通过撞击方式测量模式颗粒密度的实验测量
Sydney A Blue1, Salem C Wright2, Eli T Owens1
1Physics Department, <a href="https://ror.org/01s9sxm36">Presbyterian College</a>, Clinton, 29325 South Carolina, USA.
Physical review. E
|August 20, 2024
概括
研究人员开发了一种简单的声学方法来测量颗粒材料中模式的颗粒密度. 这种技术揭示了低频模式,与干扰过渡理论相一致,并且随着施加的压力而变化.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 软物质物理学 软物质物理学
背景情况:
- 颗粒状材料表现出一种干扰过渡,其特点是过多的低频振动模式.
- 模式的颗粒密度 (GDoM) 是理解颗粒物质行为的一个关键指标,类似于其他物理系统中的状态密度.
- 之前的研究已经通过实验和数值研究了GDoM,通常需要复杂的设置.
研究的目的:
- 介绍一种新的,实验性简单的声学方法来测量模式的颗粒密度.
- 研究不同颗粒系统中施加压力对GDoM的影响.
- 为了验证声学方法与颗粒状材料的既定发现.
主要方法:
- 开发了一种声学技术,使用单个冲击事件在3D颗粒材料中激发振动模式.
- 测试了三种系统:单分散式6mm珠子,单分散式8mm珠子和双分散式混合物.
- 使用嵌入式压电传感器测量粒子反应,并从速度自相关谱计算GDoM.
主要成果:
- 在低施加压力下观察到低频模式的过量,与干扰过渡现象一致.
- 在GDoM中确定了明显的低频峰,这些峰会表现出压力依赖的变化.
- 声学方法在不同的颗粒状结构中被证明有效.
结论:
- 拟议的声学方法提供了一种可访问和简单的方法来测量模式的颗粒密度.
- 结果证实了与干扰相关的低频模式的存在及其压力灵敏度.
- 这种技术有可能提高颗粒材料研究中GDoM测量的频率和可访问性.
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