Similaridade Dinâmica Aplicada a Modelos de Aeronaves de Asas Rotativas

Abstract

This paper deals with the application of a dynamic similarity method based on the characteristic equations of dynamic systems in a rotating wings aircraft prototype. The main aim is to select a small scaled model whose dynamics is as close as possible to the dynamics of the prototype in the dimensionless domain, favoring an adequate prediction and evaluation of its flight dynamics. The method, widely used in fluid mechanics, presents some particularities that make it an interesting alternative, from the practical point of view, to the dimensional analysis method. To illustrate the use and effectiveness of this method, the Bell UH1H helicopter is taken as a prototype and, as scaled models, four commercial aircrafts are chosen. As a result, it can be observed that the classification of the models that represent the prototype in the dimensionless space depends on both the state variables chosen as priorities and the maneuver to be analyzed