Match Point Solution for Robust Flutter Analysis in Constant-Mach Prediction |
| |
作者单位: | Institute of Vibration Engineering Nanjing University of Aeronautics and Astronautics,Institute of Vibration Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016 China,Nanjing 210016 China |
| |
基金项目: | Ph.D. Programs Foundation of Ministy of Education of China (20040287019) |
| |
摘 要: | This paper presents a method for robust flutter computation which uses flight altitude as the perturbation variable in order to obtain a match point solution. The air density and sound speed of standard atmosphere model are approximated as the polynomial function of altitude, such that the flight altitude becomes the single perturbation variable that describes the aeroelastic system. The uncertainties of generalized stiffness and damping are considered and the uncertain aeroelastic system can be formulated as linear fractional transformation (LFT) representation which is suitable for/.t analysis framework. Finally, the match point solutions of robust flutter margins can be computed with structured singular value (SSV) theory. The robust flutter analysis method provided in this paper is suitable for constant-Mach flight flutter test and provides valuable reference for flight envelope expansion.
|
关 键 词: | 飞行摆动测试 不确定性 扰动 恒定马赫数预测 |
收稿时间: | 13 November 2007 |
Match Point Solution for Robust Flutter Analysis in Constant-Mach Prediction |
| |
Authors: | Yun Han |
| |
Institution: | Institute of Vibration Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| |
Abstract: | This paper presents a method for robust flutter computation which uses flight altitude as the perturbation variable in order to obtain a match point solution. The air density and sound speed of standard atmosphere model are approximated as the polynomial function of altitude, such that the flight altitude becomes the single perturbation variable that describes the aeroelastic system. The uncertainties of generalized stiffness and damping are considered and the uncertain aeroelastic system can be formulated as linear fractional transforma- tion (LFT) representation which is suitable for μ analysis framework. Finally, the match point solutions of robust flutter margins can be computed with structured singular value (SSV) theory. The robust flutter analysis method provided in this paper is suitable for con- stant-Mach flight flutter test and provides valuable reference for flight envelope expansion. |
| |
Keywords: | robust flutter uncertainty perturbation flight flutter test |
本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录! |