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Dynamic Modulus of Elasticity of Concrete

Dynamic Modulus of Elasticity of Concrete

The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...

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具有弹性体增强辅助性结构的二维冲击阻尼静电执行器.

Xuechuan Wang¹, Yongyue Wang², Mingzhu Zhu²

¹School of Astronautics, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China. xcwang@nwpu.edu.cn.

Nature communications

|August 26, 2024

概括

研究人员开发了新的辅助电静电执行器,模仿肌肉功能,为仿生机器人提供增强的冲击阻尼和冲击吸收. 这些执行器在现实应用中提供肌肉般的性能和稳定性.

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科学领域:

机器人和材料科学机器人和材料科学
生物仿真工程生物仿真工程

背景情况:

仿生机器人需要合规的执行器,可以复制生物肌肉功能.
当前的静电执行器提供快速响应和效率,但缺乏冲击阻尼,限制了它们的现实世界的稳定性.

研究的目的:

为仿生机器人开发具有改进冲击阻尼和肌肉类性能的静电执行器.
解决动态环境中的传统静电执行器的脆弱性和不稳定性.

主要方法:

利用弹性体增强辅助剂和静电拉链机制来创建新的执行器.
研究了应电压时的线性收缩,执行强度和收缩比.
评估了振动减弱和冲击能量吸收能力.

主要成果:

实现了很大的驱动强度 (15N) 和高收缩率 (59%).
证明了冲击引起的振动 (0.3秒) 的快速减弱和有效的冲击能量吸收.
由易于获得的材料制造的原型表现出类似肌肉的性能.

结论:

辅助式静电驱动器为仿生机器人中的合规驱动提供了一个有前途的解决方案.
开发的执行器在需要冲击阻尼和可调节刚度的应用中具有很大的潜力,例如机器人手臂和延伸度装置.