{"id":18932,"date":"2025-02-14T11:34:08","date_gmt":"2025-02-14T11:34:08","guid":{"rendered":"https:\/\/aerospacerepository.org\/?p=18932"},"modified":"2025-02-14T11:34:09","modified_gmt":"2025-02-14T11:34:09","slug":"operational-modal-analysis-for-simulated-flight-flutter-test-of-an-unconventional-aircraft","status":"publish","type":"post","link":"https:\/\/aerospacerepository.org\/index.php\/2025\/02\/14\/operational-modal-analysis-for-simulated-flight-flutter-test-of-an-unconventional-aircraft\/","title":{"rendered":"OPERATIONAL MODAL ANALYSIS FOR SIMULATED FLIGHT FLUTTER TEST OF AN UNCONVENTIONAL AIRCRAFT"},"content":{"rendered":"\n<p><strong>Ozge Suelozgen, Matthias Wustenhagen<\/strong><\/p>\n\n\n\n<p><strong>DOI Number: N\/A<\/strong><\/p>\n\n\n\n<p><strong>Conference number: IFASD-2019-081<\/strong><\/p>\n\n\n\n<p>The framework of this research paper concerns a phenomenon called \u201d\ufb02utter\u201d which is a well-known dynamic aeroelastic instability caused by an interaction between structural vibrations and unsteady aerodynamic forces, whereby the level of vibration may trigger large amplitudes, eventually leading to catastrophic failure of the aircraft within a couple of seconds. Flutter prediction and \ufb02utter clearance are major issues in the design, development and certi\ufb01cation process of an aircraft. Hence, it is mandatory for certi\ufb01cation to guarantee that the aircraft is free from \ufb02utter throughout the entire \ufb02ight envelope. Within the framework of the FLEXOP (Flutter Free FLight Envelope eXpansion for ecOnomic Performance improvement) project, an output-only operational modal parameter estimation algorithm in frequency domain has been implemented for monitoring the evolution of the aeroelastic modes for the nearly real-time surveillance of \ufb02utter. Therefore an integrated aeroelastic simulation model for the FLEXOP aircraft has been generated. This paper primarily addresses the application of the frequency-domain output-only Operational Modal Analysis (OMA) method during the simulated \ufb02ight \ufb02utter test of the FLEXOP aircraft. An automatically running modal parameter estimation method called PolyMax will be introduced, which needs the measured responses of the aircraft preprocessed into output spectra. The output-only OMA requires non-deterministic natural and\/or operational excitations which are provided by atmospheric turbulence excitation and\/or pilot control inputs. In addition, a straightforward robust \ufb02utter analysis method in frequency-domain called \u00b5-V method is presented. Robust \ufb02utter analysis deals with aeroelastic (or aeroservoelastic) stability analysis taking structural dynamics, aerodynamics and\/or unmodeled system dynamics uncertainties into account [1]. The primary motivation of the robust \ufb02utter analysis is that this method allows the computation of the worst-case \ufb02utter velocity which can support the \ufb02ight test program by a valuable robust \ufb02utter boundary.<\/p>\n\n\n\n<p><a href=\"https:\/\/aerospacerepository.org\/wp-content\/uploads\/2025\/02\/IFASD-2019-081.pdf\">Read the full paper here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Ozge Suelozgen, Matthias Wustenhagen<\/b><\/p>\n<p>DOI Number: N\/A<\/p>\n<p>Conference number: IFASD-2019-081<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2446,2433],"tags":[1972,2918,2235,2048,2919,2021],"class_list":["post-18932","post","type-post","status-publish","format-standard","hentry","category-flight-testing","category-1-ifasd-2019","tag-aeroelasticity","tag-ight-test","tag-utter","tag-operational-modal-analysis","tag-robust-utter-analysis","tag-structural-dynamics","category-2446","category-2433","description-off"],"_links":{"self":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/18932","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=18932"}],"version-history":[{"count":1,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/18932\/revisions"}],"predecessor-version":[{"id":18934,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/posts\/18932\/revisions\/18934"}],"wp:attachment":[{"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/media?parent=18932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/categories?post=18932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aerospacerepository.org\/index.php\/wp-json\/wp\/v2\/tags?post=18932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}