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Rotor Aeroelastic Stability Analysis Using Coupled Computational Fluid Dynamics/Computational Structural Dynamics

机译：耦合计算流体动力学/计算结构动力学的转子气弹稳定性分析

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摘要

Computational fluid dynamics/computational structural dynamics (CFD/CSD) coupling was successfully applied to the rotor aeroelastic stability problem to calculate lead-lag regressing mode damping of a hingeless rotor in hover and forward flight. A direct time domain numerical integration of the equations in response to suitable excitation was solved using a tight CFD/CSD coupling. Two different excitation methods-swashplate cyclic pitch and blade tip lead-lag force excitations-were investigated to provide suitable blade transient responses. The free decay transient response time histories were postprocessed using the moving-block method to determine the damping as a function of the rotor operating conditions. Coupled CFD/CSD analysis results are compared with the experimentally measured stability data obtained for a 7.5-ft-diameter Mach-scale hingeless rotor model as well as stability predictions using the comprehensive analysis Rotorcraft Comprehensive Analysis System (RCAS). The coupled CFD/CSD predictions agreed more closely with the experimental lead-lag damping measurements than RCAS predictions based on conventional aerodynamic methods, better capturing key features in the damping trends.
机译：计算流体动力学/计算结构动力学（CFD / CSD）耦合已成功地应用于转子气动弹性稳定性问题，以计算无铰链转子在悬停和向前飞行中的超前-滞后回归模式阻尼。使用紧密的CFD / CSD耦合解决了方程式在适当激励下的直接时域数值积分。为了提供合适的叶片瞬态响应，研究了两种不同的励磁方法：斜盘循环节距和叶片尖端超前-滞后力励磁。使用动块法对自由衰减瞬态响应时间历史进行了后处理，以确定阻尼与转子运行条件的关系。耦合的CFD / CSD分析结果与使用7.5英尺直径马赫规模无铰链转子模型的实验测得的稳定性数据进行了比较，并使用了旋翼飞机综合分析系统（RCAS）进行了稳定性预测。与基于传统空气动力学方法的RCAS预测相比，CFD / CSD耦合预测与试验提前-滞后阻尼测量更加吻合，可以更好地捕捉阻尼趋势中的关键特征。

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  • 来源
    《Journal of the American Helicopter Society》 |2011年第4期|p.042003.1-042003.16|共16页
  • 作者

    Hyeonsoo Yeo; Mark Potsdam; Robert A. Ormiston;

  • 作者单位

    Aeroflightdynamics Directorate (AMRDEC), U.S. Army Research, Development, and Engineering Command, Ames Research Center, Moffett Field, CA;

    Aeroflightdynamics Directorate (AMRDEC), U.S. Army Research, Development, and Engineering Command, Ames Research Center, Moffett Field, CA;

    Aeroflightdynamics Directorate (AMRDEC), U.S. Army Research, Development, and Engineering Command, Ames Research Center, Moffett Field, CA;

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