Dynamics simulation of a folding wing unmanned aerial vehicle with the parachute system assisted launching

Zhang, Hangyue; Yang, Yanchu; Cai, Rong

doi:10.1177/09544100221124712

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The gondola integrates energy system, control circuits, communication devices and experiment payload. Multiple UAVs are evenly arranged around the gondola (Zhang et al, 2023a(Zhang et al, , 2023b. The corresponding parameters of the designed "balloon-borne UAV system" are listed in Table 1.…”

Section: Simulation Of the Further Ascent Process For High-altitude B...mentioning

confidence: 99%

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Numerical simulation of postlaunching behaviors for a “balloon-borne UAV system”

Zhang,

Yang,

Cai

2024

AEAT

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Purpose This paper aims to present numerical simulations for a series of flight processes for the postlaunching stage of the “balloon-borne UAV system.” It includes the balloon further ascent motion after airborne launching. In terms of unmanned aerial vehicles (UAVs), the tailspin state and the charge-out process with an anti-tailspin parachute-assisted suspending are analyzed. Then, the authors conduct trajectory optimization simulations for the long-distance gliding process. Design/methodology/approach The balloon kinematics model and the parachute Kane multibody dynamic model are established. Using steady-state tailspin to reduced-order analysis and achieving change-out simulation by parachute suspension dynamic model. A reentry optimization control problem is developed and the Radau pseudo-spectral method is used to calculate the glide trajectory. Findings The established dynamic model and trajectory optimization method can effectively simulate the motion process of balloons and UAVs. The system mass reduction for launching UAVs will not cause damage to the balloon structure. The anti-tailspin parachute can reduce the UAV attack angles effectively. The UAV can glide to the designated target position by adjusting the attack angle and sideslip angle. The farthest flight distance after launching from 20 km height is 94 km and the gliding time is 40 min, which demonstrates the potential application advantage of high-altitude launching. Practical implications The research content and related conclusions of this article achieve a closed-loop analysis of the flight mission chain for the “balloon-borne UAV system,” which provides simulation references for relevant balloon launching experiments. Originality/value This paper establishes a complete set of numerical simulation models and can effectively analyze various postlaunching behaviors.

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Section: Simulation Of the Further Ascent Process For High-altitude B...mentioning

confidence: 99%

“…The opened antitailspin parachute creates a low-pitch moment and slows down the yaw rate. When the tailspin is changed out, the rear elevator deflects again and levels the trajectory in a similar way to the parachuteassisted launching of a UAV (Zhang et al, 2023a(Zhang et al, , 2023b.…”

Section: Unmanned Aerial Vehicle Tailspin Motion and The Change-out S...mentioning

confidence: 99%

Numerical simulation of postlaunching behaviors for a “balloon-borne UAV system”

Zhang,

Yang,

Cai

2024

AEAT

Self Cite

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Analysis of Wind Field Response Characteristics of Tethered Balloon Systems

Pang,

He,

Song

et al. 2024

Aerospace

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Tethered balloon systems encounter various complex wind field environments during flight. To investigate the conditions under which the system can operate safely and smoothly, a longitudinal dynamic model for tethered balloon systems is established. The model incorporates a streamlined balloon shape with its aerodynamic center at the body’s center. Steady-state aerodynamic force coefficients are calculated through simulations and fitted to a function based on the angle of attack within a specified range. The complex cable model is simplified using the lumped mass method, considering the influence of branch cables on the main node position. Experimental results from windless oscillation tests on scaled tethered balloon systems are compared with numerical solutions obtained using the dynamic model under the same conditions, validating the feasibility of the model for simulating different wind field scenarios. Finally, the motion characteristics of tethered balloon systems in different wind fields are analyzed. The numerical simulation results show that in a horizontal step wind field, the cable tension and cable inclination angle increase with the wind speed, and the slower the wind field changes, the shorter the time required for system stabilization. Updrafts greatly increase the likelihood of balloon escape, while downdrafts greatly increase the likelihood of the system making contact with the ground. The findings of this study can provide a basis for selecting suitable wind field conditions and issuing risk warnings for tethered balloon systems.

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Dynamics simulation of a folding wing unmanned aerial vehicle with the parachute system assisted launching

Cited by 2 publications

References 18 publications

Numerical simulation of postlaunching behaviors for a “balloon-borne UAV system”

Numerical simulation of postlaunching behaviors for a “balloon-borne UAV system”

Analysis of Wind Field Response Characteristics of Tethered Balloon Systems

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