Implementing the speed of wind into an aircrafts 6 DOF model

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Omar Al Merri
Omar Al Merri 2024-1-15
回答： Benjamin Thompson 2024-1-20
Hello, I have a simple 6 DOF model of an aircraft using the 6 DOF (Euler angles) block in simulink alongside the Aerodynamic Forces and Moments block, I am simulating a trajectory drop (free fall) of the aircraft. I was asked to include the effect of varying wind speed and sideslip angle on the trajectory. Wanted to know how to incorporate this into the model. Do I add it as a force into the Aerodynamic forces and moments block? Do I subtract the force factor that is on the x axis from the aircrafts speed everytime it leaves the 6dof block and before it is used to calculate the aerodynamic forces via the block. Any recommendations are greatly appreciated. If any extra information is needed I am ready to supply.
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Omar Al Merri
Omar Al Merri 2024-1-15
Hello @Sam Chak, using the 6DOF block for my equation of motion, its inputs are forces and moments which are the outputs of the Aerodynamic forces and moments that I have supplied to the aerodynamic coefficients. Setting the initial condition (altitude and velocity) in the 6 dof initial parameters allows me to see the trajectory of the aircraft as it free falls. There are no control surfaces stall implemented.
Sam Chak
Sam Chak 2024-1-15
Hi @Omar Al Merri,
As you mentioned, the block takes of Forces and Moments. Can you convert the Wind Velocities into a force vector and a moment vector ?

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Benjamin Thompson
Benjamin Thompson 2024-1-20
You would set the Aerodynamic Forces and Moments block mask parameter or Input Axes to Wind. Then you get a fifth input to the block which you must calculate as the velocity of the body with respect to the wind.

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