| 祁武超,赵传旭,王猛,田素梅,赵维涛.基于弯扭组合梁元的多段折叠翼离散突风响应[J].计算力学学报,2023,40(5):821~828 |
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| 基于弯扭组合梁元的多段折叠翼离散突风响应 |
| Discrete gust responses of a multi-segment folding wing based on a bending-torsional beam element |
| 投稿时间：2022-04-24 修订日期：2022-09-01 |
| DOI：10.7511/jslx20220424006 |
| 中文关键词: 弯扭组合梁元 多段折叠翼 离散突风 片条理论 |
| 英文关键词:bending-torsional beam element multi-segment folding wing discrete gust the strip theory |
| 基金项目:辽宁省自然科学基金(2019-ZD1-0228);辽宁省教育厅系列项目(JYT2020029;JYT2020034)资助. |
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| 中文摘要: |
| 基于弯扭组合梁元对大展弦比多段折叠翼的离散突风响应特性进行了研究。首先,将平面一般梁元叠加扭转自由度得到一种新的弯扭组合梁元,建立包含折叠角参数的缩减有限元模型。其次,对片条理论进行修正以得到不同折叠角度下弯扭组合梁元上的气动力,构建多段折叠翼在离散突风作用下的动力学方程。最后,引入Laplace变换处理动力学方程中的积分微分项,得到折叠角对翼尖加速度、翼根弯/扭矩等响应的影响。一个近地面无人机三段式折叠翼的算例结果表明,机翼固有频率会随着折叠角的变化呈现非线性性态,相比舒展状态,折叠角的存在虽不能明显减小翼尖加速度,但能够有效减小翼根弯/扭矩响应。 |
| 英文摘要: |
| Discrete gust responses of a high-aspect-ratio multi-segment folding wing are studied based on a bending-torsional beam element model.First,a new bending-torsional beam element is obtained by superimposing the plane general beam element with torsional degree of freedom.Then a reduced finite element model including folding angle parameters is established.Secondly,the aerodynamic forces on the bending-torsional beam elements under different folding angles are obtained by the modified strip theory.Thus the dynamic equations of the multi-segment folding wing under a discrete gust are constructed.Finally,Laplace Transform is introduced to deal with the integral-differential terms in the dynamic equations.Then the effects of folding angles on accelerations of the wingtip and bending moments/torques at the wing root are investigated.Numerical results of a three-segment folding wing of a near-ground UAV show that the natural frequencies of the wing show nonlinear behaviors with the change of folding angles.Compared with the extended state,the existence of folding angles can’t significantly reduce the accelerations of the wingtip,but can effectively reduce the bending moments/torques at the wing root. |
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