This paper introduces an approach to effectively model the nonlinear aeroelastic behavior of fully flexible aircraft. The study is conducted based on a nonlinear strainedbased finite element framework in which the developed low-order formulation captures the nonlinear (large) deflection behavior of the wings, and the unsteady subsonic aerodynamic forces acting on them. Instead of merely conside...

A rapid shape parameterization tool called PROTEUS is developed for aircraft shape optimization. This tool can be applied directly to any aircraft geometry that has been defined in PLOT3D format, with the restriction that each aircraft component must be defined by only one data block. PROTEUS has eight types of parameterization schemes: planform, wing surface, twist, body surface, body scaling,...

Abstract Research focusing on the multi-phase coupling problem and ditching performance of a certain type aircraft was carried out by volume fluid model full-flow moving mesh method. Compared with experimental results scaled model, pressure predicted this method matches well, maximum error pitch angle is less than 1.5°, which can accurately reflect movement load characteristics during ditching....

The transitional flight of tail-sitter aircraft is a challenging problem because the flight includes a wide operating range with nonlinearity and at low speed approaches the stall. In order to solve this problem, a robust autopilot design method using a variable environment genetic algorithm (VE-GA) is proposed. VE-GA is a new robust optimization method based on a real coded genetic algorithm (...

Notwithstanding the interest in three-surface concept shown by aircraft designers, this configuration was not thoroughly investigated conjunction with adoption of two-elevator surfaces, on both canard and tail. In fact, inclusion an additional elevator produces a redundant longitudinal control which can be specifically exploited to target trim optimization. The same redundancy also employed imp...

A flight test with a simplified hybrid laminar flow control (HLFC) system on the vertical tail plane (VTP) of an A320 aircraft was performed in April/May 2018. This HLFC prototype for ...