地铁列车地板铝型材结构参数的轻量化隔声特性影响研究
李拥军林维仁
Study on Lightweight and Sound Insulation Characteristics of Aluminum Profile Structure Parameters for Metro Train Floors
LI YongjunLIN Weiren
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作者信息:中车南京浦镇车辆有限公司， 210031， 南京
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Affiliation:CRRC Nanjing Puzhen Co., Ltd., 210031, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.05.020
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中图分类号/CLCN:U270.2
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栏目/Col:研究报告
摘要:
［目的］轻量化和低噪声是当前轨道交通的发展趋势，实现地铁列车地板型材结构的轻量化低噪声设计对提高乘车舒适性具有重要意义。［方法］基于FE-SEA（有限元-统计能量分析）混合法建立地铁列车地板铝型材结构隔声特性预测模型，将仿真与测试结果进行对比验证模型有效性，分析地板铝型材结构的筋板角度、筋板厚度、上下板厚度4个参数对其隔声特性的影响，并以质量定律的轻量化原则为判定标准对4个结构参数进行选择，确定优化结构，最终实现地板铝型材结构的轻量化声学优化。［结果及结论］结果表明，在所列举的铝型材结构参数优化结构中，选择筋板角度为47°、筋板厚度为2.0 mm、上板厚度为2.7 mm、下板厚度为2.7 mm时，单位面积结构质量减小1.18 kg/m2，整节车厢地板质量可减小约70.8 kg，而计权隔声量仅减小0.3 dB，其轻量化声学优化效果更好。可为地铁列车地板铝型材结构的轻量化降噪优化设计提供参考。
Abstracts:
［Objective］ Developing lightweight and low noise is a current trend in rail transit. Achieving lightweight and low-noise design of metro train floor profiles is of significant importance for improving passenger comfort. ［Method］ A prediction model for the sound insulation characteristics of metro train floor aluminum profile structures is established based on FE-SEA (finite element-statistical energy analysis). Simulation results are compared with test results to verify the validity of the model. The influence of four parameters of the floor aluminum profile structure—rib angle, rib thickness, upper plate thickness, and lower plate thickness—on its sound insulation characteristics of aluminum is analyzed. The lightweight principle of the mass law is used as the criterion to determine the optimal structure by selecting the four structural parameters, ultimately achieving the lightweight and acoustically optimized floor aluminum profile structure. ［Result & Conclusion］ The results indicate that among the listed optimized aluminum profile structure parameters, selecting a rib angle of 47°, rib thickness of 2 mm, upper plate thickness of 2.7 mm, and lower plate thickness of 2.7 mm can reduce the structural mass by 1.18 kg/m2. The mass of the entire compartment floor can be reduced by approximately 70.8 kg, while the weighted sound insulation only decreases by 0.3 dB, which demonstrates a better lightweight and acoustically optimized effect. Reference is provided for the lightweight and noise reduction optimization design of aluminum profile structures for metro train floor.
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