Estimation of coefficients for apparent additional fluid masses within elastic oscillating cavities

Аuthors

Shklyarchuk F. N.^1*, Twin K. ²

1. Institute of Applied Mechanics of Russian Academy of Science, IAM RAS, 32a, Leninskii av., Moscow, В-334, GSP-1, 119991, Russia
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: shklyarchuk@list.ru

Abstract

Aircraft wing compartments bounded with spars, ribs end lower skin can be filled partly with liquid fuel. A flowability of the liquid influences on dynamical properties and flutter behaviour of elastic wings. In order to evaluate this influence it is necessary to solve a fluid oscillation problem foe each compartment of the wing and to find appartment additional fluid masses then to derive equations of elastic oscillations for considerate structure. These equations are solved by means of a variational technique. The technique reduces the original problem to ordinary differential equation set. The derived equations are solved with numerical integration.