Aeronautics Astronautics

Download Performance Evaluation and Design of Flight Vehicle Control by Eric T. Falangas PDF

By Eric T. Falangas

The aim of this publication is to aid analysts, engineers, and scholars towards constructing dynamic types, and reading the keep watch over of flight cars with numerous mixed good points comprising plane, release autos, reentry automobiles, missiles and aircraft.

  • Graphical tools for analysing automobile performance
  • Methods for trimming deflections of a automobile that has a number of different types of effectors
  • Presents a parameters used for quickly comparing the functionality, balance, and controllability of a brand new flight automobile notion alongside a trajectory or with mounted flight conditions

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Extra info for Performance Evaluation and Design of Flight Vehicle Control Systems

Example 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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