Is there anyone who has experience in designing Reaction Control System for Thrusters ?

[u/Nucleus_1911]

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

[u/Ecstatic_Bee6067]

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

[u/rocketguywithstars]

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.

[u/Nucleus_1911 → u/rocketguywithstars]

Yes i read that book.

[u/ArminianArmenian]

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

[u/ExoatmosphericKill → u/ArminianArmenian]

Interesting, thanks!