The work aims to investigate the vibration-acoustic radiation characteristics and the optimization rules of hole layouts for packaging isolation plates with different hole types, to provide new ideas and theoretical basis for vibration and noise reduction in the material reduction design of metal plates. Three aluminum alloy-based isolation plates with multi-shaped hole structures (circular holes, square holes, and combined holes) were designed. A finite element model was established, and the natural frequencies, mode shapes, vibration transmission characteristics, and equivalent radiated power levels of the three isolation plates were systematically analyzed by integrating modal analysis theory and the mode superposition method. The first six-order modal shape contours of the three isolation plates were consistent, while the differences in natural frequencies gradually expanded with the increase of modal orders. Within the frequency range of 0-80 Hz, the equivalent radiated power level increased monotonically with the frequency: the level of Plate a rose from 92.18 dB to 132.55 dB (an increase of 40.37 dB), Plate b exhibited slightly higher levels across the entire frequency range, and Plate c showed intermediate performance. Combined with the Helmholtz resonance model, Plate a achieved the optimal noise reduction effect within 0-80 Hz. The circular-hole plate shows strong suppression of vertical vibration, the square-hole plate has a more balanced coupling between in-plane and vertical vibrations, and the combined-hole plate is most sensitive to vertical vibration responses. The equivalent radiated power level increases monotonically with the frequency. The circular-hole plate presents relatively optimal noise radiation in the conventional frequency range, the square-hole plate has slightly stronger radiation, and the combined-hole plate shows intermediate performance, achieving a noise reduction effect of approximately 2 dB at specific characteristic frequencies.
Key words
packaging isolation plate /
layout optimization /
noise reduction design
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