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3. Permanent state of operation
We have already encountered two states of motion that play a major practical role: the equilibrium state and the steady state. A third state is also frequently encountered: the steady state.
3.1 Practical impossibility of obtaining a stationary state
In many cases, it would be desirable to obtain a stationary state for the machine, i.e. θ ' = Cte. The general equation of motion shows that this assumption leads to :
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Permanent state of operation
Characterization of speed
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