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Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)最新文献

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Characterization of Independent Aerodynamic Effects of Tail-Fin Deflections on an Axisymmetric Body 轴对称体尾翼偏转独立气动效应的表征
C. Mai, D. Dawson, Rajan Kumar, Simon Kirby, T. Birch
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引用次数: 0
Effect of Airfoil-Preserved Undulations on Wing Performance 保留翼型的波动对机翼性能的影响
Faith A. Loughnane, Rachael Supina, Michael P. Mongin, Sidaard Gunasekaran
The effect of undulation placement (leading edge, trailing edge, leading and trailing edge) on the wing performance and the wingtip vortex was investigated. Experiments were performed at the University of Dayton Low Speed Wind Tunnel (UD-LSWT) on undulated wings where the NACA 0012 airfoil crosssection is preserved along the wingspan. Sensitivity studies were done on the undulation wavelength along the span (λ/c 0.31, 0.21 and 0.15) and undulation placement (leading edge, trailing edge, and both leading and trailing edge). The leading edge undulations delayed stall until higher angles of attack, however, the maximum aerodynamic efficiency was reduced. The trailing edge undulated wing on the other hand increased the maximum aerodynamic efficiency but was not successful in stall mitigation. Wings with both leading and trailing edge undulations showed improvement in aerodynamic efficiency as well as delayed stall. The effect of the undulations on the wingtip vortex was also investigated through Particle Image Velocimetry (PIV). For the same coefficient of lift, the undulated wing cases reduced the wingtip vortex circulation by 25%. Investigations into the wingtip vortex core RMS and aerodynamic efficiency revealed a direct relationship where a higher vortex core RMS resulted in a higher aerodynamic efficiency and viceversa. Dedication or Acknowledgements The author acknowledges the partial funding from Henry Luce Foundation through the Clare Boothe Luce Scholars Program for the work presented in this thesis. The author would also like to acknowledge the Ohio Space Grant Consortium (OSGC) for partially funding the primary author for performing undergraduate research. The author would also like to thank UD wind tunnel technician, Jielong Cai, and research partner, Michael Mongin, for helping with manufacturing wind tunnel models and performing experiments.
研究了波动布置(前缘、后缘、前后缘)对机翼性能和翼尖涡的影响。实验在代顿大学低速风洞(UD-LSWT)上进行,其中NACA 0012翼型横截面沿翼展保留。对波动波长沿跨度(λ/c 0.31、0.21和0.15)和波动位置(前缘、后缘以及前后缘都有)进行敏感性研究。前缘波动延迟失速,直到较高的攻角,然而,最大气动效率降低。另一方面,后缘波动翼增加了最大气动效率,但在减缓失速方面并不成功。前缘和后缘都有波动的机翼在气动效率和延迟失速方面都有改善。利用粒子图像测速技术(PIV)研究了波动对翼尖涡的影响。在相同的升力系数下,波纹翼壳使翼尖涡环流减少了25%。对翼尖涡核RMS与气动效率的研究表明,涡核RMS越高气动效率越高,反之亦然。作者感谢亨利·卢斯基金会通过克莱尔·布斯·卢斯学者计划为本文提供的部分资金。作者还想感谢俄亥俄州太空资助联盟(OSGC)为主要作者进行本科研究提供部分资金。作者还要感谢杜克大学风洞技术人员蔡杰龙(Jielong Cai)和研究伙伴迈克尔·蒙金(Michael Mongin)帮助制作风洞模型并进行实验。
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引用次数: 1
Impact-Geometry Maps; Visualization of Kinetic Impact Effectiveness for Asteroid Deflection Missions Impact-Geometry地图;小行星偏转任务的动力学撞击效果可视化
K. Yamaguchi, R. Hayama, Kikuko Miyata, S. Hara
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引用次数: 0
Application of Non-Linear Harmonic and Time Marching techniques to analyze aerodynamics of inlet distortion in a Tail-Cone Thruster Fan stage 应用非线性谐波和时间推进技术分析尾锥推力器风扇级进气道畸变气动特性
Ritangshu Giri, M. Turner, M. Celestina
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引用次数: 0
Mission-Oriented Additive Manufacturing of Modular Mini-UAVs 面向任务的模块化微型无人机增材制造
M. Bronz, E. Tal, F. Favalli, S. Karaman
Recent developments in fast additive manufacturing, such as rapid 3D printing of composite materials, present opportunities for the manufacturing of small unmanned aerial vehicles (UAVs) that are tailor-made for the specific mission needs. This paper presents a novel framework for mission-oriented, modular design and construction of mini-UAVs using additive manufacturing. The outcome is a manufacturing method which is suitable for a parametric design that can be tailored for specific mission requirements, and rapidly constructed using additive manufacturing techniques. We show how additive manufacturing enables an agile design methodology by allowing fast and efficient iteration of prototypes during the design process. The proposed framework is demonstrated by the design of a tail-sitter hybrid VTOL vehicle, for which wing-tip geometry and wing dihedral angle were optimized over several iterations of rapid prototyping. Additionally, we present a flight performance validation of the resulting vehicle design through flight tests in a motion capture facility and outdoors. Finally we show several other vehicle configurations, such as quadrotors and a fixed-wing aircraft, that also take advantage of the proposed design and manufacturing methods.
快速增材制造的最新发展,如复合材料的快速3D打印,为制造针对特定任务需求量身定制的小型无人机(uav)提供了机会。采用增材制造技术,提出了一种面向任务、模块化设计和建造微型无人机的新框架。结果是一种适合于参数化设计的制造方法,可以根据特定的任务要求进行定制,并使用增材制造技术快速构建。我们展示了增材制造如何通过允许在设计过程中快速有效地迭代原型来实现敏捷设计方法。通过对一架尾坐式混合动力垂直起降飞行器的设计验证了所提出的框架,并通过多次快速原型设计优化了翼尖几何形状和机翼二面角。此外,我们通过在运动捕捉设施和户外的飞行测试,提出了最终车辆设计的飞行性能验证。最后,我们展示了其他几种车辆配置,如四旋翼飞机和固定翼飞机,也利用了提出的设计和制造方法。
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引用次数: 6
Overview of a Generalized Numerical Predictor-Corrector Targeting Guidance with Application to Human-Scale Mars Entry, Descent, and Landing 广义数值预测校正瞄准制导在人尺度火星进入、下降和着陆中的应用综述
R. Lugo, R. Powell, A. Dwyer-Cianciolo
Recent advances in planetary entry guidance algorithms are motived by precision landing criteria for human-scale Mars missions and improved in-space computing capabilities. An NPC targeting guidance algorithm, originally developed for the Mars Surveyor Program 2001 Missions, has been modified and extended to permit a fully generalized, flexible, and robust approach to spacecraft aerocapture and EDL guidance design. This paper describes this generalized targeting NPC guidance (NPCG) and how its modifications enable its use in precision targeting for human missions. System modeling, trajectory propagation, and guidance segment definition and design are described. Finally, the NPCG capability and performance is demonstrated using a human-scale Mars entry, descent, and landing mission simulation.
人类火星任务的精确着陆标准和空间计算能力的提高推动了行星进入制导算法的最新进展。一种NPC目标制导算法,最初为火星测量员计划2001任务开发,已经被修改和扩展到允许一种完全通用、灵活和稳健的方法用于航天器空中捕获和EDL制导设计。本文描述了这种广义瞄准NPC制导(NPCG),以及它的修改如何使其能够用于人类任务的精确瞄准。描述了系统建模、弹道传播和制导段的定义与设计。最后,通过人类尺度的火星进入、下降和着陆任务模拟,演示了NPCG的能力和性能。
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引用次数: 11
Supplementing Haptic Feedback Through the Visual Display of Flight Envelope Boundaries 通过飞行包络边界的视觉显示补充触觉反馈
G. D. Rooij, D. V. Baelen, C. Borst, M. V. Paassen, M. Mulder
This paper describes the design and evaluation of a visual display in supplementing haptic feedback on the side stick as a way to communicate flight envelope boundaries to pilots. The design adds indications for the limits in airspeed, load factor, angle of attack and angle of bank to a standard Airbus primary flight display (PFD). The indications not only show the limits of the flight envelope, but also indicate magnitude and direction of the haptic cues. Fifteen professional Airbus pilots and one Airbus sim instructor participated in an experiment in the SIMONA Research Simulator at Delft University of Technology. Several approaches in three different scenarios were flown in alternate law with the old and new PFD, while haptic feedback was always enabled. Objective results do not show clear improvements with the new display, although the time spent outside the flight envelope is slightly reduced. Subjective results indicate a preference, however, for the new display and an increased understanding of the haptic feedback. Further research is recommended to focus on improving the design by removing unused indications and setting up an experiment with a bank scenario that allows the use of operational bank limits rather than artificially reduced limits.
本文描述了一种视觉显示器的设计和评估,以补充侧杆的触觉反馈,作为向飞行员传达飞行包线边界的一种方式。该设计在标准的空中客车主飞行显示器(PFD)上增加了空速、负载系数、迎角和倾斜角的限制指示。这些指示不仅显示了飞行包线的极限,而且还表明了触觉线索的大小和方向。15名空客专业飞行员和1名空客模拟教练员在代尔夫特理工大学的SIMONA研究模拟器中参加了一项实验。三种不同场景的几种方法在新旧PFD的交替规律下飞行,而触觉反馈始终是启用的。虽然在飞行包线外花费的时间略有减少,但客观结果并没有显示出新的显示器的明显改善。然而,主观结果表明对新显示器的偏好和对触觉反馈的理解有所增加。建议进一步的研究集中于改进设计,取消未使用的指标,并建立一个允许使用可操作的银行限额而不是人为降低限额的银行方案实验。
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引用次数: 2
Receptivity to synthetic jet actuation in boundary layer flows 边界层流动中对合成射流驱动的接受性
A. Palumbo, Onofrio Semeraro, J. Robinet, L. Luca
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Receptivity to synthetic jet actuation in boundary layer flows Andrea Palumbo, Onofrio Semeraro, Jean-Christophe Robinet, Luigi de Luca
它是一个多学科的开放获取档案,用于科学研究文件的存储和传播,无论它们是否出版。这些文件可能来自法国或国外的教学和研究机构,也可能来自公共或私人研究中心。HAL开放多学科档案旨在存放和传播来自法国或外国教育和研究机构、公共或私人实验室的已发表或未发表的研究级科学文件。Andrea Palumbo, Onofrio Semeraro, Jean-Christophe Robinet, Luigi de Luca
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引用次数: 1
Database-driven Safe Flight Envelope Protection for Impaired Aircraft 数据库驱动的受损飞机安全飞行包线保护
Yong Zhang, Yamin Huang, Q. Chu, C. C. Visser
In this paper, an online flight envelope protection system is developed and implemented on impaired aircraft with structural damage. The whole protection system is designed to be a closed-loop of several sub-systems, including system identification, damage classification, flight-envelope prediction and fault-tolerant control. Based on the information given by damage classification, the flight envelopes are explicitly retrieved and processed online from the database and fed into the fault-tolerant controller, which makes the protection system adaptive to a wide range of abnormal conditions. Simulation results show that with envelope protection, loss-of-control accidents are more likely to be prevented, since both the controller and pilots are aware of the shrunken flight envelopes after damage and excessive commands are restricted. In this way, the fault-tolerance of the impaired aircraft can be effectively enhanced.
本文针对结构损伤的飞机,开发并实现了在线飞行包线保护系统。整个保护系统被设计成由系统识别、损伤分类、飞行包络线预测和容错控制等子系统组成的闭环系统。基于损伤分类给出的信息,明确地从数据库中检索和在线处理飞行包线,并将其输入到容错控制器中,使保护系统能够适应广泛的异常情况。仿真结果表明,采用包线保护后,管制员和飞行员都能意识到损坏后的飞行包线收缩,限制了过度的指令,更有可能防止失控事故的发生。这样可以有效地提高受损飞机的容错性。
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引用次数: 3
Attitude Control of an Underactuated Planar Multibody System Using Momentum Preserving Internal Torques 欠驱动平面多体系统的保动量内力矩姿态控制
Federico Trovarelli, M. McRobb, Zhongxu Hu, C. McInnes
In the last few years interest in versatile reconfigurable arrays for space applications has been growing and several concepts tailored for different mission needs have been proposed. Nevertheless, a compelling application that justifies their higher cost and complexity with respect to conventional systemshas not yet been found. Here a novel approach to the design of an Attitude Control System (ACS) for small reconfigurable spacecraft is proposed. It shall exploit momentum-preserving internal torques generated by the modules of the multibody array rotating relative to each other. The goal is to achieve better performance in efficiency, accuracy and robustness with respect to state-of-the-art ACSs, which is a bottleneck of small spacecraft technology. This paper investigates the characteristic behaviour of a planar multibody array whose attitude is controlled using internal joint torques. To do this, relevant reorientation trajectories are shown and discussed. With respect to previous work in the field, optimal attitude control trajectories that take into account module impingement are discussed and the dynamics of momentum-preserving manoeuvres is explained in detail from both physical and mathematical points of view. The results demonstrate that further development of the concept is desirable.
在过去几年中,人们对用于空间应用的多功能可重构阵列的兴趣不断增长,并提出了针对不同任务需求量身定制的几个概念。然而,目前还没有一个令人信服的应用证明,相对于传统系统,它们的成本和复杂性更高。提出了一种小型可重构航天器姿态控制系统的设计方法。它应利用多体阵列模块相对旋转产生的保持动量的内部扭矩。目标是相对于最先进的ACSs在效率、精度和稳健性方面实现更好的性能,这是小型航天器技术的瓶颈。研究了用关节内转矩控制姿态的平面多体阵列的特性。为此,显示并讨论了相关的重定向轨迹。针对该领域以前的工作,讨论了考虑模块撞击的最优姿态控制轨迹,并从物理和数学的角度详细解释了动量保持机动的动力学。结果表明,进一步发展这一概念是可取的。
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引用次数: 2
期刊
Applied aerodynamics : papers presented at the AIAA SciTech Forum and Exposition 2020 : Orlando, Florida, USA, 6-10 January 2020. AIAA SciTech Forum and Exposition (2020 : Orlando, Fla.)
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