Longitudinal Control for Balloon-Borne Launched Solar Powered UAVs in Near-Space

Hu, Yanpeng; Guo, Jun; Meng, Wenyue; Liu, Guanyu; Xue, Wenchao

doi:10.1007/s11424-022-1302-6

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…Zúñiga, Souza, and Góes [28] proposed a beam model based on a combination of modal and flight dynamics to study the flight-structure coupling characteristics of solar-powered UAVs, emphasizing the airspeed changes on structural safety. Hu et al [29] proposed a method to calibrate a rigid-body flight dynamic model using flexible beam model for drop-in solarpowered UAVs. Bras, Warwich, and Suleman [30] also proposed a strain beam modal experiment-flight synthesis, pointing out the need for multidisciplinary optimal design of UAVs, emphasizing the potential impact of increased airspeed.…”

Section: Helios Zephyr S Aquilamentioning

confidence: 99%

Comparative Study and Airspeed Sensitivity Analysis of Full-Wing Solar-Powered UAVs Using Rigid-Body, Multibody, and Rigid-Flexible Combo Models

Guo,

Mu,

Zhou

et al. 2024

International Journal of Aerospace Engineering

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Solar-powered UAVs are characterized by large-scale, lightweight, and low airspeed, and changes in airspeed lead to wing deformation or stalling, which can easily induce serious flight accidents. A single dynamic model cannot accurately describe this feature, and this airspeed sensitivity can only be analyzed by integrating rigid-body, multirigid-body, and rigid-flexible combo models. This paper proposes a dynamic analysis method for a mixture of rigid-body, multirigid-body, and rigid-flexible combo models, considering the applicable airspeed ranges, computational costs, and structural deformation assumptions of the three models and comparing the differences of modes and responses at different airspeeds, and quantitatively analyzes the effects of airspeed on the motion, deformation, and coupling. The results show that appropriate increase of airspeed is beneficial to the stability of large-scale lightweight platforms, but when it is increased to more than two times the cruise speed, the structural deformation is coupled with the flight dynamic modes, leading to the deterioration of the overall dynamic response. Finally, a mixture of the three models at different airspeeds is proposed, which is necessary for future ultralarge-scale solar-powered UAVs.

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Section: Helios Zephyr S Aquilamentioning

confidence: 99%

Comparative Study and Airspeed Sensitivity Analysis of Full-Wing Solar-Powered UAVs Using Rigid-Body, Multibody, and Rigid-Flexible Combo Models

Guo,

Mu,

Zhou

et al. 2024

International Journal of Aerospace Engineering

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“…Hence, air-drop launch technology offers broad application opportunities in the fields of high-altitude aircraft, fast-deploying UAVs, and alien exploration [9]. Although much research on air-drop launch technology has been conducted in recent decades [3,[10][11][12], there are still open questions that need to be understood if further improvements are to be realized.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Free-Fall Dynamic Behavior of a Rectangular Wing with Variable Center of Mass Location and Variable Moment of Inertia

et al. 2023

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In recent years, the air-drop launch technology of near-space UAVs has attracted much attention. Between downfall from the carrier and the flight control system’s initiation, the UAV presents free-fall movement. This free-fall process is very important for the control effect of the flight control system and is also crucial for the safety of the UAV and the carrier. Focus is required on two important dynamic parameters of the UAV: the moment of inertia and the center of mass position. In this paper, we used a quasi-steady model proposed by predecessors to address the flat-plate falling problem with modifications to describe the freely falling motion of the wing. Computational fluid dynamics (CFD) were used to simulate the free-fall movement of the wing with various parameters, and the wing release behavior was analyzed to check the quasi-steady model. Research shows that the movement characteristics of the falling wing are mostly reflected in the longitudinal plane, and the developed quasi-steady analytical model can more accurately describe the dynamic behavior of free-fall to some extent. By using CFD methods, we further investigated the aerodynamic performance of the free-fall wing. The results show that the wing mainly presents tumbling and fluttering motion. Changing the moment of inertia around the tumbling axis changes the tumbling frequency and the time point as the wing enters tumbling. In contrast, changing the position of the center of mass significantly changes the form of falling and makes the free-fall motion more complex. Therefore, it is necessary to carefully configure the center of mass in the UAV design process.

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“…Near-space (i.e., 20–100 km above the ground) vehicles have been becoming the focus of research and developing in the world due to the strategic significance (e.g., dealing with various tasks such as high-resolution earth observation, communication relay, atmospheric research, and so on) in numerous fields and great flight condition (e.g., low atmospheric density and strong solar radiation) [ 1 , 2 , 3 ]. Low- speed near-space vehicles utilize conventional taxiing and taking off mode, thus it has to consume more fuel and take a longer time to climb to the desired height.…”

Section: Introductionmentioning

confidence: 99%

“…In this section, we mainly discuss the background of deep learning based diagnosing method in mechanical field [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. More details about BS-UAV (e.g., structure design or taking off manner) are shown in these works [ 1 , 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Ponder: Enabling Balloon-Borne Based Solar Unmanned Aerial Vehicle’s Take Off Diagnosis under Little Data

Jiao

Shang

et al. 2022

Entropy

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Balloon-borne based solar unmanned aerial vehicle (short for BS-UAV) has been researched prevalently due to the promising application area of near-space (i.e., 20–100 km above the ground) and the advantages of taking off. However, BS-UAV encounters serious fault in its taking off phase. The fault in taking off hinders the development of BS-UAV and causes great loss to human property. Thus, timely diagnosing the running state of BS-UAV in taking off phase is of great importance. Unfortunately, due to lack of fault data in the taking off phase, timely diagnosing the running state becomes a key challenge. In this paper, we propose Ponder to diagnose the running state of BS-UAV in the taking off phase. The key idea of Ponder is to take full advantage of existing data and complement fault data first and then diagnose current states. First, we compress existing data into a low-dimensional space. Then, we cluster the low-dimensional data into normal and outlier clusters. Third, we generate fault data with different aggression at different clusters. Finally, we diagnose fault state for each sampling at the taking off phase. With three datasets collected on real-world flying at different times, we show that Ponder outperforms existing diagnosing methods. In addition, we demonstrate Ponder’s effectiveness over time. We also show the comparable overhead.

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Longitudinal Control for Balloon-Borne Launched Solar Powered UAVs in Near-Space

Cited by 11 publications

References 11 publications

Comparative Study and Airspeed Sensitivity Analysis of Full-Wing Solar-Powered UAVs Using Rigid-Body, Multibody, and Rigid-Flexible Combo Models

Comparative Study and Airspeed Sensitivity Analysis of Full-Wing Solar-Powered UAVs Using Rigid-Body, Multibody, and Rigid-Flexible Combo Models

Investigation of the Free-Fall Dynamic Behavior of a Rectangular Wing with Variable Center of Mass Location and Variable Moment of Inertia

Ponder: Enabling Balloon-Borne Based Solar Unmanned Aerial Vehicle’s Take Off Diagnosis under Little Data

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