Research on NVH optimization of automotive engine intake system

With the improvement of people's living standards, the demand for NVH performance of cars is also constantly increasing. As the main source of automotive noise, the noise of the engine intake system has become an important research topic in optimizing and controlling automotive noise, and improving the overall NVH performance of the vehicle. Based on the basic structure of the automotive engine intake system, a geometric model of the automotive engine intake system is constructed in CATIA software and imported into Virtual Grid partitioning and simulation analysis are conducted in Lab software, and the results showed that the maximum noise at 10cm of the air inlet without a muffler is about 120dB (A); After adding a full muffler, the noise at the air inlet is maintained at around 95dB (A), and the noise reduction effect is obvious. Currently, the effect of the 9.6L air filter is basically consistent with that of the 12L air filter muffler. The noise of the 12L air filter scheme is about 5dB (A) lower than that of the 9.6L air filter scheme. Furthermore, two quarter wavelength tubes are added at the empty tube end of the 12L air filter scheme to eliminate resonance frequencies of 300Hz and 700Hz, respectively, in order to optimize the design and achieve a significant overall noise reduction effect.