Optimization of joined-wing aircraft

Gallman, John W.; Smith, Stephen C.; Kroo, Ilan

doi:10.2514/3.46432

Cited by 72 publications

(49 citation statements)

References 10 publications

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“…The most important benefits [9] of this configuration over the conventional airplanes are the reduced structural weight and the lower induced and overall drag. Preliminary design of joined wing aircraft led to the testing of several models in wind tunnel [10,11].…”

Section: Innovative Aircraft Conceptsmentioning

confidence: 99%

“…Recently, an MDO approach was applied to the concept to seek a better synergy among the various disciplines involved in the design of the aircraft. Gallman et al [9] designed the aircraft for minimum Direct Operating Cost (DOC) and showed a 4% increase in DOC over a cantilever comparator. Structural optimization employing a minimum weight optimization approach or a fully stressed design method was also applied to the joined wing concept by Gallman and Kroo [12].…”

Section: Innovative Aircraft Conceptsmentioning

confidence: 99%

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Numerical prediction of the interference drag of a streamlined strut intersecting a surface in transonic flow

Tetrault

2000

38th Aerospace Sciences Meeting and Exhibit

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In transonic flow, the aerodynamic interference that occurs on a strut-braced wing airplane, pylons, and other applications is significant. The purpose of this work is to provide relationships to estimate the interference drag of wing-strut, wing-pylon, and wing-body ar- his office, leaving with more answers than questions. I also appreciate the fact that he has always had a friendly attitude towards me. I have enjoyed interacting with Dr. Kapania, whose cheerful attitude and perpective on life and research is very similar to mine. I would like to acknowledge the contribution of Dr. Grossman to the team in the field of numerical calculations and his desire of improving the life of the graduate students by forming the Graduate Advisory Committee. Dr. Raj deserves a lot of thanks for providing me with useful advice throughout this project despite his busy schedule. I appreciate the fact that he has always been interested in knowing more about the evolution of my research work and career. The "virtual" presence of Dr. Haftka during our weekly meetings has been very beneficial because of his ability to foresee difficulties and to get the team members to not lose sight of the big picture.

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Section: Innovative Aircraft Conceptsmentioning

confidence: 99%

Section: Innovative Aircraft Conceptsmentioning

confidence: 99%

Numerical prediction of the interference drag of a streamlined strut intersecting a surface in transonic flow

Tetrault

2000

38th Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

show abstract

“…Nowadays, attempts to design a joined wing airplane are more frequent, but in most cases researchers concentrate on the primary configuration of a joined wing airplane, with the front wing below the aft wing [3][4][5][6][7][8][9][10][11][12][13][14]. The previous experience of the authors [15] led to the conclusion that the joined wing airplane could fly much better in an upside down configuration.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of the Optimized Inverted Joined Wing Airplane Concept and Classical Configuration Airplanes

Sieradzki¹,

Dziubiński²,

Galiński³

2016

Archive of Mechanical Engineering

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The joined wing concept is an unconventional airplane configuration, known since the mid-twenties of the last century. It has several possible advantages, like reduction of the induced drag and weight due to the closed wing concept. The inverted joined wing variant is its rarely considered version, with the front wing being situated above the aft wing. The following paper presents a performance prediction of the recently optimized configuration of this airplane. Flight characteristics obtained numerically were compared with the performance of two classical configuration airplanes of similar category. Their computational fluid dynamics (CFD) models were created basing on available documentation, photographs and some inverse engineering methods. The analysis included simulations performed for a scale of 3-meter wingspan inverted joined wing demonstrator and also for real-scale manned airplanes. Therefore, the results of CFD calculations allowed us to assess the competitiveness of the presented concept, as compared to the most technologically advanced airplanes designed and manufactured to date. At the end of the paper, the areas where the inverted joined wing is better than conventional airplane were predicted and new research possibilities were described.

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“…This means that the critical buckling load of the rear wing may have an impact on the final structural weight. Early studies by Gallman et al [15,16] showed that when a buckling analysis is carried out, the joined-wing is actually worse than the conventional aircraft, at least in terms of Direct Operating Cost (DOC). The reason for this is that when the buckling load is a critical design parameter, although structural weight is saved on the front wing due to the reduction in root bending moment, weight must be added to the rear wing to resist buckling.…”

Section: Nomenclaturementioning

confidence: 99%

Buckling Alleviation for Joined-Wing Aircraft

Lambert

Cooper

Nangia

2016

Journal of Aircraft

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. University of Bristol, BS8 1TR, United KingdomA novel mechanism is described that increases the critical buckling load of the rear wing of joinedwing aircraft, in an effort to reduce structural weight. The benefits of the joined-wing configuration are briefly discussed, along with its current limitations. The behaviour of the modified structure under lift is investigated by conducting a number of linear structural analyses for varying geometric arrangements. It is shown that the mechanism, called the Buckling Alleviation Component (BAC), is effective in reducing structural weight for a significant proportion of aircraft geometries, even though there is a trade-off between rear wing buckling load and front wing root bending moment. A more detailed structural model is used to investigate the effect of geometric structural nonlinearities. The nonlinear analysis shows that the BAC delays the onset of nonlinear behaviour and that the critical buckling loads of the conventional configuration are drastically overestimated by the linear analysis, which means that BAC performs much more effectively than the initial linear analysis suggests.

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Optimization of joined-wing aircraft

Cited by 72 publications

References 10 publications

Numerical prediction of the interference drag of a streamlined strut intersecting a surface in transonic flow

Numerical prediction of the interference drag of a streamlined strut intersecting a surface in transonic flow

Performance Comparison of the Optimized Inverted Joined Wing Airplane Concept and Classical Configuration Airplanes

Buckling Alleviation for Joined-Wing Aircraft

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