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Download Fin Guidance for Atmospheric Rockets by Woodward Stanford PDF

By Woodward Stanford

Ever considered development your individual suborbital?

With the predicted unlock of the D-Beta rocket (a scaled down model of the Daedalus PSC system), we're making to be had this paper on a assistance set of rules for atmospheric rockets, utilizing a servo-driven fin approach. seeing that this rocket will continually be in the surroundings, we will use a simplified procedure utilizing fin deflections to supply steerage and roll negation.

2015 © Woody Stanford DBA Stanford structures. word that public distribution of this white paper is permissible yet nonetheless represents the highbrow estate of Stanford platforms.

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Extra resources for Fin Guidance for Atmospheric Rockets

Sample text

The unit vector ai defines the spinning direction for the ith wheel. The force vector F j defines an external force j, for example, due to a jet firing. The displacement dj represents the distance between the force Fj application point, and the vehicle CG. 5 Typical Reaction Wheel with Control Electronics the RW assembly spin column vectors ai together we can create a transformation matrix Cwb that transforms the wheel momentum from individual wheel axis to the spacecraft body axes (x, y, z). 25 shows the transformation from four reaction wheel spin directions to body.

This point mass is included in the calculation of the vehicle mass properties and CG. The oscillations are excited by variations in the vehicle acceleration, mainly in Az . The figure shows the sloshing motion in the longitudinal plane but the same principle also applies in lateral. The nonlinear nature of the pendulum constraints the amplitude of the oscillation, where the pendulum angle ???? does not exceed ±90◦ , so this model is suitable for nonlinear, limit-cycle analysis. The tension of the string Ts is a function of total acceleration AT , but it is also affected by the centripetal force due to the angular rate.

The reaction wheels (RW) have a fixed spin axis but the wheel speed can be varied by a torque motor. The MEDs generate torque through angular momentum transfer to and from the main vehicle body. This is achieved either by changing the angular momentum vector direction of the CMG spin axes, or by changing the angular momentum magnitude of the RW. The advantage of MEDs is that, contrary to the on–off jets, they achieve precise control because they operate in a continuous manner, plus they do not consume propellant-only electric power.

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