Research on the F/A-18E/F using a 22 percent-dynamically-scaled drop model

Croom, Mark A.; Kenney, H.; Murri, Daniel G.; Lawson, Kenneth

doi:10.2514/6.2000-3913

Cited by 14 publications

(9 citation statements)

References 3 publications

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“…In order to increase the freedom for manoeuvring outside the limitations of a wind tunnel and the size of the subscale models, unpowered models dropped from manned aircraft have also been used in several military and research programmes. Examples where post-stall dynamics have been studied using these susbcale drop models include the X-31 [12,8], the F-4, F-14, F-15 and B-1 [6], and the F/A-18E/F [13]. This technique has also been used to study space vehicles such as the NASA-Ames M2-F1 vehicle [6], the Lockheed Martin X-38 and the Japanese HOPE-X [14].…”

Section: Introductionmentioning

confidence: 99%

On subscale flight testing : Cost-effective techniques for research and development

Rueda

2021

Linköping Studies in Science and Technology. Dissertations

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Section: Introductionmentioning

confidence: 99%

On subscale flight testing : Cost-effective techniques for research and development

Rueda

2021

Linköping Studies in Science and Technology. Dissertations

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“…Dynamically scaled flying models were used for free-flight tests [15][16][17][18]. The validations of modeling methods, flight dynamics characteristics, and control system design beyond the normal flight envelope, which are too risky for full-scale vehicles, could be carried out using the flying models.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Rig for Validation of Control Algorithms at High Angles of Attack

Ignatyev¹,

Sidoryuk²,

Kolinko³

et al. 2017

Journal of Aircraft

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The dynamics of a modern aircraft at high angles of attack is complicated, with hazardous phenomena such as wing rock, stall, and spin. The paper presents a technique for cost-effective and safe studying of conventional and critical flight regimes and control validation using an autonomous scaled aircraft model mounted in a three-degree-offreedom gimbal in a wind tunnel. The similarity of the dynamics at high angles of attack of the wind-tunnel model and the free-flying model is demonstrated. To suppress the wing rock and to prevent the stall, two control laws are designed using linear matrix inequalities and model reference adaptive control techniques. The controllers are tested in a semifree flight of the autonomous scaled model in the wind tunnel. Wing rock suppression and stall and spin prevention are demonstrated.C nΔδ e = ∂C n ∂Δδ e C nδ a = ∂C n ∂δ a C l ; C m ; C n = roll, pitch, and yaw moment coefficients C l0 ; C m0 ; C n0 = static values of roll, pitch, and yaw moment coefficients C mq = ∂C m ∂q c∕2V c = mean aerodynamic chord g = acceleration due to gravity I = matrix of moment of inertia I xx = moment of inertia in roll Iyy = moment of inertia in pitch I zz = moment of inertia in yaw k 1;2θ ; k 1;2ϕ ; k 1;2ψ = friction coefficients M a ; M g ; M f = aerodynamic, gravity, and gimbal friction moments p, q, r = roll, pitch, and yaw rates Q fθ ; Q fϕ ; Q fψ = components of friction moment S = reference wing area V = velocity α, β = angles of attack and sideslip δ = vector of control effectors ΔC lδ r ; ΔC nδ r = increment of roll and yaw moment coefficients due to rudder deflection Δx c:g: ; Δz c:g:= misalignment of the center of mass with respect to the center of gimbals δ e ; Δδ e ; δ a ; δ r = mean stabilator, differential stabilator, aileron, and rudder deflections ϕ; θ; ψ = rotational angles in gimbals in roll, pitch, and yaw

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“…In order to increase the freedom for manoeuvring outside the limitations of a wind tunnel and the size of the subscale models, unpowered models dropped from manned aircraft have also been used in several military and research programmes. Some examples where the post-stall dynamics have been studied using these susbcale drop models are the X-31 [11,7]; the F-4, F-14, F-15, B-1 [5]; and the F/A-18E/F [12]. This technique has also been used for the study of space vehicles such as the NASA-Ames M2-F1 vehicle [5], the Lockheed Martin X-38 and the Japanese HOPE-X [13].…”

Section: Introductionmentioning

confidence: 99%