Design issues of dynamics of helicopter main rotor blades under the influence of wind in the parking lot

Abstract

The paper addresses the issue of designing helicopter main rotor blades exposed to wind in the parking lot. Necessary wind conditions have been determined to be taken into account when designing the blades. In addition, it shows a method for calculating dynamic stresses in a moored and non-moored helicopter blade blown by a wind flow. The obtained nonlinear partial differential equation by the Galerkin`s method is reduced to a system of differential equations. The Newmark`s method is used for its numerical integration. Formulas are obtained for calculating boundaries of the regions of dynamic instability of moored and non-moored rotor blades of the helicopter. Based on the equations of parametric oscillations of blades, the critical frequencies and excitation coefficients corresponding to the main and two side resonances are determined.