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A numerical analysis of carbon nanotube-based damping in rotating composite structures

机译：旋转复合结构中基于碳纳米管的阻尼的数值分析

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摘要

Composite structures often exhibit vibrations due to their high specific stiffness, and suppressing these vibrations is critical to increasing the efficiency and performance of the overall system. Previous studies have shown that matrix-embedded carbon nanotubes (CNTs) have the potential to provide a significant increase in the damping characteristics of the final composite, augmenting the materials ability to passively reduce vibrations within the structure. This work investigates the effect of matrix-embedded CNTs on the dynamic response of rotating composite structures using numerical simulations. Empirical damping functions obtained from experimental results describing the loss factor of fiber-reinforced composites with matrix-embedded CNTs are applied to describe the material damping as a function of CNT weight percentage loading and material strain. The numerical simulations explore three different rotating composite structures of increasing complexity: a simple rectangular beam, a helicopter rotor, and a wind turbine blade. The finite element method is applied to solve these transient simulation cases, and the effects of CNT damping, angular speed, and geometric variation on the dynamic response of the different composite structures are explored.
机译：复合结构通常因其较高的比刚度而表现出振动，因此抑制这些振动对于提高整个系统的效率和性能至关重要。先前的研究表明，嵌入基质的碳纳米管（CNT）可以显着提高最终复合材料的阻尼特性，从而增强了材料被动降低结构内振动的能力。这项工作使用数值模拟研究了嵌入基质的CNT对旋转复合结构动力响应的影响。从实验结果获得的经验阻尼函数描述了基体嵌入的CNTs的纤维增强复合材料的损耗因子，该经验阻尼函数用于描述材料阻尼与CNT重量百分比载荷和材料应变的关系。数值模拟研究了三种不同的旋转复合结构，它们的复杂性不断增加：简单的矩形梁，直升机旋翼和风力涡轮机叶片。应用有限元方法解决了这些瞬态仿真情况，并探讨了碳纳米管阻尼，角速度和几何变化对不同复合结构动力响应的影响。

著录项

  • 来源
    《Composite Structures》 |2013年第9期|18-26|共9页
  • 作者

    C. DeValve; R. Pitchumani;

  • 作者单位

    Advanced Materials and Technologies Laboratory, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238, United States;

    Advanced Materials and Technologies Laboratory, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbon nanotubes; Finite element analysis; Material damping; Rotating structures; Vibrations;

    机译：碳纳米管;有限元分析;材料阻尼;旋转结构;振动;

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