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Development of Rotor Structural Design Optimization Framework for Compound Rotorcrafts with a Lift Offset : Lift offset 복합형 회전익기의 로터 구조 최적설계 프레임워크 개발 연구
DC Field | Value | Language |
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dc.contributor.advisor | 신상준 | - |
dc.contributor.author | 임재훈 | - |
dc.date.accessioned | 2017-07-13T06:14:58Z | - |
dc.date.available | 2017-07-13T06:14:58Z | - |
dc.date.issued | 2014-08 | - |
dc.identifier.other | 000000020836 | - |
dc.identifier.uri | https://hdl.handle.net/10371/118387 | - |
dc.description | 학위논문 (박사)-- 서울대학교 대학원 : 기계항공공학부, 2014. 8. 신상준. | - |
dc.description.abstract | Design optimization for the structural construction of a rotor system in a compound rotorcraft with a lift offset was conducted by applying a two-level procedure. In this optimization process, enhancements were made regarding the high-speed forward flight capability, vibration characteristics, and rotor blade weight of a compound rotorcraft. In this type of rotorcraft, the combination of a lift offset, a rigid rotor blade, and a variable rotor speed enables the achievement of satisfactory vibration characteristics and high forward speed performance. Optimized structural properties of the blade and chordwise geometries for each blade radial station were obtained by the present upper-level optimization scheme. By applying the proposed lower-level optimization scheme, an optimized cross-sectional configuration of a composite rotor blade was determined. For validation purposes, the design of an existing stiff-in-plane rotor in XH-59A compound rotorcraft was optimized by applying the present procedure. As a result, it was found that most of the objective function values were significantly improved. The influence of the optimization results on the conceptual design was evaluated. It is expected that the present procedure will be applicable for the next-phase advanced compound rotorcraft, which will target further high forward speed capability with low vibration characteristics. | - |
dc.description.abstract | 본 논문에서는 Lift offset 로터와 보조추진장치가 장착된 복합형 회전익기의 로터 최적설계 프레임워크를 2 단계의 형태로 개발하였다. 개발된 최적화 프레임워크에 의해 고속전진비행에서의 복합형 회전익기의 성능, 진동, 중량이 향상되었다. lift offset 복합형 회전익기는 lift offset, 강성이 높은 로터 블레이드, 로터 회전속도 변화 등의 다양한 요소가 진동과 성능에 미치기 영향 때문에, 진동과 성능 모두를 만족시키는 설계를 도출하는 것이 난이하다. 상위 최적설계에서는 로터 블레이드의 최적화된 물성치와 시위길이가 도출된다. 상위 최적설계 프레임워크에서 도출된 시위길이, 질량 및 강성 값을 가지는 복합재 블레이드 단면의 설계가 하위 최적설계에서 수행되었다. XH-59A 복합형 회전익기의 자료를 이용하여 개발된 최적설계 프레임워크를 이용한 최적설계를 수행하였다. 그 결과 대부분의 목적함수가 상당히 향상되었음을 확인하였다. 로터 최적설계 결과가 회전익기 개념설계 결과에 미치는 영향을 알아보기 위해 lift offset 복합형 회전익기의 개념설계가 수행 가능한 개념설계 프레임워크가 개발되었다. 이를 이용하여 로터 최적설계 결과가 개념설계에 미치는 영향을 확인하여 본 결과 향상된 로터 성능 및 중량으로 인해 총 중량이 감소한 회전익기가 설계됨을 확인하였다. | - |
dc.description.tableofcontents | Abstract
Contents List of Tables List of Figures Chapter 1 Introduction 1.1 Background and Motivation 1.2 Previous Researches 1.2.1 Previous Researches on Rotor Design Optimization 1.2.2 Previous Researches on Development of a Conceptual Design Program for a Compound Rotorcraft 1.3 Objectives and Thesis Overview Chapter 2 Rotor Design Optimization Framework for a Lift Offset Compound Aircraft 2.1 Upper-Level Optimization 2.2 Lower-Level Optimization Chapter 3 Improvement Strategy on HCDO Program to Include a Design Capability for a Compound Rotorcraft with a Lift Offset 3.1 Improvement on the Power Required Estimation Algorithm 3.2 Improvement on the Estimation of Flat Plate Drag Area Chapter 4 Design Optimization Results 4.1 Validation of CAMRAD II Input 4.2 Parametric Study of the Lift Offset 4.3 Sensitivity Test to select Design Variables 4.4 Development of an Approximate Model using RSM 4.5 Upper-Level Optimization 4.6 Lower-Level Optimization Chapter 5 Influence of the Optimization Results on the Conceptual Design 5.1 Development of Rotor Map 5.2 Influence Verification of the Optimization Results on the Conceptual Design Chapter 6 Conclusions References Appendix A. Helicopter Conceptual Design and Optimization Framework Abstract (Korean) | - |
dc.format | application/pdf | - |
dc.format.extent | 7176247 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | 로터 구조 설계 | - |
dc.subject | 최적화 | - |
dc.subject | Lift Offset 복합형 회전익기Rotor Structural Design | - |
dc.subject | Optimization | - |
dc.subject | Compound Rotorcraft with a Lift Offset | - |
dc.subject.ddc | 621 | - |
dc.title | Development of Rotor Structural Design Optimization Framework for Compound Rotorcrafts with a Lift Offset | - |
dc.title.alternative | Lift offset 복합형 회전익기의 로터 구조 최적설계 프레임워크 개발 연구 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | JaeHoon Lim | - |
dc.description.degree | Doctor | - |
dc.citation.pages | ix, 150 | - |
dc.contributor.affiliation | 공과대학 기계항공공학부 | - |
dc.date.awarded | 2014-08 | - |
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