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Effect of coupling between passenger compartment and trunk of a car on coupled system natural frequencies using acoustic frequency response function

机译:使用声频响应函数的车厢和行李箱之间的耦合对耦合系统固有频率的影响

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摘要

Conventional numerical techniques, used to study the acoustics of a car passenger cabin, treat the cabin as an isolated cavity excited by the cavity boundaries. Realistically, other cavity volumes such as the trunk communicate with the cabin through the holes in the parcel shelf of the car. An extended acoustic model of a car is formed by the cavity volumes of the passenger compartment and the trunk as well as air leakages through the holes provided for electrical devices and ventilation on the parcel shelf. In this study, the dynamic influence of air leakages between the passenger and trunk compartments on the first and second coupled system modes was investigated experimentally using acoustic frequency response function. The response to the acoustic excitation was measured for four different configurations of trim and holes of the parcel shelf. The natural frequencies of the first and second coupled system modes increased with increasing holes size with and without the trim of the parcel shelf. The experimental results were in good agreement with the reported results of coupling effects of double cavities connected by a neck. In the low frequency region since the wavelength is longer compared to the holes dimension, these holes act as point sources.
机译:用于研究汽车客舱声学的常规数值技术将客舱视为由腔边界激发的隔离腔。实际上,其他空腔体积(例如行李箱)通过汽车包裹架上的孔与机舱连通。汽车的扩展声学模型由乘员舱和行李箱的空腔体积以及通过为电子设备和包裹架上的通风提供的孔的空气泄漏形成。在这项研究中,利用声频响应函数,通过实验研究了乘客舱和行李舱之间漏气对第一和第二耦合系统模式的动态影响。对于包裹架子的装饰和孔的四种不同配置,测量了对声激励的响应。在有和没有包裹架修剪的情况下,第一和第二耦合系统模式的固有频率会随着孔尺寸的增加而增加。实验结果与通过颈部连接的双腔耦合效果的报道结果吻合良好。在低频区域,由于波长比孔尺寸长,因此这些孔充当点源。

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