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基于混合有限元-统计能量法及周期子结构原理,建立了高速列车波纹外地板声学特性仿真模型,根据波纹外地板结构的传递损失评价隔声性能,分析了波纹板结构、波纹板加上板结构、波纹板加下板结构和波纹板加夹板结构在不同腹板倾角下的隔声性能。计算结果表明:波纹板和波纹板加上板结构在各个角度的隔声量都明显高于其他两种结构;波纹板加下板结构隔声效果最差,波纹板加上板结构隔声效果最好,两者在腹板倾角为55°时隔声量差值为6.9 dB。通过隔声量分析,得出了不同频率噪声下的腹板倾角和结构的最佳组合,为高速列车波纹外地板低噪声结构设计提供依据。
Based on the mixed finite element method, the statistical energy method and the periodic substructure theory, the acoustic model of the corrugated outer floor of the high-speed train was established. According to the transmission loss of the corrugated outer floor structure, the sound insulation performance was evaluated. The corrugated plate structure, Structure, the corrugated plate plus the plate structure and the corrugated plate plus the splint structure under different web inclinations sound insulation performance. The calculation results show that the sound insulation of the corrugated board and the corrugated board plus the board structure is obviously higher than that of the other two structures at all angles. The corrugated board plus the underplate structure has the worst sound insulation effect, and the corrugated board plus the noise effect of the board structure is the most Good, the difference between the sound insulation of the two when the web inclination is 55 ° is 6.9 dB. Through the analysis of sound insulation quantity, the best combination of web inclination angle and structure under different frequency noise is obtained, which provides the basis for low noise structure design of high speed train corrugated floor.