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Abstract：
The vibration and radiation noise characteristics of the gear transmission system are different under different traction conditions, and the gear modification optimization scheme based on a single working condition is not suitable for the operating environment under all working conditions. To modify the traction gear of a high-speed EMU, an optimized design scheme for noise reduction under multiple working conditions is proposed. A modification plan of the tooth direction in conjunction with the tooth shape was devised using a parametric model of the EMU\'s traction gear transmission system. The radiation noise of the gear transmission system after modification was solved using the acoustic boundary element method under different working conditions. A gear noise prediction model based on the random forest was proposed, and a gear modification parameter combination was constructed to minimize radiation noise. Then, the optimal design scheme of multi-condition modification combination parameters is obtained with the weight of the running time and acoustic contribution under different working conditions. The grey correlation degree evaluation model is established to verify that the multi-condition modification optimization design method can make the traction gear of EMU obtain satisfactory transmission performance and noise reduction effect under different working conditions.
摘要：
在不同的牵引条件下，齿轮传动系统的振动和辐射噪声特性不同，基于单一工况的齿轮修形优化方案不适合所有工况下的作业环境。要改装高速动车组的牵引齿轮，提出了一种多工况下降噪的优化设计方案。使用动车组牵引齿轮传动系统的参数化模型，设计了齿向与齿形相结合的修正方案。在不同工况下,采用声边界元法求解了改型后齿轮传动系统的辐射噪声。提出了一种基于随机森林的齿轮噪声预测模型,并构造了齿轮修正参数组合，以最大程度地降低辐射噪声。然后，以不同工况下的运行时间和声学贡献为权重,得到了多工况修正组合参数的优化设计方案。建立灰色关联度评价模型,验证了多工况修正优化设计方法能够使动车组牵引齿轮在不同工况下获得满意的传动性能和降噪效果。
