适用于弹性飞机飞行动力学仿真的气动力降阶方法

师妍; 万志强; 吴志刚; 巩轶男

doi:10.13700/j.bh.1001-5965.2021.0510

适用于弹性飞机飞行动力学仿真的气动力降阶方法

doi: 10.13700/j.bh.1001-5965.2021.0510

1.
北京航空航天大学航空科学与工程学院，北京 100191
2.
海鹰航空通用装备有限责任公司，北京 100070

详细信息

通讯作者:
E-mail：wuzhigang@buaa.edu.cn

中图分类号: V212.1；V211；V215.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-02
- 录用日期: 2021-11-22
- 网络出版日期: 2021-12-30
- 整期出版日期: 2023-07-31

Aerodynamic order reduction method for elastic aircraft flight dynamics simulation

1.
School of Aeronautic Science and Engineering，Beihang University，Beijing 100191，China
2.
Seahawk Aviation General Equipment Co.，Ltd.，Beijing 100070，China

More Information

Corresponding author: E-mail：wuzhigang@buaa.edu.cn

摘要

摘要:
针对低速太阳能无人机在由阵风引起的大迎角非线性气动力情况下的高精度、高效率气动弹性及飞行动力学工程仿真问题，对气动力降阶方法及其在飞行动力学仿真中的应用进行深入探索。以二维翼型为例，分别基于自回归外部输入模型(ARX)方法、多小波Volterra级数方法、反向传播(BP)、径向基函数(RBF)神经网络方法和支持向量回归(SVR)方法建立了非定常气动力降阶模型，并比较了5种方法的收敛性及泛化能力。在此基础之上综合ARX和神经网络方法的优点提出一种计算精度高，收敛性、泛化能力较强的ARX-BP/RBF组合建模方法。将基于ARX-RBF的组合气动力降阶方法和弹性飞机刚弹耦合动力学方程相结合建立基于气动力降阶的弹性飞机飞行动力学仿真模型。以一架太阳能无人机模型为例，开展数值验证，对算例对象在阵风及舵面激励下的响应进行仿真研究，并和计算流体力学(CFD)-计算结构动力学(CSD)结果及基于线性气动力的仿真结果进行对比。结果表明：所建立的弹性飞机仿真模型能有效反映气动力非线性特性，且仿真效率高于CFD-CSD分析方法，适用于工程实践。
- 气动力降阶 /
- 飞行仿真 /
- 刚弹耦合动力学方程 /
- 太阳能无人机 /
- 阵风响应
Abstract:
We develop an aeroelasticity and flight dynamics simulation model with nonlinear aerodynamic reduced order model for low-speed solar unmanned aerial vehicles under high angle of attack caused by gust. Five aerodynamic reduced-order models are created in light of the aforementioned issues, and their use in simulating flight dynamics is further explored. The reduced order models include the model based on the autoregressive model with eXogenous inputs (ARX) method, multi-wavelet Volterra series method, back propagation (BP) neural network, radial basis function (RBF) neural network and support vector regression. Then the convergence and the generalization ability of the five models are compared, and a new model with high precision and strong generalization ability is proposed, which is a combination of ARX and neural network model. Taking a solar UAV model as an example, combining an aerodynamic reduced order model with a rigid-elastic coupling dynamic equation, the flight dynamics simulation model of elastic aircraft is established. Lastly, the computational fluid dynamics-computational structural dynamics (CFD-CSD) outputs and the outcomes of the simulation model based on linear aerodynamics are compared with the simulation results to determine how the UAV model responds to gusts. The results show that the performance of the elastic aircraft simulation model in aerodynamic prediction and gust response analysis is better than that of the model based on linear aerodynamics and is in good agreement with the CFD-CSD model, and the simulation efficiency is much higher than that of the CFD-CSD analysis.
- aerodynamic reduced order model /
- flight simulation /
- rigid elastic coupling dynamic equation /
- solar unmanned aerial vehicle /
- gust response

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图 1 弹性飞机飞行动力学仿真框架

Figure 1. Flight dynamics simulation framework

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图 2 气动力计算模块

Figure 2. Aerodynamic calculation framework

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图 3 SVR原理示意图

Figure 3. Schematic diagram of SVR

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图 4 CFD计算结果和实验结果^[20]对比

Figure 4. Comparison of CFD and experimental results^[20]

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图 5 训练集和测试集部分信号形式

Figure 5. Partial signal form of training and test set

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图 6 各模型在测试集上的输出结果和CFD计算结果对比

Figure 6. Comparison between output results of different reduced order models and CFD methods ontest data set

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图 7 各模型随训练速度点样本数增加收敛性对比

Figure 7. Comparison of convergence of each model with increasing sample size of training speed points

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图 8 各模型对来流速度泛化能力对比

Figure 8. Comparison of generalization ability of each model for incoming flow velocity

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图 9 ARX-BP/RBF组合模型结构

Figure 9. Structure of ARX-BP/RBF combined model

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图 10 组合模型和原始模型收敛性对比

Figure 10. Comparison of convergence between combined model and original model

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图 11 组合模型和原始模型泛化能力对比

Figure 11. Comparison of generalization ability of combined model and original model

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图 12 太阳能无人机结构模型

Figure 12. Structural model of solar UAV

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图 13 弹性模态振型

Figure 13. Elastic mode shape

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图 14 整机外表面网格及局部放大

Figure 14. Grid of external surface and local enlarged view of UAV

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图 15 气动片条划分俯视图

Figure 15. Top view of slice model

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图 16 三维气动力降阶模型运行流程

Figure 16. Operation process of three dimensional aerodynamic reduced order model

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图 17 CFD计算结果的给定运动及变形信号

Figure 17. Motion and deformation signal for CFD calculation

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图 18 初始、修正模型输出结果与CFD计算结果对比

Figure 18. Comparison of initial and modified model output results with CFD calculation results

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图 19 飞行仿真模型输出结果与CFD-CSD结果对比

Figure 19. Comparison of flight simulation model output results with CFD-CSD results

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图 20 阵风算例1加速度响应对比

Figure 20. Comparison of acceleration response under gust case 1

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图 21 阵风算例2加速度响应对比

Figure 21. Comparison of acceleration response under gust case 2

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图 22 阵风算例3加速度响应对比

Figure 22. Comparison of acceleration response under gust case 3

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图 23 舵偏角变化曲线

Figure 23. Variation curve of rudder deflection angle

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图 24 给定舵偏角变化后加速度响应对比

Figure 24. Comparison of acceleration response for a given rudder deflection angle change

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表 1 CFD计算验证算例翼型运动参数

Table 1. Airfoil motion parameters of CFD case

翼型弦长/m	来流速度/ (m·s⁻¹)	初始迎角/(°)	俯仰运动幅值/(°)	减缩频率
0.55	40.8	15	10	0.124

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表 2 训练集速度点设置

Table 2. Speed settings for training sets

训练集编号	训练集包含的速度点/(m·s⁻¹)
1	10,60
2	10,35,60
3	10,20,30,40,50,60
4	10,15,20,25,30,35,40,45,50,55,60

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表 3 测试集速度点设置

Table 3. Speed settings for test sets

测试集编号	测试集速度/( m·s⁻¹)
1	55
2	33
3	22
4	12
5	10

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表 4 各模型相同测试集计算时间对比

Table 4. Comparison of calculation efficiency for same test set for each model

模型	计算时间/s
ARX	0.005
Volterra	0.080
BP	0.009
RBF	0.045
SVR	0.052

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表 5 组合模型相同测试集计算时间对比

Table 5. Comparison of calculation efficiency for same test set for each model

模型	计算时间/s
ARX-RBF	0.0505
ARX-BP	0.0120

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表 6 太阳能无人机结构主要参数

Table 6. Main structural parameters of solar UAV

结构参数	数值
机翼展长/m	50.00
机翼弦长/m	1.72
平尾展长/m	10.20
平尾弦长/m	1.52
垂尾展长/m	4.77
垂尾弦长/m	1.52
质量/kg	424.70
质心到机头距离/m	10.87
转动惯量I_xx/(kg·m²)	5.9387×10⁴
转动惯量/I_yy/(kg·m²)	4.8061×10³
转动惯量/I_zz/(kg·m²)	6.4156×10⁴
转动惯量/I_xz/(kg·m²)	0.2516

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表 7 弹性模态频率

Table 7. Elastic modal frequency

阶数	频率/Hz
1	0.48
2	1.33
3	2.01
4	3.36
5	3.55
6	4.74

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表 8 来流及SIN型阵风参数

Table 8. Incoming flow and SIN type gust parameters

来流风速/（m·s⁻¹）	阵风形式	阵风幅值/（m·s⁻¹）	阵风频率/ Hz
20	SIN型	7	1.2

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表 9 计算效率对比

Table 9. Comparison of calculation efficiency

模型	时间步长/s	时间步数	计算时间/min
CFD-CSD	0.001	5000	2398
本文模型	0.001	5000	77

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表 10 来流及1-COS型型阵风参数

Table 10. Incoming flow and 1-COS type gust parameters

编号	来流风速/ （m·s⁻¹）	阵风形式	阵风幅值/ （m·s⁻¹）	尺度L₁/m	尺度L₂/m
1	20	1-COS型	1	30	40
2	20	1-COS型	5	10	40
3	20	1-COS型	7	30	50

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