A novel swashplateless rotor design featuring blades, paddles and PZT-actuated aileron is being investigated. The aileron, located behind the paddle trailing edge, controls the paddle pitch motion. In the present study, the paddle and aileron are situated 90 deg forward of azimuth with respect to the blade. A mechanical linkage couples the blade pitch and paddle flap motions. A quasi-steady four degree-of-freedom analytical model has been developed to study the dynamic behavior of the system. Theodorsen's theory is used to compute the aerodynamic components. Preliminary trade studies have been performed using the analysis with quasi-steady aerodynamics, to investigate the effect of paddle span, paddle radial location and paddle mass. These results indicate that the paddle mass should be lowered in relation to its area. Future work will involve further refinement of the model including unsteady aerodynamic effects using non-circulatory terms and Theodorsens function. A piezoceramic actuation mechanism will be selected, and experimental testing will be performed on a model that is currently under construction, to validate the analysis. The validated analysis will then be used to perform a detailed design study to identify an optimum set of parameters to maximize the control authority of the aileron. Several other factors, such as overall mass, rotor figure of merit, power consumption will be investigated in order to assess the feasibility of the system.
Analysis of a swashplateless helicopter rotor with active servopaddles
Untersuchung eines Hubschrauberrotors ohne Taumelscheibe mit aktiven Servorudern
2009
9 Seiten, 11 Bilder, 1 Tabelle, 30 Quellen
Conference paper
English
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