Research on control force of parafoil based on fluid structure interaction method
The control force of the parafoil represents a crucial indicator in the selection of servo motors for precision airdrop systems.This paper proposes an Arbitrary Lagrange Euler(ALE)-based method for calculating the control force of the parafoil.The method is demonstrated through calculations of the control force within different control strokes.The calculated results are consistent with the experimental result,with the error being less than 5%.On this basis,the coupling mechanism and dynamic change law of the control force under the airdrop condition are investi-gated.It is found that the control force reaches the maximum when the control rope is pulled down to the target control stroke,and then gradually decreases until it reaches a steady state.The influence of control parameters on control force is examined.The findings indicate that when the control speed is fixed,an increase in control stroke results in a rise in both maximum control force and steady-state control force,but a decline in the control force rising rate.When the control stroke is held constant,an increase in control speed results in an increase in maximum control force,while the steady-state control force remains almost unchanged.In comparison to the control stroke,the control speed has less influence on the maximum control force.The findings of this study can provide a theoretical foundation for the de-sign of the parafoil control rope and the selection of servo motor.
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