空调室外机钣金结构辐射噪声分析与优化.pdf

第 41 卷 第 2 期 Vol. 41, No. 2
2022suction and discharge process. Establish a finite element model of the outdoor unit, apply twice
fundamental frequency torque, calculate the frequency response of the unit using the modal superposition
method. Using the modal testing and analysis, it is preliminarily determined that there is resonance at
the metal structure near 176 Hz, resulting in an abnormally twice fundamental frequency at the measuring
position. Based on the indirect boundary element method, the frequency response calculation result of the
finite element model is imported into the acoustic simulation software, and the acoustic contribution of the 6
parts of the sheet metal frame to the measuring point is further calculated, and it is finally determined that
the resonance of the back plate, partition plate, and front panel causes excessively high frequency peak at the
measuring point. Based on the topography optimization technology, optimize the profile of the back plate to in-
crease the natural frequency from 172 Hz to Hz, which in turn avoids resonance of back plate; at the same
2021-03-14 收稿; 2021-06-21 定稿
作者简介: 杜明龙 (1985– ), 男, 山东高密人, 硕士, 研究方向: 空调减振降噪技术。
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