نوع مقاله : مروری
نویسندگان
1 دانشکده علوم و فنون نوین دانشگاه تهران
2 گروه هوافضا، دانشکده علوم و فنون نوین، دانشگاه تهران.
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Owl Aeroacoustics: Analysis of a Silent Flight
The owl is known as nature's stealth bird and is unique in terms of aeroacoustics. In the silent flight of the owls, there are two basic hypotheses follows the self-masking hypothesis and the stealth hypothesis. Therefore, we are interested to present a review article about owls Aeroacoustics. this paper is a brief overview of the research conducted with OSINT studies and visualization, how Owl Flight Silently, as well as how to model owl noise reduction mechanisms in engineering designs. Also, the aim of reviewing the unique physical characteristics of owls, Foraging Behavior, and determining how some of them have the ability to be silent with other species has been done. Then, the noise in the owls' flight is examined along with the geometric details of the wings, which are the predominant features of silent flight. In the following, the efforts to model the owl wing characteristics that cause silent flight are reviewed and summarized. Also, noise reduction technologies inspired by owl models and features are described. In general, there is a wide range of conjectures for the owl's silent flight and stealth; But so far the most valid and convincing reasons with solid arguments are the Serrated structure of the wing at the leading edge, the velvety fibers of the wings and the fringes of the trailing edge. In addition, the combination of trailing edge and leading edge serrations enables a significant reduction in overall sound pressure levels at all angles of attack, stabilizes speed fluctuations at the suction surface, and eliminates low and high-frequency sounds. It also has long velvety feathers on its wings that absorb sound frequencies. The Elongated Distal Barbules of the owl create a multi-layered porous structure that increases sound absorption.
Keywords: Aeroacoustics, Owl Flight, Aeroacoustics of Silent Owl Flight.
کلیدواژهها [English]
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