Device for reducing noise level in road vehicle engine compartment
摘要
An opening (5) of the tube is arranged in the area of a vibration maximum. The effective frequency of the resonator (2) is adjustable and its control is dependent upon the speed of the engine of the vehicle in its compartment (20). The one-sided closed tube has variable length (L1), the length variation being by means of a piston movably located in the tube.
申请公布号
DE19755750(A1)
申请公布日期
1999.07.29
申请号
DE19971055750
申请日期
1997.12.16
申请人
DR.ING.H.C. F. PORSCHE AG, 70435 STUTTGART, DE
发明人
EISENHAUER, EGON, 71296 HEIMSHEIM, DE;LANGE, CHRISTIAN, DIPL.-ING., 75446 WIERNSHEIM, DE
