Free vibrations analysis of the aircraft IAR-99 HAWK based on a new and modern finite element model

Abstract

For the doctoral study on the influence of the aircraft external stores over the aeroelasticity behavior of the IAR-99 HAWK, we have developed a new Finite Elements Model (FEM) with new state-of-the-art methods and technologies available at the end of 2020. After creating a new Finite Elements Model (FEM) of the aircraft IAR-99 HAWK using special elements, the team decided to validate the results by performing a free-free vibrations analysis on this model. In this presentation we have described the finite elements used and their peculiarities, the finite elements model obtained for the aircraft IAR-99 HAWK and the results of the free-free vibrations analysis obtained in the empty equipped configuration. The results of the theoretical free-free vibrations obtained for the IAR-99 HAWK in the empty equipped configuration are presented and compared to those obtained from ground tests, thus confirming the accuracy of the new Finite Element Model (FEM). The new Finite Element Model (FEM) of the IAR-99 HAWK will be versatile enough to provide insight into the structural behavior of the aircraft, regardless of the phenomenon for which it is analyzed: static stress, aerodynamic simulations, flutter, etc.

Keywords

• finite element method
• finite element model
• aeroelasticity
• free-free vibrations
• empty equipped configuration
• ground vibration tests
• msc patran
• msc nastran