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Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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界面道效应用于高效的声学脱冰设计.

Yiwei Hao1, Songquan Yi2, Tao Zhou2

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一种新的声学脱冰方法使用接口道效应来有效地去除冰. 这种技术将声能集中在冰面上,提高了航空业的脱冰性能.

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科学领域:

  • 声学工程 声学工程
  • 材料科学 材料科学 材料科学
  • 航空航天工程 航空航天工程

背景情况:

  • 声学脱冰为航空业提供了高能效.
  • 目前的研究缺乏对声学脱冰机制的深入理解.
  • 现有的研究重点是宏观性能,而不是基本原则.

研究的目的:

  • 提出和验证一种新的声学除冰概念:接口道效应.
  • 阐明声学脱冰的基本机制.
  • 为高效的声学脱冰技术提供设计指南.

主要方法:

  • 在现场实验性研究界面道效应.
  • 有限元模拟用于模拟声学脱冰.
  • 对声波传播的分析 (表面与板块波).
  • 声学/机械合场的研究.

主要成果:

  • 界面道效应将声能集中在冰/固体界面上.
  • 混合声波有效地维持了除冰的接口道.
  • 表面波迅速减弱;板状波具有较低的界面强度.
  • 外部剪切力增强了界面道的传播.

结论:

  • 接口道效应是有效的声学降冰的可行机制.
  • 混合声波对于持续的界面能量传递至关重要.
  • 了解波浪传播和外部力量是优化脱冰的关键.
  • 这项研究为先进的声学脱冰系统奠定了基础.