关键词: 驾驶室, 边界元, 结构噪声, 正交试验

Abstract: To reduce the effect of lowfrequency structural noise in the cab on the sound pressure near the drivers ears, the structure with the largest acoustic contribution was improved by combining the results of the acoustic contribution and the orthogonal test method. Acoustic response analysis was carried out by establishing a tractor cab acousticstructure coupling model and a boundary element model and verified through experiments. The structure with the largest contribution to the field point sound pressure was improved, and the structural improvement parameters were determined by the orthogonal test method. The improvement method takes the total sound pressure at the drivers ear as the indicator. The test obtained the most effective combination of structural parameter improvement H3T3D1 for reducing the sound pressure at the drivers ear, with the right baffle applying 25 mm reinforcing ribs, the right window adding 3 mm damping, and the front windshield thickening by 1 mm, which reduces the total sound pressure of the sound point by 7.74 dB. There is basically no new sound pressure while reducing the original sound pressure peak. The peak value has a good noise reduction effect, and the research results can provide a reference for controlling tractor structure noise.

Key words:  cab, boundary element, structure noise, orthogonal experiment