{"id":17879,"date":"2024-08-16T08:38:38","date_gmt":"2024-08-16T08:38:38","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=17879"},"modified":"2024-08-16T08:38:39","modified_gmt":"2024-08-16T08:38:39","slug":"assessment-of-advanced-flutter-flight-test-techniques-and-flutter-boundary-prediction-methods","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2024\/08\/16\/assessment-of-advanced-flutter-flight-test-techniques-and-flutter-boundary-prediction-methods\/","title":{"rendered":"ASSESSMENT OF ADVANCED FLUTTER FLIGHT TEST TECHNIQUES AND FLUTTER BOUNDARY PREDICTION METHODS"},"content":{"rendered":"\n<p><strong>Maj. Michael Iovnovich, Lt. Tzlil Nahom, Lt. Michael Presman, Lt. Dorin Avsaid, Maj. Tomer Braier, Daniella E. Raveh<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: IFASD-2017-097<\/strong><\/p>\n\n\n\n<p>The paper presents an experimental study, conducted at the Israeli Air Force, aimed at the assessment of several advanced \ufb02utter \ufb02ight test techniques that are designed to improve the ef\ufb01ciency and accuracy of \ufb02utter tests. These include the auto-regresive moving-avarage (ARMA) and operational modal analysis (OMA) system identi\ufb01cation methods, the use of various system stability parameters, and the use of atmospheric turbulence versus prescribed \ufb02aperon motion as the source of structural response excitation. The methods were evaluated based on data from a dedicated transonic \ufb02ight test of the F-16 platform. All of the tested methods were able to accurately predict the instability onset. The OMA method has the advantage that it does not require a priori knowledge of the instability mechanism (participating modes and approximate \ufb02utter frequency). However, it requires delicate identi\ufb01cation of the participating modes, thus making it less suitable for real time processing. The ARMA method, on the other hand, is easier to implement, and straight forward to use in real time. Both methods require relatively large data records, of about 60 seconds at each test point. Excitation by atmospheric turbulence was found to be adequate in the current test case, in which the modes are lightly damped, and highly suitable for system identi\ufb01cation methods that rely on stochastic inputs. While further assessment is required for cases of highly damped modes and of \ufb02ight in low turbulence levels, the use of ARMA and OMA methods based on responses to atmospheric turbulence appears to offer an accurate and cost effective \ufb02utter testing methodology.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2024\/08\/IFASD-2017-097.pdf\">Read the full paper here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Maj. Michael Iovnovich, Lt. Tzlil Nahom, Lt. Michael Presman, Lt. Dorin Avsaid, Maj. Tomer Braier, Daniella E. Raveh<b\/><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: IFASD-2017-097<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[993,1953,1965],"tags":[2136,2135,2137,2048],"class_list":["post-17879","post","type-post","status-publish","format-standard","hentry","category-events","category-ifasd-2017","category-wind-tunnel-and-flight-testing","tag-arma","tag-experimental-methods","tag-flutter-ight-testing","tag-operational-modal-analysis","category-993","category-1953","category-1965","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/17879","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/comments?post=17879"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/17879\/revisions"}],"predecessor-version":[{"id":17881,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/17879\/revisions\/17881"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=17879"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=17879"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=17879"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}