Squeaking curves

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Loud squeaking curves of a historic Viennese tram on a special trip

In rail vehicles, curve squeak is the wheel-rail noise that occurs when the wheels slide sideways on small curve radii. Curve noises such as the squeaking of curves occur when driving on narrow curves and switches, when the wheels have to cover different distances at the same time due to the difference in the curve radii of the two rails. But since they are rigidly connected via the axle, this cannot be done without slippage. In the case of curved tracks with very small radii, there is also the noise-producing run-up of the wheel flange .

Noise level

  • Tram, on the outer wheel rim, at 20 km / h, in axial direction, 85 dB (A)
  • Tram, on the inner wheel rim, at 20 km / h, in axial direction, 130 dB (A)

frequency

  • mostly in the range of 1500–6000 Hz
  • approx. 1578 Hz, at 14 km / h and approx. 1572 Hz, at 28 km / h

Speed ​​dependence

  • Start of squeaking from 14 km / h
  • Squeaking from 28 km / h

Noise reduction potential

  • Use of rubber-sprung wheels, 10–15 dB (A)
  • Use of wheel noise absorbers , 15–30 dB (A)
  • active or passive radial setting bogies
  • No rigid wheel axles (enables different rotational speeds on inner and outer radii)
  • Enlargement of the curve radii to greater than 200 or 500 m, curve radii of less than 500 m generate mathematically around 3 dB (A) and curve radii of less than 300 m around 8 dB (A) noise.
  • Rail lubrication / irrigation, up to 25 dB (A)
  • Rail attenuation, 12–20 dB (A)
  • Noise-canceling anti- noise, broadcast near the source of the noise

literature

  • Horst Huebner: Suppression of stick-slip induced curve noises on railroad tracks through physical-chemical surface treatment . Dissertation TU Berlin. Berlin 1973.
  • Klaus Lipinsky: Laboratory studies to clarify the mechanisms of origin and possibilities of influencing the arc noise in rail-bound local transport . Dissertation TU Berlin. Berlin 1984.
  • F. Krüger: Squeaking curves in local traffic . STUVA 1994, research report FE no. 70413/93.
  • T. Gerlach et al .: The development and state of the art of systems for the reduction of sound emissions from rolling noise and squeaking in curves . 9th International Rail Vehicle Conference. Dresden 2008.

Individual evidence

  1. ^ A b Richard Gunacker: Squeaking curves and the possibility of avoiding them . In: Local transport . Issue 6, 2014, pp. 23–25 ( digitized version (PDF) [accessed December 8, 2015]).
  2. ↑ a b c d e f Yacin Ben Othman: Curve screeching from trams. Causes and countermeasures. (PDF) (No longer available online.) Archived from the original on December 10, 2015 ; Retrieved December 8, 2015 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.fv-leiserverkehr.de
  3. ↑ a b c d Michael Beitelschmidt: Damping of wheel and structural vibrations . (PDF) (No longer available online.) November 24, 2011, archived from the original on December 8, 2015 ; Retrieved December 8, 2015 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.fv-leiserverkehr.de
  4. ↑ U. Lenz: Is the tram too loud in curved tracks? (PDF) (No longer available online.) Archived from the original on December 8, 2015 ; Retrieved December 8, 2015 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.fv-leiserverkehr.de
  5. ↑ Drucksache 16/14 392. Small question from the MPs Claudia Hämmerling (Bündnis 90 / Die Grünen) of November 19, 2010 and answer. (PDF) Berlin House of Representatives, December 23, 2010, accessed December 8, 2015 .