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研究了乘用车结构声腔耦合系统的振型耦合机理,并介绍了其在车内噪声控制中的应用。建立了结构声腔耦合系统并进行了试验验证。计算车内噪声传函,发现50Hz处有一明显峰值。为分析该峰值产生的原因,采用数值方法计算了耦合系统的振型耦合系数(MSCC),发现该峰值主要是由于第1阶声腔模态和第15阶结构模态耦合产生的。基于上述分析,通过车身结构修改,降低了振型耦合系数,最终车内噪声传递在50Hz处取得了5dB的降噪效果。
The mode coupling mechanism of acousto-cavity coupling system in passenger car is studied, and its application in vehicle interior noise control is introduced. The structure acoustic cavity coupling system is established and tested. Calculate the noise inside the car and found a clear peak at 50Hz. To analyze the cause of the peak, the mode coupling coefficient (MSCC) of the coupled system was calculated numerically. It was found that the peak was mainly due to the mode coupling of the first-order acoustic cavity and the fifteenth-order structure. Based on the above analysis, through the modification of the body structure, the mode coupling coefficient is reduced, and finally the noise attenuation in the vehicle achieves a noise reduction effect of 5 dB at 50 Hz.