A basic UAV design. The Computer-Aided Design ('CAD') files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Stallion 3D has built-in capabilities and features that makes it an ideal aerodynamics analysis & design tool for conventional or unconventional unmanned aerial vehicles. Stallion 3D is an aerodynamics conceptual & preliminary design and analysis software for unmanned aerial vehicles (UAV) wings and control surfaces.
- Uav Design software, free download For Windows 7
- Uav Design software, free download Windows 7
- Uav Design software, free download. software
Simulation models often need different levels of fidelity during different development stages. During the rapid-prototyping stage, we would like to quickly experiment and tune parameters to test different autonomous algorithms. During the production development stage, we would like to validate our algorithms against models of increasing fidelities. In this example, we demonstrate a method to approximate a high-fidelity model with the UAV Guidance Model block and use it to prototype and tune a waypoint following navigation system. See Tuning Waypoint Follower for Fixed-Wing UAV. The same navigation system is tested against a high-fidelity model to verify its performance.
The example model uses a high-fidelity unmanned aerial vehicle (UAV) model consisting of a plant model and a mid-level built-in autopilot. This model contains close to a thousand blocks and it is quite complicated to work with. As a first step in the development process, we created a variant system that can switch between this high-fidelity model and the UAV Guidance Model block. The high-fidelity model is extracted from a File Exchange entry, Simulink Drone Reference Application.
UAV model of different fidelity
You can switch between the low and high-fidelity models by changing a MATLAB® variable value stored in the data dictionary associated with this model.
Approximate high-fidelity fixed-wing model with low-fidelity guidance model
Mozilla firefox free download. To approximate the high-fidelity model with the UAV Guidance Model block, create step control signals to feed into the model and observe the step response to
RollAngle
, Height
, and AirSpeed
commands.First, command a change in roll angle.
Zooming into the simulation result above, you see the characteristics of the roll angle controller built into the high-fidelity model. The settling time for the roll angle is close to 2.5 seconds.
For a second-order PD controller, to achieve this settling time with a critically damped system, the following gains should be used to configure the UAV Guidance Model block inside the low-fidelity variant of the UAV model. For this example, the UAV Guidance Model block is simulated using code generation to increase speed for multiple runs. See the block parameters.
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Set the new gains and simulate the step response for the low-fidelity model. Compare it to the original response.
The low-fidelity model achieves a similar step response. Similarly, we can tune the other two control channels:
Height
and AirSpeed
. More sophisticated methods can be used here to optimize the control gains instead of visual inspection of the control response. Consider using System Identification Toolbox® to perform further analysis of the high-fidelity UAV model behavior.Test navigation algorithm with low-fidelity model
Now that we have approximated the high-fidelity model with the UAV Guidance Model block, we can try to replace it with the UAV Guidance Model block in the Tuning Waypoint Follower for Fixed-Wing UAV example. Test the effect of the lookahead distance and heading control gains against these models of different fidelities.
Validate with high-fidelity model
Conclusion
This example shows how we can approximate a high-fidelity model with a low-fidelity abstraction of a fixed-wing UAV. The opposite approach can be used as well to help with choosing autopilot control gains for the high-fidelity model. You can first decide acceptable characteristics of an autopilot control response by simulating a low-fidelity model in different test senarios and then tune the high-fidelity model autopilot accordingly.
See Also
UAV Guidance Model |
fixedwing
| multirotor
Uav Design software, free download For Windows 7
Related Topics
- Simulink Bus Signals (Simulink)
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