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Various Structural Approaches to Analyze an Aircraft with High Aspect Ratio Wings
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Cho, Maenghyo | - |
dc.contributor.author | Anas El Arras | - |
dc.date.accessioned | 2017-07-14T03:46:23Z | - |
dc.date.available | 2017-07-14T03:46:23Z | - |
dc.date.issued | 2013-02 | - |
dc.identifier.other | 000000008136 | - |
dc.identifier.uri | https://hdl.handle.net/10371/123969 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부(멀티스케일 기계설계전공), 2013. 2. Cho, Maenghyo. | - |
dc.description.abstract | Aeroelastic analysis of an aircraft with a high aspect ratio-wing for medium altitude and long endurance capability was attempted in this thesis. In order to achieve such objective, various structural and aerodynamic models were adopted. The traditional approach has been based on an Euler-Bernoulli beam structural model. In addition to that, a geometrically non-linear beam model was adopted. The structural analysis results of the present beam models were obtained and later compared with those by three-dimensional NASTRAN finite element model. The relevant unsteady aerodynamic forces were acquired by two methods. First, a finite state dynamic inflow unsteady aerodynamics model was developed and evaluated. Second, ZAERO, which is based on the doublet-lattice method, was used. These two kinds of aerodynamic forces were compared, and applied to the foregoing flutter analysis. For instance, the structural mode shapes and natural frequencies from both the Euler-Bernoulli beam structural model and the three-dimensional finite element model were transferred to ZAERO, which used the DLM aerodynamics to estimate the flutter. Similarly, flutter prediction was conducted by combining the Euler-Bernoulli beam structural model and the finite state dynamic inflow unsteady aerodynamics. The next phase of the present research will deal with the analysis of the possible interaction between the rigid-body degrees of freedom and the aeroelastic modes. | - |
dc.description.tableofcontents | Chapter 1. Introduction 1
1.1 MALE Aircraft 1 1.2 Background and Motivation 4 1.3 Research Objectives and Approach 10 1.4 Thesis Organization 11 Chapter 2. Structural Modeling 14 2.1 Euler-Bernoulli Beam Structural Model 14 2.2 Three-Dimensional Finite Element Model 19 2.3 Geometrically Non-Linear Beam Model 21 Chapter 3. Aerodynamic Modeling 28 3.1 Doublet Lattice Method (DLM) 28 3.2 Finite State Dynamic Inflow Unsteady Aerodynamics 31 Chapter 4. Flutter Modeling 38 4.1 Flutter Prediction Based on the Euler-Bernoulli Beam Structural Model and DLM 39 4.1.1 The k-Method 41 4.1.2 The g-Method 42 4.1.3 Wing Flutter Analysis 44 4.1.4 Complete Aircraft Flutter Analysis 45 4.2 Flutter Prediction Based on the Geometrically Non-linear Beam Model and Finite State Dynamic Inflow Unsteady Aerodynamics 45 4.2.1 Steady-state Response 47 4.2.2 Perturbed Response 47 Chapter 5. Numerical Results 51 5.1 Structural Analysis 51 5.1.1 Cross-sectional Analysis 51 5.1.2 Free Vibration Analysis 52 5.1.3 Mass Density Optimization and Improved Free Vibration Analysis 54 5.2 Aerodynamic Analysis 56 5.3 Flutter Analysis 57 Chapter 6. Conclusion and Future Works 79 6.1 Summary 79 6.2 Future Works 80 References 83 Abstract (Korean) 90 | - |
dc.format | application/pdf | - |
dc.format.extent | 1826002 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | High aspect-ratio wings | - |
dc.subject | Euler-Bernoulli Beam Structural Model | - |
dc.subject | Three Dimensional Finite Element Model | - |
dc.subject | Geometrically Non-Linear Beam Model | - |
dc.subject | Doublet-Lattice Method | - |
dc.subject | Finite State Dynamic Inflow Unsteady Aerodynamics | - |
dc.subject | Flutter Analysis | - |
dc.subject.ddc | 621 | - |
dc.title | Various Structural Approaches to Analyze an Aircraft with High Aspect Ratio Wings | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.citation.pages | 98 | - |
dc.contributor.affiliation | 공과대학 기계항공공학부(멀티스케일 기계설계전공) | - |
dc.date.awarded | 2013-02 | - |
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