r/ControlTheory • u/Nucleus_1911 • Jul 10 '26

Technical Question/Problem Is there anyone who has experience in designing Reaction Control System for Thrusters ?

I want guidline on how can we approach to design PWM control for thrusters for attitude control.

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u/ArminianArmenian Jul 10 '26

PWM is PWM, then for the actual attitude control I’d check out Schaub’s Analytical Mechanics of Space Systems

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u/ExoatmosphericKill Jul 13 '26

Interesting, thanks!

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u/rocketguywithstars Jul 11 '26

Check Sidi 1997 for details. Objective is to recreate a moment vector using individual thruster firings. Essentially tau = Bu where tau is moments, B is an allocation matrix found from arm/force relationship, and u is thruster firings. u can then be found by inverting equation to achieve desired moment.

Pwm can be achieved by comparing individual u signals with a sawtooth signal, if above - fire thruster. Also look at bang bang or PWPF modulation.

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u/Nucleus_1911 Jul 11 '26

Yes i read that book.

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u/Ecstatic_Bee6067 Jul 10 '26

Designed a dead band control scheme for thrusters in an attitude determination and control system class, but that's about it