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The effect of laminate lay-up on the flutter speed of composite wings.

机译:层压板叠层对复合材料机翼颤动速度的影响。

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摘要

This paper presents an analytical study on optimization of a laminated compositewing structure for achieving a maximum flutter speed and a minimum weightwithout strength penalty. The investigation is carried out within the range ofincompressible airflow and subsonic speed. In the first stage of theoptimization, attention has been paid mainly to the effect on flutter speed ofthe bending, torsion and, more importantly, the bending-torsional couplingrigidity, which is usually associated with asymmetric laminate lay-up. The studyhas shown that the torsional rigidity plays a dominant role, while the couplingrigidity has also quite a significant effect on the flutter speed. In the secondstage of the optimization, attention has been paid to the weight and laminatestrength of the wing structure, which is affected by the variation in laminatelay-up in the first stage. Results from a thin-walled wing box made of laminatedcomposite material show that up to 18 per cent increase in flutter speed and 13per cent reduction in weight can be achieved without compromising the strength.The investigation has shown that a careful choice of initial lay-up and designvariables leads to a desirable bending, torsional and coupling rigidities, withthe provision of an efficient approach when achieving a maximum flutter speedwith a minimum mass of a composite wing.
机译:本文提出了一种优化的层压复合机翼结构的分析研究,以实现最大的振颤速度和最小的重量而不会造成强度损失。研究是在不可压缩的气流和亚音速范围内进行的。在优化的第一阶段,主要关注弯曲,扭转对振摆速度的影响,更重要的是,弯曲扭转耦合刚度通常与不对称的层压板叠合有关。研究表明,扭转刚度起主要作用,而耦合刚度对振颤速度也有很大影响。在优化的第二阶段,机翼结构的重量和层压强度受到关注,这受到第一阶段层压结构变化的影响。由层压复合材料制成的薄壁机翼盒的结果表明,在不影响强度的前提下,振颤速度可提高18%,重量减轻13%。研究表明,精心选择初始铺层设计变量会导致理想的弯曲,扭转和耦合刚度,并在以最小的复合机翼质量实现最大扑动速度时提供一种有效的方法。

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