, 2014 2 Part (A), No.1 32, Eng. &Tech.Journal, Vol. 3038 Flutter Condition Estimation for 3-D Cantilever Plate Using Fully Coupled Fluid – Structure Interaction Dr.Hayder Sabah Abd Al-Amir Institute of Technology, Engineering of Technical Education / Baghdad Email:hyder286@yahoo.com Dr. Mauwafak Ali Tawfik Mechanical Engineering Department, University of Technology / Baghdad Dr.Mohammed Idris Abu-Tabikh Mechanical Engineering Department, University of Technology / Baghdad Received on: 4/5/2014 & Accepted on :6/11/2014 ABSTRACT: The aeroelastic responses and the flutter condition of 3-D flexible cantilever plate were estimated by developed fully coupled fluid-structure interaction(FSI) approach. The plate model (structure model) based on assumed mode method was then combined with unsteady panel-discrete vortex method (aerodynamic model) to build relatively simple aeroelastic model. The validity of the present method had tested through comparisons with the related published work of plates flutter prediction and with wind tunnel measurements. Time domain simulation is used to examine the dynamic aeroelastic instabilities of the system. The flutter occurrence is verified when the responses diverge. To estimate the flutter frequency, Fast Fourier Transformation (FFT) technique is used to convert the generalized coordinates responses from time domain to frequency domain. The flutter speed and flutter frequency is found for many Aluminum cantilever plates which are different in aspect ratio. The speed and frequency of the flutter are within average absolute error of about 13% and 16 % for theoretical analysis and practically respectively. Keywords: Aeroelasticity , Fluid-structure interaction, Plate flutter ﻛﺎﺑﻮﻟﯿﺔ ﻟﺼﻔﯿﺤﺔ اﻟﺮﻓﺮﻓﺔ ﺗﺨﻤﯿﻦ اﻟﻤﺎﺋﻊ اﻟﺘﺎم ﺗﺪاﺧﻞ ﺑﺎﺳﺘﺨﺪام اﻻﺑﻌﺎد ﺛﻼﺛﯿﺔ– اﻟﮭﯿﻜﻞ اﻟﺨﻼﺻﺔ ﺗﻄﻮﯾﺮ ﺑﻮاﺳﻄﺔ اﻷﺑﻌﺎد ﺛﻼﺛﯿﺔ ﻛﺎﺑﻮﻟﯿﺔ ﻟﺼﻔﯿﺤﺔ اﻟﺮﻓﺮﻓﺔ ﺣﺎﻟﺔ و اﻟﮭﻮاﺋﯿﺔ اﻟﺪﯾﻨﺎﻣﯿﻜﯿﺔ اﻻﺳﺘﺠﺎﺑﺔ ﺗﺨﻤﯿﻦ ﺗﻢ ﻟﻠﻤﺎﺋﻊ اﻟﺘﺎم ﺗﺪاﺧﻞ اﺳﻠﻮب– اﻟﮭﯿﻜﻞ. اﻟﺼﻔﯿﺤﺔ ﻧﻤﻮذج رﺑﻂ ﺗﻢ) اﻟﮭﯿﻜﻞ ﻧﻤﻮذج( أﺳ ﻋﻠﻰ واﻟﻤﺒﻨﻲ ﻓﺮض طﺮﯾﻘﺔ ﺎس اﻟﻤﺴﺘﻘﺮة ﻏﯿﺮ اﻟﻤﻨﻔﺼﻠﺔ واﻟﺪواﻣﺎت اﻷﺷﺮطﺔ طﺮﯾﻘﺔ ﻣﻊ اﻟﻨﺴﻖ) اﻟﻨﻤﻮذج اﻻﯾﺮودﯾﻨﺎﻣﻲ( ﻣﻮﺛﻮﻗﺔ طﺮﯾﻘﺔ ﻟﺒﻨﺎء واﻟﮭﯿﻜﻞ اﻟﻤﺎﺋﻊ ﺑﯿﻦ ﻟﻠﺘﺪاﺧﻞ ﻧﺴﺒﯿﺎ وﺑﺴﯿﻄﺔ. اﻻﻋﻤﺎل ﻣﻊ ﻣﻘﺎرﻧﺘﮭﺎ ﺧﻼل ﻣﻦ اﺧﺘﺒﺎرھﺎ ﺗﻢ اﻟﻄﺮﯾﻘﺔ ھﺬه ﻓﻌﺎﻟﯿﺔ وﻣﻦ ﻟﻠﺼﻔﺎﺋﺢ اﻟﺮﻓﺮﻓﺔ ﺑﺤﺎﻟﺔ ﺗﺘﻨﺒﺊ اﻟﺘﻲ اﻟﻤﻨﺸﻮرة اﻟﺮﯾﺢ ﻟﻨﻔﻖ اﻟﻌﻤﻠﯿﺔ ﻗﯿﺎﺳﺎت ﺧﻼل. ﻟﻠﻨﻈﺎم اﻟﮭﻮاﺋﯿﺔ ﻟﻠﺪﯾﻨﺎﻣﯿﻜﯿﺔ اﻻﺳﺘﻘﺮار ﻋﺪم ﻟﻔﺤﺺ اﻟﺰﻣﻨﻲ اﻟﻤﺠﺎل اﻟﻤﺤﺎﻛﺎة اﺳﺘﺨﺪام. ﺣﺪوث ﻣﻦ اﻟﺘﺤﻘﻖ ﺗﻢ ﺑﺎﻟﺘﺒﺎﻋﺪ اﻻﺳﺘﺠﺎﺑﺎت ﺗﺒﺪاء ﻋﻨﺪﻣﺎ رﻓﺮﻓﺔ. ﻟﺘﺤﻮﯾﻞ اﻟﺴﺮﯾﻌﺔ ﻓﻮرﯾﺮ ﺗﺤﻮﯾﻠﺔ ﺗﻘﻨﯿﺔ اﺳﺘﺨﺪﻣﺖ، اﻟﺮﻓﺮﻓﺔ ﺗﺮدد ﻟﺘﺨﻤﯿﻦ اﻟﺰﻣﻨﯿ اﻻﺳﺘﺠﺎﺑﺎت اﻟﺘﺮدد ﻣﺠﺎل اﻟﻰ اﻟﻌﺎﻣﺔ ﻟﻼﺣﺪاﺛﯿﺎت ﺔ. ﺻﻔﺎﺋﺢ ﻣﻦ ﻟﻌﺪد رﻓﺮﻓﺔ وﺗﺮدد اﻟﺮﻓﺮﻓﺔ ﺑﺴﺮﻋﺔ اﻟﺘﻨﺒﺊ ﺗﻢ اﻟﻤﻨﺸﻮرة اﻷﻋﻤﺎل ﻣﻊ ﺟﯿﺪ ﺗﻮاﻓﻖ اظﮭﺮت واﻟﻨﺘﺎﺋﺞ اﻟﺒﺎﻋﯿﺔ اﻟﻨﺴﺒﺔ ﻓﻲ ﺗﺨﺘﻠﻒ اﻟﺘﻲ و اﻟﻜﺎﺑﻮﻟﯿﺔ اﻷﻟﻮﻣﻨﯿﻮم.