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Drivetrain influence on the lead-lag modes of hingeless helicopter rotors

机译：传动系统对无铰链直升机旋翼超前滞后模式的影响

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摘要

Structural couplings between the flexible main rotor and the flexible drivetrain of the Bo 105 helicopter are investigated by numerical simulation. For this purpose, the rotor hub constraint Ω = const, is dropped and a drivetrain model, consisting of discrete inertia elements and intermediate flexible elements, is connected to the hub. By use of the multibody-software SIMPACK, the coupled rotor-drivetrain system is linearized and the eigenmodes are compared to those obtained with a constrained rotor hub. The drivetrain has a significant influence on the shapes and eigenfrequencies of the collective lead—lag modes. While the first collective lead-lag eigenfrequency is raised by the finite drivetrain inertia, the second is lowered due to drivetrain flexibility. To assess the influence of modeling inaccuracies on the observed couplings, the study is complemented by a sensitivity analysis. Rotor blade mass axis offset, blade pitch (causing elastic coupling) and blade precone angle have only weak influence on the coupled modes. In contrast, variations of drivetrain inertia and stiffness strongly affect the eigenfrequencies of the coupled rotor-drivetrain modes.
机译：通过数值模拟研究了Bo 105直升机柔性主旋翼与柔性传动系统之间的结构耦合。为此，降低了转子轮毂约束Ω= const，并将由离散惯性元素和中间柔性元素组成的动力传动系统模型连接到轮毂。通过使用多体软件SIMPACK，可将耦合的转子-传动系统线性化，并将本征模与约束转子轮毂获得的本征模进行比较。传动系统对总超前-滞后模式的形状和本征频率有重大影响。虽然第一个总的超前滞后本征频率通过有限的动力总成惯性来提高，但是第二个由于驱动力的灵活性而降低了。为了评估建模误差对观察到的耦合的影响，本研究辅以敏感性分析。转子叶片质量轴偏移，叶片节距（导致弹性耦合）和叶片前锥角对耦合模式的影响很小。相反，动力传动系统惯性和刚度的变化强烈影响耦合的转子动力传动系统模式的本征频率。

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