Study of the Generation mechanism for Abnormal Exhaust Noise Nissan Motor Company, Limited

Format:

Conference/Event

Author/Creator:

Okada, Makoto, author.

Conference Name:

Passenger Car Meeting and Exposition (1987-10-19 : Dearborn, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1987

Summary:

Based on experimental analysis, the generation mechanism of abnormal exhaust noise which is characterized by an intermittent high frequency aetallic sound, is clarified by bench testing of a FWD vehicle.The noise is caused by large amplitude pressure waves (finite amplitude waves) in the exhaust pipe. They are amplified due to interference between reflected waves and subsequent waves from the engine, and are finally transformed into shock waves in the propagation process along the exhaust pipe, resulting in abnormal exhaust noise. By theoretical analysis of finite amplitude waves, the wave profile in the propagation process and the transition distance to the shock wave can be solved analytically where the assumptions of mass, momentum, and energy conservation are valid, until the moment of shock wave formation. The transition distance is a key parameter in analyzing the growth and existence of shock waves. This paper proposes a simulation method for estimating the transition distance which enables the generation of abnormal exhaust noise

Notes:

Vendor supplied data

Publisher Number:

871924

Access Restriction:

Restricted for use by site license