NN-MMFNet:面向纯电动车结构路噪预测的因果与非负注意力网络
Causality- and Passivity-Constrained Nonnegative Attention for Interpretable Structure-Borne Road Noise Prediction in Battery Electric Vehicles
论文提出物理信息驱动的非负多模态融合网络 NN-MMFNet,从多点底盘激励预测纯电动车车内声压,用于 20 Hz 至 300 Hz 结构路噪。模型用双流编码器分离瞬态冲击与稳态共振,融合解码路径严格因果,并施加无源性谱增益上限、将跨模态注意力权重约束为非负以实现可加路径归因。
来源:Archives of Acoustics RSS · CC BY 4.0 · Haijun Wang, Zhijie Huang, Zengjun Lu, Xianghua He, Tie Xu · 原文 · 许可条款
作者
摘要
在纯电动汽车(BEV)中,由于发动机掩蔽成分基本缺失,20 Hz 至 300 Hz 频段的结构传播路噪变得更加明显,而传统的传递路径公式可能对悬架非线性和病态求逆较为敏感。本文提出了一种物理信息驱动的非负多模态融合网络(NN-MMFNet),可从多点底盘激励预测车内声压,同时保持映射的物理合理性和可解释性。该模型结合了双流编码器,将瞬态冲击特征与稳态共振内容分离,并采用严格
因果融合/解码路径。应用了基于无源性的频谱增益上限,以防止非物理放大,同时保留相位。为实现可加性的路径归因,跨模态注意力权重被约束为非负。训练遵循仿真到真实的工作流程,使用虚拟车队预训练并在实测数据上进行短时微调。在一辆量产 BEV 上,NN-MMFNet 在 60 km/h 下以 1.12 dB(A) 的全局均方根误差(RMSE)重现了 20 Hz 至 300 Hz 频谱,在 128 Hz 轰鸣处误差为 0.14 dB,优于传递路径分析(TPA)、频率传递矩阵(FTM)和自回归滑动平均(ARMA)基线。脉冲响应检查显示无源性违规率可忽略不计(<0.01 %)。学习到的注意力一致指向 128 Hz 附近的后副车架到车身安装路径,对该位置进行有针对性的刚度调整后,实测车内噪声降低了 4.2 dB(A)。
关键词:
结构传播路噪, 物理信息神经网络(PINN), 传递路径分析(TPA), 跨模态注意力, 纯电动汽车(BEV)
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