초록 ▼

An engine enclosure (10) has a noise suppression arrangement (15,15a,15b) mounted thereon including a plurality of acoustical energy absorbers (20,20a,20b) and sound reflectors (24,24a,24b) spaced from the absorbers to provide airflow passages (26,26a,26b) therebetween. The noise suppression arrange

An engine enclosure (10) has a noise suppression arrangement (15,15a,15b) mounted thereon including a plurality of acoustical energy absorbers (20,20a,20b) and sound reflectors (24,24a,24b) spaced from the absorbers to provide airflow passages (26,26a,26b) therebetween. The noise suppression arrangement (15,15a,15b) efficiently absorbs and reflects acoustical energy and exhibits a low space to sound absorption efficiency ratio in comparison to conventional noise suppression arrangements.

대표청구항 ▼

In a vehicle of the type comprising an engine enclosure (10) having a noise suppression arrangement (15,15a,15b) mounted thereon, the improvement comprising said noise suppression arrangement (15,15a,15b) including sound attenuating means (16,16a,16b) for permitting the free ingress of ambient air i

In a vehicle of the type comprising an engine enclosure (10) having a noise suppression arrangement (15,15a,15b) mounted thereon, the improvement comprising said noise suppression arrangement (15,15a,15b) including sound attenuating means (16,16a,16b) for permitting the free ingress of ambient air into said enclosure (10) and for intercepting, reflecting and absorbing at least substantially all of the sound waves (S) emanating from within said enclosure (10) by at least substantially providing an optically dense view from within said enclosure (10) to exteriorly thereof, said sound attenuating means (16,16a,16b) including a spaced plurality of acoustical energy absorption means (20,20a,20b) for directly absorbing a substantial portion of said sound waves (S1), and a plurality of separate sound reflecting means (24,24a,24b), cooperating with and each having ends positioned outwardly from and between each adjacent spaced pair of said sound absorption means (20,20a,20b), for providing an unobstructed passage (26,26a,26b) to permit the flow of said ambient air therethrough and for reflecting and absorbing at least substantially all of the remaining portions of said sound waves (S2,S3), each said acoustical energy absorption means (20,20a,20b) and each adjacent said reflecting means (24,24a,24b) being spaced and disposed in nested and overlapped relationship relative to each other so that an imaginary plane (P) at least approximately intersects each of said acoustical energy absorption means (20,20a,20b) and each adjacent said sound reflecting means (24,24a,24b), the outwardly positioned ends of each said reflecting means (24,24a,24b) being spaced outwardly from a respective one of said acoustical energy absorption means (20,20a,20b) both in the direction of said plane (P) and transversely thereof.