{"id":19081,"date":"2025-02-17T11:29:18","date_gmt":"2025-02-17T11:29:18","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=19081"},"modified":"2025-02-17T11:29:19","modified_gmt":"2025-02-17T11:29:19","slug":"wing-design-for-wind-tunnel-flutter-testing","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2025\/02\/17\/wing-design-for-wind-tunnel-flutter-testing\/","title":{"rendered":"WING DESIGN FOR WIND TUNNEL FLUTTER TESTING"},"content":{"rendered":"\n<p><strong>Ulf Ringertz<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: IFASD-2019-140<\/strong><\/p>\n\n\n\n<p>The design, analysis and structural testing of a new wing for a \ufb02utter wind tunnel model is considered. The aircraft con\ufb01guration represents a modern light weight \ufb01ghter con\ufb01guration with external stores. A \ufb01rst test in the Transonic Dynamics Tunnel (TDT) at NASA Langley was performed in 2016 and the upcoming second test is planned for 2020. During the \ufb01rst test program, a large amount of static aeroelastic data was acquired both in air and heavy gas (R134a) and also some dynamic data. Flutter testing was also performed but only two \ufb02utter conditions were achieved before model damage. For the second test, a new wing structural design is being developed in order to allow \ufb02utter testing also without under-wing external stores and without signi\ufb01cant mass balancing. However, in order to maintain suf\ufb01cient structural strength, design optimization is required. The new design is to maintain the same strength as the \ufb01rst design tested but with much lower \ufb02utter dynamic pressure in transonic conditions. The strength requirements are considered using structural testing in combination with linear elastic \ufb01nite element analysis. The design process has demonstrated that changing the composite layup will have a very signi\ufb01cant in\ufb02uence on the predicted \ufb02utter dynamic pressure without loss of strength. By using a mix of glass-\ufb01ber weave with a few layers of uni-directional glass-\ufb01ber and tailoring of the \ufb01ber orientation, a suf\ufb01ciently large reduction in \ufb02utter dynamic pressure can be obtained.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2025\/02\/IFASD-2019-140.pdf\">Read the full paper here<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Ulf Ringertz<\/b><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: IFASD-2019-140<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2433,2457],"tags":[1972,2235,683,632],"class_list":["post-19081","post","type-post","status-publish","format-standard","hentry","category-1-ifasd-2019","category-wind-tunnel-testing","tag-aeroelasticity","tag-utter","tag-transonic","tag-wind-tunnel","category-2433","category-2457","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/19081","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=19081"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/19081\/revisions"}],"predecessor-version":[{"id":19083,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/19081\/revisions\/19083"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=19081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=19081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=19081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}