The Optimal Design Of Vehicle’s Intake System Based On Dynamic Acoustic Property

With the development of the domestic auto industry, and the improvement of people’s living standards, the requirements of this means of transport cars are increasingly high. Automotive noise and vibration levels will directly affect the comfort of the driver in the car, and the noise itself is also a source of pollution for the urban environment. Wherein the intake noise is one of the main noises of the vehicle, a method for controlling the intake noise is generally used to adjust the intake system structure or increase the muffler component.In this paper, through a method of combining with experimental analysis, numerical simulation and theoretical calculations, optimize the intake system of a sample vehicle. Firstly, learn the acoustic characteristics of intake noise through the generation mechanism of intake noise, and determine how to identify intake noise with experimental analysis. Based on intake noise principle of sound pressure superposition, through experiments test vehicle interior noise levels under the intake noise shielded and non-shielded conditions. And then analyze the noise in the car to identify the intake noise components according to order tracking analysis. For the intake system research, it is necessary to consider its structure-acoustic coupling performance. In the paper, the modal frequencies and mode shapes and tunes of the intake system modal and vibration mode are calculated with LMS Virtual. Lab, based on Acoustics FEM simulation.At the same time, through simulation transmission loss of the intake system is predicted. According to the simulation analysis, it can be concluded that the probability of the occurrence of the intake system structure-acoustic coupling resonance is very small. On the other hand, according to the transmission loss, a muffler with corresponding frequency needs to be added to improve the noise elimination properties. From the experimental results and the simulation, based on the principle of Helmholtz resonator silencer, design simple resonators with frequency corresponding to the intake noise.Further, validate the designed resonator in intake system through experiment and select a best optimization program by experimental verification.In this paper, through the optimal design for the intake system of an experimental vehicle, the intake noise identification and control methods are in-depth studied. Combining computer simulation technology and experimental testing, analyze intake noise frequency. And through designing and installing Helmholtz resonator, reach the purpose of noise reduction.