Study of the Effect of Pressurization on the Vibration Frequencies of “Aircraft Hoop Frames”

Resumo

In this paper, structures referred to as "Hoop Frames" are modelled. Their physical and behavioral characteristics are akin to closed planar frames. These structures are generally composed of high-strength metal alloy elements. Such systems are part of the structural framework responsible for supporting the fuselage of commercial aircraft, where pressurization loads act directly. These loads induce high axial tensile stresses in the structural elements, altering the geometric stiffness of the system and, consequently, its vibration frequencies. By employing a program based on the Finite Element Method, numerical models composed of bar elements are developed and subjected to various levels of loading due to pressurization. The objective of the study is to evaluate the influence of geometric stiffness on the vibration frequencies of these structures