| 摘要 |
#CMT# #/CMT# The device has perforated walls (11a, 11b) connected with acoustic absorption cavities (12a, 12b). An acoustic resonance cavity (1) has a wall (19), whose part is provided with a perforation so as to form the perforated walls. Absorbing foam materials are filled in the absorption cavities. A primary layer of one of the materials is arranged against a bottom wall of the absorption cavities. A secondary layer of the other material is arranged against the perforated wall of the absorption cavities. #CMT#USE : #/CMT# Device for controlling acoustic energy generated in an acoustic resonance cavity in a door leaf of a motor vehicle (claimed). #CMT#ADVANTAGE : #/CMT# The design of the device controls the acoustic energy generated in the acoustic resonance cavity in the door leaf of the motor vehicle effectively in order to decrease the aerodynamic noise generated between the tires and the roadway, inside the passenger compartment of the vehicle, thus providing comfort to the passenger compartment of the vehicle. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of an acoustic resonance cavity in a door leaf of a motor vehicle. 1 : Acoustic resonance cavity 11a, 11b : Perforated walls 12a, 12b : Acoustic absorption cavities 19 : Acoustic resonance cavity's wall. |
