| 摘要 |
<p>An attenuator for the air inlet tract of an internal combustion engine comprises an unobstructed tube 4 having a surrounding enclosure in the form of a drum 9 divided by end plates 10 and baffles 16 into a primary chamber 11 in fluid communication with the inlet tube via apertures or holes in the tube wall, and a secondary chamber 12 in fluid communication with the primary chamber via openings in the baffle. Two secondary chambers 12, 13 each associated with the primary chamber may be provided. The arrangement can be tuned to attenuate a wide range of frequencies. The arrangement may also be suitable for use for other non automotive applications where a fluid such as air passes through a duct.</p> |
