Control of cryogenic rocket engines or hypergolic engines

Roberto da Silva Rocha, university professor and political scientist

Control of cryogenic rocket engines or hypergolic engines

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It all boils down to one word: feed back. feedback is the control that keeps the engine within parameters designed to control excess heat and pressure and minimum heat and pressure to produce the required thrust, but feedback is always a little late, because tries to fix the engine's performance based on operating information moments after the condition and behavior, for example: first the small excess pressure occurs, then the necessary measure is taken to reduce the pressure, but after the fact, not necessarily immediately, therefore the correction is always delayed, what you can do is to be very fast in the compensation, but this is impossible for three reasons or three possible situations:

a) the performance of the correction of the operating deviation must be in the opposite direction, that is, if some operating parameter has been exceeded, then the action that causes the increase of the action is reduced, decelerating the motor;

b) the action to correct the operating deviation must be in the opposite direction, that is, if it falls short of some operating parameter, then the action increases, which causes a decrease in the action, accelerating the engine;

c) if the compensating action was greater than desired, the motor may decelerate too much, or the motor may accelerate too much, or it may happen that the action is exact in the precise decrease or increase in order to achieve the desired balance with a single attempt .

As one can only know the outcome of the intervention if it was (a) (b) (c) through further feedback.

So we are always late in detecting the deviation or correcting the deviation.

This is the problem with motor control, this oscillation between action and correction has a delay in time, and reducing this time interval between actions gives the quality of the motor's functioning.

I have the ideal solution for this, and I'm going to patent it soon.

Roberto da Silva Rocha, professor universitário e cientista político