Analytical Method On Aeroelasticity Of Hingeless Rotor Using Fully Intrinsic Equations

The aeroelasticity analysis of the hingeless rotor is one of the most complicated problems during the investigations of rotor aerodynamics and dynamics. In order to fit the development requirements of the modern hingeless rotor, we investigate analytical method on aeroelasticity of hingeless rotor; solve the several key problems for the rotor aeroelastic dynamic model. Thus, the investigation in this dissertation could be laid the foundation for the improvement of the analytical method accuracy on aeroelasticity of hingeless rotor.Firstly,based on geometrically exact beam theory, the blade dynamic model is developed, which is suitable for aeroelasticity analysis of helicopter rotor. Due to the application of Rodriguez parameters without the order theme during the process of the derivation of the blade fully intrinsic dynamic equations, the singularities for subsequent rotations of the blade are avoided, and then construct a three-order finite element solution(which is based on the Galerkin approximation) to the intrinsic equations for the nonlinear dynamics of rotor blades.The blade boundary conditions, which is applicable for hingeless rotor, especially new composite hingeless rotor(e.g. the Eurocopter Tiger helicopter), with multiple load paths, is established on the basis of nonlinear dynamics model of rotor blades mentioned above. The rotor system dynamic models, which are composed of blades dynamic models, hub model, bearings models and component relational model, will ensure the components displacement/force consistencies. Coupled with blade fully intrinsic dynamic model, Leishman-Beddoes model, Peters dynamic inflow model and dynamic boundary restraint equation, the rotor comprehensive aeroelastic analysis model is established.According to the above research, the aeroelastic analysis model will be discredited by Newmark average velocity method to implement the steady-state response analysis and rotor structure vibration load. Moreover, the rotor system dynamic models are use for analyzing hingeless rotor stability.Finally, this article has conducted lots of verifiable example study. By comparisons with the theoretic analysis and experimental test in foreign countries, it demonstrates that the all aspects(geometric nonlinear large deformation analysis, modal analysis, aeroelastic response calculation, the accurately treatment of boundary conditions, blade vibration loads calculation and rotor aeroelastic stability analysis, etc.) of the developed analytical method are accurate.