Aeroelastic Wind Tunnel Testing of Very Flexible High-Aspect-Ratio Wings
|
|
- Gregory Shaw
- 5 years ago
- Views:
Transcription
1 Aeroelastic Wind Tunnel Testing of Very Flexible High-Aspect-Ratio Wings Justin Jaworski Workshop on Recent Advances in Aeroelasticity, Experiment and Theory July 2, 2010
2 Problem and Scope High altitude long endurance (HAE) aircraft May operate at large deformations Aeroelastic phenomena can lead to catastrophic structural failure Nonlinear structural and aerodynamic effects are important for very flexible aircraft We will address flutter and limit cycle oscillation (O) physics in low subsonic flow Mach = Reynolds ~ 10 6 eap frog increments in the fidelity/sophistication of theory and experiment to better understand O of HAE-type wings
3 Nonlinear Dynamic Response Amplitude Amplitude X Airspeed Good nonlinearity Airspeed X Bad nonlinearity GOA: haracterize dangerous sub-critical behavior with wind tunnel experiments and correlate with predictive models
4 Wind Tunnel Test Procedure Increase air speed in small increments past flutter point Flutter leads to limit cycle oscillation Frequency and amplitude at half-span measured with an accelerometer Pitch/plunge at wing tip measured with laser/mirror system Decrease air speed slowly in small increments until static state is recovered Mirror Accelerometer Metrics for success Flutter speed imit cycle oscillation (O) amplitude Hysteresis Tunnel specifications Test section: 0.7 x 0.53 x 1.52 m 3 Max speed: 90 m/s (200 mph)
5 ANSYS Model of HAE Wing NAA0012 Dimensions in millimeters. Tip store placed at O Use finite element modeling to validate the use of continuum beam models for representing the non-uniform experimental wing structure. J.W. Jaworski and E.H. Dowell, J. Aircraft 26(2), 2009,
6 Aeroelastic Results for Wind- Tunnel-based Aerodynamics θ 0 =1 O Simulation Bifurcation Diagram D. Tang and E.H. Dowell, AIAA Journal 39(8), 2001,
7 Improvement of Aerodynamic Model Research Question How do the aeroelastic simulation results change if you use an aerodynamic model based on FD aerodynamic data instead of wind tunnel data? Flutter speed and limit cycle oscillations Anticipate deviation of computational aeroelastic predictions and experiment Approach Identify a dynamic stall aerodynamic model based on FD computations Modify existing time-marching aeroelastic model for FD-based aerodynamics
8 ontinuum Aeroelastic Model EI w ( EI EI )( φ v ) mw&& Mw&& Mgδ ( x ) = ( IV ) x= ( I ) EI v EI E ( φw ) mv&& Mv&& = ( IV ) x= ( EI E ) GJφ I w v mk && φ = m dm x I & φ φ x = = dx dfv dx dm dx x z, w dfw dx Nonlinear stiffness from elastic coupling Modal expansions convert equations to ODEs in time Geometric twist angle depends on elastic interaction: y, v x, φ φˆ = φ x v w dx 0 D. Tang and E.H. Dowell, J. Fluids and Structures 19(2004)
9 Aerodynamic Model Strip theory assumption Wing treated as a series of uniform panels 3D fluid effects neglected Approximation valid for slender wings ONERA semi-empirical dynamic stall model used to compute aero loads on each panel
10 ONERA dynamic stall model = = = = α α φ σ α α φ σ α λ λ φ α γ γ γ & & && && & & & && & v e r r a a a k s b b b a b a ) ( ) ( 0 0 ( ) ( ) ( ) [ ] ,,,,, v r r r e e e a a a k s a = = = σ α λ = const. ift (or moment) divided into linear ( a ) and nonlinear ( b ) contributions Requires both static and dynamic lift data to identify parameters Distinguishes between pitch angle (φ) and effective angle of attack (α) that includes quasi-steady effects Easily solved in state-space form
11 Static ift Deviation Nonlinear equation of the ONERA model is forced by the static lift deficit, Better agreement between experiment and FD values than for simplified static model The static lift deficit function,, is the main difference between the nonlinear contributions of the FD- and wind-tunnel-based ONERA dynamic stall models
12 Effect of Structural Nonlinearity Hysteresis disappears from O when nonlinear elastic coupling is removed This effect is independent of the ONERA model parameters
13 Bifurcation Diagram for ONERA Model Variants Experiment Original Simulation (Wind Tunnel Model) inear/nonlinear Aero: Wind Tunnel/FD inear/nonlinear Aero: FD/Wind Tunnel
14 onclusions Accurate flutter prediction of HAE wing flutter requires nonlinearity in both the structure and aerodynamic models orrect higher-order flutter mode predicted Good quantitative agreement between theory and experiment Flutter speed O amplitude O hysteresis requires structural nonlinearity Aerodynamic stall dynamics effect the hysteresis bandwidth when structural nonlinearity is included in the model Aerodynamic nonlinearity required in aeroelastic model for stable O inear and nonlinear lift based on FD data increase the O amplitude and flutter speed relative to aerodynamic models based on wind tunnel data
15 Future Work Include rigid body modes in aeroelastic analysis More realistic representation of flight configuration Experimental flow field measurements about wing in O motion Investigate roles of dynamic stall and 3D flow First-principles aeroelastic analysis with FD Time domain vs. Frequency domain
16 Acknowledgments Prof. Earl Dowell Prof. Donald Bliss Prof. Kenneth Hall Prof. aurens Howle Prof. awrence Virgin Dr. Deman Tang Dr. Jeffrey Thomas Dr. had uster Dr. Howard onyers
PRESENTED AT ICAS 2008 ANCHORAGE, ALASKA SEPTEMBER 2008
PRESENTED AT ICAS 2008 ANCHORAGE, ALASKA SEPTEMBER 2008 NONLINEAR AEROELASTICITY OF CURRENT AND FUTURE AEROSPACE VEHICLES Earl Dowell, Kenneth Hall, Robert Kielb, Deman Tang, and Jeffrey Thomas Duke University
More informationLimit Cycle Oscillations of a Typical Airfoil in Transonic Flow
Limit Cycle Oscillations of a Typical Airfoil in Transonic Flow Denis B. Kholodar, United States Air Force Academy, Colorado Springs, CO 88 Earl H. Dowell, Jeffrey P. Thomas, and Kenneth C. Hall Duke University,
More informationFREQUENCY DOMAIN FLUTTER ANALYSIS OF AIRCRAFT WING IN SUBSONIC FLOW
FREQUENCY DOMAIN FLUTTER ANALYSIS OF AIRCRAFT WING IN SUBSONIC FLOW Ms.K.Niranjana 1, Mr.A.Daniel Antony 2 1 UG Student, Department of Aerospace Engineering, Karunya University, (India) 2 Assistant professor,
More informationExperiment. Justin W. Jaworski. Department of Mechanical Engineering and Materials Science Duke University. Approved: Dr. Earl H.
Nonlinear Aeroelastic Analysis of Flexible High Aspect Ratio Wings Including Correlation With Experiment by Justin W. Jaworski Department of Mechanical Engineering and Materials Science Duke University
More informationAeroelastic Limit Cycle Oscillations in High Performance Aircraft
Earl Hugh Dowell Duke University Durham, North Carolina United States dowell@mail.ee.duke.edu ABSTRACT An overview is presented of limit cycle oscillations (LCO) that occur due to the nonlinear aeroelastic
More informationWind Tunnel Experiments of Stall Flutter with Structural Nonlinearity
Wind Tunnel Experiments of Stall Flutter with Structural Nonlinearity Ahmad Faris R.Razaami School of Aerospace Engineering, Universiti Sains Malaysia, Penang, MALAYSIA Norizham Abdul Razak School of Aerospace
More informationAeroelastic Gust Response
Aeroelastic Gust Response Civil Transport Aircraft - xxx Presented By: Fausto Gill Di Vincenzo 04-06-2012 What is Aeroelasticity? Aeroelasticity studies the effect of aerodynamic loads on flexible structures,
More informationA HARMONIC BALANCE APPROACH FOR MODELING THREE-DIMENSIONAL NONLINEAR UNSTEADY AERODYNAMICS AND AEROELASTICITY
' - ' Proceedings of ASME International Mechanical Engineering Conference and Exposition November 17-22, 22, New Orleans, Louisiana, USA IMECE-22-3232 A HARMONIC ALANCE APPROACH FOR MODELING THREE-DIMENSIONAL
More informationAeroelasticity. Lecture 9: Supersonic Aeroelasticity. G. Dimitriadis. AERO0032-1, Aeroelasticity and Experimental Aerodynamics, Lecture 9
Aeroelasticity Lecture 9: Supersonic Aeroelasticity G. Dimitriadis AERO0032-1, Aeroelasticity and Experimental Aerodynamics, Lecture 9 1 Introduction All the material presented up to now concerned incompressible
More informationAn Investigation of the Sensitivity of F-16 Fighter Flutter Onset and Limit Cycle Oscillations to Uncertainties
An Investigation of the Sensitivity of F-16 Fighter Flutter Onset and Limit Cycle Oscillations to Uncertainties Jeffrey P. Thomas, Earl H. Dowell, and Kenneth C. Hall Duke University, Durham, NC 27708
More informationVirtual Aeroelastic Flight Testing for the F-16 Fighter with Stores
Virtual Aeroelastic Flight Testing for the F-16 Fighter with Stores Jeffrey P. Thomas, Earl H. Dowell, and Kenneth C. Hall Duke University, Durham, NC 27708 0300 and Charles M. Denegri Jr. U.S. Air Force
More informationDynamic Response of an Aircraft to Atmospheric Turbulence Cissy Thomas Civil Engineering Dept, M.G university
Dynamic Response of an Aircraft to Atmospheric Turbulence Cissy Thomas Civil Engineering Dept, M.G university cissyvp@gmail.com Jancy Rose K Scientist/Engineer,VSSC, Thiruvananthapuram, India R Neetha
More informationTHE ANALYSIS OF LAMINATE LAY-UP EFFECT ON THE FLUTTER SPEED OF COMPOSITE STABILIZERS
THE ANALYSIS OF LAMINATE LAY-UP EFFECT ON THE FLUTTER SPEED OF COMPOSITE STABILIZERS Mirko DINULOVIĆ*, Boško RAŠUO* and Branimir KRSTIĆ** * University of Belgrade, Faculty of Mechanical Engineering, **
More informationDYNAMIC RESPONSE OF AN AIRPLANE ELASTIC STRUCTURE IN TRANSONIC FLOW
DYNAMIC RESPONSE OF AN AIRPLANE ELASTIC STRUCTURE IN TRANSONIC FLOW S. Kuzmina*, F. Ishmuratov*, O. Karas*, A.Chizhov* * Central Aerohydrodynamic Institute (TsAGI), Zhukovsky, Russia Keywords: aeroelasticity,
More informationFLUID STRUCTURE INTERACTIONS PREAMBLE. There are two types of vibrations: resonance and instability.
FLUID STRUCTURE INTERACTIONS PREAMBLE There are two types of vibrations: resonance and instability. Resonance occurs when a structure is excited at a natural frequency. When damping is low, the structure
More informationVirtual Work & Energy Methods. External Energy-Work Transformation
External Energy-Work Transformation Virtual Work Many structural problems are statically determinate (support reactions & internal forces can be found by simple statics) Other methods are required when
More informationAeroelastic Limit Cycles As A Small Scale Energy Source
Aeroelastic Limit Cycles As A Small Scale Energy Source Jared Dunnmon 8 th Int. Conf. on Multibody Systems, Nonlinear Dynamics, and Control Advised by Professor Earl Dowell, Duke University August 29,
More informationAero-Propulsive-Elastic Modeling Using OpenVSP
Aero-Propulsive-Elastic Modeling Using OpenVSP August 8, 213 Kevin W. Reynolds Intelligent Systems Division, Code TI NASA Ames Research Center Our Introduction To OpenVSP Overview! Motivation and Background!
More informationAE 714 Aeroelastic Effects in Structures Term Project (Revised Version 20/05/2009) Flutter Analysis of a Tapered Wing Using Assumed Modes Method
AE 714 Aeroelastic Effects in Structures Term Project (Revised Version 20/05/2009) Flutter Analysis of a Tapered Wing Using Assumed Modes Method Project Description In this project, you will perform classical
More informationAir Loads. Airfoil Geometry. Upper surface. Lower surface
AE1 Jha Loads-1 Air Loads Airfoil Geometry z LE circle (radius) Chord line Upper surface thickness Zt camber Zc Zl Zu Lower surface TE thickness Camber line line joining the midpoints between upper and
More informationFIFTH INTERNATIONAL CONGRESSON SOUND AND VIBRATION DECEMBER15-18, 1997 ADELAIDE,SOUTHAUSTRALIA
FIFTH INTERNATIONAL CONGRESSON SOUND AND VIBRATION DECEMBER15-18, 1997 ADELAIDE,SOUTHAUSTRALIA Aeroelastic Response Of A Three Degree Of Freedom Wing-Aileron System With Structural Non-Linearity S. A.
More informationSome effects of large blade deflections on aeroelastic stability
47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition 5-8 January 29, Orlando, Florida AIAA 29-839 Some effects of large blade deflections on aeroelastic stability
More informationAeroelasticity. Lecture 7: Practical Aircraft Aeroelasticity. G. Dimitriadis. AERO0032-1, Aeroelasticity and Experimental Aerodynamics, Lecture 7
Aeroelasticity Lecture 7: Practical Aircraft Aeroelasticity G. Dimitriadis AERO0032-1, Aeroelasticity and Experimental Aerodynamics, Lecture 7 1 Non-sinusoidal motion Theodorsen analysis requires that
More informationUsing Automatic Differentiation to Create a Nonlinear Reduced Order Model Aeroelastic Solver
Using Automatic Differentiation to Create a Nonlinear Reduced Order Model Aeroelastic Solver Jeffrey P. Thomas, Earl H. Dowell, and Kenneth C. Hall Duke University, Durham, NC 27708 0300 A novel nonlinear
More informationStrain-Based Analysis for Geometrically Nonlinear Beams: A Modal Approach
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference2th AI 23-26 April 212, Honolulu, Hawaii AIAA 212-1713 Strain-Based Analysis for Geometrically Nonlinear Beams: A
More informationOptimization Framework for Design of Morphing Wings
Optimization Framework for Design of Morphing Wings Jian Yang, Raj Nangia & Jonathan Cooper Department of Aerospace Engineering, University of Bristol, UK & John Simpson Fraunhofer IBP, Germany AIAA Aviation
More informationStructural Nonlinear Flutter Characteristics Analysis for an Actuator-fin System with Dynamic Stiffness
Chinese Journal of Aeronautics 4 (11) 59-599 Contents lists available at ScienceDirect Chinese Journal of Aeronautics journal homepage: www.elsevier.com/locate/cja Structural Nonlinear Flutter Characteristics
More informationStability and Control
Stability and Control Introduction An important concept that must be considered when designing an aircraft, missile, or other type of vehicle, is that of stability and control. The study of stability is
More informationExperimental Aerodynamics. Experimental Aerodynamics
Lecture 3: Vortex shedding and buffeting G. Dimitriadis Buffeting! All structures exposed to a wind have the tendency to vibrate.! These vibrations are normally of small amplitude and have stochastic character!
More informationNonlinear Aeroelastic Analysis of a Wing with Control Surface Freeplay
Copyright c 7 ICCES ICCES, vol., no.3, pp.75-8, 7 Nonlinear Aeroelastic Analysis of a with Control Surface Freeplay K.S. Kim 1,J.H.Yoo,J.S.Bae 3 and I. Lee 1 Summary In this paper, nonlinear aeroelastic
More informationDrag Computation (1)
Drag Computation (1) Why drag so concerned Its effects on aircraft performances On the Concorde, one count drag increase ( C D =.0001) requires two passengers, out of the 90 ~ 100 passenger capacity, be
More informationPROGRESS IN THE PREDICTION OF AEROSERVOELASTIC INSTABILITIES ON LARGE CIVIL TRANSPORT AIRCRAFT
ICAS 2000 CONGRESS PROGRESS IN THE PREDICTION OF AEROSERVOELASTIC INSTABILITIES ON LARGE CIVIL TRANSPORT AIRCRAFT M.LACABANNE, A.LAPORTE AEROSPATIALE MATRA AIRBUS, 31060 Toulouse Cedex 03, France Abstract
More informationSimulation of Aeroelastic System with Aerodynamic Nonlinearity
Simulation of Aeroelastic System with Aerodynamic Nonlinearity Muhamad Khairil Hafizi Mohd Zorkipli School of Aerospace Engineering, Universiti Sains Malaysia, Penang, MALAYSIA Norizham Abdul Razak School
More informationImprovement of flight regarding safety and comfort
Prediction of the aeroelastic behavior An application to wind-tunnel models Mickaël Roucou Royal Institute of Technology KTH - Stockholm, Sweden Department of Aerospace and Vehicle Engineering Email: roucou@kth.se
More informationUncertainty Quantification in Gust Loads Analysis of a Highly Flexible Aircraft Wing
Uncertainty Quantification in Gust Loads Analysis of a Highly Flexible Aircraft Wing IFASD 2017 25 th - 28 th June 2017, Como R. G. Cook, C. Wales, A. L. Gaitonde, D. P. Jones and Jonathan Cooper University
More informationEfficient Modelling of a Nonlinear Gust Loads Process for Uncertainty Quantification of Highly Flexible Aircraft
Efficient Modelling of a Nonlinear Gust Loads Process for Uncertainty Quantification of Highly Flexible Aircraft SciTech, 8 th -12 th January 2018 Kissimmee, Florida Robert Cook, Chris Wales, Ann Gaitonde,
More informationPerformance. 7. Aircraft Performance -Basics
Performance 7. Aircraft Performance -Basics In general we are interested in finding out certain performance characteristics of a vehicle. These typically include: how fast and how slow an aircraft can
More information02 Introduction to Structural Dynamics & Aeroelasticity
02 Introduction to Structural Dynamics & Aeroelasticity Vibraciones y Aeroelasticidad Dpto. de Vehículos Aeroespaciales P. García-Fogeda Núñez & F. Arévalo Lozano ESCUELA TÉCNICA SUPERIOR DE INGENIERÍA
More informationAeroelasticity in Dynamically Pitching Wind Turbine Airfoils
Aeroelasticity in Dynamically Pitching Wind Turbine Airfoils Andrew Magstadt, John Strike, Michael Hind, Pourya Nikoueeyan, and Jonathan Naughton Dept. of Mechanical Engineering Wind Energy Research Center
More informationFlight Dynamics and Control. Lecture 3: Longitudinal stability Derivatives G. Dimitriadis University of Liege
Flight Dynamics and Control Lecture 3: Longitudinal stability Derivatives G. Dimitriadis University of Liege Previously on AERO0003-1 We developed linearized equations of motion Longitudinal direction
More informationMechanics of Flight. Warren F. Phillips. John Wiley & Sons, Inc. Professor Mechanical and Aerospace Engineering Utah State University WILEY
Mechanics of Flight Warren F. Phillips Professor Mechanical and Aerospace Engineering Utah State University WILEY John Wiley & Sons, Inc. CONTENTS Preface Acknowledgments xi xiii 1. Overview of Aerodynamics
More informationImplementing a Partitioned Algorithm for Fluid-Structure Interaction of Flexible Flapping Wings within Overture
10 th Symposimum on Overset Composite Grids and Solution Technology, NASA Ames Research Center Moffett Field, California, USA 1 Implementing a Partitioned Algorithm for Fluid-Structure Interaction of Flexible
More informationFlight-Dynamics, Flutter, and Active-Flutter-Suppression Analyses of a Flexible Flying-Wing Research Drone
Flight-Dynamics, Flutter, and Active-Flutter-Suppression Analyses of a Flexible Flying-Wing Research Drone Dr. David K. Schmidt dschmidt@uccs.edu Professor Emeritus University of Colorado Principal D.K.
More informationREPORT DOCUMENTATION PAGE Form Approved OMB No
REPORT DOCUMENTATION PAGE Form Approved OMB No. 74-188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions,
More informationAEROSPACE ENGINEERING
AEROSPACE ENGINEERING Subject Code: AE Course Structure Sections/Units Topics Section A Engineering Mathematics Topics (Core) 1 Linear Algebra 2 Calculus 3 Differential Equations 1 Fourier Series Topics
More informationNON-LINEAR BEHAVIOUR OF A WING DUE TO UNDERWING STORES
NON-LINEAR BEHAVIOUR OF A WING DUE TO UNDERWING STORES G.A. Vio,, D.S. Stanley, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney NSW 6, Australia gareth.vio@sydney.edu.au;
More informationUnconstrained flight and stability analysis of a flexible rocket using a detailed finite-element based procedure
Computational Ballistics II 357 Unconstrained flight and stability analysis of a flexible rocket using a detailed finite-element based procedure D. J. McTavish, D. R. Greatrix & K. Davidson Ryerson University,
More informationSCIENCE CHINA Physics, Mechanics & Astronomy. A nonlinear POD reduced order model for limit cycle oscillation prediction
SCIENCE CHINA Physics Mechanics & Astronomy Research Paper July 1 Vol.53 No.7: 135 133 doi: 1.17/s11433-1-413- A nonlinear POD reduced order model for limit cycle oscillation prediction CHEN Gang * LI
More informationStability and Control Some Characteristics of Lifting Surfaces, and Pitch-Moments
Stability and Control Some Characteristics of Lifting Surfaces, and Pitch-Moments The lifting surfaces of a vehicle generally include the wings, the horizontal and vertical tail, and other surfaces such
More informationAeroelastic Analysis of Engine Nacelle Strake Considering Geometric Nonlinear Behavior
Aeroelastic Analysis of Engine Nacelle Strake Considering Geometric Nonlinear Behavior N. Manoj Abstract The aeroelastic behavior of engine nacelle strake when subjected to unsteady aerodynamic flows is
More informationOn the Dynamics of Suspension Bridge Decks with Wind-induced Second-order Effects
MMPS 015 Convegno Modelli Matematici per Ponti Sospesi Politecnico di Torino Dipartimento di Scienze Matematiche 17-18 Settembre 015 On the Dynamics of Suspension Bridge Decks with Wind-induced Second-order
More informationON THE NONLINEAR DYNAMICS APPROACH OF MODELING THE BIFURCATION FOR TRANSONIC LIMIT CYCLE FLUTTER
ICAS CONGRESS ON THE NONLINEAR DYNAMICS APPROACH OF MODELING THE BIFURCATION FOR TRANSONIC LIMIT CYCLE FLUTTER H. Matsushita *, T. Miyata *, L. E. Christiansen **, T. Lehn-Schiøler **, and E. Mosekilde
More informationFundamentals of Airplane Flight Mechanics
David G. Hull Fundamentals of Airplane Flight Mechanics With 125 Figures and 25 Tables y Springer Introduction to Airplane Flight Mechanics 1 1.1 Airframe Anatomy 2 1.2 Engine Anatomy 5 1.3 Equations of
More informationGerman Aerospace Center (DLR)
German Aerospace Center (DLR) AEROGUST M30 Progress Meeting 23-24 November 2017, Bordeaux Presented by P. Bekemeryer / J. Nitzsche With contributions of C. Kaiser 1, S. Görtz 2, R. Heinrich 2, J. Nitzsche
More informationEXPERIMENTAL INVESTIGATION OF THE DYNAMIC STABILITY DERIVATIVES FOR A FIGHTER MODEL
24 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES EXPERIMENTAL INVESTIGATION OF THE DYNAMIC STABILITY DERIVATIVES FOR A FIGHTER MODEL MR Soltani*, Ali R Davari** *Associate Professor, **PhD Student
More informationCFD COMPUTATION OF THE GROUND EFFECT ON AIRPLANE WITH HIGH ASPECT RATIO WING
28 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES CFD COMPUTATION OF THE GROUND EFFECT ON AIRPLANE WITH HIGH ASPECT RATIO WING Sun Tae Kim*, Youngtae Kim**, Tae Kyu Reu* *Agency for Defense Development,
More informationUniversity of Bristol - Explore Bristol Research
Castellani, M., Cooper, J. E., & Lemmens, Y. (217). Nonlinear Static Aeroelasticity of High Aspect Ratio Wing Aircraft by FEM and Multibody Methods. Journal of Aircraft, 54(2), 548-56. https://doi.org/1.2514/1.c33825
More informationPerformance. 5. More Aerodynamic Considerations
Performance 5. More Aerodynamic Considerations There is an alternative way of looking at aerodynamic flow problems that is useful for understanding certain phenomena. Rather than tracking a particle of
More information4-7. Elementary aeroelasticity
a Aeroelasticity Dynamic... Dynamic Static stability... Static 4-7 Istability Load Divergence Control Flutter Buffeting Dynamic distribution reversal response Elementary aeroelasticity Aircraft structures,
More informationAerodynamics Gust Response Prediction
Aerodynamics Gust Response Prediction Alexis RIGALDO Department of Aerospace and Vehicle Engineering Royal Institute of Technology - SE 114 15 Stockholm, Sweden E-Mail:rigaldo@kth.se Thesis performed within
More informationPRINCIPLES OF FLIGHT
1 Considering a positive cambered aerofoil, the pitching moment when Cl=0 is: A infinite B positive (nose-up). C negative (nose-down). D equal to zero. 2 The angle between the aeroplane longitudinal axis
More informationReduced reliance on wind tunnel data
Reduced reliance on wind tunnel data The recreation of the industrial gust loads process, using CFD in place of experimental data Investigation of the underlying assumptions of the current industrial gust
More informationUniversity of Bristol - Explore Bristol Research. Peer reviewed version. Link to published version (if available): /6.
Castellani, M., Cooper, J. E., & Lemmens, Y. (216). Nonlinear Static Aeroelasticity of High Aspect Ratio Wing Aircraft by FEM and Multibody Methods. In 15th Dynamics Specialists Conference [(AIAA 216-1573]
More informationDYNAMIC STALL ONSET VARIATION WITH REDUCED FREQUENCY FOR THREE STALL MECHANISMS
International Forum on Aeroelasticity and Structural Dynamics IFASD 27 25-28 June 27 Como, Italy DYNAMIC STALL ONSET VARIATION WITH REDUCED FREQUENCY FOR THREE STALL MECHANISMS Boutet Johan, Dimitriadis
More informationTime-domain modelling of the wind forces acting on a bridge deck with indicial functions
POLITECNICO DI MILANO Facoltà di Ingegneria Civile, Ambientale e Territoriale Corso di Laurea Specialistica in Ingegneria Civile Indirizzo Strutture Time-domain modelling of the wind forces acting on a
More informationThe future of non-linear modelling of aeroelastic gust interaction
The future of non-linear modelling of aeroelastic gust interaction C. J. A. Wales, C. Valente, R. G. Cook, A. L. Gaitonde, D. P. Jones, J. E. Cooper University of Bristol AVIATION, 25 29 June 2018 Hyatt
More informationOPTIMIZATION OF TAPERED WING STRUCTURE WITH AEROELASTIC CONSTRAINT
ICAS 000 CONGRESS OPTIMIZATION OF TAPERED WING STRUCTURE WITH AEROELASTIC CONSTRAINT Harijono Djojodihardjo, I Wayan Tjatra, Ismojo Harjanto 3 Computational Aeroelastic Group, Aerospace Engineering Department
More informationgirder under the larger pitching amplitude, which means that the aerodynamic forces can provide both the positive and negative works within one vibrat
The nonlinear aerodynamic stability of long-span bridges: post flutter Wang Qi a, Liao Hai-li a a Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu, China ABSTRACT: The linear
More informationUniversity of Bristol - Explore Bristol Research
Castellani, M., Cooper, J. E., & Lemmens, Y. (6). Flight Loads Prediction of High Aspect Ratio Wing Aircraft using Dynamics. SAE International Journal of Aerospace, 6, [48587]. DOI:.55/6/48587 Publisher's
More informationNonlinear buffeting response of bridge deck using the Band Superposition approach: comparison between rheological models and convolution integrals.
Nonlinear buffeting response of bridge deck using the Band Superposition approach: comparison between rheological models and convolution integrals. Argentini, T. ), Diana, G. ), Portentoso, M. * ), Rocchi,
More informationShafts: Torsion of Circular Shafts Reading: Crandall, Dahl and Lardner 6.2, 6.3
M9 Shafts: Torsion of Circular Shafts Reading: Crandall, Dahl and Lardner 6., 6.3 A shaft is a structural member which is long and slender and subject to a torque (moment) acting about its long axis. We
More informationLecture No. # 09. (Refer Slide Time: 01:00)
Introduction to Helicopter Aerodynamics and Dynamics Prof. Dr. C. Venkatesan Department of Aerospace Engineering Indian Institute of Technology, Kanpur Lecture No. # 09 Now, I just want to mention because
More informationFlight Dynamics, Simulation, and Control
Flight Dynamics, Simulation, and Control For Rigid and Flexible Aircraft Ranjan Vepa CRC Press Taylor & Francis Group Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Group, an
More information( ) (where v = pr ) v V
Problem # The DOF idealized wing whose cross-section is shown in Figure. has leading edge and trailing edge control surfaces. There is no initial angle of attack when the two control surfaces are undeflected.
More informationTheoretical Modeling, Experimental Observation, and Reliability Analysis of Flow-induced Oscillations in Offshore Wind Turbine Blades
University of Massachusetts Amherst ScholarWorks@UMass Amherst Doctoral Dissertations Dissertations and Theses 2016 Theoretical Modeling, Experimental Observation, and Reliability Analysis of Flow-induced
More informationIntroduction to Structural Dynamics and Aeroelasticity
Introduction to Structural Dynamics and Aeroelasticity DEWEY H. HODGES Georgia Institute of Technology G. ALVIN PIERCE Georgia Institute of Technology PUBLISHED BY THE PRESS SYNDICATE OF THE UNIVERSITY
More informationA NONLINEAR HARMONIC BALANCE METHOD FOR THE CFD CODE OVERFLOW 2
IFASD-2009-050 A NONLINEAR HARMONIC BALANCE METHOD FOR THE CFD CODE OVERFLOW 2 Chad H. Custer 1, Jeffrey P. Thomas 2, Earl H. Dowell 3, and Kenneth C. Hall 4 Duke University Mechanical Engineering & Materials
More informationUsing Automatic Differentiation to Create a Nonlinear Reduced Order Model of a Computational Fluid Dynamic Solver
Using Automatic Differentiation to Create a Nonlinear Reduced Order Model of a Computational Fluid Dynamic Solver Jeffrey P. Thomas, Earl H. Dowell, and Kenneth C. Hall Duke University, Durham, NC 2778
More informationAeroelasticity & Experimental Aerodynamics. Lecture 7 Galloping. T. Andrianne
Aeroelasticity & Experimental Aerodynamics (AERO0032-1) Lecture 7 Galloping T. Andrianne 2015-2016 Dimensional analysis (from L6) Motion of a linear structure in a subsonic, steady flow Described by :
More informationCHARACTERIZATION OF THE NONLINEAR AEROELASTIC BEHAVIOR OF AN AIRFOIL WITH FREEPLAY AND AERODYNAMIC NONLINEARITY
Abstract CHARACTERIZATION OF THE NONLINEAR AEROELASTIC BEHAVIOR OF AN AIRFOIL WITH FREEPLAY AND AERODYNAMIC NONLINEARITY Michael Candon, Robert Carrese, Hideaki Ogawa, Pier Marzocca School of Engineering
More informationDefinitions. Temperature: Property of the atmosphere (τ). Function of altitude. Pressure: Property of the atmosphere (p). Function of altitude.
Definitions Chapter 3 Standard atmosphere: A model of the atmosphere based on the aerostatic equation, the perfect gas law, an assumed temperature distribution, and standard sea level conditions. Temperature:
More informationCombined Local Global Variability and Uncertainty in the Aeroservoelasticity of Composite Aircraft
Combined Local Global Variability and Uncertainty in the Aeroservoelasticity of Composite Aircraft Presented by Dr. Eli Livne Department of Aeronautics and Astronautics University of Washington Contributors
More informationAN ENHANCED CORRECTION FACTOR TECHNIQUE FOR AERODYNAMIC INFLUENCE COEFFICIENT METHODS
AN ENHANCED CORRECTION ACTOR TECHNIQUE OR AERODYNAMIC INLUENCE COEICIENT METHODS Ioan Jadic, Dayton Hartley and Jagannath Giri Raytheon Aircraft Company, Wichita, Kansas 67-85 Phone: 36-676-436 E-mail:
More informationTransonic Flutter Prediction of Supersonic Jet Trainer with Various External Store Configurations
Transonic Flutter Prediction of Supersonic Jet Trainer with Various External Store Configurations In Lee * Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea Hyuk-Jun Kwon Agency
More informationMULTIDISCPLINARY OPTIMIZATION AND SENSITIVITY ANALYSIS OF FLUTTER OF AN AIRCRAFT WING WITH UNDERWING STORE IN TRANSONIC REGIME
MULTIDISCPLINARY OPTIMIZATION AND SENSITIVITY ANALYSIS OF FLUTTER OF AN AIRCRAFT WING WITH UNDERWING STORE IN TRANSONIC REGIME A thesis submitted in partial fulfillment of the requirements for the degree
More informationABSTRACT. Thomas Woodrow Sukut, 2d Lt USAF
ABSTRACT Nonlinear Aeroelastic Analysis of UAVs: Deterministic and Stochastic Approaches By Thomas Woodrow Sukut, 2d Lt USAF Aeroelastic aspects of unmanned aerial vehicles (UAVs) is analyzed by treatment
More informationA METHOD OF LOAD INCREMENTS FOR THE DETERMINATION OF SECOND-ORDER LIMIT LOAD AND COLLAPSE SAFETY OF REINFORCED CONCRETE FRAMED STRUCTURES
A METHOD OF LOAD INCREMENTS FOR THE DETERMINATION OF SECOND-ORDER LIMIT LOAD AND COLLAPSE SAFETY OF REINFORCED CONCRETE FRAMED STRUCTURES Konuralp Girgin (Ph.D. Thesis, Institute of Science and Technology,
More informationAPPLICATION OF ARTIFICIAL NEURAL NETWORK IN MODELING OF ENTOMOPTER DYNAMICS
APPLICATION OF ARTIFICIAL NEURAL NETWORK IN MODELING OF ENTOMOPTER DYNAMICS Paweł Czekałowski*, Krzysztof Sibilski**, Andrzej Żyluk** *Wroclaw University of Technology, **Air Force Institute of Technology
More informationChapter 5 Performance analysis I Steady level flight (Lectures 17 to 20) Keywords: Steady level flight equations of motion, minimum power required,
Chapter 5 Performance analysis I Steady level flight (Lectures 17 to 20) Keywords: Steady level flight equations of motion, minimum power required, minimum thrust required, minimum speed, maximum speed;
More informationCOMPUTATION OF CASCADE FLUTTER WITH A COUPLED AERODYNAMIC AND STRUCTURAL MODEL
COMPUTATION OF CASCADE FLUTTER WITH A COUPLED AERODYNAMIC AND STRUCTURAL MODEL M. SADEGHI AND F. LIU Department of Mechanical and Aerospace Engineering University of California, Irvine, CA 92697-3975,
More informationSPC Aerodynamics Course Assignment Due Date Monday 28 May 2018 at 11:30
SPC 307 - Aerodynamics Course Assignment Due Date Monday 28 May 2018 at 11:30 1. The maximum velocity at which an aircraft can cruise occurs when the thrust available with the engines operating with the
More informationFLIGHT DYNAMICS. Robert F. Stengel. Princeton University Press Princeton and Oxford
FLIGHT DYNAMICS Robert F. Stengel Princeton University Press Princeton and Oxford Preface XV Chapter One Introduction 1 1.1 ELEMENTS OF THE AIRPLANE 1 Airframe Components 1 Propulsion Systems 4 1.2 REPRESENTATIVE
More informationNon-Synchronous Vibrations of Turbomachinery Airfoils
Non-Synchronous Vibrations of Turbomachinery Airfoils 600 500 NSV Frequency,!, hz 400 300 200 F.R. Flutter 100 SFV 0 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Rotor Speed,!, RPM Kenneth C. Hall,
More informationModeling Helicopter Rotor Blade Flapping Motion Considering Nonlinear Aerodynamics
Copyright c 28 Tech Science Press CMES, vol.27, no.1, pp.2-36, 28 Modeling Helicopter Rotor Blade Flapping Motion Considering Nonlinear Aerodynamics Jyoti Ranjan Majhi, Ranjan Ganguli 1 Abstract: The flapping
More informationNumerical Implementation of a Frequency-Domain Panel Method for Flutter Prediction of a 3D Wing
Numerical Implementation of a Frequency-Domain Panel Method for Flutter Prediction of a 3D Wing Eduardo Manuel Pizarro Gomes Pepe pizarropepe@tecnico.ulisboa.pt Instituto Superior Técnico, Lisboa, Portugal
More informationAeroelasticity & Experimental Aerodynamics. Lecture 7 Galloping. T. Andrianne
Aeroelasticity & Experimental Aerodynamics (AERO0032-1) Lecture 7 Galloping T. Andrianne 2017-2018 Dimensional analysis (from L6) Motion of a linear structure in a subsonic, steady flow Described by :
More informationMatthew Lucas Guertin, 2d Lt USAF
Copyright Matthew Lucas Guertin, 2d Lt USAF 2012 ABSTRACT The Application of Finite Element Methods to Aeroelastic Lifting Surface Flutter by Matthew Lucas Guertin, 2d Lt USAF Aeroelastic behavior prediction
More informationIntroduction to Aerospace Engineering
4. Basic Fluid (Aero) Dynamics Introduction to Aerospace Engineering Here, we will try and look at a few basic ideas from the complicated field of fluid dynamics. The general area includes studies of incompressible,
More informationAeroelasticity. Lecture 4: Flight Flutter Testing. G. Dimitriadis. AERO0032-1, Aeroelasticity and Experimental Aerodynamics, Lecture 4
Aeroelasticity Lecture 4: Flight Flutter Testing G. Dimitriadis AERO0032-1, Aeroelasticity and Experimental Aerodynamics, Lecture 4 1 Main reference A Historical Overview of Flight Flutter Testing, Michael
More informationAPS Flapping flight from flexible wings : tuning of wing stiffness for flight? Tom Daniel, Stacey Combes,, & Sanjay Sane
APS 2004 Flapping flight from flexible wings : tuning of wing stiffness for flight? Tom Daniel, Stacey Combes,, & Sanjay Sane CNS SENSORY INPUT MOTOR OUTPUT FLIGHT MUSCLES FORCE, STRAIN WING HINGE How
More information