Prediction of oblique incidence sound absorption coefficient for microfiber sound absorber

摘要

Automotive parts are required to reduce weight and size, and such the task is also necessary for sound absorbers as well. So the microfiber sound absorber with high performance whose fiber diameter is several hundreds nanometers or several micrometers is being used widely. On the other hand, it is important to develop techniques for estimating sound absorbing performance when we design the structure of microfiber sound absorber. However, preceding research is not for estimating oblique incidence sound absorbing coefficient but for estimating normal incidence sound absorbing coefficient. This paper presents numerical calculation and experiment for the oblique incidence sound absorbing coefficient of the microfiber sound absorber in the free sound field, and refers to some considerations on the structure of microfiber sound absorber.