Analyze FixedWing Aircraft with Objects
To analyze fixedwing aircraft in Aerospace Toolbox, use the Aero.FixedWing
class
and its supporting classes. These classes enable you to:
Define aircraft dynamics
Define aircraft dynamics from DATCOM files
Perform static stability analyses
Generate statespace representation with linearization methods
Suggested Workflow
As a guideline, consider this workflow when designing and building your fixedwing aircraft with these classes:
To  Use 

Define a fixedwing aircraft. 

Define the condition (state) of a fixedwing aircraft at an instance in time. 

To define data for any and all coefficients that describe the behavior of the aircraft.  Aero.FixedWing.Coefficient — Aero.FixedWing.Coefficient
objects hold the data for all Coefficients that describe the behavior of the
aircraft. 
Define an aerodynamic surface on a fixedwing aircraft. 

Define a thrust vector on a fixedwing aircraft. 

Define the fixedwing aircraft state environment. 

Define the properties for the fixedwing aircraft. 

To define the control states of a fixedwing state.  Aero.Aircraft.ControlState — Aero.Aircraft.ControlState
holds the definitions of the aircraft control surface deflection angles. 
Static Stability Analysis
To perform static stability analysis of your fixedwing aircraft:
Create a criteria table against which to perform static stability analysis.
To create a criteria table, use the
Aero.FixedWing.criteriaTable
method. This method creates a 6byN table, where N is the number of criteria variables.To evaluate the changes in forces and moments after a perturbation as either greater than, equal to, or less than 0 using the matching entry in the criteria table, use
staticStability
method. The method uses this evaluation process:If the evaluation of a criteria is met, the aircraft is statically stable at that condition.
If the evaluation of a criteria is not met, the aircraft is statically unstable at that condition.
If the result of the perturbation is
0
, the aircraft is statically neutral at that condition.
Use this method only in the preliminary design phase. The
staticStability
method does not perform a requirementsbased analysis.
For an example of static stability analysis, see Determine Nonlinear Dynamics and Static Stability of FixedWing Aircraft .
Linear Analysis
To perform the linear analysis of the fixedwing object at a given fixedwing state, use
the linearize
method.
This method linearizes a fixedwing aircraft around an initial state and creates a
statespace model for the linear analysis. To perform linear analysis:
Calculate the static stability of the fixedwing aircraft using the
staticStability
method.Linearize the fixedwing aircraft using the
linearize
method.
For an example of fixedwing aircraft linear analysis, see Analyze StateSpace Model for Linear Control and Static Stability Analysis.
Linear analysis requires the Control System Toolbox™ license.
Examples
Aerospace Toolbox provides these examples to help you work with fixedwing aircraft using the fixedwing classes.
Action  Example 

Create and analyze a fixedwing aircraft in MATLAB using Cessna C182 geometry and coefficient data.  Determine Nonlinear Dynamics and Static Stability of FixedWing Aircraft 
Convert a fixedwing aircraft to a linear time invariant (LTI) statespace model for linear analysis.  Analyze StateSpace Model for Linear Control and Static Stability Analysis 
Construct and define a custom state for a fixedwing aircraft.  Customize FixedWing Aircraft with Additional Aircraft States 
See Also
Aero.Aircraft.ControlState
 Aero.Aircraft.Environment
 Aero.Aircraft.Properties
 Aero.FixedWing
 Aero.FixedWing.Coefficient
 Aero.FixedWing.State
 Aero.FixedWing.Surface
 Aero.FixedWing.Thrust