在高度减弱的多孔材料中改进声波传播模型
A Bouchendouka1, Z E A Fellah1, C T Nguyen2
1Aix Marseille Univ, CNRS, Centrale Marseille, LMA UMR 7031, Marseille, France.
The Journal of the Acoustical Society of America
|January 5, 2024
概括
一个新的模型改善了高度吸收的多孔材料中的声波预测,这对于在汽车塑料泡等应用中有效降低噪声至关重要. 这种增强的模型准确地捕捉了超声波频率的信号传输和衰减.
科学领域:
- 声学 声学 在声学方面
- 材料科学 材料科学 材料科学
- 波浪传播 波浪传播
背景情况:
- 约翰逊-香-阿拉德模型虽然很常见,但在高频率的高吸收性多孔材料中难以准确预测声波传播.
- 精确的声衰减建模对于开发有效的降噪解决方案至关重要,特别是在使用塑料泡的汽车应用中.
- 现有的模型无法在空中超声波频率范围 (30200 kHz) 中重建具有显著波衰减的材料中传输的声信号.
研究的目的:
- 提出一种改进和扩展的模拟方法,用于在刚性多孔材料中的声波传播.
- 解决经典模型在准确描述高吸收介质中的波衰减方面的局限性.
- 为了更全面地描述可用于先进降噪应用的多孔材料.
主要方法:
- 引入了新的非声学参数 (Σ,V用于粘性效应; Σ',V'用于热效应),具有表面和体积维度.
- 将这些参数纳入了动态扭曲度α') 和热扭曲度α') 响应函数在皮肤深度上的扩展.
- 验证了模型重建传输声信号和模型明显声衰减的能力.
主要成果:
- 这种新的建模方法成功地重建了传输的声信号,超越了经典模型的性能.
- 在高度减弱的多孔材料中实现了明显的声衰减的准确建模.
- 扩展模型提供了对流体-固体相互作用 (惯性-粘性和热性) 的更全面的理解.
结论:
- 改进的模型准确地描述了超声波频率在高度吸收的多孔材料中的声波传播和衰减.
- 这种方法提高了对复杂的多孔介质进行表征的能力,这对于有效的降噪技术至关重要.
- 这项研究为材料表征开辟了新的途径,超出了当前声学模型的范围.
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