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Sounds for Electric Vehicles

Sounds for Electric Vehicles. QRTV-06-09. Defining Sounder Criteria Presented by Henry Morgan Edited from paper prepared and presented by Prof. Geoff Leventhall to ISO Apr 2011 Acoustical Consultant geoff@activenoise.co.uk. What Should a Sounder for Quite Cars Achieve?.

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Sounds for Electric Vehicles

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  1. Sounds for Electric Vehicles QRTV-06-09 Defining Sounder Criteria Presented by Henry Morgan Edited from paper prepared and presented by Prof. Geoff Leventhall to ISO Apr 2011 Acoustical Consultant geoff@activenoise.co.uk

  2. What Should a Sounder for Quite Cars Achieve? Safety: Audibility, Locatability, Directivity Environmental: Acceptability,Directivity, Attenuation

  3. Audibility Depends on loudness (phons) or sound pressure level (dBA) compared with background noise Why phons? Tests show that, for equal dBA, broadband sounds are louder than tonal sounds.

  4. Loudness of broadband and tonal back alarms

  5. Directional radiation from a piston source Depends on ratio source diameter to wavelength For 0.1m source, D/lambda = 0.25 at 850Hz D/lambda = 1 at 3400Hz

  6. A-Weighted Directivity Prius Hybrid fitted with Brigade broad band prototype sounder

  7. Limit the directionality

  8. Broadband Sound • Broadband sound contains complete auditory information for location • Greater higher frequency content gives: • greater directivity • greater attenuation

  9. Equal loudness contours range of added sound

  10. White sound

  11. Pink Sound

  12. Band Limited Sound

  13. 500Hz to 3500Hz

  14. A back alarm sound

  15. Multiple tone sound

  16. Pink Broadband sound for EVs

  17. All the sounds White Pink Band limited 1 band limited 2 Back alarm Multiple tone Pink BB for EVs

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