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Directional control

(WP4 – Trajectory and Attitude control systems)

Emmanuelle DODANE - Benjamin LAMBERT - Vincent VACHER - Florian ROUSSEAU


Developments in the field of aerospace

during the twentieth century made the

manned space flight feasible. Space

tourism is now a maturing market.

However, constraints as physiological and

the material for this type of flight remain


In this context, actuators which a open as

maximum as possible the flight envelope of

the vehicle are essential.

Our work may bear initially on state

actuators available according to flight

phases. Our work on innovative

technologies used in the microgravity

phase is presented in this article.

Our innovative actuator is composed of a

gas outlet nozzle arranged on a

hemisphere. The outlet of the nozzle is

located at an angle θ


of the main axis of

rotation of the half-sphere. Depending on

the rotational angle 2φ around the z axis,

we obtain a resultant force (blue vector on

the fig) with an adjustable inclination θ

between 0 and θ


. The module of this

resultant force is a function of the degree of

sweep and the module of the initial pushing

force present on the nozzle. To vary the

modulus of the resultant force, the next

step is to achieve more or less time 2φ the

rotation cycle. In this study we calculate the

analytical control laws, as well as the

different possible locations.

In order to improve and refine our

technological choices, we seek to define

the forces applied to our shuttle. For these

studies we used and presented programs

on CFD (fluid flow problems), methods of

current resolutions of the Navier-Stokes

equations and mathematical approaches of

the behavior of turbulences (k, k-ε, k-ω).

These elements allow implementing and

simulating digital models of the vehicle.

Our work allows us, with a simple approach

that remains to refine, to determine areas

of stress concentrations.