整车进气系统噪声研究及控制

Investigation and Control of Vehicle Intake System Noise

针对某款车在加速工况下,发动机转速在3 600 r/min左右车内出现轰鸣噪声,文章利用试验和CAE相结合的方法,明确进气系统存在120 Hz声模态和空滤支架安装点动刚度不足是产生车内轰鸣声的要因。通过提升空滤支架安装点动刚度,出气管设计120 Hz谐振腔,降低了问题转速的噪声峰值,主观评价轰鸣声改善明显。另外,针对出气管隔振波纹的隔振方向对车内噪声的影响进行了研究,试验验证隔振波纹解耦对车内噪声峰值有2 dB(A)的优化效果,此优化方向为工程化控制和解决进气系统噪声问题提供了有效可行的新思路。

In a certain vehicle,the engine noise is roaring at an engine speed of about 3 600 r/min.In this paper,the combination of test and CAE is used to obtain the 120 Hz acoustic mode of the intake system,and the lack of jog stiffness of the air filter bracket is found to be the main cause of the roaring sound in the car.By installing the jog stiffness of the air filter bracket,the outlet pipe is designed with a 120 Hz resonant cavity,thereby reducing the peak value of the problem speed noise,and the subjective evaluation of the roaring sound is improved significantly.In this paper,the influence of the vibration isolation direction of the air-tube vibration isolation on the interior noise is studied.The test verifies that the vibration isolation ripple decoupling has a 2 dB(A)optimization effect on the interior noise peak,which provides an effective and feasible new idea for engineering control and solving the problem of air intake system noise.