Study on Mechanism of Silent Flight of Owls
Abstract: The silent flight of owls has long fascinated ornithologists, acoustic specialists, and even military experts; no other birds fly with such distinct advantages. In this work, the flight noise of a bubo bubo (a kind of large owl) was recorded, and followed by a comprehensive study on the mechanism of the silent flight, including research on the wing profile and its aerodynamic performance and acoustic property, the morphology of the feathers and its mechanical characteristics, as well as the microscopic structure of the skin and its sound absorption performance. It is concluded that the unique ability of silent flight of owls attributes to the combination of multiple noise reduction factors, sorted as sound suppression and sound absorption, which has piqued the interest of biomimetic research for noise control.
文章引用: 孔德义 , 梁爱萍 , 褚金奎 , 梅涛 (2015) 猫头鹰的静音飞行机理研究。 应用物理， 5， 137-146. doi: 10.12677/APP.2015.511019
 Mascha, E. (1904) Uber die Schwungfedern. Zeitschrift fur wissenschaftliche Zoologie, 77, 606-651.
 Graham, R.R. (1934) The Silent Fight of Owls. Journal of the Royal Aeronautical Society, 286, 837-843.
Lilley, G. (1998) A Study of the Silent Flight of the Owl. 4th AIAA/CEAS Aeroacoustics Conference, Toulouse, 2-4 June 1998, 1-6.
 Bachmann, T., Mühlenbruch, G. and Wagner, H. (2011) The Barn Owl Wing: An Inspiration for Silent Flight in the Aviation Industry. SPIE, 7975, 1-14.
 Geyer, T., Sarradj, E. and Fritzsche., C. (2009) Silent Owl Fight: Experiments in the Aeroacoustic Wind Tunnel. Jahrestagung fur Akustik (DAGA 2009), 734-736.
 Klän, S. (2011) Experimental Analysis of the Flow Over an Owl-Based Wing Geometry. Berichte aus der Strömung- stechnik. Shaker Verlag GmbH.
 Geyer, T., Sarradj, E. and Fritzsche, C. (2013) Silent Owl Flight: Comparative Acoustic Wind Tunnel Measurements on Prepared Wings. Acta Acustica united with Acustica, 99, 139-153.
 Jafar, M., Mustafa, S. and Thimantha, U. (2013) Experimental Study of Aerodynamic Noise from the Trailing Edge and Leading Edge of Blades in a Coaxial-Double Shaft Fan. ASME 2013 Fluids Engineering Division Summer Meeting, Incline Village, 7-11 July 2013, 1-7.
Justin, W. and Peake, N. (2013) Aerodynamic Noise from a Poroelastic Edge with Implications for the Silent Flight of Owls. Journal of Fluid Mechanics, 723, 456-479.
Gao, J. (2013) Structure and Mechanical Property of Asio otus Feather Barbs. Key Engineering Materials, 562-565, 914-919.
 孙少明. 长耳鸮皮肤和覆羽耦合吸声降噪特性研究[J]. 噪声与振动控制, 2008, 28(3): 119-123.