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首页> 外文期刊>Journal of the American Helicopter Society >Stochastic Aeroelastic Analysis of Composite Helicopter Rotor
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Stochastic Aeroelastic Analysis of Composite Helicopter Rotor

机译：复合直升机旋翼的随机气动弹性分析

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摘要

The effect of uncertainty in composite material properties on the aeroelastic response, vibratory loads, and stability of a hingeless helicopter rotor is investigated. The uncertainty impact on rotating natural frequencies of the blade is studied with Monte Carlo simulations and first-order reliability methods. The stochastic aeroelastic analyses in hover and forward flight are carried out with Monte Carlo simulations. The flap, lag, and torsion responses show considerable scatter from their baseline values, and the uncertainty impact varies with the azimuth angle. Furthermore, the blade response shows finite probability of resonance-type conditions caused by modal frequencies approaching multiples of the rotor speed. The 4/rev vibratory forces show large deviations from their baseline values. The lag mode damping shows considerable scatter due to uncertain material properties with an almost 40% probability of instability in hover.
机译：研究了复合材料性能不确定性对无铰链直升机旋翼的气动弹性响应，振动载荷和稳定性的影响。利用蒙特卡洛模拟和一阶可靠性方法研究了不确定性对叶片旋转固有频率的影响。悬停和向前飞行中的随机气动弹性分析是通过蒙特卡洛模拟进行的。襟翼，滞后和扭转响应从其基线值显示出很大的分散性，不确定性影响随方位角而变化。此外，叶片响应显示出由模态频率接近转子速度的倍数引起的共振类型条件的有限概率。 4 / rev振动力显示出与其基线值的较大偏差。由于不确定的材料特性，滞后模式阻尼显示出很大的分散性，悬停时几乎有40％的不稳定性。

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