Rolling noise
When rolling noise is generally described as the noise that the rolling of the wheels of vehicles on the road or rail is formed. More precise and unambiguous terms for these external noises are tire-road noise and wheel-rail noise . These terms have become increasingly popular, mainly among acousticians in vehicle, tire and roadway development. For road traffic noise and rail traffic noise as an environmental problem, however, the unspecific term rolling noise is still often used, e.g. B. the measurement of tire-road noise is often referred to as rolling noise measurement.
In motor vehicle development, the interior noise introduced into the vehicle via structure-borne noise from tire-road contact is often referred to as rolling noise (the term tire-road noise is not used in this context). Here, the low-frequency force excitations on the tire caused by the road represent the decisive mechanism. These occur primarily in the vertical direction and are transmitted via the axles and the body as structure-borne noise. For the isolated investigation of these components of the interior noise, drum test stands with blow bars or roadway profiles, as well as servo-hydraulic vehicle test stands are used.
Noise level, initial situation
- 96 dB (A) for today's freight wagons (without whisper brakes, without rubber-buffered tires, without wheel sound absorbers) measured at 80 km / h and at a measuring distance of 7.5 m from the freight wagon
Noise limit values for tires
Noise limit values from 2012 according to EU Regulation No. 661/2009:
| Tire class | Nominal width | Limit values |
|---|---|---|
| C1a | <= 185 mm | 70 dB (A) |
| C1b | > 185… 215 mm | 71 dB (A) |
| C1c | > 215… 245 mm | 71 dB (A) |
| C1d | > 245… 275 mm | 72 dB (A) |
| C1e | > 276 mm | 74 dB (A) |
| C2 | - | 72 [73] dB (A) |
| C3 | - | 73 [75] dB (A) |
- Values in [] brackets apply to traction tires.
Noise reduction potential
Rolling noise in rail vehicles
- Replacement of gray cast iron brake blocks with K-blocks ( whisper brake ), 8 to 10 dB (A)
- Wheel noise absorber , 2 to 8 dB (A)
- optimized wheel shape, 2 to 6 dB (A)
- rubber-sprung wheels, 6 dB (A)
- Use of completely newly developed bogies such as B. the LEILA bogie, up to 25 dB (A)
- Noise-canceling anti- noise, broadcast near the source of the noise
- optimized superstructure (wagon case), 2 to 4 dB (A)
- Frequent rail grinding, 3 to 5 dB (A), (however, additional noise is counterproductive during the grinding process)
See also
swell
- ↑ Hans-Hermann Braess; Ulrich Seiffert (editor): Vieweg Handbook Automotive Technology . Vieweg and Teubner; 5th edition, 2007; ISBN 978-3834802224 .
- ↑ M. Riegel; J. Wiedemann: Determination of the proportion of wind noise in comparison to drive and rolling noise in the interior of cars . In: M. Bargende; J. Wiedemann, (Ed.): 5th International Stuttgart Symposium Automotive and Internal Combustion Engines 18.-20. February 2003. Renningen: Expert-Verlag, 2003. ISBN 3-8169-2180-9 .
- ^ Wilhelm Dreyer; Peter Hoppe; Peter Friederich; Helmut Fuchs: The new Volkswagen Acoustics Center in Wolfsburg, Part 1: Test benches . Automobiltechnische Zeitschrift, Volume 105, Issue 3, 2003.
- ↑ R. Ries; M. helper; U. Essers: Use of servohydraulic road simulators for the investigation of rolling noise in cars . In: Automobiltechnische Zeitschrift 95 (1993), No. 1, pp. 42-45.
- ↑ http://www.forschungsinformationssystem.de/servlet/is/35928/
- ↑ a b c d e f Archived copy ( Memento of the original dated December 8, 2015 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ http://www.bochumer-verein.de/de-DE/produkte/gummigefederte_raeder/Seiten/default.aspx
- ↑ http://www.schienenlaerm.de/fileadmin/bvs/daten/vernetzen/Bericht-Gumpp.pdf
