A Study on Mechanism of Intake Rumble Noise and Optimization of Intake Manifold

摘要

The rumble noise from intake manifold of an automotive engine is important in view of the sound quality and the passenger's comfort. This article presents the mechanism of intake rumble noise and the optimization process of the shape of intake manifold to reduce the noise. Simple analysis authenticates the initial hypothesis on the mechanism of intake rumble noise, which is also verified by numerical analysis and experiment. Compared to the basic manifold, the modified manifold mitigates half-order harmonics of intake noise, consequently improving the sound quality of interior noise.