...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the American Helicopter Society >Comparison of Comprehensive Analyses Predicting Whirl Flutter Stability of the Wing and Rotor Aeroelastic Test System
【24h】

Comparison of Comprehensive Analyses Predicting Whirl Flutter Stability of the Wing and Rotor Aeroelastic Test System

机译：机翼和转子气动弹性测试系统旋转颤振稳定性的综合分析比较

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Whirl flutter stability is a critical limitation for tiltrotor aircraft. This paper investigates whirl flutter predictions for the Wing and Rotor Aeroelastic Test System (WRATS) using comprehensive analysis, focusing on the comparison of the whirl flutter stability predictions between Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics (CAMRAD) II and the Rotorcraft Comprehensive Analysis System (RCAS). The analytical models were created using a modular approach to systematically validate the modeling process of the WRATS tiltrotor. Comparison of nonrotating frequencies for blade, flexbeam, flexbeam and cuff, and blade with flexbeam and cuff shows excellent agreement between CAMRAD II and RCAS. The assembled model is then used to predict the whirl flutter stability boundary for various configurations with varying levels of fidelity. Results show near exact agreement between the two analyses for a rigid rotor and linear aerodynamics, and good to fair agreement when an elastic rotor is used. Predicted wing beam mode frequencies and damping values are also compared against the wind tunnel test data, and the frequencies are shown to be reasonably well-predicted. However, damping values, and thus stability boundaries, are not accurately predicted.
机译：旋翼稳定性是摆式旋翼飞机的关键限制。本文采用综合分析方法对机翼和旋翼气动弹性测试系统（WRATS）的旋振颤振预测进行了研究，重点是对旋翼航空器动力学和动力学综合分析模型（CAMRAD）II与旋翼机综合分析系统之间的旋振颤振稳定性预测进行比较（RCAS）。使用模块化方法创建了分析模型，以系统地验证WRATS倾斜转子的建模过程。叶片，弹性梁，弹性梁和袖带以及具有弹性梁和袖带的叶片的非旋转频率的比较表明，CAMRAD II和RCAS之间具有极好的一致性。然后，将组装后的模型用于预测具有不同保真度级别的各种配置的旋转颤动稳定性边界。结果表明，对于刚性转子和线性空气动力学而言，这两种分析之间几乎完全吻合，并且当使用弹性转子时，吻合良好。还将预测的机翼束模式频率和阻尼值与风洞测试数据进行了比较，并且这些频率显示出合理的预测。但是，阻尼值以及稳定性边界均无法准确预测。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号