增加质量的负波桑比率元材料的增强宽带低频性能
Yuxin Liu1, Shuihai Dou2, Yanping Du1
1School of Mechanical and Electrical Engineering, Beijing Institute of Graphic Communication, Beijing, 102600, China.
Scientific reports
|April 22, 2025
概括
我们开发了一种新的负面Poisson.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 物理 物理学 物理
背景情况:
- 超材料提供了天然材料中无法找到的独特特性.
- 负波桑比率 (NPR) 的超材料表现出辅助性行为.
- 控制振动和吸收能量是关键的工程挑战.
研究的目的:
- 设计和研究一个负波桑比率的附加质量 (NPM) 的元材料.
- 探索增加质量的对带隙特性和振动减振的影响.
- 评估NPM和梯度结构的能量吸收能力.
主要方法:
- 计算模拟用于预测带隙形成.
- 振动传输光谱的实验测量.
- 准静态压缩试验,以评估能量吸收.
主要成果:
- 增加的质量成功地产生了新的,更宽的,更低频带间隙.
- 实验振动数据证实了预测的带隙和振动减少.
- NPM单元的梯度布局显著改善了振动隔离和能量吸收.
结论:
- 对于降低低频振动来说,NPM是有效的.
- 梯度结构可以提高NPM的多功能性能.
- 这项工作开创了集成超材料的先驱,用于组合振动隔离和能量吸收.
相关概念视频
01:23Poisson's Ratio
326
Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
326
01:23Parallel Resonance
173
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
173