Cea, AlvaroAlvaroCeaPalacios, RafaelRafaelPalacios2022-06-272022-07-25Journal of Aircraft: devoted to aeronautical science and technology, 2022, 60 (1), pp.205-2200021-8669http://hdl.handle.net/10044/1/97813This paper investigates geometrically-nonlinear aeroelastic effects on an industry-level aircraft configuration. Results are obtained via a new approach that uses geometrical information to compute nonlinear effects and seamlessly integrates with conventional, linear aeroelastic load packages. The starting point is a generic finite-element model and frequency-domain aerodynamic influence coefficient matrices, and the resulting system includes control inputs, longitudinal trim, or gust disturbances in time domain, which can be employed separately or in combination to obtain a nonlinear dynamic model for loads and stability analysis. The aeroelastic response of a long range aircraft is studied, highlighting the difference between linear and nonlinear approaches in the calculations of the aircraft flying equilibrium, dynamic perturbations, and variations to the flutter boundary. Results justify the need for geometrically nonlinear analysis in the production environment of airplanes with ultra high aspect ratio wings.Copyright © 2022 by Alvaro Cea and Rafael Palacios. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-3868 to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.Journal Articlehttps://www.dx.doi.org/10.2514/1.C036740https://arc.aiaa.org/doi/10.2514/1.C036740