中国物理B ›› 2019, Vol. 28 ›› Issue (7): 74703-074703.doi: 10.1088/1674-1056/28/7/074703

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Measuring the flexibility matrix of an eagle's flight feather and a method to estimate the stiffness distribution

Di Tang(唐迪), Hai Zhu(朱海), Wei Yuan(袁巍), Zhongyong Fan(范忠勇), Mingxia Lei(雷鸣霞)   

  1. 1 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
    2 High Speed Aerodynamic Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    3 Zhejiang Museum of Natural History, Hangzhou 310014, China
  • 收稿日期:2019-02-16 修回日期:2019-04-08 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Di Tang E-mail:tangdi@zjut.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 51705459) and the China Postdoctoral Science Foundation.

Measuring the flexibility matrix of an eagle's flight feather and a method to estimate the stiffness distribution

Di Tang(唐迪)1,2, Hai Zhu(朱海)1, Wei Yuan(袁巍)1, Zhongyong Fan(范忠勇)3, Mingxia Lei(雷鸣霞)3   

  1. 1 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
    2 High Speed Aerodynamic Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    3 Zhejiang Museum of Natural History, Hangzhou 310014, China
  • Received:2019-02-16 Revised:2019-04-08 Online:2019-07-05 Published:2019-07-05
  • Contact: Di Tang E-mail:tangdi@zjut.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 51705459) and the China Postdoctoral Science Foundation.

摘要:

Flight feathers stand out with extraordinary mechanical properties for flight because they are lightweight but stiff enough. Their elasticity has great effects on the aerodynamics, resulting in aeroelasticity. Our primary task is to figure out the stiffness distribution of the feather to study the aeroelastic effects. The feather shaft is simplified as a beam, and the flexibility matrix of an eagle flight feather is tested. A numerical method is proposed to estimate the stiffness distributions along the shaft length based on an optimal Broyden-Fletcher-Goldfarb-Shanno (BFGS) method with global convergence. An analysis of the compressive behavior of the shaft based on the beam model shows a good fit with experimental results. The stiffness distribution of the shaft is finally presented using a 5th order polynomial.

关键词: feather, stiffness distribution, flexibility matrix, optimal, Broyden-Fletcher-Goldfarb-Shanno (BFGS)

Abstract:

Flight feathers stand out with extraordinary mechanical properties for flight because they are lightweight but stiff enough. Their elasticity has great effects on the aerodynamics, resulting in aeroelasticity. Our primary task is to figure out the stiffness distribution of the feather to study the aeroelastic effects. The feather shaft is simplified as a beam, and the flexibility matrix of an eagle flight feather is tested. A numerical method is proposed to estimate the stiffness distributions along the shaft length based on an optimal Broyden-Fletcher-Goldfarb-Shanno (BFGS) method with global convergence. An analysis of the compressive behavior of the shaft based on the beam model shows a good fit with experimental results. The stiffness distribution of the shaft is finally presented using a 5th order polynomial.

Key words: feather, stiffness distribution, flexibility matrix, optimal, Broyden-Fletcher-Goldfarb-Shanno (BFGS)

中图分类号:  (Vortex stability and breakdown)

  • 47.32.cd
47.32.Ff (Separated flows)