대변형 보 이론을 이용한 전진 비행시 무힌지 로우터 블레이드의 공탄성 해석

Abstract

In this study, the aeroelastic analysis of hingeless rotor blades in the forward flight using large defelction beam theory is performed. In the forward flight condition, deflections of the rotor blades are obtained by applying the full finite element equations based on a large deflection beam theory to the time finite element method. A two-dimensional, quasi-steady strip theory including compressibility and reverse flow effects is applied to the aerodynamic computation. The nonlinear, periodic blade response is obtained through a coupled trim procedure considering the deformation of blades and the vehicle trim simultaneously. After an equilibrium state is determined, the aeroelastic stability analysis is performed for the linearized stability equations with respect to the equilibrium condition. Effects of the precone angle and pretwist on the nonlinear, periodic response and the aeroelastic stability of blades are investigated.