{"id":48,"date":"2012-02-20T14:46:00","date_gmt":"2012-02-20T20:46:00","guid":{"rendered":"http:\/\/charles-oneill.com\/blog\/?p=48"},"modified":"2014-07-31T11:17:20","modified_gmt":"2014-07-31T16:17:20","slug":"project-review-airfoil-aerodynamics-system-identification","status":"publish","type":"post","link":"https:\/\/charles-oneill.com\/blog\/project-review-airfoil-aerodynamics-system-identification\/","title":{"rendered":"Project Review: Airfoil Aerodynamics System Identification"},"content":{"rendered":"
Aerodynamic System Identi\ufb01cation<\/div>\n
Charles O’Neill<\/div>\n
December 2004<\/div>\n

This project investigates aerodynamic system identi\ufb01cation. An airfoil produces time varying loads based on the current and past boundary conditions; this project seeks to identify the lift loads resulting from pitch motion.
The \ufb01rst part discusses some unsteady aerodynamic theory. The second part discusses the identi\ufb01cation process. The \ufb01nal part discusses conclusions and observations.<\/p>\n

A Box-Jenkins model successfully modeled the lowand moderate airfoil reduced frequencies, but was  troublesome at higher frequencies. Interestingly, the Theodorsen theory qualitatively matches the CFD results except above approximately a reduced frequency of unity. The moderate frequency lift de\ufb01ciency predicted by Theodorsen was found in the CFD solution and the Box-Jenkins model. Interestingly, as the high frequencies were resolved, the system appears more distributed. The \ufb01nal Box-Jenkins model accurately predicted the forces resulting from a validation input signal.<\/p>\n\n\n\n\n
<\/a><\/td>\n<\/tr>\n
Bode Frequency Response of Data and Box-Jenkins Model<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The project document is at sifinal.pdf<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Aerodynamic System Identi\ufb01cation Charles O’Neill December 2004 This project investigates aerodynamic system identi\ufb01cation. An airfoil produces time varying loads based on the current and past boundary conditions; this project seeks to identify the lift loads resulting from pitch motion.The \ufb01rst part discusses some unsteady aerodynamic theory. The second part discusses the identi\ufb01cation process. The \ufb01nal part discusses conclusions […]<\/p>\n","protected":false},"author":1,"featured_media":72,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/posts\/48"}],"collection":[{"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/comments?post=48"}],"version-history":[{"count":0,"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/posts\/48\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/media\/72"}],"wp:attachment":[{"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/media?parent=48"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/categories?post=48"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/charles-oneill.com\/blog\/wp-json\/wp\/v2\/tags?post=48"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}