This chapter highlights the mechanics of helicopter flight in terms of three aspects: trim, stability, and response. Helicopter vertical motion in hover is probably the simplest to analyze, but even simplifying approximations break down at higher frequencies and amplitudes, as unsteady aerodynamics, blade stall, and rotor dynamic effects alter the details of the motion considerably. The chapter presents the techniques for describing and analyzing trim and stability. Stability analysis requires linearization about a trim point and an examination of the eigenvalues and eigenvectors of the system. The chapter deals with linear, narrow range approximations that highlight how the various aerodynamic effects interact to shape the natural modes of helicopter motion. Helicopter flight dynamics has its share of essentially nonlinear phenomena including vortex‐ring state, main rotor wake‐tail rotor interactions, rotor stall, and rotor wake‐empennage interactions.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Modelling Helicopter Flight Dynamics: Trim and Stability Analysis


    Contributors:

    Published in:

    Publication date :

    2018-11-12


    Size :

    97 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English