Experimental Investigations on Aerodynamic Characteristics of the ZHIYUAN-1 Airship

Wang, Xiaoliang; Gong-yi, FU; Duan, Dengping; Shan, Xindi

doi:10.2514/1.c000243

Cited by 58 publications

(33 citation statements)

References 1 publication

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“…Similar behaviour was observed in other works in the literature that did not account for buoyancy effects. This is the case of the experiments on the AKRON, 10 YEZ-2A 12 and ZHIYUAN-1 24,27 airships, that also presented positive C M α .…”

Section: Role Of the Components On The Loads And Pitch Stabilitymentioning

confidence: 99%

“…10 In addition, since the 'AL' is not axisymmetric, at zero pitch angle the pitching moment is not zero, which differs from more traditional airship configurations. 11,12,24,27 …”

Section: Role Of the Components On The Loads And Pitch Stabilitymentioning

confidence: 99%

“…One example is the ZHIYUAN-1 stratospheric airship 27 developed in China. In the UK, the YEZ-2A project 12 was launched to demonstrate the capability of airships as airborne early warning systems for the US Navy.…”

Section: Introductionmentioning

confidence: 99%

“…Suman et al 24 studied the bare hull of the ZHIYUAN-1 stratospheric airship 27 with the unstructured TAU solver of DLR. They used the Reynolds Averaged Navier-Stokes (RANS) equations and fixed the transition point by suppressing the turbulence model in the laminar flow region.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Hybrid Air Vehicles Using Computational Fluid Dynamics

Carrion

Steijl

Barakos

et al. 2016

Journal of Aircraft

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This paper presents an aerodynamic study of bodies related to lighter than air vehicles, using Computational Fluid Dynamics. The work begins with the validation of the CFD method using a 6:1 prolate spheroid. The validated method is then employed for the study of the flow around a shape similar to the Airlander aircraft of Hybrid Air Vehicles Ltd. An overview of the flow around is presented, supported by pressure survey, flow visualisation and transitional flow effects. The sensitivity of the transition location to the Reynolds number is also demonstrated, and the role of each component of the vehicle is analysed in terms of its effect on the flow-field, the lift and drag, and stability in pitch. It was found that the fins contributed the most to increase the lift and drag coefficients.

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Section: Role Of the Components On The Loads And Pitch Stabilitymentioning

confidence: 99%

“…10 In addition, since the 'AL' is not axisymmetric, at zero pitch angle the pitching moment is not zero, which differs from more traditional airship configurations. 11,12,24,27 …”

Section: Role Of the Components On The Loads And Pitch Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Hybrid Air Vehicles Using Computational Fluid Dynamics

Carrion

Steijl

Barakos

et al. 2016

Journal of Aircraft

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“…This is due to the fact that substantial parts of the aerodynamic lift are generated at the forward part of the hull. Wind tunnel experiments on the AKRON [2], YEZ-2A [3] and ZHIYUAN-1 [4,5] airships are available in the literature. All of them presented static unstable behaviour, as the rigid models were employed and buoyancy was not accounted for.…”

mentioning

confidence: 99%

Study of Hybrid Air Vehicle Stability Using Computational Fluid Dynamics

Carrion

Biava

Barakos

et al. 2017

Journal of Aircraft

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This paper uses Computational Fluid Dynamics to predict aerodynamic damping of airships or hybrid air vehicles. This class of aircraft is characterised by large lifting bodies combining buoyancy and circulatory lift. Damping is investigated via forced oscillations of the vehicle in pitch and yaw. The employed method is verified using data for lighter than air vehicles. The use of fins and stabilisers was found to be beneficial. The rear part of the body was dominated by separated flow that contained more frequencies than the forcing frequency imposed on the body. The final design is seen to be dynamically stable across a range of conditions for small pitch angles.Nomenclaturė

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Adaptive finite‐time neural backstepping control for multi‐input and multi‐output state‐constrained nonlinear systems using tangent‐type nonlinear mapping

Yan

Zhou

Liang

et al. 2020

Intl J Robust & Nonlinear

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SummaryThis article focuses on the problem of adaptive finite‐time neural backstepping control for multi‐input and multi‐output nonlinear systems with time‐varying full‐state constraints and uncertainties. A tan‐type nonlinear mapping function is first proposed to convert the strict‐feedback system into a new pure‐feedback one without constraints. Neural networks are utilized to cope with unknown functions. To improve learning performance, a composite adaptive law is designed using tracking error and approximate error. A finite‐time convergent differentiator is adopted to avoid the problem of “explosion of complexity.” By theoretical analysis, all the signals of system are proved to be bounded, the outputs can track the desired signals in a finite time, and full‐state constraints are not transgressed. Finally, comparative simulations are offered to confirm the validity of the proposed control scheme.

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Experimental Investigations on Aerodynamic Characteristics of the ZHIYUAN-1 Airship

Cited by 58 publications

References 1 publication

Analysis of Hybrid Air Vehicles Using Computational Fluid Dynamics

Analysis of Hybrid Air Vehicles Using Computational Fluid Dynamics

Study of Hybrid Air Vehicle Stability Using Computational Fluid Dynamics

Adaptive finite‐time neural backstepping control for multi‐input and multi‐output state‐constrained nonlinear systems using tangent‐type nonlinear mapping

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