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论文:2015,Vol:33,Issue(4):566-572 |
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引用本文： |
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王伟, 周洲, 祝小平, 段静波, 张驰. 基于CR理论的大柔性太阳能无人机非线性配平及飞行载荷分析[J]. 西北工业大学学报 |
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Wang Wei, Zhou Zhou, Zhu Xiaoping, Duan Jingbo, Zhang Chi. CR Approach of Nonlinear Trim and Flight Load Analysis of Very Flexible Solar Powered UAV[J]. Northwestern polytechnical university |
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| 基于CR理论的大柔性太阳能无人机非线性配平及飞行载荷分析 |
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| 王伟1,2, 周洲1,2, 祝小平2, 段静波1,2,3, 张驰1,2 |
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1. 西北工业大学 航空学院, 陕西 西安 710072;
2. 西北工业大学 无人机特种技术重点实验室, 陕西 西安 710065;
3. 军械工程学院 无人机工程系, 河北 石家庄 050003 |
| 摘要: |
| 大柔性太阳能无人机在气动载荷的作用下产生较大的弹性变形,基于刚性或线弹性假设的结构模型已然不能满足这类飞机配平与飞行载荷分析的精度要求。基于co-rotational(CR)理论建立了大柔性飞机结构模型,并耦合片条气动力模型,提出了一种可以考虑几何非线性效应的大柔性飞机非线性配平及飞行载荷分析的方法。以类"太阳神"布局太阳能无人机为例,采用该方法对其不同有效载荷下的纵向配平及飞行载荷特性进行了较为深入的研究。研究结果表明:有效载荷较大时,采用线弹性假设的结构模型解得的配平误差可达50%以上,对翼尖位移的预测误差可达25%以上;该方法能够较合理地预测大柔性无人机的配平及飞行载荷特性,满足大柔性太阳能无人机结构设计对飞行载荷分析的工程精度要求。 |
| 关键词:
几何非线性
CR理论
大柔性飞机
非线性配平
飞行载荷
太阳能无人机
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| CR Approach of Nonlinear Trim and Flight Load Analysis of Very Flexible Solar Powered UAV |
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| Wang Wei1,2, Zhou Zhou1,2, Zhu Xiaoping2, Duan Jingbo1,2,3, Zhang Chi1,2 |
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1. College of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Science and Technology on UAV Laboratory, Northwestern Polytechnical University, Xi'an 710065, China;
3. Department of UAV, Ordance Engineering College, Shijiazhuang 050003, china |
| Abstract: |
| A very flexible solar powered UAV under aerodynamic load undergoes large deformation; thus it is impossible to obtain its precise nonlinear trimming and flight load characteristics with the structural models that have rigid or linear assumptions. Therefore, combining the co-rotational theory with the aerodynamic strip theory, we develop an analysis algorithm which can deal with the geometrically nonlinear trimming and flight load characteristics of the very flexible solar-powered UAV. Taking a UAV with the layout similar to Helios for example, we explore the nonlinear trimming and flight load characteristics of the UAV under different payloads. The exploration results, given in Fig.5 through 12, and their analysis show preliminarily that: when applying the linear structural model to a large payload region, the trimming error of the UAV reaches 50% and the forecast error of its wingtip displacement reaches 25%. Our analysis algorithm can forecast the reasonable results on the very flexible solar-powered UAV and satisfy the precision requirements for the very flexible solar-powered UAV design in engineering. |
| Key words:
algorithms
angle of attack
control nonlinearities
convergence of numerical methods
design
flow velocity
flowcharting
forecasting
FORTRAN (program language)
geometry
Jacobian matrices
mathematical models
matrix algebra
Newton-Raphson method
schematic diagrams
solar energy
stiffness matrix
unmanned aerial vehicles (UAV)
vectors
co-rotational theory
flight load
nonlinear trimming
very flexible solar-powered UAV
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| 收稿日期: 2015-03-17
修回日期:
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| DOI: |
| 基金项目: 国家自然科学基金(11202162、11302178)与中国博士后基金(2014M560803)资助 |
| 通讯作者: 周洲(1966—),西北工业大学教授、博士生导师,主要从事无人机总体设计研究。
Email： |
| 作者简介: 王伟(1988—),西北工业大学博士研究生,主要从事无人机总体、气动弹性学及飞行力学研究。
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| 王伟 在本刊中的所有文章 |
| 周洲 在本刊中的所有文章 |
| 祝小平 在本刊中的所有文章 |
| 段静波 在本刊中的所有文章 |
| 张驰 在本刊中的所有文章 |
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相关文献: |
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1．王伟, 周洲, 祝小平, 王睿.考虑几何非线性效应的大柔性太阳能无人机静气动弹性分析[J]. 西北工业大学学报, 2014,32(4): 499-504 |
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