Equations to program (6): Thrust
M
Equations to program (7):
angle of attack (autopilot)
−=
−−−=
D
D
dt
dI
Ikk
)(
210
Homework Assignment 14:
Run Objectives and Required Output
Run 1: Testing the program. You do not have to hand anything in. The values for
should be about the same as they were for the phase 1 run (within 5% of
values in instructor’s solution).
Run 4: Determining max speed with afterburner. Hand in the graph of Vvs time and
the data page showing Vat the end of the run.
,,Vh
Homework Assignment 14:
Run 1 Parameters (Test Case)
Initial conditions: Flight profile:
Thrust:
0)0(
=
h
25.0=
3
01070xT =
Homework Assignment 14:
Run 2 Parameters (Ceiling)
Initial conditions: Flight profile:
Thrust:
0)0(
=
h
15.0=
D
3
01070xT =
Homework Assignment 14:
Run 3 Parameters (Max Speed “Dry”)
Initial conditions: Flight profile:
Thrust:
01070xT =
Homework Assignment 14:
Run 4 Parameters (Max Speed “Wet”)
Initial conditions: Flight profile:
Thrust:
1035)0( 3
=
xh
0=
D
Homework Assignment 14:
Run 5 Parameters (Time to Climb)
Initial conditions: Flight profile:
Thrust:
*Develop a flight profile schedule ( vs time) to reach 45 kft altitude
and M 1.8 in 520 seconds or less. What is the minimum time to climb
you can achieve?
D
Comments on Equation for Angle of Attack
(Autopilot)
The model ignores “short period” dynamics. The pilot or autopilot
actually controls the elevator (a movable surface on the tail) to
control angle of attack. We will examine “short period” dynamics
later in the course.
In the angle of attack equation the term provides steady state
*Helpful Hints on User-Defined Functions
For functions requiring “if then else” logic, taking the desired flight path
angle function as an example, write
If t < t1 then
return a
else
return z
endif
*Helpful Hints on User-Defined Functions (2)
Ensure that the number of “If” statements equals the number of
“endif” statements.
Homework Assignment 14: Due Date
Due: