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A study of the vibration and lay-up optimization of rotating cross-ply laminated nanocomposite blades

机译：旋转交叉层压纳米复合材料叶片的振动和铺放优化研究

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摘要

A comprehensive understanding of the vibration characteristics of rotating blades is critical to avoid resonance fracture. This paper presents the vibration analysis and lay-up optimization of rotating pre-twisted laminated functionally graded CNTs reinforced composite (FG-CNTRC) shallow conical shells. A numerical shallow conical shell model is proposed, and the displacement fields of the shell model are described via the first-order shear deformation theory. Considering the rotating speed, the governing equation of the rotating pre-twisted laminated conical shell is derived, and then solved using the meshless kp-Ritz method. We carry out the comparison studies to demonstrate the accuracy and efficiency of the present model in dealing with the vibrations of this kind of structures. Detailed parametric studies are then performed and demonstrate that the CNT configuration, pre-twisted angle, and stacking sequence play essential roles in vibration behaviors of rotating FG-CNTRC blade. With the nondimensional frequency parameter being the optimization objective function, a genetic algorithm is employed to search for the optimal layering sequence of the rotating shallow conical shells. The optimized results demonstrate that the GA serves as a useful tool for sequence optimization of rotating blade in terms of improving the vibration characteristics.
机译：全面了解旋转叶片的振动特性对于避免共振破裂至关重要。本文介绍了旋转预扭层压功能梯度碳纳米管增强复合材料（FG-CNTRC）浅圆锥壳的振动分析和铺层优化。提出了数值浅锥壳模型，并通过一阶剪切变形理论描述了壳模型的位移场。考虑到旋转速度，推导了旋转的预扭叠层圆锥壳的控制方程，然后用无网格kp-Ritz方法求解。我们进行了比较研究，以证明本模型在处理此类结构振动方面的准确性和效率。然后进行详细的参数研究，并证明CNT的构型，预扭曲角和堆叠顺序在旋转FG-CNTRC叶片的振动行为中起着至关重要的作用。以无量纲频率参数为优化目标函数，采用遗传算法寻找旋转浅锥壳的最佳分层顺序。优化结果表明，GA在改善振动特性方面可作为旋转叶片顺序优化的有用工具。

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  • 来源
    《Composite Structures》 |2020年第3期|111775.1-111775.14|共14页
  • 作者

  • 作者单位

    Shanghai Jiao Tong Univ Dept Engn Mech Sch Naval Architecture Ocean & Civil Engn Shanghai 200240 Peoples R China;

    City Univ Hong Kong Dept Architecture & Civil Engn Kowloon Hong Kong Peoples R China;

    Shanghai Jiao Tong Univ Sch Mech Engn Shanghai 200240 Peoples R China|Minist Educ Engn Res Ctr Gas Turbine & Civil Aero Engine Shanghai Peoples R China;

  • 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

    Free vibration; Rotating pre-twisted blade; FG-CNTRC; Stacking sequence optimization; Genetic algorithm;

    机译：自由振动;旋转预扭曲刀片;FG-CNTRC;堆垛顺序优化;遗传算法;

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