On noise reduction of motorcycle helmets

Terzioglu F., Özer M. S., Öztürk S.

46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, Hong Kong, Çin, 27 - 30 Ağustos 2017, cilt.2017-January, (Tam Metin Bildiri) identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 2017-January
  • Basıldığı Şehir: Hong Kong
  • Basıldığı Ülke: Çin
  • Anahtar Kelimeler: Insertion loss, Noise measurement, Noise reduction
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Hayır

Özet

Motorcycle helmets are mandatory on the safe driving, in spite of that the helmet usage rate decreases by the reason of discomfort. One of the most common complaints of the drivers is noise in the helmet. The noise may be structural bourne or air bourne. In this paper, measurements were performed to determine the external noise reduction of the motorcycle helmets, which is a preliminary study to improve the sound quality. The measurements were carried out on a specially designed field to provide a controlled acoustic environment. A Head & Torso simulator was used to measure noise in the built cabinet that produced by an omnidirectional sound source. The in-cab calibration was provided by in-house microphones. The excitation sounds were generated by using special software on the computer and the output was transmitted to the speaker cabinet via a sound card connected to an amplifier. Two types of motorcycle helmets were tested and the sound reduction results were compared.