NOISE SUPPRESSION SYSTEM

摘要

A noise suppression system for an air-cooled internal combustion engine is disclosed. The system may include an acoustically designed shroud forming a cavity and configured for attenuating noise produced by a cooling air fan associated with the engine. In one system, the shroud is mountable on a housing of the air fan. A pair of air inlet passages may be provided which are operable to draw ambient cooling air into the shroud to the fan. The air inlet passages are acoustically configured and tuned to attenuate noise generated by the fan. In one system, the air inlet passages may each be formed in a rear quadrant of the shroud. Various configurations of the shroud may include quarter wave resonators and/or micro-perforated panels to further attenuate fan noise.

主权项

1. A noise suppression shroud for an engine, the shroud comprising:
a body having a lower portion configured for mounting on a blower housing of the engine and an upper portion; a cavity formed in the body; and a quarter wave resonator disposed in the cavity and tuned to attenuate noise within a first range of frequencies generated by a fan within the blower housing.