| 摘要 |
FIELD: transport.SUBSTANCE: set of inventions relates to transport engineering. Sound-insulating part of trim contains one area with predominantly sound-absorbing characteristics - absorbing area. The absorbing area contains one porous fibrous layer and one other area with mass-spring acoustic characteristics - insulating area. The insulating area consists of mass layer and separating layer. The mass layer consists of impermeable protective layer and the same porous fibrous layer as the absorbing area in the insulating area regulated according to Young's modulus (Pa): 96?AW?t, where AW is specific weight (g/m), t is width (mm) of porous fibrous layer. Impermeable thin protective layer is located between porous fibrous layer and separating layer, and all the layers are couched together. Thickness of porous fibrous layer in absorbing area is greater than thickness of the same layer in insulating area. The mentioned sound-absorbing part of trim is used in automobile part such as inner panel, floor covering or wheel insert in a vehicle, for instance in passenger car or truck.EFFECT: lower noise in a vehicle.9 cl, 11 dwg |
