AE 3521 Aircraft & Spacecraft Flight Dynamics

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Nov 16, 2013 (3 years and 4 months ago)

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AE 3521: AIRCRAFT AND SPACECRAFT FLIGHT DYNAMICS (4
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Catalog Description:
AE 3521: AIRCRAFT AND SPACECRAFT
FLIGHT
DYNAMICS
. Three
-
dimensional rigid body dynamics, aircraft and spacecraft equations
of motion, principles of static stability and contr
ol, dynamic stability of uncontrolled
motion, gyroscopic instruments.




Texts:

W.E. Wiesel,
Space Flight Dynamics
, 2nd Edition, McGraw
-
Hill, 1997



R.C. Nelson,
Flight Stability and Automatic Control
., McGraw
-
Hill Co
.


Course Coordinator:

Prof. P.
Tsiotras


Learning Objectives:

This course is designed to give juniors in aerospace engineering
a foundational understanding of dynamics and stability of aerospace vehicles. The
course will introduce the basic concepts for understanding how aircraft fly a
nd
maneuver, how spacecraft orbit the planets, what affects their stability and attitude, and
how their motion can be controlled.


Expected Outcomes:
Students will be able to analyze the motion of aircraft and
spacecraft; they will understand the torque ef
fect of the change of angular momentum
on rotating vehicles and structures. The students will become familiar with the operating
principles of spin
-
stabilization and gravity
-
gradient stabilization for orbiting spacecraft,
the use of thrusters, momentum and

reaction wheels and CMG’s to control the motion
of spacecraft. They will also learn the principles of the rate and integrating gyros and of
inertial navigation. They will understand stability derivatives and their effect on the
aircraft motion. Will lear
n how to size the aerodynamic surfaces (ailerons, rudders,
elevator) to achieve required torques on aircraft and will learn the basic natural modes
of uncontrolled aircraft motion.



Prerequisites:

AE 2020, AE 3515, or consent of the School.



Lecture To
pics:


1.

Introduction:



Vectors, Frames, Newton’s Law







1

2.

General equations of motion:







7



Acceleration Formula




Elementary Rotations; Euler Angles



Attitude Kinematics



Rigid Body Dynamics

3.

Spacecraft attitude dynamics:







6



Euler’s Equation,



Moments of Inertia, Steiner’s Theorem



Torque
-
free rigid body motion; Poinsot construction; Polhodes

4.

Spacecraft stability and control:






10


Definitions of stability, equilibrium points


Review of 2
nd

order linear differential eq
uations



Stability of permanent rotations for a spacecraft



Motion of spinning top; stability of top about local vertical



Momentum bias spacecraft; dual
-
spin spacecraft



Reaction wheels, thrusters, spin
-
stabilization



Control Moment Gyroscopes (CMGs
)



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B
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2



Gravity
-
gradient stabilization

5.

Gyroscopic instruments






5


Rate gyros and integrating gyros


Inertial platform; inertial navigation

6.

Aircraft dynamics







6


Nomenclature; Body
-
axes and Wind
-
axes definitions


Definition of stability derivatives


Definitions of angle of attack and sideslip angle


Equations of motion for an a/c


Gravitational and thrust forces


Effect of spinning rotors

7.

Small disturbance theory







8


Linearization


Stability derivatives; derivatives due to velocity; derivatives d
ue to pitching
velocity


derivatives due to AoA; derivatives due change in the AoA; derivatives due to
rolling


and yaw rates

8.

Aircraft static stability and control






5

Longitudinal static stability; stick
-
fixed neutral point

Longitudinal control; eleva
tor effectiveness

Directional static stability; weathercock stability; directional control; rudder
sizing

Roll stability; roll control

9.

Aircraft dynamic stability







8


Stability of uncontrolled motion


Longitudinal modes and approximations


Influence of

stability derivatives on longitudinal modes


Lateral Modes and approximations


Elements of automatic flight control and stability augmentation systems

10.

Aircraft flying qualities, aircraft classification, flight phase classification




1

11.

Tests








3


To
tal








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