![]() ![]() It is generated when airflow passes along the back of an airfoil, such as the wing or blades of the propeller, rotor or turbine. Moreover, Liu added, when the owl catches prey, the shape of the wings is also constantly changing, which underscores the significance of studying the wing edge configuration during owl flight. “Nocturnal owls produce about 18 decibels less noise than other birds at similar flight speeds due to their unique wing configuration,” said Xiaomin Liu, a co-author of the paper, which is published in Physics of Fluids, by AIP Publishing. Researchers from Xi’an Jiaotong University, based in Xi’an, Shaanxi, China, had good reason to take their cue from nocturnal owls. Noise-whether of the engine or aerodynamic variety-is a perpetual by-product of air travel and impels a continued review of noise mitigation at the source. The FAA has set the day-night average sound level (DNL) 65 dBA as the threshold of significant noise exposure, below which residential land uses are compatible. Suppressing noise pollution from take-off and landing is a major environmental goal in urban areas. Trailing-edge noise can be characterized as the dominant sound emitted from aeronautical and turbine engines, such as wind turbines and marine propellers, but are also prevalent in drones and automobile fans. The research focused on the concept of trailing-edge noise by using the characteristics of owl wings to inform airfoil design and significantly reduce the trailing-edge noise. 229910052782 aluminium Inorganic materials 0.A new sound-suppression study provides fresh insight for airfoil design and noise control for micro-aircraft and fluid machinery.239000005431 greenhouse gas Substances 0.000 claims abstract description 3.239000000446 fuel Substances 0.000 claims abstract description 6.Anticipated expiration legal-status Critical Status Ceased legal-status Critical Current Links Assigned to BOEING COMPANY, THE reassignment BOEING COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANAST, PETER Z., KELLEY-WICKEMEYER, ROBERT H., MCLEAN, JAMES DOUGLAS, SEIDEL, GERHARD E. Assigned to BOEING COMPANY reassignment BOEING COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANANST, PETER Z., MCLEAN, JAMES DOUGLAS, KELLEY-WICKEMEYER, ROBERT H. ![]() Assignors: ANAST, PETER Z., MCLEAN, JAMES DOUGLAS, KELLEY-WICKEMYER, ROBERT H. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US2885396P priority Critical Application filed by Boeing Co filed Critical Boeing Co Priority to PCT/US1997/019048 priority patent/WO1998017529A1/en Priority to US09/284,122 priority patent/US6293497B1/en Application granted granted Critical Publication of US6293497B1 publication Critical patent/US6293497B1/en Assigned to BOEING COMPANY, THE reassignment BOEING COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee Boeing Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Anast James Douglas McLean Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Ceased Application number US09/284,122 Inventor Robert H. Google Patents Airplane with unswept slotted cruise wing airfoilĭownload PDF Info Publication number US6293497B1 US6293497B1 US09/284,122 US28412299A US6293497B1 US 6293497 B1 US6293497 B1 US 6293497B1 US 28412299 A US28412299 A US 28412299A US 6293497 B1 US6293497 B1 US 6293497B1 Authority US United States Prior art keywords wing airplane airfoil aft fuselage Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US6293497B1 - Airplane with unswept slotted cruise wing airfoil US6293497B1 - Airplane with unswept slotted cruise wing airfoil ![]()
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