Dynamic damage analysis of airfoil flutter for a generic hypersonic flight vehicle

Abstract

The main aim of this paper is to establish the relationship between the airfoil flutter with the flight dynamics of a generic hypersonic flight vehicle (HFV) and analyze the airfoil damage variation during the airfoil flutter. Based on the motion equations of the two degrees of freedom airfoil model and the longitudinal dynamics of the HFV, an airfoil dynamic model is established. By using a coupling equation, the relationship between airfoil flutter and the flight dynamics is estimated. According to the stress–strain ([Formula: see text]) model and the strain–fatigue damage ([Formula: see text]) model, the influence of the stress on the airfoil flutter damage is analyzed. The simulation results show that the flutter of the airfoil is closely related to the flight dynamics for the HFV and the airfoil flutter damage is closely related to the flutter amplitude of the airfoil.

Experimental and Numerical Flutter Analysis Using Local Piston Theory with Viscous Correction

“…Firstly, many researchers have concentrated on 2-dimensional airfoil models to explore the intrinsic dynamic mechanisms of flutter [2,16,21,22]. Yates and Bemmett [2] made flutter calculations for rectangular wings with diamond airfoils and with pitch and translational degrees of freedom using three methods, a modified strip analysis incorporating shock expansion theory, a modified Newtonian flow theory, and LPT.…”

“…Chawla [21] discussed the limitations of the piston theory, derived the aerodynamic forces on oscillating airfoils, including general double and single-wedge and parabolic biconvex profiles, and studied the effect on the flutter speed and frequency of the airfoil thickness and profile, initial AOA and flight altitude. Furthermore, Zhang et al [22] investigated the relationship between the flutter and the flight dynamics of a 2-degree-of-freedom airfoil and analyzed the airfoil damage variation during flutter. They found a correlation between the airfoil flutter and the flight dynamics and a relationship between the flutter damage and the flutter amplitude of the airfoil.…”

Analysis of damage characteristics of an aeroelastic model for air-breathing hypersonic vehicles

“…Therefore, Wang et al (2019) performed the wing force analysis and structural reliability calculations for a hypersonic flight vehicle (HFV). Based on results obtained by Wang et al (2019), Ying et al (2019) presented a new continuous damage dynamic model of the wing for an HFV, and Zhang et al (2019) studied the influence of wing dynamics on the damage when the wings were fluttering.…”

“…The damages caused by elastic deformation are critical for studying the damage characteristics of AHFVs more accurately, and they should be considered in further research. In addition, the damage models in the results of Wang et al (2019) and Zhang et al (2019) for AHFVs mainly focused on the wings (Ying et al , 2019). Therefore, it is necessary to develop a new damage model for the entire body with the elastic dynamics of AHFVs rather than being limited to the wings.…”