Intake system noise is one of the main noise sources of automobiles, and it is of great significance to control and optimize it. The intake noise is caused by the pressure fluctuations caused by the periodic opening and closing of the intake valve and the high-speed airflow flowing through the intake valve passage during the intake process. Depending on the generation mechanism, the intake noise mainly includes the following: periodic pressure pulsation noise, eddy current noise, Helmholtz resonance noise of the cylinder and air column resonance noise of the intake pipe; air filter and Helmholtz muffler noise The wall plate is very thin, and it is easy to be excited and cause radiated noise when high-speed airflow passes through it. The acoustic performance of the air intake system is affected by factors such as the muffling volume, the cross-sectional area of the pipe, and the position of the air intake pipe.