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Noise Reduction in the Wheel/Rail-System by
Application of Rail Head Treatment Products
Tramway-Seminar Tours, France, 18.-19. November
2002
Updated version of the paper presented on behalf
of the 4th Rail Vehicle Conference, Dresden,
Germany, 18.-20. October 2000 Dipl.-Ing. Harald
Willrich FUCHS LUBRITECH GmbH, D-67685
Weilerbach
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Noise Reduction in the Wheel/Rail-System by
Application of Rail Head Treatment Products

• Application
• Consumption quantities
• Results
• Conclusions

• Content
• Problem
• Reasons
• Solution
• Products

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• Problem
• Wheel Squeal when travelling through curves
• Disturbing noises with high frequencies
• Molestion of people living near the track
• high costs for noise preventing measures
• additionally wear on wheels and rails
• Keyword corrugation
• costs for maintenance of vehicles and track

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• Reason
• different distances for inner and outer wheel
  when travelling through narrow curves, which
  cannot be egalized by the different rolling radii
• distorsion of the axles
• differential longitudinal creep forces
• Stick-slip-Effects, normally on the low rail
• also lateral creep forces

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• Solution
• steered wheel sets better adaptation of the
  bogie axles to the curve radius
• disadvantage high costs, reduces only wheel
  flange wear
• Single wheel suspension nearly no longitudinal
  creep forces, but higher lateral creep forces

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• Solution
• Noises are produced in the Wheel/rail contact
  area
• Countermeasures have to be set exactly there
• Rail Head Treatment with appropriate products
• Braking and Traction forces have to be maintained
• Transmission of electric signals must not be
  influenced

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Products TRAM-SILENCE TRAM-SILENCE 00 Base
oil native synthetic Thickener Ca-soap inorgan
ic Solids Metal powder, Graphite
Properties - biodegradable - very adhesive -
extremly pressure resistant - wide temperature
range - easy to apply
- constant friction coefficient - wear
reducing - good corrosion protection - water
resistant
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Sprayability of TRAM-SILENCE 00
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Sprayability of TRAM-SILENCE 00
System Beka Fluilub
System Rebs
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Friction coefficients
Tannert-test no Stick-slip, constant level
of friction after running-in friction value
0,085 resp. 0,143
Almen-Wieland-test Scuffing load gt 18
kN friction value 0,144 resp. 0,140
SRV-test constant friction level friction
level 0,124 resp. 0,138
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Friction coefficients
Tannert-test
TRAM-SILENCE
TRAM-SILENCE 00
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Consumption quantities

• As much as necessary, as few as possible
• manual application depending on local
  conditions, Spots of lubricant in a distance of
  1-2 m, beginning 10-20 m before the curve starts

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Consumption quantities

• Track-side systems Qunatity is normally
  determined by the lubricator, appr. 1 g per
  cycle, split on several outlets, controlling by
  activation of the lubricator
• On-board systems depending on local conditions
  quantities between 10 and 100 mg per meter of
  track

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Consumption quantities

• Depending on local conditions, for examples curve
  radius, condition of wheel and rail, weather etc.
• Braking behaviour, traction and train detection
  must not be influenced
• No risk for individual traffic crossing the track

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Results

• When applied properly, all requirements are
  fulfilled
• Braking distance is not increased
• Traction is maintained
• Signalling is not affected
• No influence on isolating joints
• Wheel squeal is dramatically reduced
• wear is reduced
• Individual traffic is not endangered

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Results
Excerpt from an test report of Dutch Railway NS
about TRAM-SILENCE In the quantities tested in
this examination (0,04 g/m und 0,1 g/m) the
product is safe. Braking behaviour is not worse
than on wet rails and detection behaviour is ok.
The noise reducing effect could be proved. With
the used WOERNER-lubricator the product could be
applied reproducable.
Amsterdam 1998
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Results
Excerpt from an test report of Hamburger Hochbahn
AG (Metro Hamburg) about TRAM-SILENCE When
using TRAM-SILENCE as a top-of-the-rail wetting
agent and observing certain boundary conditions,
the braking distances do not exceed the limit
values according to BOStrab (German Tramway
Guidelines).
Hamburg, 2000
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Results
Remarkable reduction of squealing noise
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Conclusion

• Application will be done more and more by means
  of automatic lubricators.
• In the meantime a number of appropriate
  lubricators are available.
• Selection of the most suitable system depends on
  local conditions.
• Optimum consumption rates have to be found by
  field tests.
• Further investigation on the corrugation problem
• Wheel-squeal should no longer be a problem!

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Thank you very much for your attention
www.fuchs-lubritech.de