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首页> 美国政府科技报告 >Toward Comparing Experiment and Theory for Corroborative Research on Hingeless Rotor Stability in Forward Flight (An Experimental and Analytical Investigation of Isolated Rotor-Flap-Lag Stability in Forward Flight).
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Toward Comparing Experiment and Theory for Corroborative Research on Hingeless Rotor Stability in Forward Flight (An Experimental and Analytical Investigation of Isolated Rotor-Flap-Lag Stability in Forward Flight).

机译：作者：张莹莹，李。，李。，李。，航空动力学报JOURNaL OF aEROspaCE pOWER前飞行中无铰链转子稳定性的对比试验与理论研究（前向飞行滞后稳定中孤立转子襟翼的实验与分析研究）。

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For flap-lag stability of isolated rotors, experimental and analytical investigations are conducted in hover and forward flight on the adequacy of a linear quasisteady aerodynamics theory with dynamic inflow. Forward flight effects on lag regressing mode are emphasized. Accordingly, a soft inplane hingeless rotor with three blades is tested at advance ratios as high as 0.55 and at shaft angles as high as 20 degrees. The 1.62 m model rotor is untrimmed with an essentially unrestricted tilt of the tip path plane. In combination with lag natural frequencies, collective pitch settings and flap-lag coupling parameters, the data base comprises nearly 1200 test points (damping and frequency) in forward flight and 200 test points in hover. By computerized symbolic manipulation, a linear analytical model is developed in substall to predict stability margins with mode identificaton. To help explain the correlation between theory and data it also predicts substall and stall regions of the rotor disk from equilibrium values. The correlation shows both the strengthts and weaknesses of the theory in substall.

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