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 The spectrum of a tuning fork (“clear”) The spectrum of a recorder (consists of peaks) The spectrum of the noise of a car (“dirty”) Different kind of spectrums:

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

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

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

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

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

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

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

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

23. woodglass plastic foamglass in frame

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

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!