Development and validation of a next-generation conceptual aero-structural sizing suite

Abstract

An overview of a novel variable-fidelity aerostructural computational suite targeted for prediction at the conceptual design phase is presented herein. The computational suite consists of two primary modules known as CADac (Computer Aided Design Aircraft) and NeoCASS (Next generation Conceptual Aero-Structural Sizing Suite). The methodology is based upon the integration of geometry construction, aerodynamic and structural analysis codes that combine depictive, computational, analytical, and semiempirical methods, validated in an aircraft design environment. The aerodynamics sub-space is analyzed using methods based upon a Vortex-Lattice Method used to examine large structural deformations, a Doublet Lattice Method in order to predict flutter boundaries in the subsonic speed regime, and, an Euler based method to cater for identification of flutter points in the transonic regime. A quasi-analytical method that provides accurate weights estimation and refined prediction of airframe moments of inertia data has also been introduced, thus facilitating a more comprehensive investigation of the quasi-static aeroelastic problem. To illustrate the new computational system capabilities, the methodology was applied to a complete flexible structural model of the B747-100 transport aircraft. The quasianalytical weight prediction of the NeoCASS suite was found to generate an accuracy of less than 0.5% error compared to published results.

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ORCID for A. Da Ronch: orcid.org/0000-0001-7428-6935

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