Point taken. I'll calculate the fundamental frequency of the slosh (using the pendulum model) and see how they compare to the lag time in the control system. If the slosh frequency is much longer, then there is no problem from that direction.
No, it depends on the feedback terms and filtering terms in your control system.
You may be best off modelling the system as a linear electronic filter and then testing it to see if it is stable or unstable. That's how the pros do it I believe.
-p
"No science without fancy, no art without facts" - Vladimir Nabokov
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