Variable Complexity Response Surface Design of an HSCT Con guration

A variable complexity response surface methodology has been applied to the multidisciplinary design of a High Speed Civil Transport HSCT The term variable complexity refers to a design procedure in which re ned computation ally expensive analysis techniques are combined with simple computationally inexpensive techniques We have used the simple analysis methods to de ne a subregion of the design space in which an optimal HSCT design is likely to ex ist The re ned analysis methods were then used to construct smooth response surface models of various aerodynamic and structural weight quantities Aero dynamic response surface models were constructed for volumetric wave drag and supersonic drag due to lift based on an example problem involving four HSCT wing design variables Optimization was then performed for the complete HSCT con guration using the aerodynamic response surface models Preliminary re search on the development of a structural response surface model for the wing bending material weight is also described In addition to the results for the variable complexity response surface modeling and optimization performance data are presented for a coarse grained parallelization of the aerodynamic and structural analyses Introduction The use of multidisciplinary optimization techniques in aerospace vehicle design often is limited because of the signi cant computational expense incurred in the analysis of the vehicle and its many systems In response to this di culty a variable complexity model ing approach involving the use of re ned and computationally expensive models together with simple and computationally inexpensive models has been developed This variable complexity technique has been previously applied to the combined aerodynamic structural optimization of subsonic transport aircraft wings and the aerodynamic structural op timization of the High Speed Civil Transport HSCT In related research conducted by members of the Multidisciplinary Analysis and Design MAD Center for Advanced Vehicles at Virginia Tech several improved HSCT designs have This work was supported by NASA Grant NAG y Research Assistant Dept of Aerospace Ocean Eng Virginia Tech Blacksburg VA x Research Assistant Dept of Computer Science Virginia Tech Blacksburg VA Professor Dept Head Dept of Aerospace Ocean Eng Virginia Tech Blacksburg VA z Professor Dept of Aero Eng Mech Eng Sci University of Florida Gainesville FL Professor Dept of Aerospace Ocean Eng Virginia Tech Blacksburg VA Professor Depts of Computer Sci and Math Virginia Tech Blacksburg VA

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