Vibration Reductionin Mechanical and Plant Engineering

Elastically mounted devices are
more cost-effective and efficientin the long term

Vibration protection increases thevalue of production processes andadjoining residential buildings andworking spaces

The long-term effectiveness ofthe materials is guaranteed1 Minimizing Vibrations
and NoiseFoundation bedding of a pumpwith Sylomer®

For optimum results: high-tech materials
Sylomer® and Sylodyn®

Machines generate vibrations,causing noise and damage.

Why use elastic mountings formachines?

The advantages of the GetznersolutionV— Elastically mounted devices are morecost-effective and efficient in thelong term.
— Optimum vibration solutions usuallyaccount for less than 1 % of the initialcost. But solutions that are added
later are often expensive and lesseffective.
— Vibration protection increases thevalue of office space, production processes and adjoining residentialbuildings.

Elastic bedding on Sylomer® andSylodyn®, in or under a machine,
effectively reduces vibrations andstructure-borne noise.
— The bearings are easy to install,
maintenance-free and are consistently effective throughout theservice life of the machine.
— As the bedding is individually calculated and adapted, it is possible toachieve a low natural frequency
and greater effectiveness.

ibrations and their consequences
are not only detrimental to theimmediate surrounding area, they also
negatively affect manufacturing andquality processes in the vicinity anddisrupt the neighbourhood and theenvironment.

Measures to protect devices, machines and the surroundings from vibrations

314

2

56

6

1 Server mounting

3 Bearing of air-handling-units*

5 Foundation bedding

2 Machine bearing

4 Floating floor, bearing ofsensitive equipment

6 Machine foundation bearings* Refer to brochure “Vibration Solutions for Technical Facility Equipment”

2 Potential Solutions and Benefits

Challenge

Solution description

When technical equipment is operated,
solid objects and machine components
start vibrating. This produces structure-borne noise and secondary
airborne noise. Vibrations, noise andsometimes even health hazards are
the unwanted result.

Source isolation

Solutions

An elastic intermediate layer candampen the high dynamic forces of amachine. This reduces the passage of
disruptive vibrations and decouples thevibration source from the surroundings, e.g. presses, compressors.

Vibration solution requirements

Point bearing(Machine base)

Strip bearing

Recipient isolation
On the one hand, effective vibration
isolation must be able to absorb existingstatic and dynamic loads. On the otherhand, the dynamic reaction of themounting should be soft and less rigid
than comparable materials (such as rubber or cork). Statically and dynamicallyoccurring forces should be dampened
both vertically and horizontally.

Elastic bedding protects machines andsensitive components against thevibrations of instruments that have notbeen decoupled. The machine isisolated from the surroundings, e.g.
measuring equipment, servers.

Full-surface bearing

Machine components

Foundation bedding

The single mass oscillator principle

Working principle
Fƒ

0

12πcm1T

T = period length in s
ƒ0 = natural frequency in Hzc = spring constant in N/m
m = vibrating mass in kg
C = spring
F = force
D = damper
4Sylomer® and Sylodyn® combine
spring and damper properties inmaterials.

mDCFe

The mode of operation is based on
the principle of a single massoscillator.Various application areas

Point bearings for a air handling unit

The benefits of theGetzner solution— More cost-effective— Properties can be calculated to tailoreffectiveness— The long-term effectiveness of thematerials is guaranteed over theentire service life of the machine— Zero-maintenance— Highly effective at a low construction
height and deflection (protecting
electrical and mechanical connections)— Natural frequencies from 6 Hz areachievable*— Load ranges from 0.5 t/m2 to 600 t/m2

— Tolerance compensation forunevenness— Can be used as springs, dampers oras a spring/damper combination— Individually adaptable geometry(adapted to the local installationsituation)— Elastically decoupled pre-stressedbearings and screw connections canabsorb tensile forces— The bearings absorb high dynamicforces as well as horizontal andvertical forces— The material properties are consistent, as none of the constituents canpermeate* Lower natural frequencies can be achieved
with Isotop® spring elements.

Combined heat and power plant
GE Jenbacher
53 Materials and Services

Sylomer® – high elasticity
and long service life

Sylodyn® – high dynamicdurability

Sylodamp® –high damping

Universally applicable elastic PU
material, spring/damper combination,
proven in the field for more than 45years

Technical spring with pronounced
dynamic and highly elastic properties,
proven in the field for more than 20years

Dampers with special energy-absorbing properties, proven in the field formore than 15 years

Material characteristics:— Mixed cellular— Static range of use from0.011 N/mm2 to 1.2 N/mm2— Load peaks up to 6.0 N/mm2— Very low amplitude dependence— Low creep tendency— Proven long-time behaviour— High fatigue strength— No frequency dependence— Finely graded range (10 standardtypes) for optimum system design

Material characteristics:— Closed cell
— Static range of use from 0.075 N/mm2
to 6.0 N/mm2— Load peaks up to 18.0 N/mm2— Very low amplitude dependence— Low creep tendency— Proven long-time behaviour— High fatigue strength— No frequency dependence— Finely graded range (7 standardtypes) for optimum system design

Material characteristics:— Mixed cellular— Static range of use from0.005 N/mm2 to 0.5 N/mm2— Viscoelastic PU construction— High internal damping— Mechanical loss factor between
0.46 and 0.61
— Graded range (6 standard types)
for optimum system design

Material functions: vibration isolation, vibration damping, shock absorption
1Sylomer®

0Sylodyn®

Sylodamp®
-1

6Elastic decoupling of a production plant for foodServices from Getzner:a one-stop shop
Support in the planning phase— Calculating the bearing— Measuring the excitation spectra— Vibration analysis of buildings— Taking seismic requirements intoaccount— Drawing up installation plans— Advising on connection details
Online calculation tool
— Calculating the optimum mounting

High-tech materials from our in-houseresearch and development team
— Guaranteed long-term effectiveness— Consistently effective over the entire
service life of the machine— Maintenance-free bearings

Cooperation with recognised andindependent experts

Installation and assembly— Installation support provided bytrained specialists— No interruptions to the construction
process

Option of developing special
bearings and material
combinations

Loss factor

Potential areas of application comparedDecades of experience around theworld in providing bearings formachines

The graphic shows the different properties of the productfamilies with regard to suspension and damping.

0,6
0.6

0,5
0.5

0,40.40.3
0,30.20,2Loss factor

Natural frequency f0

Sylomer® andSylodyn®

0.03 to 0.6

6 to 23

Isotop® steel springs

0.01

2 to 8

Steel 10.0004

0.5 to 5

Compact
elastomers 1

0.03 to 0.3

6 to 25

Foamedelastomers 1

0.03 to 0.6

2 to 25

Cork 1

0.1 to 0.2

30 to 60

0.005 to 0.020

0.5 to 5Air springs
11Source: VDI 2062 – Sheet 2, 2007 edition as per Tab. 20.10,103
0.03
01
0.01
000,5 20.5 25 656

1010151520252025
Natural frequency f074 Applications
Overview

Elastically mounted heat pump

Pump bearing
Elastically mounted pump

Task:
Vibration-suppressing bearing fordifferent speeds and rotations, elasticconnectors
Advantages:
Natural frequencies from 8 Hz, full-surface bearing, suitable for applying toin-situ concrete

Combined heat and power plant
Foundation bedding

Elastically mounted
air conditioning

Treadmill bearingBenefits:
Reduces structure-borne noise andsecondary airborne noise

Bearing for a combined
heat and power plant
Task:
Decoupling the frame for damping
higher amplitudes
Advantages:
Natural frequencies from 8 Hz,
extremely resistant to chemicals
Benefits:
Reduces structure-borne noise andsecondary airborne noise, maintenance-free bearings, long service life

Treadmill bearing

Helicopter landing padbearing

Task:
Reduces the level of impact on thejoints and transfer of structure-borne
noise into the building

Task:
Hospitals are protected against disruptive vibrations during landing and takeoff

Advantages:
The required damping is achieved
thanks to the high loss factor. Rapid
elastic recovery makes it suitable foruse on treadmills.

Advantages:
Safeguards against uplift forces,
assembly is quick and easy

Benefits:
Jogging is better for the joints and lessvibrations and pulses are transferred tothe floor and the building

8

Elastically mounted combined
heat and power plant

Benefits:
Elastic bedding with Getzner TFB XT(table foundation on point bearing)allows hospital life to continue without
disruption

A longer service life for a papermaking machine

Maximum decoupling for safety

Bearing for a papermaking
machineMicroscope bearing
Task:
The amplitude on the surface of thefoundation should not exceed 3µm(value 0-P). This guarantees smooth
operation and protects the surroundings from vibration.
Advantages:
Vibration isolation is noticeably more
effective than rubber, especially athigher excitation frequencies, simple
installation.
Benefits:
Smooth operation and consistentprinting quality for the papermaking
machine

Task:
Complete decoupling of the opticalparts of a microscope, protection
against the structural vibrations ofthe building
Advantages:
High damping during movement of theswivel arm, materials can be cut to sizein any geometric shape (for all machinejoints), high damping factor.
Benefits:
Complete vibration decoupling of theoptical system. A stable microscope
image, unaffected by vibrations

A pleasant working environment
close to turbines

Turbine bearing
Task:
The surroundings must be protectedagainst the vibrations of the turbines.
Advantages:
The foundation bedding efficiently
reduces secondary airborne noise,protecting the surrounding buildings
and machines against the vibrations ofthe turbines.
Benefits:
This increases the service life of themachines and the buildings. The noiseand vibration levels are reduced, which
improves working conditions.

On the right, bearing ofan air conditioner:elastic decoupling withSylomer®.
On the left, a helicopter
landing pad in Interlaken:
making sure that “sensitive” buildings staypeaceful95 References

Foundation bearing for the hydropower plant Steigs in Mels (CH)Elastic decoupling of an industrial
washing machine

Strip bearing of a cogeneration plant

References (extract)— Foundation bedding for vacuum pumps, paper mill in Mörrum (SE)— Foundation bedding for a papermaking machine, Kahoku Shimpo Publishing Co. (JP)— Foundation bedding for a steel cutting installation, BRC Spencer, Coatbridge (UK)— Transformer mounting, Electricité de France, Paris (FR)— Gear decoupling, Hanseatische AG wind turbines (DE)— Mounting for a water pumping station, M.C.E. Riyadh (SA)— Mounting for an 18 metric ton, 2 MW combined heat and power plant (DE)— Table foundation bearing for a helicopter landing pad, Interlaken hospital (CH)— Vibration decoupling for combined heat and power plants, GE Jenbacher (AT)— Bedding for HVAC systems, Oslo opera house (NO)— Elastic bedding for textile machines, Lindauer Dornier (DE)— Oil pump bearing for pipeline, Dutch oil company (NL)
— Foundation bedding for generators, EGAT Electricity Generating (TH)— Base plate bedding for a telescope, Cape Girardeau, Missouri (USA)— Lift mountings, Berlin Brandenburg Airport (DE)— Foundation bedding for ball mill, Hebel GmbH, Germering (DE)More on this subject
Rolling mill in Reutte, 1985The rolling mill in Reutte (A) is just one
example of the outstanding durability ofGetzner materials. The foundation has
a full-surface mounting that efficiently
decouples the vibrations of the rollers attheir source. Measurements taken in 1986
and 2013 prove that this solution is maintenance-free. There were no relevant changes
in effect.

Further information:— Increasing value through elastic shieldingof buildings— Construction Mat – Efficient Impact Noise
Insulation— Vibration solutions for technical facilityequipment— Safe vibration isolation in fire-prone areas

Fact sheet “Long-time behaviour of elastically mounted heavy foundations”

You can find the relevant documents at
www.getzner.com/downloads

Cover photo: © photographie-retzlaff.de11

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