공력저항에 따른 wide area munition의 동역학적 거동 해석 = Analysis of dynamic behavior of a wide area munition with aerodynamic effect

다국어 초록 (Multilingual Abstract)

ABSTRACT

Analysis of Dynamic Behavior of a Wide Area Munition with
Aerodynamic Effect


Name: Junho Hong
Department: Mechanical Engineering
Thesis Advisor: Woo Chun Choi


The wide area munition (WAM) investigated in this study is munition that automatically attacks a target. The WAM discharged from platform flies with precession. An IR sensor attached to the WAM draws a specific trajectory on the ground. When a target is detected, the WAM attacks the target from the air. Therefore, the trajectory of IR sensor is important for accurate attack. Aerodynamic effect and precession are important for the trajectory of IR sensor. In this study governing equations about precession were derived, and the WAM pose was determined using numerical analysis method. Also CFD analysis was done to find the drags and moments for each WAM pose for different rotation speeds and wind speeds. Finally, the trajectory of IR sensor and flight are determined with aerodynamic effect considered. Also in order to find tendency of trajectory of IR sensor and flight, numerical analysis is conducted for many variables. It was found that the aerodynamic resistant forces affect the deviation distance and maximum distance, while the aerodynamic resistant moments affect the pose of the WAM.

목차 (Table of Contents)

• CONTENTS
• ABSTRACT……………………………………………………………………i
• CONTENTS……………………………………………………………………ii
• LIST OF FIGURES……………………………………………….. …………..iv
• LIST OF TABLES……………………………………………………………..vii
• NOMENCLATURE………………………………………………. …………..viii
• 1 서 론
• 1.1 연구 대상………………………………………………………..……………….....1
• 1.2 연구 동향………………………………………………….……..……………..…..6
• 1.3 연구 목적………………………………………………….……..…………………7
• 2 본 론
• 2.1 비행체 제원……………………………………………………….………………..8
• 2.2 지배방정식
• 2.2.1 오일러각……………………………………………………………………..10
• 2.2.2 각속도……………………………………………………………..………....12
• 2.2.3 각운동량…………………………………………………………………......13
• 2.2.4 모멘트………………………………………………………………………..15
• 2.3 FEM 해석
• 2.3.1 해석 모델과 해석 조건................................................................................17
• 2.3.2 회전속도에 따른 경향성..............................................................................19
• 2.3.3 비행속도에 따른 경향..................................................................................24
• 2.4 공력저항을 고려한 수치해석
• 2.4.1 수치해석.........................................................................................................29
• 2.4.2 HTM………………………………………………………………………....40
• 2.4.3 Footprint………………………………………..............................................42
• 2.4.4 공력저항에 따른 변화 비교.......................................................................44
• 2.5 경향성
• 2.5.1 변수 정의.......................................................................................................52
• 2.5.2 발사각…..…………………………………………………….…………......54
• 2.5.3 틸팅각…....……………………………………………………………….....57
• 2.5.4 스핀각.............................................................................................................60
• 2.5.5 회전속도.........................................................................................................64
• 3 고 찰 ...……….………………………………………………………………………68
• 4 결 론 …...…………………………………………………………………………….69
• 5 부 록 …...…………………………………………………………………………….71
• 6 참고문헌 …...………………………………………………………………………….86