| 摘要 |
In a vehicle with an engine, an engine air flow system for attenuating engine noise comprising: a first flow path of air intake through which a first gas flow is substantially into the engine; a second flow path of engine exhaust in which a second gas flow is substantially out of the engine; and at least one duct in flow contact with at least one of the first and second flow paths, wherein the duct comprises: a tubular fluid flow passage; at least one open end connecting the tubular fluid flow passage to the at least one of the first and second flow paths; a support structure preventing radial collapse of the duct during occurrences of a negative pressures, caused by the engine, within the duct; and a pliant material attached to the support structure forming a gas-tight tubular duct wall for the tubular fluid flow passage, wherein the pliant material forms, on the support structure, a series of loosely pliant panels that freely move radially outwardly and inwardly, wherein during engine operation sound generating vibrations of air into one of the first and second flow passages cause the loosely pliant panels to vibrate in a direction radial with respect to the duct, wherein a detectable level of audible sound radiated by the engine is attenuated by the duct.
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