Control of aeroelastic vibration aplling non-linear vibration absorbers with time-delay

• Grant number: 24/12620-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2024
• End date: October 31, 2025
• Field of knowledge: Engineering - Aerospace Engineering - Aerospace Structures
• Principal Investigator: Flávio Donizeti Marques
• Grantee: João Pedro Calegari Mantovani
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated scholarship(s): 24/20435-6 - Assessing higher-order effects of nonlinearities in a 2-DOF airfoil coupled a nonlinear energy sink using discrepancy modeling frameworks, BE.EP.IC

Abstract

Aeroelasticity is an area of science that leads to problems involving the interaction between inertial, elastic, and aerodynamic forces. It determines and explains the causes of many phenomena. One of the most important is the flutter. This interaction between structure (inertial and elastic forces) with the flow (aerodynamics forces) is characterized as an unstable oscillation and auto-excited, which occurs in many structures, for example, in the wings of airplanes. Due to its capacity for destruction and potential catastrophes, its identification and mitigation are important study areas that determine essential criteria for the project at the moment of airplane development. The aeroelastic vibration originating from flutter can be controlled in different ways, whether passively or actively. One of the most explored ways is using devices with nonlinear energy sink (NES). This device contains mass and stiffness, a nonlinear behavior, and damping. Furthermore, it is characterized as a passive control technique for aeroelastic vibrations. Because this technique shows limitations in the band frequency of vibrations that can be absorbed, it is used, jointly with another technique, to suppress the flutter for a higher speed of flow. That way, the control application of the NES with a time delay is explored, i.e., a passive control technique with an active one. The analysis is based on bifurcation diagrams used to check this union's efficiency, which is constructed from a numeric development.