in the present paper, the aeroelastic stability of helicopter rotor blade is determined using aeroelastic frequency response function. the aeroelastic model of blade is obtained by combining dowell - hodges beam model with loewy unsteady aerodynamic theory which considers an unsteady wake beneath the rotor. equations are formed and aeroelastic frequency response functions are obtained by invert...

Converter-connected resources, such as electric vehicles and stationary batteries, are being recognized by grid operators contributors to frequency stability. Their fast-response potential makes them ideal candidates provide fast control. In this paper we discuss present evidence on what kind of dynamics a power system experiences when using Initially, method assess balance deriving so called r...

This writing discusses the appearance of peaks and valleys in Allan deviation plots (also known as sigma-tau, root Avar, or Adev plots). This distinctly oscillatory pattern, especially at long-term T-values, usually means the presence of quasi-sinusoidal frequency modulation of an oscillator’s signal. However, quasi-sinusoidal oscillatory behavior in sigma-tau plots at long 7 may be due t o sta...

In the present paper, the aeroelastic stability of helicopter rotor blade is determined using Aeroelastic Frequency Response Function. The conventional methods of aeroelastic stability usually use an iterative procedure while the present method does not require such approach. Aeroelastic Frequency Response Functions are obtained by inverting dynamic stiffness matrix of the aeroelastic system. S...