Numerical Study on the Flutter Control of Plates Using Active Lumped Vortex Excitations

• Main Authors: Te Jen, 任德
• Other Authors: Li-Jeng Huang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/17973834460238763002

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 92 === Flutter is an important phenomenon of aero-elastic instability which occurs in civil and aeronautical engineering for slender elastic structures. It’s a dynamic interaction between structural dynamic deformation and unsteady aerodynamic loads. This paper presents the application of lumped vortex method to time-domain unsteady aerodynamic and aero-elastic analysis for two-degrees-of-freedom typical section model oscillating harmonically and suddenly accelerated and the numerical results are compared with those analytical solutions obtained by Wagner and Theodorsen. The computational flutter boundaries based on time-history analysis agree well with those obtained from the V-g method in frequency domain. Finally, state-feedback control of flutter was tested using different proportional gains and active lumped vortex excitation positions. The results show that fluttering plate can be effectively controlled using active lumped vortex excitation with appropriate chosen feedback gains and excitation locations. The mechanism of flutter suppression is its induced secondary unsteady aerodynamic loads effectively alleviate the structural motions induced primary flow fields through the Biot-Savart law and the satisfaction of Kelvin condition.