A numerical structural-acoustic approach to analysis of interior booming noise and noise reduction in an all-terrain tractor cabin

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A numerical structural-acoustic approach to analysis of interior booming noise and noise reduction in an all-terrain tractor cabin

Dai, Liming / Cao, Ji

The booming noise in an all-terrain tractor cabin is studied in this research via a numerical structural-acoustic approach. Cavity acoustic resonances of the cabin are evaluated, and the acoustic resonant frequencies are identified and quantified in the research. The noise level inside the cabin is determined, and the frequencies characterized by peak noise levels within the booming noise frequency range are identified. The influences of sound absorption, structural damping, added mass and structural stiffener on the acoustic response of the cabin are quantified. A discussion on the measures to control the booming noise inside the cabin is also provided. It can be shown that the techniques presented in this research provide useful acoustic assessment tools for vehicle designs at the stage of Noise, Vibration, Harshness (NVH) analysis, especially for vehicle designs in which low frequency noise reduction in vehicle cabins is required. The coupled structural-acoustic model established in the research can be applied to determine cavity resonances. This structural-acoustic model has been proven to be efficient in analysing the vibration-induced noise in a vehicle cabin.