{"id":3678,"date":"2020-10-06T10:54:09","date_gmt":"2020-10-06T10:54:09","guid":{"rendered":"https:\/\/www.editage.com\/insights\/safe-flights-new-study-detects-onset-of-destructive-oscillations-in-aircraft-turbines\/"},"modified":"2025-01-15T06:26:23","modified_gmt":"2025-01-15T06:26:23","slug":"safe-flights-new-study-detects-onset-of-destructive-oscillations-in-aircraft-turbines","status":"publish","type":"post","link":"https:\/\/www.editage.com\/insights\/safe-flights-new-study-detects-onset-of-destructive-oscillations-in-aircraft-turbines","title":{"rendered":"Safe flights: New study detects onset of destructive oscillations in aircraft turbines"},"content":{"rendered":"

Despite humanity\u2019s remarkable engineering prowess, sometimes completely unexpected or poorly understood physical phenomena can rapidly lead to catastrophic failures. Such was the case in Braniff International Airways Flight 542 in 1959 and Northwest Orient Airlines Flight 710 in 1960, where both aircrafts spontaneously disintegrated in mid-air due to a mechanical phenomenon known as \u201cflutter.\u201d<\/span><\/span><\/span><\/span><\/p>\n

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In aerospace research, flutter generally refers to undesired and self-sustained vibrations in turbine blades that can readily grow out of control, destroying them along with the engine, and even the aircraft\u2019s wings. It is not very surprising that flutter remains an area of active research and one of the main concerns when designing turbines. In fact, flutter has been placed once again under the spotlight in a project (advanced-fan-jet-research: aFJR) launched by the Japan Aerospace Exploration Agency (JAXA) aimed at designing highly efficient and environment-friendly turbines.<\/span><\/span><\/span><\/span><\/p>\n

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In a new study published in Physical Review Applied<\/i><\/span><\/a><\/span><\/span><\/span>, scientists from the Tokyo University of Science (TUS), in collaboration with researchers from JAXA, tackle the problem of developing a novel methodology for early detection of flutter in the design state of blades. Dr. Hiroshi Gotoda (corresponding author of the paper) from the Department of Mechanical Engineering at TUS explains the problem at hand and how they tried to solve it, \u201cThe onset of cascade flutter has impeded the technological development of advanced jet engines and its early detection is a long-standing problem in current aerospace propulsion engineering. Our main aim was to explore the applicability of a methodology combining complex networks and synchronization to detect a precursor of cascade flutter<\/i>.\u201d <\/span><\/span><\/span><\/span><\/p>\n

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The main idea behind their approach is that the turbine fan can be mathematically modeled as a complex network of interrelated oscillators and that flutter is ultimately the result of the progressive synchronization of more and more blades as a result of increased airflow going through the turbine. In another study, published in the Journal of Applied Physics<\/i><\/a><\/span><\/span>, the same group had explored an artificial intelligence-based method for detecting the onset of flutter from time-series data using the permutation entropy of the system, which is a measure of the randomness of the turbine\u2019s complex dynamics. In their current work, they demonstrate that a network representation of the system based on synchronization is closely related to the actual oscillatory behavior of the blades.<\/span><\/span><\/span><\/span><\/p>\n

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Through experiments on an actual turbine test rig conducted at JAXA\u2019s Altitude Test Facility, the research team found that, before the onset of flutter, one particular blade begins to act as a \u201ccentral hub\u201d in the network and adjacent blades start to oscillate in sync with it. This \u201clocal\u201d synchronization quickly expands and leads to the collective synchronization of all blades, resulting in potentially catastrophic \u201cflutter.\u201d <\/span><\/span><\/span><\/span><\/p>\n

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In this context, the network representation of the system proposed in this study serves two important purposes, as explained by Dr. Gotoda, \u201cWe demonstrate the applicability of two local and global measures as potential detectors of cascade flutter: the connecting strength between individual network nodes and the network\u2019s synchronization parameter. The former is valid for specifying the dominant blades for the onset of cascade flutter. In contrast, the latter, which ranges from 0 to 1, is more suitable for determining a threshold for this onset.<\/i>\u201d<\/span><\/span><\/span><\/span><\/p>\n

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The combined findings of these new studies shed light on the complex phenomenon of flutter, and contribute to the academic systemization of nonlinear problems in the field of aeronautical engineering and related nonlinear science. They could represent promising techniques for the early detection of flutter onset in the design state of blades. The efforts of this research team from TUS and JAXA would help the development of safer and more eco-friendly turbine designs.<\/span><\/span><\/span><\/span><\/p>\n

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Reference<\/span><\/b><\/span><\/span><\/p>\n

Titles of original papers:
(1) Early Detection of Cascade Flutter in a Model Aircraft Turbine Using a Methodology Combining Complex Networks and Synchronization<\/span><\/span><\/span><\/span><\/p>\n

(2) Experimental study on early detection of cascade flutter in turbo jet fans using combined methodology of symbolic dynamics, dynamical systems theory, and machine learning<\/span><\/span><\/span><\/span><\/span><\/p>\n

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Journals:<\/span><\/span><\/span><\/span><\/span><\/p>\n

(1) Physical Review Applied<\/i><\/span><\/span><\/span><\/span><\/span><\/p>\n

(2) Journal of Applied Physics<\/i> <\/span><\/span><\/span><\/span><\/span><\/p>\n

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DOI:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><\/span><\/span><\/p>\n

(1)<\/span><\/span> 10.1103\/PhysRevApplied.14.014093<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

(2) 10.1063\/1.5143373<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

About t<\/b>he Tokyo University of Science<\/b><\/span><\/span><\/span><\/p>\n

Tokyo University of Science (TUS) is a well-known and respected university, and the largest science-specialized private research university in Japan, with four campuses in central Tokyo and its suburbs and in Hokkaido. Established in 1881, the university has continually contributed to Japan’s development in science through inculcating the love for science in researchers, technicians, and educators. \u00a0<\/span><\/span><\/span><\/span><\/p>\n

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With a mission of \u201cCreating science and technology for the harmonious development of nature, human beings, and society”, TUS has undertaken a wide range of research from basic to applied science. TUS has embraced a multidisciplinary approach to research and undertaken intensive study in some of today’s most vital fields. TUS is a meritocracy where the best in science is recognized and nurtured. It is the only private university in Japan that has produced a Nobel Prize winner and the only private university in Asia to produce Nobel Prize winners within the natural sciences field. <\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

Website: https:\/\/www.tus.ac.jp\/en\/mediarelations\/<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

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About Associate Professor Hiroshi Gotoda from Tokyo University of Science<\/b><\/span><\/span><\/span><\/p>\n

Hiroshi Gotoda graduated in Mechanical Engineering from Keio University, Japan, in 1998 and received a PhD from there as well in 2003. He has been with Tokyo University of Science since 2015, where he works as Associate Professor in the Department of Mechanical Engineering and leads his own lab. His main research interests are combustion, fluid dynamics, and nonlinear physics. He has published over 54 refereed international papers and received awards from the Combustion Society of Japan, Keio University, and Japan\u2019s Ministry of Education, Culture, Sports, Science and Technology.<\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/p>\n

Media contact <\/span><\/b><\/span><\/span><\/p>\n

Tsutomu Shimizu <\/span><\/span><\/span><\/span><\/p>\n

Email: mediaoffice@admin.tus.ac.j<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Despite humanity\u2019s remarkable engineering prowess, sometimes completely unexpected or poorly understood physical phenomena can rapidly lead to catastrophic failures. Such was the case in Braniff International Airways Flight 542 in 1959 and Northwest Orient Airlines Flight 710 in 1960, where both aircrafts spontaneously disintegrated in mid-air due to a mechanical phenomenon known as \u201cflutter.\u201d \u00a0 […]<\/p>\n","protected":false},"author":1152,"featured_media":33313,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2435],"tags":[2482],"new_categories":[],"new_tags":[],"series":[],"class_list":["post-3678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trending-research","tag-science-update"],"acf":[],"yoast_head":"\nSafe flights: New study detects onset of destructive oscillations in aircraft turbines | Editage Insights<\/title>\n<meta name=\"description\" content=\"New study by researchers at Tokyo University of Science detects onset of destructive 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