Asociación Juan de la Cierva Codorníu (AJCC) is devoted to the reconstruction of a commemorative replica of the C.30 autogiro to be own in national aeronautic exhibitions. In collaboration with the association, the present project focusses on two tasks: the research on a material for the disc of the blade friction damper and the design of a model that reproduces the blade motion in the steady forward flight. A number of candidate materials proposed are ranked according a figure of merit (FoM) which balances thermo-mechanical properties with an index of performance (IoP) and cost. The technique used to weight the properties is a modification of the classical digital logic (DL) method. Mainly aluminium alloys show the optimum balance to manufacture the damper friction disc. The blade motion, simulated for the steady forward flight (auto-rotation), makes use of Euler's equations for a rotating rigid body. The main assumptions rely on small angle approximation, at Earth, an ideal 2D aerodynamics model and Coulomb's friction law for damping. The results show the two motions inherently lagged by 90º and absolute compatibility with the theoretical formulation by means of Fourier's series. Simulations are numerically run at eight different airspeeds along the C.30 range of operation. As the inertial forces become dominant over the aerodynamic forces, the amplitude of both motions asymptotically tends to zero. The results render faithfully the blade cyclic motions of the C.30 autogiro under steady forward flight when compared with experimental results. ; Ingeniería Aeroespacial (Plan 2010)
Redesign of the rotor head of the C30 autogyro
2018-10-18
Theses
Electronic Resource
English
DDC: | 629 |
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