Work with Fixed-Wing Aircraft Using Functions
To easily create fixed-wing aircraft in the Aerospace Toolbox, use the
function and its supporting functions. Use these functions to:
Define aircraft dynamics.
Define aircraft dynamics from DATCOM files.
Perform static stability analyses using object methods.
Generate state-space representation with linearization methods.
Consider this workflow when designing and building your fixed-wing aircraft objects with these functions.
Define a fixed-wing aircraft.
Define the condition (state) of a fixed-wing aircraft at an instance in time.
Define data for any and all coefficients that describe the behavior of the aircraft.
Define an aerodynamic surface on a fixed-wing aircraft.
Define a thrust vector on a fixed-wing aircraft.
Define the fixed-wing aircraft state environment.
Define the properties for the fixed-wing aircraft.
After creating these fixed-wing aircraft components, use object methods to work with them. For example, use object methods to perform static stability and linear analysis.
Static Stability Analysis
To perform static stability analysis of your fixed-wing aircraft, use associated object methods:
Create a criteria table against which to perform static stability analysis.
To create a criteria table, use the
Aero.FixedWing.criteriaTablemethod. This method creates a 6-by-N 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 the
staticStabilitymethod. 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
staticStabilitymethod does not perform a requirements-based analysis.
For more information on object methods, see Analyze Fixed-Wing Aircraft with Objects.
For an example of static stability analysis, see Determine Nonlinear Dynamics and Static Stability of Fixed-Wing Aircraft .
To perform the linear analysis of the fixed-wing object at a given fixed-wing state, use
This method linearizes a fixed-wing aircraft around an initial state and creates a
state-space model for the linear analysis. To perform linear analysis:
For an example of fixed-wing aircraft linear analysis, see Analyze State-Space Model for Linear Control and Static Stability Analysis.
Linear analysis requires the Control System Toolbox™ license.