Bookmark Kaumudi Online  Bookmark this site  Editor@Kaumudi  |  Marketing  Print Advt rates  |  Calendar 2018        Go!    
 
 
May 24, Thursday 2018 6:09 AM       

       HEADLINES: Actor Vijayan Peringode dies                                              Efforts to resolve church dispute will continue, says Patriarch Bava                                              All party meet on May 25 in Kozhikode                                              Don't fall prey to Nipah-related rumours: Governor                                              Nipah virus outbreak: Suspended Gorakhpur doctor offers help                                              BJP MP Bandaru Dattatreya's son dies of heart attack                                              Kamal Haasan demands Sterlite industry to be shut                                              H D Kumaraswamy swears in as K'taka CM                                              Four Nepali woman journalists scale Mount Everest                                              Trump-Kim meeting set to take place on June 12: Pompeo                                              Corruption cases result of high treason case instituted against Musharraf: Sharif                                              Ode to ABD: When 360 degree was not geometry but joy                                              AFI names 51-member team for Asian Junior Athletics                                              'Tired' AB De Villiers retires from international cricket                                              Kaumudi Facebook
       WEIRDNEWS Next Article: 'Honest' thieves return booty with a piece of advice  
       Owl feathers may inspire quieter aircraft, turbines
 
         Posted on :19:07:12 Sep 28, 2017
   
A A
       Last edited on:19:07:12 Sep 28, 2017
         Tags: Owl feathers may inspire quieter aircraft, tu
 
WASHINGTON: Owl wings may inspire the next generation of wind turbines, specialised aircraft and autonomous drones with minimum noise footprint, scientists say.
 
Many species of owl are able to hunt without being heard by their prey by suppressing the noise of their wings at sound frequencies above 1.6 kilohertz (kHz) - including the range at which human hearing is most sensitive.
 
Owl wing porosity (the quality that allows air to pass resistively through the wings) helps in suppressing noise.
 
Numerous aero-acoustic studies have examined the effect of wing porosity, inspired by the quiet plumage features of owls.
 
However, much less is known about how wing porosity affects the aerodynamics of these wings, which likely competes with the acoustic benefits of porosity.
 
Now, researchers at Lehigh University in the US have formulated and solved for exactly the aerodynamic loads on an airfoil, or two dimensional (2D) wing-like structure.
 
Their mathematical formula uses arbitrary realistic porosity distributions, which may be used in conjunction with an aero-acoustic theory, to determine the aerodynamic trade- off of porous wing designs.
 
The work, published in the journal Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, could ultimately be used to improve man-made aerodynamic design of wind turbines and specialised aircraft or autonomous drones, researchers said.
 
"Exploratory experimental work by other researchers has measured the noise and aerodynamics of airfoils constructed from various porous materials over a range of flow speeds," said Justin W Jaworski, assistant professor at Lehigh University.
 
"Our work generalises the existing theory to yield results for arbitrary porosity distributions along the airfoil and produces a porosity parameter that collapses all of the experimental data onto a single curve," said Jaworski.
 
"Our general result has the potential to be integrated into the aerodynamic/aero-acoustic design of the wings and blades of small air vehicles, wind turbines, or drones seeking to minimise their noise footprint through passive means," he said.
A A
       WEIRDNEWS
Next Article: 'Honest' thieves return booty with a piece of advice
 
 
WEIRDNEWS HEADLINES
Sexual intimacy in late years does not slow memory loss  
Twitterati goes berserk over Kanye West's new 'poop' song  
Ajinomoto helps improve Thailand's food industry  
Man bites off brother's nose after denied money for alcohol  
Alive man in Uttar Pradesh declared 'dead' on paper  
UP: Man's severed foot kept between his legs in Sultanpur hospital  
Gender: Female; Name: Miss Unwanted  
UP: Man performs last rites for his pet parrot  
Madhya Pradesh: Dead man came alive  
Delhi college students protest after semen-filled balloons thrown at girls  
Drunk man survives after biting and killing snake  
MLAs fear spirits haunting Rajasthan Assembly, demand 'yagya'  
Couple gets grandchildren via surrogacy  
Divorce petition filed against dog, goat marriage  
TN: Priests suspended for decorating idol in 'salwar kameez'  
80-year-old woman raped in Pune  
Doctor commits suicide after wife denies him non-veg food  
Modern-day Mowgli: Village boy forges bond with gang of monkeys  
263 coins, shaving blades and needles removed from man's stomach in MP  
Man claims sexual stimulation cleared his sinus  
Turns out, women are fussed about face fuzz  
A Mumbai man's love story with his iPhone X  
Mom who beat girl for incorrect Bible verses gets prison  
Bipasha Basu turns down offer to endorse aerated drink!  
Vampires may have been real people with a blood disorder  
 
Will GST help decrease the petrol price?
yes
 
no
 
don't know
 
 
 
Home Kerala India World Business Sports Sci&Tech Education Automobile CityNews Movies Environment Letters 
© Copyright keralakaumudi Online 2011  |  Reproduction in whole or in part without written permission is prohibited.
Head Office Address: Kaumudi Buildings, Pettah P.O, Trivandrum - 695024, India.
Online queries talk to Deepu Sasidharan, + 91 98472 38959 or Email deepu[at]kaumudi.com
Customer Service -Advertisement Disclaimer Statement   |  Copyright Policy