In aerodynamic design, good performance is generally required under a range of operating conditions, including off-design conditions. This can be achieved throughmultipoint optimization. The desired performance objective and operating conditions must be specified, and the resulting optimization problemmust be solved in such amanner that the desired performance is achieved. Issues involved in fo...

This paper deals with developing an efficient Robust Design Optimization (RDO) framework. The goal is to obtain an aerodynamic shape that is less sensitive to small random geometry perturbations and to uncertain operational conditions. The initial shape is the RAE2822 airfoil which is parameterized with 10 design variables. The robust design formulation used is based on an expectation measure. ...

In Japan, several projects to increase train speed are underway, requiring a new generation pantograph that achieves further reduction in aerodynamic noise. However, as reduction of pantograph noise usually conflicts with the stabilization of its lift force characteristics, a number of experiments have to be conducted to develop a new type of pantograph. The aeroacoustic and lift force characte...

In aerodynamic shape optimization using meta-heuristics such as evolutionary algorithms, the body-fitted mesh method based computer fluid dynamics is often employed. However, it has difficulty in efficiency and accuracy, can undermine advantages of global methods. The generation also decides success or failure individual evaluation. this study, we developed a for on computational that robustly ...

A multidisciplinary design analysis and optimization process is developed at ONERA for the of tube wing blended wing–body aircraft configurations. This composed different disciplinary modules (geometry, propulsion, aerodynamics, structure, handling qualities flight mission), overall considers fidelity levels these each step process. article describes low-fidelity aerodynamic module used during ...