Term Project Presentation on Dec. 9
(To volunteer, drag and drop your slides as images
by 23:59 pm, Sat, Nov. 30, 2019.)
● 6-page limit including the title page.
● You will later have a chance to modify your slides
if selected to present.
● DO NOT MAKE DOCUMENT-WIDE CHANGES SUCH AS CHANGING THE MASTER BACKGROUND!
Student Name: 유진우
Student Name : 곽호성
Student name: 김도연
Student name: 변성민
Student name: 고광현
Student name: 김형모
Student name: 고성민
Student Name: 김성수
Dancing t-handle
2019-19668 김성수
Dancing t-handle
EOM
EOM
NUTATION PERIOD
초기 각속도에 반비례
초기 각속도에 반비례 각운동량의 미소 변화량에 의존하지 않음
NUTATION PERIOD
p=I2/I3 에 대해 복잡한 형태로 증가
Student Name : 백두현
Student Name: 황준상
우주선의 궤도
물리천문학부 황준상
고려할 점
지구 중심 궤도
달 탐사 궤도
화성 탐사 궤도
감사합니다
Student name: 김기완
Student name: 김현용
우주항공공학과 2018-19828 김현용
Calculating The Trajectory
Including The Coriolis force with python!
Missile and Rocket
Recap: Coriolis Effect
Problem 10.18�Battle of the Falkland Islands
Problem 2.6-bale of hay
Coriolis Effect In Neutron star
Student name: 황은오
Student name: 김다솔
Student name: 박희인
Terminology
•Euler angles
•Reference Frames
Equations of Motion
Dynamic Characteristics of Aircrafts
•Longitudinal: Short Period & Phugoid
•Lateral: Spiral, Rolling, Dutch Roll
•https://www.youtube.com/watch?v=Zmjam1evDD4
Including Feedback Control
•Control Surface depends on attitude
•Kind of passive Control System
•https://www.youtube.com/watch?v=XWhGjxdug0o
Student name:김태호
� Thermal Conduction in 2D Lattice Using the Loaded String Model
Dept. of Physics & Astronomy
Taeho Kim
https://www.youtube.com/watch?v=OoKDC1AMMwg
https://www.youtube.com/watch?v=OoKDC1AMMwg
MATLAB!!
https://www.youtube.com/watch?v=OoKDC1AMMwg
https://www.youtube.com/watch?v=OoKDC1AMMwg
https://www.youtube.com/watch?v=OoKDC1AMMwg
p=0.15
https://www.youtube.com/watch?v=OoKDC1AMMwg
Q&A
Thank You!
Student Name : 김재환
More Examples and Codes are in Github: https://github.com/sshskjh/Physics-Engine
Student name: 조성주
Student Name: 고상범
Stability and Modes of Aircraft’s Oscillatory Motion,
and How to Counteract
Dept. of Physics and Astronomy
Ko Sang Bum
2019.12.9
Lift and Basic Aircraft Structure
Caused by pressure difference
Depends on Angle of Attack (AOA)
Acts on Center of Pressure (CP)
CP moves forward as AOA increases
Fuselage, Wing, Vertical and Horizontal Stabilizers
Lift, Drag, Weight, Thrust: 4 Forces
Rotates about COM, Torques on each CPs
Pitch: Elevators Roll: Ailerons Yaw: Rudders
From FAA Pilot’s Handbook of Aeronautical Knowledge, Public Domain
Lift
Aircraft Structure
(Only for Airfoils)
Longitudinal (Pitch) Oscillatory Motion
Long Period Mode, Big Altitude Change
Exchange between potential energy and kinetic energy
Very small damp, easy to counter
Dangerous when left uncontrolled
Shorter period.
Heavily damped primarily due to horizontal stabilizers
Least concern for pilot
Phugoid Mode
Short Period Mode
Phugoid osc., From Wikipedia user “Andrzejmat”, released as Public Domain
Lateral (Roll & Yaw) Motion Modes and Coupling
Role Damping Mode
Damp of high roll rate
No restoration force
Spiral Mode
Coupled, Divergent or poorly damped
Slow buildup, easy to counter
Dangerous when unattended
Dutch Roll Mode
Coupled, cause dizziness
In straight wings, heavily damped In other wings, small damp or no damp
Stressful to counter
Small Period
From Wikipedia user, “Picascho”, released as Public Domain
Pilot’s Actions and Instruments to Damp Motions
Wrong technique can worsen the Motions!!!
Do NOT blindly Counteract the displacement!
Expect lag
Sometimes rough control input creates another oscillations
Engine effects (torques, airflows) considered
Instruments such as Roll Dampers and Fly by Wire system (computer assist) help pilots
Example of technique. US Air Force, Public Domain
Conclusion (and other materials)
Longitudinal:
Lateral:
Some simplification
Is possible.
Equations of Motion: , where normal modes are from: =0 where Matrices are:
Student name : 이정현
Order of magnitude: λ~ 2cm~2m
Student Name: 박진우
Student Name : 정승원
N=1, 111Hz(max)
N=2, 68Hz(max)
N=3, 49Hz(max)
N=4, 38Hz(max)
N=5, 31Hz(max)
N=6, 30Hz(max)
N=7, 24Hz(max)
N=8, 21Hz(max)
Student name : 권의준
Student name: 서원우
Student name: 이강민
Student name: 손호성
Student name: 이준영
How does a Sphere Oscillate?
Hydrodynamics in solar interior
Nodes and normal mode
Python Plot: Solar model
Lamb & Buoyancy Frequency
Oscillation Modes
Student name: 정정우
여기까지 쓸게요
Student name: 김한솔
Student name: 심진우
Student name: 정은우
Student name: 김세훈
Motion of the Tippe Top
물리천문학부 2018-19745 김세훈
What is the Tippe Top?
-구 모양의 몸통과 막대기 모양의 손잡이를 가진 팽이
-팽이를 돌리면, 대칭축이 서서히 기울어지고, 결국, 뒤집어진 채로 돌게 된다.
step1-
-유효 퍼텐셜
step2-
-오일러 운동 방정식
step3-
-유효 퍼텐셜
Conclusion
-유효 퍼텐셜 그래프를 이용해 Tippe Top의 운동을 설명할 수 있었다.
-step1에서 유효 퍼텐셜로부터 θ가 증가하는 것을 확인하였다.
-step2에서 Tippe Top이 뒤집어질 조건을 확인하였다.
-step3에서 유효 퍼텐셜로부터 θ가 증가하다 감소하는 것을 확인하였다.
-마찰력을 고려한다면 보다 정확한 논의가 가능하다.
Student name: 김상하