Traffic noises and its abatement

1. Traffic noises and its abatement Baár-Madas Secondary School Budapest, Hungary

2. Our aims are • to make noise maps to determine the noise load of interesting areas • to analyze the traffic noises more deeply • to explore the psychical effects • to give recommendation for “proper” noise abatements

3. Achieved investigations • Producing noise maps of significant areas of Budapest (till now Moszkva tér) • Spectral analysis of noises generated by the traffic • Test noise abatement materials in use

4. Noise map of Moszkva tér • We gave a complex answer of a noise load of a major traffic junction • measuring average, maximum and variance • analyse the change in space and time • explore the effects of environment • We plotted 2D noise maps

5. Noise map of Moszkva tér

6. The hot points (noise > 75 dB)

7. Reduction effect of the environment

8. The time evolution of the noise at a typical weekday

9. Achieved investigations • Producing noise maps of significant areas of Budapest (till now Moszkva tér) • Spectral analysis of noises generated by the traffic

10. Spectral analysis of noises • Spectral analysis (Fourier transformation): decomposes the noises to sum of sound waves with different frequencies (deep, middle and high voices) • Mathematically: the original function the Fourier-transformed

11. Spectral analysis of noises Different kind of spectrums: • The spectrum of a tuning fork (“clear”) • The spectrum of a recorder (consists of peaks) • The spectrum of the noise of a car (“dirty”)

12. Spectral analysis of a car car intensity frequency [Hz]

13. Spectral analysis of a car car deep voices components intensity frequency [Hz]

14. Spectral analysis of a car car middle voices components intensity frequency [Hz]

15. Spectral analysis of a car car high voices components intensity frequency [Hz]

16. Other spectrums bus higher intensity at low, lower intensity at high freq. components intensity frequency [Hz]

17. Other spectrums truck very large deep components intensity frequency [Hz]

18. Achieved investigations • Producing noise maps of significant areas of Budapest (till now Moszkva tér) • Spectral analysis of noises generated by the traffic • Test noise abatement materials in use

19. Testing noise abatement materials • We evaluated the effectiveness of some noise reduction materials in two different respects: • the noise reduction capabilities • the spectral characteristic of the reduction • We want to find the advantages, disadvantages and common problems

20. Our test layout

21. Spectral noise abatement of glass with abatement without abatement intensity frequency [Hz]

22. Spectral noise abatement of glass poor reducing at low, effective reducing at high frequencies intensity frequency [Hz]

23. wood glass plastic foam glass in frame

24. The common problem: Bad abatement capability at low frequencies glass The question: What are the good materials? How can we make them? ` glass in frame

25. Planned investigations • Psychical effect of noises • Define the characteristic features of“proper” noise abatement • Testing the noise reduction walls in use • noise attenuation capabilities • spectral characteristic • Comparing the special national regulations in this field

26. Participants • Hinsenkamp Anett • Lipták György • Mészáros Bence • Papp Ádám • Török Csaba

27. Thank you for your kind attention!