宽带水载多相五模元结构,具有同时波面操纵和能量吸收能力
Yi An1, Han Zou2, Aiguo Zhao2
1School of Physical and Mathematical Science, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel, Switzerland)
|July 29, 2023
概括
这项研究介绍了一种用于水下隐形的新型复合声学元结构. 先进的设计增强了声音吸收和波面操纵,大大减少了声学特征.
科学领域:
- 声学元材料是一种声学元材料.
- 水下声学 水下声学
- 隐形技术是一种隐形技术.
背景情况:
- 声学元结构在子波长尺度上操纵声波.
- 以前的设计主要使用单一的材料,限制了性能.
- 水下声学隐形需要波面操纵和声音吸收.
研究的目的:
- 提出和分析一个复合声学元结构,以提高水下声学隐形.
- 为了研究波面操纵和声音吸收的联合效应.
- 为了评估与单相元结构相比的性能.
主要方法:
- 设计一个由金属格子,聚合物材料和质量平衡柱组成的单元电池.
- 沿着元结构的水平方向逐渐调节等效的物理性质.
- 利用聚合物材料固有的阻尼性能来消耗能量.
主要成果:
- 复合元结构实现了反射波方向和散射声波幅的同时调制.
- 观察到水下隐形效应的显著改善.
- 与单相设计相比,远场声压水平 (FFSPL) 降低了4.82dB (3kHz30kHz).
- 在液压压力下,线性平均应力减少到单相元结构的1/3.
结论:
- 拟议的复合声学元结构提供了卓越的水下隐形性能.
- 该结构表现出减少的应力和在压力下均的分布.
- 它的可接受厚度 (80毫米) 和低密度 (1100公斤/立方米) 表示其实际应用潜力.
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