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Accelerometer measurements of tire carcass vibrations and implications to tire-pavement noise

Accelerometer measurements of tire carcass vibrations and implications to tire-pavement noise. Tyler Dare Purdue University Robert Bernhard University of Notre Dame. Tire-pavement noise modeling. Predicted. Measured. SPL. freq. SPL. freq. Pavement parameters. Predicted. Measured.

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Accelerometer measurements of tire carcass vibrations and implications to tire-pavement noise

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  1. Accelerometer measurements of tire carcass vibrations and implications to tire-pavement noise Tyler Dare Purdue University Robert Bernhard University of Notre Dame

  2. Tire-pavement noise modeling

  3. Predicted Measured SPL freq SPL freq

  4. Pavement parameters Predicted Measured Tire parameters SPL Vehicle conditions freq SPL Atmospheric conditions freq

  5. Noise prediction Noise measurement Vibration model

  6. The problem

  7. Propagation effects Sound absorption Noise prediction Noise measurement Vibration model Background noise Air pumping noise

  8. Propagation effects Sound absorption Noise prediction Vibration measurement Noise measurement Vibration model Background noise Air pumping noise

  9. Vibration measurement

  10. Laser Doppler vibrometry

  11. Advantages Disadvantages Laser Doppler vibrometry Non-contact No field measurements Single spatial point No data from contact patch

  12. Embedded accelerometer

  13. a Embedded accelerometer t

  14. Advantages Disadvantages Embedded accelerometer Data in contact patch Mass-loading effect Field surfaces can be measured Modification of tire Results difficult to interpret

  15. Can the disadvantages of accelerometer methods be overcome?

  16. Advantages Disadvantages Embedded accelerometer Data in contact patch Mass-loading effect Field surfaces can be measured Modification of tire Results difficult to interpret

  17. 0.2 grams Disadvantages Embedded accelerometer Mass-loading effect Mass-loading effect a Modification of tire Modification of tire t Results difficult to interpret

  18. On-board sound intensity probe

  19. Triggering system

  20. acceleration t wheel trigger t

  21. acceleration t wheel trigger t

  22. acceleration t wheel trigger t pavement trigger t

  23. Trailing edge Exit of contact patch Entrance of contact patch Leading edge

  24. Application

  25. Wheel-slap noise Contraction joints

  26. What causes the noise? Wheel-slap noise

  27. Speed coefficients Speed coefficient Lnoise = nLs Sound power Vehicle speed n = 0 Resonance n = 2–3 Tread block vibrations n = 4–5 Air pumping

  28. 800 Hz one-third octave band wheel-slap noise

  29. 800 Hz one-third octave band wheel-slap noise

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