Air noise absorbing form part

摘要

The air noise absorbing form part comprises a first and a second layer consisting of at least one fleece material layer. The layers are arranged next to one another in the direction of the incoming air noise for formation of at least one hollow space. The layers are arranged in a functional technique series arrangement supported one on the other. The second layer turned away from the air noise has a greater flow resistance than the first layer facing the air noise. The flow resistance of the second layer (2) is 1.25 to 5 times greater than that of the first layer (1) and the first layer has a flow resistance of 40 to 80 and the second layer has a flow resistance of 90 to 150 Rayl.