Flight Mechanics - From Theory to Certification of Aircraft

This lesson we will start creating our first simulink library, the Atmospheric one. The anemometrics and ISA model we learned are going to be implemented in Simulink. The version of Matlab 2016a is the one used. But if you follow the step-by-step instructions you can use any version.

Now it's time to implement our forces and moments computations through the Equations of Motion library, let's start by the first subsystem: Forces and Moments.

The next subsystem of the Equations of Motion library is the Body Rates.

In this lesson we will continue working on the Equations of Motion library, now it's time for the Euler Angles subsystem.

The last subsystem of the Equation of Motion  library is with regards to trajectory data. The trajectory angle gamma and the track angle of the aircraft will be calculated as well as the ground speed.

Finally, we will finish the Equations of Motion library.

In this lesson we will edit the Atmospheric library to insert the wind effect, calculate the angle of attack and the sideslip angle.

This lesson is a quick one. We are going to create the Propulsion library with the generic model we studied in the Section 1.

Now we start to work on our last library, the Aerodynamics one. In this lesson we'll introduce the inputs and the CL calculation.

The other coeffcients will be proposed as a challenge in task 3.

Now that all coeffcients have been calculated we have to convert them from the stability axis to the body axis. After that we will transform the coefficients in forces and moments. Additionally, for the moments which have been derivied in relation to a standard position of 25% of the mean aerodynamic chord (%mac), we will correct them and account for the actual CG position (x_cg, y_cg and z_cg) of the aircraft.

This is the last lesson of this section. We will combine all the previous libraries and create the Aircraft (ACFT) model.

This is the data for a generic Executive jet at low speed and at high speed cruise configuration.

All aerodynamic data have been derived for the stability axis.

These files will be used in all future examples and exercises.

Other aircraft data are available at several different references (see one below) and you are encouraged to change the data and check the effects on the dynamics for different type of aircraft yourself. Share your results, analyses and doubts.

Airplane Flight Dynamics and Automatic Flight Controls Pt. 1 - Jan Roskam

- Understanding the trim script

- Longitudinal trim

- Lateral trim

Time varying simulations starting from a trimmed condition.

In this lecture you'll learn how to use matlab optimizer functions "fmincon"and "fminsearch" to adjust the aerodynamic derivatives and have a model that matches flight test results. Two examples are provided for download, one for the dutch roll maneuver (with an example on the video lecture) and a longitudinal one for the short period/phugoid motion.

In this lecture you'll learn how to read USB Joystick inputs in Simulink and Export the data to a flight simulation tool such as Flight Gear.

Download Flight Gear before this class on the following link:
https://www.flightgear.org/download/

• Introduction to the Subpart B 14 CFR FAA Part 25 requirements

• Introduction to Advisory Circulars as means of compliance

• Examples of compliance demonstration

• Examples of Flight Tests conducted during a certification campaign.

This section we are going to cover the basic principles of fly-by-wire aircraft, its advantages and most common control laws.