A review of numerical virtual flight studies for aerodynamic, motion and control coupling in complex flight conditions
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摘要:
数值虚拟飞行(NVF)技术能够高保真地模拟复杂飞行环境下飞行器的动态响应特性,是飞行器控制律设计与飞行品质评估的关键技术。系统综述了气动、运动和控制耦合的NVF技术,重点讨论了该耦合方法在复杂飞行问题中的应用。梳理了NVF的基本框架与技术流程,重点阐述了动网格技术从单一变形向动态混合网格体系的演进历程,及其在保障部件相对运动与计算稳定性中的关键作用,并指出机器学习在网格质量控制中的赋能潜力。针对非定常流场求解,探讨了气动、运动与控制的耦合方式,介绍了从松耦合到紧耦合闭环求解的技术演变,指出紧耦合方法可显著提升对大迎角、过失速等高动态飞行的仿真精度。详细阐述了该耦合方法在高超声速多场耦合、变构飞行、柔性仿生等三大场景中的应用实践。面向未来,在人工智能技术的赋能中,NVF将进一步向高效统一、全系统多场耦合的方向发展,加速飞行器的研制模式向“仿真驱动、数智试验”转型。
Abstract:High-fidelity simulation of an aircraft’s dynamic reaction characteristics under challenging flight conditions is made possible by numerical virtual flight (NVF) technology, which is essential for designing control laws and assessing flight quality. This paper systematically reviews the NVF technology coupled with aerodynamics, motion, and control, with an emphasis on the application of this coupling method in complex flight problems. This paper outlines the basic framework and technical workflow of NVF, elaborating on the evolution of dynamic mesh technology from single deformation to dynamic hybrid mesh systems, as well as its critical role in ensuring relative motion of components and computational stability, while also pointing out the enabling potential of machine learning in mesh quality control. Regarding unsteady flow field solutions, this paper discusses the coupling modes of aerodynamics, motion, and control, introduces the technical evolution from loose coupling to tightly coupled closed-loop solutions, and highlights that the tightly coupled method can significantly improve the simulation accuracy for high-dynamic flight states such as high angle of attack and post-stall. This paper elaborates on the application practices of this coupling method in three major scenarios: hypersonic multi-field coupling, morphing flight, and flexible bionics. NVF will advance toward effective, unified, and full-system multi-field coupling in the future thanks to artificial intelligence technologies, hastening the shift in aircraft development paradigms toward simulation-driven, digital-intelligent testing.
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Key words:
- complex flight /
- multi-body separation /
- flexible morphing /
- multi-physics coupling /
- unsteady flow
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表 1 不同飞行试验与NVF方法的应用与局限对比
Table 1. Comparison of applications and limitations between different flight tests and NVF methods
方法 应用 局限 风洞试验[1,9-10] 用于获取典型构型在不同来流工况下的流场结构与气动特性,为气动机理分析和模型验证提供试验依据 工况覆盖有限,难以同时复现高马赫数、大雷诺数、气动力热耦合等极端飞行状态,多体分离与构型快速变化模拟能力受限 虚拟飞行试验[1,7,11] 在地面风洞试验环境中引入多自由度模型运动控制能力,用于动态响应和控制系统鲁棒性验证 受风洞试验条件限制,对强非线性气动/运动耦合效应、高超声速力热耦合效应复现能力不足,飞行工况全包线覆盖能力不足 数值虚拟飞行-离线耦合阶段[2-4,10] 基于CFD仿真结果构建气动数据库或代理模型,为飞行仿真提供气动输入 气动、运动与控制数据无法实时反馈,对强非线性、迟滞效应及极端机动场景预测能力有限 数值虚拟飞行-紧耦合阶段[12-16] 在统一时域内耦合气动、运动与控制系统求解,可用于复杂机动、变构飞行及多场耦合问题的仿真与验证 计算成本高,对动网格质量、时间推进精度与耦合算法稳定性要求严格,工程化应用仍依赖高性能计算支撑 表 2 NVF中动网格技术的发展历程与演进方向
Table 2. Development history and evolutionary direction of dynamic mesh technology in NVF
时间历程 处理方式 代表方法 20世纪90年代 刚性运动与接口处理 刚性运动网格,滑移网格,多参考系,多块结构网格接口处理 21世纪初期 连续网格变形方法 代数插值类(超限插值、反距离加权),物理类(弹簧法,线性弹性体法,拉普拉斯光顺法),
全局插值类(径向基函数、 Delaunay图映射位移传播)21世纪中后期 重叠/嵌套网格体系 重叠网格,嵌套网格,孔洞切割,供体搜索,守恒插值;
背景网格与浸入边界法(笛卡儿网格、切割单元、浸入边界法、自适应网格加密)21世纪10年代 动态混合网格(工程主流) 变形+局部重构,Delaunay映射,局部拓扑操作(翻转/分裂/合并)
近壁面网格质量控制(边界层层状网格保持、各向异性网格保持,网格质量监测与重构触发)2018年-至今 智能化与多物理场一致网格 智能方法(机器学习网格质量评估、图神经网络网格判别、强化学习驱动自适应网格);
多物理场自适应(h/r/p自适应、流-固-热耦合一致更新、柔性变构型与仿生系统)表 3 传统动网格方法与机器学习方法在网格更新中的对比
Table 3. Comparison of traditional dynamic mesh methods and machine learning methods in mesh updates
要素 传统动网格方法 基于机器学习的方法 方法 根据几何关系和物理模型直接计算网格运动 通过已有数据学习网格变化或质量特征 作用对象 网格节点位移、单元变形和局部重构 网格质量、变形趋势或更新策略 稳定性与守恒性 可以明确控制,结果可预测 本身不保证,需要额外约束 应对大变形和多体运动 通过混合变形、重构或重叠网格实现 通过模式识别给出辅助判断 对新工况的适应性 规则固定,但行为稳定 依赖训练数据,需重新训练 当前应用情况 已用于工程问题 NVF 仿真 主要用于标模算例验证 -
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