An MDO design methodology for the concurrent aerodynamic/cost design of MAGLEV vehicles

Tyll, J.; Eaglesham, M.; Schetz, Joseph A.; Deisenroth, M.; Mook, Dean T.

doi:10.2514/6.1996-4036

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Especially noteworthy is the correct shape of the pressure distribution under the vehicle from the vortex panel method, which cannot be predicted by inviscid, low-order methods. Based on this success, the vortex panel method was integrated into an multidisciplinary design and optimization code for Maglev vehicle shape design (Tyll et al 1996b. The method proved capable of predicting minimum drag shapes quite close to those resulting from RANS CFD studies, described below.…”

Section: Discussionmentioning

confidence: 99%

AERODYNAMICS OF HIGH-SPEED TRAINS

Schetz

2001

Annu. Rev. Fluid Mech.

217

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This review highlights the differences between the aerodynamics of high-speed trains and other types of transportation vehicles. The emphasis is on modern, high-speed trains, including magnetic levitation (Maglev) trains. Some of the key differences are derived from the fact that trains operate near the ground or a track, have much greater length-to-diameter ratios than other vehicles, pass close to each other and to trackside structures, are more subject to crosswinds, and operate in tunnels with entry and exit events. The coverage includes experimental techniques and results and analytical and numerical methods, concentrating on the most recent information available.

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Section: Discussionmentioning

confidence: 99%

AERODYNAMICS OF HIGH-SPEED TRAINS

Schetz

2001

Annu. Rev. Fluid Mech.

217

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“…5 The initial work employed earlier versions of the cost models and an earlier version of the aerodynamics model which was capable of predicting out of ground effect flow only. 4 MAGLEV vehicles. The design methodology, developed in part by the authors 4 , 5 has been created to operate in an automated fashion, and it is modular to allow for the continual improvement of the individual models.…”

Section: Introductionmentioning

confidence: 99%

Concurrent aerodynamic shape/cost design of magnetic levitation vehicles using MDO techniques

Tyll

Schetz

1998

7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization

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IntroductionThe work presented here demonstrates optimizations to link the aerodynamic shape design to the system costs for magnetically levitated vehicles utilizing a multidisciplinary design optimization methodology. These railed vehicles can cruise at speeds approaching that of short haul aircraft and travel just inches from its guideway. They are slated for high speed intercity service of up to 500 miles in length and would compete with air shuttle services. The realization of this technology hinges upon economic viability which is the impetus for the design methodology used here. This methodology involves models for the aerodynamics, structural weight, direct operating cost, acquisition cost, and life cycle cost and utilizes the DOT optimization software. Optimizations are performed using sequential quadratic programming for a 7 design variable problem. The MDO methodology proves to be a useful tool for the design of MAGLEV vehicles. The optimizations show significant and sensible differences between designing for minimum life cycle cost and other figures of merit. The optimizations also show a need for a more sensitive acquisition cost model which is not simply based on weight engineering. Nomenclaturex dimension parallel to solid surface y dimension perpendicular to solid surface 'Graduate student, AIAA Member, now at GASL, Inc. t J. Byron Maupin Professor, AIAA Fellow

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“…Tyll et al 7 presents a design methodology for MAGLEV trains that takes aerodynamics and cost into effect.…”

Section: A Levels Of Aerodynamic Modeling 147mentioning

confidence: 99%

Trim angle of attack of flexible wings using non-linear aerodynamics

Cohen¹

1998

7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization

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Aerospace and Ocean Engineering (ABSTRACT)Multidisciplinary interactions are expected to play a significant role in the design of future high-performance aircraft (Blended-Wing Body, Truss-Braced wing, High Speed Civil transport, High-Altitude Long Endurance aircraft and future military aircraft). Also, the availability of supercomputers has made it now possible to employ high-fidelity models (Computational Fluid Dynamics for fluids and detailed finite element models for structures) at the preliminary design stage. A necessary step at that stage is to calculate the wing angle-of-attack at which the wing will generate the desired lift for the specific flight maneuver. Determination of this angle, a simple affair when the wing is rigid and the flow regime linear, becomes difficult when the wing is flexible and the flow regime non-linear. To solve this inherently nonlinear problem, a Newton's method type algorithm is developed to simultaneously calculate the deflection and the angle of attack. The present algorithm requires the sensitivity of the aerodynamic pressure with respect to each of the generalized displacement coordinates needed to represent the structural displacement. This sensitivity data is easy to determine analytically when the flow regime is linear. The present algorithm uses a finite difference method to obtain these sensitivities and thus requires only the pressure data and the surface geometry from the aerodynamic model. This makes it ideally suited for nonlinear aerodynamics for which it is difficult to obtain the sensitivity analytically.The present algorithm requires the CFD code to be run for each of the generalized coordinates. Therefore, to reduce the number of generalized coordinates considerably, we employ the modal superposition approach to represent the structural

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An MDO design methodology for the concurrent aerodynamic/cost design of MAGLEV vehicles

Cited by 4 publications

References 8 publications

AERODYNAMICS OF HIGH-SPEED TRAINS

AERODYNAMICS OF HIGH-SPEED TRAINS

Concurrent aerodynamic shape/cost design of magnetic levitation vehicles using MDO techniques

Trim angle of attack of flexible wings using non-linear aerodynamics

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