Passive noise control (PNC) mainly focuses on the noise source and propagation path to control the noise. Generally, using an acoustic package and sound and vibration isolation structures could prevent noise from propagating into the vehicle. PNC technology has been developed extensively and formed a relatively mature theoretical system. It has become an important branch in interior noise control due to its simple implementation structure and good system stability. This chapter addresses three major areas of PNC technology: (1) sound insulation materials, (2) sound absorption materials, and (3) acoustic metamaterials. First, the basis of fundamental theory and law of these series materials have been conducted to optimize the structure design. This chapter mainly focuses on the recent research progress for multilayer sound-absorbing structures, which have excellent sound absorption properties at medium and low frequencies. Meanwhile, acoustic metamaterials have been introduced to overcome the shortcoming of traditional sound absorption technology that it cannot play a significant role in the low-frequency noise below 400 Hz. So, a new optimal method for PNC technology in low-frequency noise is emerging.
Passive Noise Control for Vehicle
Vehicle Interior Sound Quality ; Kapitel : 5 ; 117-142
2022-09-08
26 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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