Análise numérica e experimental do comportamento dinâmico de um sistema rotor-palhetas

Abstract

The rotor-bladed systems are commonly used in industrial applications, such as in turbines, ventilators, and compressors. One interesting way to understand their dynamic behavior and characteristics is to work with representative mathematical models. Therefore, this work aims to study the mathematical model of a system in which the rotor, considered as rigid, is coupled with four flexible rotating blades. The equations of motion are derived using Lagrange dynamics, resulting in time dependent and periodic matrices. Thus, the model can be considered as linear time variant. The equations of motion are discretized using the finite element method and solved numerically to obtain the vibration responses of the model. Additionally, a stability analysis is presented employing the Floquet’s theory and the multiblade coordinate transformation. Finally, experiments were carried out to identify the modal parameters of the rotor-bladed system. Hence, a comparison was made to highlight the model representativeness and its limitations.