructure-borne noise isolation of up
to 20 dB in the critical frequency
range.

I

NOTTINGHAMBERLINDRESDEN
CRACOW

NANTESBORDEAUX

Getzner has completed over 300
projects using full-surface
bearing systems with Sylomer®
and Sylodyn® and enjoys a solid
reputation around the world as
an experienced specialist for thereduction of structure-borne
noise and vibrations.

Some of our references:+ Alicante+ Barcelona+ Berlin+ Bern+ Bordeaux+ Dresden+ Geneva+ Graz+ Grenoble+ Cracow+ Le Mans+ Linz+ Madrid+ Milan+ Marseille+ Munich+ Nantes+ Nice+ Nottingham+ Paris – St. Denis+ Prague+ Rome+ Rouen+ Seville+ Strasbourg+ Valencia+ Vienna+ and many more...

PRAGUEROUENLE MANS

References

STRASBOURG
MUNICHPARIS –
VIENNA
LINZ
ST.DENIS
BERN
GRAZ
GENEVAMILAN

GRENOBLE

NICEMARSEILLE
ROME
BARCELONAMADRIDVALENCIA
ALICANTE
SEVILLE5

3 Wide-Ranging Competence
and Know-How

Mass-spring systems play
an active role
Vibration isolation in rail applications
for local transportation systems
involves isolating the track superstructure from the surroundings,
which helps to prevent the transmission of vibrations and structure-borne
noise. Mitigation of vibration emissions occurs at the track itself, where
it is most effective.

calculation model using a onedimensional single mass oscillator
can be used for the determination of
the natural frequencies. An oscillatorof this type is often described as asingle degree of freedom (SDOF)
system. Additionally, it is possible todetermine oscillation patterns of trackslabs using computerized simulations.

AOscillation forms,
calculated using thefinite element method(FEM)

6

Determining the limits

Real-life modelling in the laboratory

he finite element method (FEM) isused for the theoretical investigation of an oscillating system. In thistype of calculation model other degrees of freedom which are relevant
for the real system are permitted,
compared to the single mass oscillator
approach. Modal analysis can also beperformed. This form of analysis isused for the determination of the natural frequencies and natural oscillation
forms. It can provide important parameters for understanding the system andfor the design of a structure fordynamic loads.

etzner is able to model operationalloads both in numerical terms andin our real-life testing facilities, whichfeature a wide range of equipment thatis available for the physical testing ofmaterials. In addition to severalhydro-pulse units for product testing,Getzner has developed its own largescale testing stand which can investigate the function of complex systems
composed of individual components.
This competence paves the way for aholistic approach, taking into accountvarious influencing factors and helping
to guarantee the development of areliable and durable solution.

TG

1 Large-scale testing stand2 Hydro-pulse unit
3 Thermal analysis
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MFS en © Copyright by Getzner Werkstoffe GmbH | 07-2023

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Austria
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