Experimental Evaluation on Noise Reduction Performance of a Motorcycle Helmet

Yıl 2019, Cilt: 8 Sayı: 3, 125 - 133, 31.10.2019

Mehmet Sait Özer Furkan Terzioğlu Sinem Öztürk

https://doi.org/10.18245/ijaet.566705

Öz

Anahtar Kelimeler

Kask, Ses azalımı, Deneysel Akustik

Experimental evaluation on noise reduction performance of a motorcycle helmet

Öz

Motorcycle helmets are generally thought to be
only protection of motorcycle drivers against head injuries as well as loud
noise in traffic. While there have been several papers on noise elimination
capabilities of motorcycle helmets, no controlled study has been reported to
compare different types of test conditions in literature. The purpose of this
study is to assess noise reduction capacities of a motorcycle helmet under
different types of acoustical loadings as well as environments and to identify
better test condition. Firstly, a Head & Torso simulator with and without
the motorcycle helmet in a built acoustical cabinet was exposed to digitally
generated sound to investigate insertion loss values. Besides, the Head &
Torso simulator was fixed onto a motorcycle to simulate actual driving
conditions. Sound pressure levels were captured at the ear level to obtain
insertion loss values in case of motorcycle noise for different engine speeds.
By comparing calculated insertion losses, it was revealed that considerable
differences existed between tests for different conditions. Beneficial
interpretations were deduced and thus, a practical solution was presented for
accurate measurements acoustic performance of the motorcycle helmets in laboratory
conditions.

Anahtar Kelimeler

Insertion loss, Motorcycle helmet, Helmet acoustic, Noise reduction, Experimental acoustic

Kaynakça

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